JP2020150759A - Power control device - Google Patents

Abstract

To provide a power control device capable of suppressing a rise of an electricity charge.SOLUTION: A power control device 50 creates a charge/discharge plan for a battery 31 of an electric vehicle 30 corresponding to a power storage device on the basis of a system supply ratio, first charge efficiency, discharge efficiency, and discharge supply ratio. The system supply ratio is a ratio of third system electric energy Ws3 to second system electric energy Ws2. The first charge efficiency is a ratio of charge electric energy Wc to the third system electric energy Ws3. The discharge efficiency is a ratio of a first discharge supply amount Wd1 to discharge electric energy Wd. The discharge supply ratio is a ratio of a second discharge supply amount Wd2 to the first discharge supply amount Wd1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power control device.

Conventionally, as described in Patent Document 1, a power control device for creating a charge / discharge plan of a power storage device arranged in a building is known.

Japanese Unexamined Patent Publication No. 2017-79564

In the charge / discharge plan created by the power control device described in Patent Document 1, the power storage device is charged during the time when the electricity charge is low in the day, and it is necessary during the time when the electricity charge is high during the day. The power storage device is discharged accordingly. However, the charging efficiency and the discharging efficiency of each battery differ depending on the specifications and manufacturing variations of the batteries mounted on the power storage device, so that the amount of system power used for charging the power storage device may increase. This can result in higher electricity prices. Here, the charging efficiency is the ratio of the amount of power charged to the power storage device to the amount of power supplied from the system power source to the power storage device. Further, the discharge efficiency is the ratio of the amount of power supplied to the power consuming equipment of the building to the amount of power generated by the discharge of the power storage device.

For example, when the charging efficiency of the power storage device is low, the ratio of the amount of power charged to the power storage device to the amount of power supplied from the system power source to the power storage device is small, so that the charging efficiency is high as compared with the case where the charging efficiency is high. The amount of system power used to charge the power storage device increases. Therefore, when the charging efficiency of the power storage device is low, the electricity charge is high. Further, when the discharge efficiency of the power storage device is low, the ratio of the amount of power supplied to the power consumption device to the amount of power generated by the discharge of the power storage device is small, so that the power consumption device is compared with the case where the discharge efficiency is high. The amount of discharge power consumed to supplement the power consumption increases. As the amount of discharge power consumed increases, the amount of power used to charge the power storage device increases, so the amount of system power used to charge the power storage device increases. Therefore, when the discharge efficiency of the power storage device is low, the electricity charge is high.

In view of the above points, the present invention is to provide a power control device capable of suppressing an increase in electricity charges.

In order to achieve the above object, the invention according to claim 1 uses power generation prediction data (Dgf), which is a prediction of a transition of the amount of power generated by the power generation device (21) arranged in the building (20). A power generation prediction unit (S102) to be created, and a consumption prediction unit (S103) to create consumption prediction data (Dcf) that predicts changes in the amount of electric energy consumed by the power consumption equipment (24) arranged in the building. , Power generation prediction data, consumption prediction data, charge / discharge device for electric energy (Ws2) supplied from the system power source (11) to the charge / discharge device (40) for charging / discharging the battery (31) of the power storage device (30). The ratio of the electric energy (Wc) charged to the battery to the system supply rate (ηs), which is the ratio of the electric energy (Ws3) supplied to the battery from, and the electric energy (Ws3) supplied from the charging / discharging device to the power storage device. It is a power control device including a plan creation unit (S105) for creating a battery charge / discharge plan (Pcd) based on the charging efficiency (ηc1).

This allows the power controller to create a charge / discharge plan to charge the battery when the grid supply rate and charging efficiency are high. By charging the battery when the grid supply rate and charging efficiency are high, the amount of grid power used to charge the battery is smaller than when the grid supply rate and charging efficiency are low. Therefore, the electric power control device can reduce the electricity charge and suppress the increase in the electricity charge.

Further, in order to achieve the above object, the invention according to claim 6 is power generation prediction data (Dgf) which is a prediction of a transition of the amount of electric energy generated by the power generation device (21) arranged in the building (20). ), And a consumption prediction unit (S103) that creates consumption prediction data (Dcf), which is a prediction of changes in the amount of electric energy consumed by the power consumption device (24) arranged in the building. ), Power generation prediction data, consumption prediction data, and the amount of power supplied from the battery to the charging / discharging device (40) for charging / discharging the battery with respect to the amount of power (Wd) discharged by the battery (31) of the power storage device (30). Discharge supply, which is the ratio of the discharge efficiency (ηd), which is the ratio of (Wd1), and the electric energy (Wd2), which is the ratio of the electric energy (Wd2) supplied from the charge / discharge device to the power consuming device to the electric energy (Wd1) supplied from the battery to the charge / discharge device. It is a power control device including a plan creation unit (S105) for creating a battery charge / discharge plan based on a rate (ηm).

This allows the power controller to create a charge / discharge plan that prohibits battery discharge when the discharge efficiency and discharge supply rate are low. When the discharge efficiency and the discharge supply rate are low, the discharge of the battery is prohibited, so that the amount of discharge power used to make up for the insufficient power amount is suppressed from increasing. Therefore, it is possible to suppress an increase in the amount of system power used for charging according to the amount of discharged power consumed, so that an increase in electricity charges is suppressed.

The reference reference numerals in parentheses attached to each component or the like indicate an example of the correspondence between the component or the like and the specific component or the like described in the embodiment described later.

The block diagram of the power management system using the power control device of this embodiment. The relationship diagram which shows the efficiency map of the power control apparatus of this embodiment. The relationship diagram which shows the time, the power purchase price, and the power sale price used for the power control device of this embodiment. The flowchart for demonstrating the processing of the power control apparatus of this embodiment. The figure which shows the power generation prediction data and consumption prediction data created by the power control apparatus of this embodiment. The figure which shows the charge / discharge plan when the excess / deficiency data and the provisional value created by the power control device of this embodiment are initial values. The figure which shows the charge / discharge plan which set the excess / deficiency data and discharge permission time created by the power control device of this embodiment. The figure for demonstrating the correction of the efficiency map by the power control device of this embodiment. The relationship diagram which shows the efficiency map of the power control device of another embodiment. The figure which shows the charge / discharge plan of the power control apparatus of another embodiment. The figure which shows the charge / discharge plan of the power control apparatus of another embodiment.

The power control device 50 of this embodiment is used in the power management system 100. First, the power management system 100 will be described.

The electric power management system 100 manages the electric power in the house 20 while supplying electric power between the house 20 corresponding to the building and the electric vehicle 30 corresponding to the power storage device via the charging / discharging device 40. Specifically, the power management system 100 includes a grid power source 11, a grid power line 12, a house 20, an electric vehicle 30, a charging / discharging device 40, a weather server 45, a communication network 46, a power control device 50, and an information server 60. ..

The house 20 includes a power generation device 21, a home power line 22, a distribution board 23, a power consumption device 24, a grid watt hour meter 25, a watt hour meter 26, a watt-hour meter 27 on the house side, a discharge meter 28 on the house side, and equipment power. It is equipped with a watt-hour meter 29.

The power generation device 21 is, for example, a solar power generation device and is arranged on the roof of the house 20. The power generation device 21 converts the energy of sunlight into electric power. The electric power converted by the power generation device 21 is supplied to the distribution board 23 via the in-house power line 22.

The distribution board 23 receives power transmitted from the grid power source 11 via the grid power line 12 and power transmitted from the power generation device 21 via the home power line 22. Then, the distribution board 23 supplies the electric power supplied from the system power source 11 and the power generation device 21 to the power consumption device 24 and the charging / discharging device 40 described later via the in-house power line 22. Further, the distribution board 23 supplies the electric power supplied from the battery 31 of the electric vehicle 30 described later via the charging / discharging device 40 to the power consuming device 24 via the in-house power line 22.

The power consuming device 24 is, for example, an air conditioner, a refrigerator, a hot water supply device, or the like, and operates by electric power from the distribution board 23.

The grid watt-hour meter 25, the generated watt-hour meter 26, the residential-side charge watt-hour meter 27, the residential-side discharge watt-hour meter 28, and the equipment watt-hour meter 29 are arranged in the distribution board 23. The grid watt hour meter 25 measures the amount of power supplied from the grid power source 11 to the distribution board 23 via the grid power line 12. The generated power meter 26 measures the amount of power supplied from the power generation device 21 to the distribution board 23 via the in-house power line 22. The residential charge meter 27 measures the amount of electric power supplied from the distribution board 23 to the charging / discharging device 40 via the in-house power line 22. The residential discharge meter 28 measures the amount of electric power supplied from the charging / discharging device 40 to the distribution board 23 via the in-house power line 22. The watt hour meter 29 measures the amount of power supplied from the distribution board 23 to the power consuming device 24 via the in-house power line 22.

The electric vehicle 30 includes a battery 31, a battery temperature sensor 32, a battery control unit 33, and the like.

The battery 31 is a rechargeable / dischargeable secondary battery, for example, a nickel hydrogen battery or a lithium ion battery. The battery 31 is used in a motor for rotating wheels of an electric vehicle 30 (not shown), and the capacity of the battery 31 is relatively large.

The battery temperature sensor 32 outputs a detection signal corresponding to the battery temperature Tb of the battery 31 to the battery control unit 33.

The battery control unit 33 is mainly composed of a microcomputer or the like, and includes a CPU, a ROM, a RAM, an I / O, a bus line for connecting these configurations, and the like. In addition, the battery control unit 33 includes an interface for communicating with the charging / discharging device 40 described later. Further, the ROM of the battery control unit 33 stores the program executed by the battery control unit 33, the vehicle identification number ID of the electric vehicle 30, and the vehicle type of the electric vehicle 30.

Further, when the battery control unit 33 executes the program stored in the ROM, the battery control unit 33 monitors the battery 31 by estimating the remaining battery SOC of the battery 31. For example, the battery control unit 33 estimates the remaining battery SOC based on the open circuit voltage OCV of the battery 31 measured by a voltage measuring device (not shown). Then, the battery control unit 33 calculates the charging electric energy Wc and the discharging electric energy Wd based on the estimated change in the remaining battery SOC. The charging power amount Wc is the amount of power charged to the battery 31, and is the amount of increase in the remaining battery SOC when the power is supplied to the battery 31. The discharge power amount Wd is the amount of power generated by the discharge of the battery 31, and is the amount of decrease in the remaining battery SOC when the battery 31 is discharged.

The charging / discharging device 40 is arranged outside the house 20 and charges / discharges the battery 31 of the electric vehicle 30. Specifically, the charge / discharge device 40 includes a charge / discharge cable 41, a device-side charge meter 42, a device-side discharge meter 43, and a charge / discharge control unit 44. In addition, here, charge / discharge indicates both charging and discharging.

The charge / discharge cable 41 is connected to an inlet of an electric vehicle 30 (not shown), and is a power line for transmitting / receiving power to / from the battery 31 and a communication line for communicating between the battery control unit 33 and the charge / discharge control unit 44. And have.

The device-side charge meter 42 and the device-side discharge meter 43 are arranged in the charge / discharge device 40. The device-side charge meter 42 measures the amount of power supplied from the charge / discharge device 40 to the battery 31 via the charge / discharge cable 41. The device-side discharge meter 43 measures the amount of power supplied from the battery 31 to the charge / discharge device 40 via the charge / discharge cable 41.

The charge / discharge control unit 44 is mainly composed of a microcomputer or the like, and includes a CPU, a ROM, a RAM, an I / O, a bus line for connecting these configurations, and the like. Further, the charge / discharge control unit 44 includes an interface for communicating with the battery control unit 33.

Further, when the charge / discharge control unit 44 executes the program stored in the ROM, the charge / discharge control unit 44 acquires the electric energy measured by the device-side charge meter 42 and the device-side discharge meter 43. Further, the charge / discharge control unit 44 acquires the vehicle identification number ID, the vehicle type, the remaining battery SOC, the charge power amount Wc, the discharge power amount Wd, and the battery temperature Tb from the battery control unit 33 via the charge / discharge cable 41. ..

The meteorological server 45 creates meteorological forecast data Dwf, which is a forecast of changes in the weather, the amount of sunshine, and the like for each predetermined period. The created weather prediction data Dwf is transmitted to the power control device 50 via the communication network 46.

The power control device 50 is arranged in the house 20. The power control device 50 is mainly composed of a microcomputer or the like, and includes a CPU, a ROM, a RAM, an I / O, a bus line for connecting these configurations, and the like. Further, the power control device 50 includes an interface for communicating with the grid watt-hour meter 25, the generated watt-hour meter 26, the residential-side watt-hour meter 27, the residential-side watt-hour meter 28, and the equipment watt-hour meter 29. Further, the power control device 50 includes an interface for communicating with the charge / discharge control unit 44 and an interface for communicating with the weather server 45 and the information server 60 described later via the communication network 46.

Specifically, the power control device 50 includes a power generation prediction unit 51, a consumption prediction unit 52, an excess / deficiency prediction unit 53, a planning creation unit 54, and a power control unit 55 as functional control blocks. Further, the power control device 50 has an actual efficiency calculation unit 56, a charge correction unit, a discharge correction unit, and a map creation unit 57 corresponding to the supply correction unit.

The power generation prediction unit 51 predicts the transition of the amount of power generated by the power generation device 21 at predetermined intervals based on the weather prediction data Dwf acquired from the weather server 45 via the communication network 46. To create.

The consumption prediction unit 52 creates consumption prediction data Dcf, which is a prediction of the transition of the amount of power consumed by the power consumption device 24 at predetermined intervals.

The excess / deficiency prediction unit 53 creates excess / deficiency data Ded, which is a prediction of the transition of the shortage of the amount of power generated by the power generation device 21 for each predetermined period, based on the power generation prediction data Dgf and the consumption prediction data Dcf. ..

The planning unit 54 plans to charge / discharge the battery 31 based on the remaining battery SOC of the battery 31, excess / deficiency data Ded, efficiency map Me, power purchase price Cp and power sale price Cs described later. Create a plan Pcd. In addition, the plan creation unit 54 creates a charge / discharge plan Pcd that reduces the electricity rate. Details of the creation of this charge / discharge plan Pcd will be described later.

The power control unit 55 transmits a signal for charging / discharging the battery 31 to the charge / discharge control unit 44 according to the charge / discharge plan Pcd. Based on the signal transmitted from the power control unit 55, the charge / discharge control unit 44 charges / discharges the battery 31 according to the charge / discharge plan Pcd created by the plan creation unit 54.

The actual efficiency calculation unit 56 includes a grid watt-hour meter 25, a generated watt-hour meter 26, a residential-side charge meter 27, a residential-side discharge meter 28, an equipment power meter 29, a device-side charge meter 42, and a device-side discharge meter. Each power efficiency is calculated based on the amount of power measured by the total 43.

The map creation unit 57 corrects the efficiency map Me, which is the relationship between each electric energy and each electric power efficiency. Then, the map creation unit 57 associates the corrected efficiency map Me with the vehicle identification number ID and the vehicle type of the electric vehicle 30 and transmits the corrected efficiency map Me to the information server 60 described later via the communication network 46. The details of each power efficiency, efficiency map Me, and correction of the efficiency map Me will be described later.

The information server 60 stores the efficiency map Me acquired from the power control device 50 via the communication network 46.

As described above, the power management system 100 is configured. Next, in order to explain the creation of the charge / discharge plan Pcd for reducing the electricity charge by the power control device 50, the details of each power efficiency and efficiency map Me will be described.

Here, for convenience, the terms are defined as follows for convenience. The amount of power measured by the power generation meter 26 and supplied from the power generation device 21 to the distribution board 23 via the in-house power line 22 is defined as the power generation amount Wg. Of the generated electric energy Wg, the amount of surplus electric power when the electric power generated by the power generation device 21 is used for the power consuming device 24 is defined as the surplus electric energy We. Of the surplus electric energy We, the electric energy to be sold is defined as the first surplus electric energy We1. Of the surplus electric energy We measured by the residential electric energy meter 27, the electric energy supplied from the distribution board 23 to the charging / discharging device 40 via the in-house electric energy line 22 is defined as the second surplus electric energy We2. Of the second surplus electric energy We2 measured by the device-side charge meter 42, the amount of electric power supplied from the charge / discharge device 40 to the battery 31 via the charge / discharge cable 41 is defined as the third surplus electric energy We3.

Further, the amount of electric power that is insufficient when the electric power generated by the power generation device 21 is used for the power consuming device 24 is defined as the insufficient electric energy Wi. The amount of power supplied from the grid power source 11 to the distribution board 23 via the grid power line 12 is defined as the grid power amount Ws. Of the grid electric energy Ws, the electric energy supplied from the distribution board 23 to the power consuming device 24 via the home power line 22 is defined as the first system electric energy Ws1. Of the system electric energy Ws, the amount of electric power supplied from the distribution board 23 to the charging / discharging device 40 via the in-house electric energy line 22 is defined as the second system electric energy Ws2. Of the second system electric energy Ws2, the amount of electric power supplied from the charging / discharging device 40 to the battery 31 via the charging / discharging cable 41 is defined as the third system electric energy Ws3.

Further, of the discharge electric energy Wd, the electric energy supplied from the battery 31 to the charge / discharge device 40 via the charge / discharge cable 41 is defined as the first discharge supply amount Wd1. Of the first discharge supply amount Wd1, the amount of power supplied from the charging / discharging device 40 to the distribution board 23 via the in-house power line 22 is defined as the second discharge supply amount Wd2. Of the second discharge supply amount Wd2, the amount of power supplied from the distribution board 23 to the power consuming device 24 via the in-house power line 22 is defined as the third discharge supply amount Wd3. Here, the power control device 50 considers the power loss due to the distribution board 23 to be zero. As a result, the power control device 50 considers the second discharge supply amount Wd2 to be equal to the third discharge supply amount Wd3. Further, in FIG. 1, in order to clarify each electric energy, each flow of electric power from the grid power source 11 is indicated by a solid arrow. Further, each flow of electric power from the power generation device 21 is described by a broken line. Further, each flow of electric power from the battery 31 is described by a dashed line.

Further, the ratio of the third system electric energy Ws3 to the second system electric energy Ws2 is defined as the system supply rate ηs. The ratio of the third surplus electric energy We3 to the second surplus electric energy We2 is defined as the power generation supply rate ηg. The ratio of the charging electric energy Wc to the third system electric energy Ws3 is defined as the first charging efficiency ηc1 of the battery 31. The ratio of the charging electric energy Wc to the third surplus electric energy We3 is defined as the second charging efficiency ηc2 of the battery 31. The ratio of the first discharge supply amount Wd1 to the discharge power amount Wd is defined as the discharge efficiency ηd of the battery 31. The ratio of the second discharge supply amount Wd2 to the first discharge supply amount Wd1 is defined as the discharge supply rate ηm.

The power efficiencies are the system supply rate ηs, the power generation supply rate ηg, the first charge efficiency ηc1, the second charge efficiency ηc2, the discharge efficiency ηd, and the discharge supply rate ηm, respectively, according to the following relational expression (1-1). It is expressed as − (1-6).

ηs = Ws3 / Ws2 ... (1-1)
ηg = We3 / We2 ... (1-2)
ηc1 = Wc / Ws3 ... (1-3)
ηc2 = Wc / We3 ... (1-4)
ηd = Wd1 / Wd ・ ・ ・ (1-5)
ηm = Wd2 / Wd1 ... (1-6)

Further, as shown in FIG. 2, the efficiency map Me is the corresponding electric energy and system supply rate ηs, power generation supply rate ηg, first charge efficiency ηc1, second charge efficiency ηc2, discharge efficiency ηd, and discharge supply rate ηm. It is each relationship diagram with.

Here, as shown in FIG. 2, as the electric energy corresponding to the system supply rate ηs, that is, the second system electric energy Ws2 increases, the system supply rate ηs increases. As the amount of electric power corresponding to the power generation supply rate ηg, that is, the second surplus electric energy We2 increases, the power generation supply rate ηg increases. As the electric energy corresponding to the first charging efficiency ηc1, that is, the third system electric energy Ws3 increases, the first charging efficiency ηc1 increases. The second charging efficiency ηc2 increases as the electric energy corresponding to the second charging efficiency ηc2, that is, the third surplus electric energy We3 increases. As the electric energy corresponding to the discharge efficiency ηd, that is, the discharge electric energy Wd increases, the discharge efficiency ηd increases. As the amount of electric power corresponding to the discharge supply rate ηm, that is, the first discharge supply amount Wd1, increases, the discharge supply rate ηm increases. Further, the first charging efficiency ηc1 and the second charging efficiency ηc2 are the efficiencies of the electric power exchanged between the electric vehicle 30 and the charging / discharging device 40, respectively, and thus have the same relationship with each other. Further, the discharge efficiency ηd has the same relationship as the first charge efficiency ηc1 and the second charge efficiency ηc2. Further, the system supply rate ηs, the power generation supply rate ηg, and the discharge supply rate ηm are the efficiencies of the electric power transferred and received between the distribution board 23 and the charging / discharging device 40, respectively, and thus have the same relationship with each other. ..

Further, in the efficiency map Me, the system supply rate ηs is indicated by a function of the second system electric energy Ws2. The power generation supply rate ηg is indicated by a function of the second surplus electric energy We2. The first charge efficiency ηc1 is indicated by a function of the third system electric energy Ws3. The second charging efficiency ηc2 is indicated by a function of the third surplus electric energy We3. The discharge efficiency ηd is indicated by a function of the discharge electric energy Wd. The discharge supply rate ηm is indicated by a function of the first discharge supply amount Wd1.

As described above, in the power control device 50, in order to create the charge / discharge plan Pcd, the system supply rate ηs, the power generation supply rate ηg, the first charge efficiency ηc1, the second charge efficiency ηc2, the discharge efficiency ηd, and the discharge supply rate ηm and efficiency map Me are used. Next, in order to explain the creation of the charge / discharge plan Pcd for reducing the electricity charge by the power control device 50, the calculation of the electricity charge will be described.

First, in order to calculate the electricity rate, the power purchase price Cp and the power sale price Cs will be described. Here, the power purchase price Cp is a price per unit electric energy when the electric power transmitted from the grid power source 11 is used. The electric power selling price Cs is a price per unit electric energy when the surplus electric power of the power generation device 21 is purchased by an electric power company or the like. The power purchase price Cp and the power sale price Cs are set as shown in FIG. 3, for example. In FIG. 3, the power purchase price Cp is shown by a solid line, and the power sale price Cs is shown by a alternate long and short dash line.

As shown in FIG. 3, the electricity purchase price Cp is the cheapest in the time zone from 0:00 to 7:00 of the day. In addition, the power purchase price Cp is the highest during the time period from 7:00 to 17:00 of the day. Furthermore, the power purchase price Cp is higher than the power purchase price Cp during the time period from 17:00 to 24:00 of the day and from 0:00 to 7:00 of the day, and is 7:00. The price is lower than the electricity purchase price Cp in the time zone from 17:00 to 17:00.
The selling price Cs is higher than the power buying price Cp in the time zone from 17:00 to 24:00 and cheaper than the time zone from 7:00 to 17:00, and is uniform. Hereinafter, for convenience, the time zone from 0:00 to 7:00 of the day will be appropriately described as the cheapest time zone TM_min. Further, in the figure, the time zone from 7:00 to 17:00 of the day is described as the maximum time zone TM_max. Further, in the figure, the time zone from 0:00 to 24:00 in the day is described as the intermediate time zone TM_mid.

Then, the calculation of the electricity charge will be described. Here, the electricity rate is a rate that considers both the rate obtained by selling electricity and the rate paid to the electric power company by purchasing electricity. For example, the electricity rate is calculated by subtracting the rate obtained by selling electricity from the rate paid to the electric power company by purchasing electricity.

First, the charge obtained by selling electricity is calculated, for example, by multiplying the surplus electric energy We sold, that is, the first surplus electric energy We1 by the electricity selling price Cs.

Here, assuming that the ratio of the amount of electricity sold to the surplus electric energy We is the electric energy selling ratio α, the surplus electric energy We, the first surplus electric energy We1 and the electric energy selling ratio α are expressed by the following relational expression (2-1). It is expressed as.

Therefore, assuming that the charge obtained by selling electricity is Fs, the charge obtained by selling electricity is the charge obtained by multiplying the first surplus electric energy We1 by the selling price Cs. Therefore, the electricity selling ratio α, the surplus electric energy We, and It is expressed as the following relational expression (2-2) using the selling price Cs.

We1 = α × We ・ ・ ・ (2-1)
Fs = We1 × Cs
= Α × We × Cs ・ ・ ・ (2-2)

Next, the charge paid to the electric power company by the electric power purchase is calculated by, for example, multiplying the system electric energy Ws used by the electric power purchase price Cp. Here, the system power amount Ws used is the sum of the first system power amount Ws1 and the second system power amount Ws2. As described above, the first system electric energy Ws1 is the amount of electric energy supplied from the distribution board 23 to the power consuming device 24 via the home power line 22 in the system electric energy Ws. The second system electric energy Ws2 is the amount of electric energy supplied from the distribution board 23 to the charging / discharging device 40 via the home power line 22 in the system electric energy Ws.

Further, as shown in FIG. 1, the first system electric energy Ws1 is used together with the third discharge supply amount Wd3 to supplement the insufficient electric energy Wi. As described above, the third discharge supply amount Wd3 is the amount of power supplied from the distribution board 23 to the power consuming device 24 via the in-house power line 22. Further, since the power control device 50 considers the power loss due to the distribution board 23 to be zero, it considers the third discharge supply amount Wd3 to be equal to the second discharge supply amount Wd2.

Therefore, the first system electric energy Ws1 is calculated by subtracting the third discharge supply amount Wd3 from the insufficient electric energy Wi, that is, subtracting the second discharge supply amount Wd2 from the insufficient electric energy Wi.

Further, the second discharge supply amount Wd2 is, as described above, the amount of power supplied from the charging / discharging device 40 to the distribution board 23 via the home power line 22 in the first discharge supply amount Wd1. Further, the first discharge supply amount Wd1 is the amount of power supplied from the battery 31 to the charge / discharge device 40 via the charge / discharge cable 41.

Further, when the discharge power of the battery 31 is supplied to the charge / discharge device 40 via the charge / discharge cable 41, power loss occurs due to the electric vehicle 30 and the charge / discharge device 40. Further, the electric power supplied from the charging / discharging device 40 to the distribution board 23 via the in-house power line 22 causes a power loss due to the charging / discharging device 40.

Therefore, the second discharge supply amount Wd2 is calculated by multiplying the discharge power amount Wd by the discharge efficiency ηd and the discharge supply rate ηm. Therefore, the second discharge supply amount Wd2 is expressed by the following relational expression (2-3).

Therefore, the first system electric energy Ws1 is calculated by subtracting the second discharge supply amount Wd2 from the insufficient electric energy Wi, and is therefore expressed as the following relational expression (2-4).

Wd2 = Wd × ηd × ηm ・ ・ ・ (2-3)
Ws1 = Wi-Wd2
= Wi-Wd x ηd x ηm ... (2-4)

The second system electric energy Ws2 is used together with the second surplus electric energy We2 to charge the battery 31 with respect to the first system electric energy Ws1. Therefore, the sum of the electric energy charged to the battery 31 in the second system electric energy Ws2 and the electric energy charged to the battery 31 in the second surplus electric energy We2 is the charging electric energy Wc. As described above, the second surplus electric energy We2 is the amount of electric energy supplied from the distribution board 23 to the charging / discharging device 40 via the in-house electric power line 22 in the surplus electric energy We. Further, the second surplus electric energy We2 is expressed by the following relational expression (2-5) when the power selling ratio α and the surplus electric energy We2 are used.

Further, when the electric power from the system power source 11 is supplied to the charging / discharging device 40 via the in-house power line 22 and the distribution board 23, a power loss due to the charging / discharging device 40 occurs. Further, when power is supplied from the charging / discharging device 40 to the battery 31 via the charging / discharging cable 41 and the battery 31 is charged, power loss occurs in the electric vehicle 30 and the charging / discharging device 40.

Therefore, of the second system electric energy Ws2, the amount of electric energy charged to the battery 31 is calculated by multiplying the second system electric energy Ws2 by the system supply rate ηs and the charging efficiency ηc. Therefore, of the second system electric energy Ws2, the electric energy charged to the battery 31 is expressed by the following relational expression (2-6). In the relational expression, the electric energy charged to the battery 31 in the second system electric energy Ws2 is described as Wc1.

Further, when the surplus power from the power generation device 21 is supplied to the charge / discharge device 40 via the in-house power line 22 and the distribution board 23, a power loss due to the charge / discharge device 40 occurs. Further, when power is supplied from the charging / discharging device 40 to the battery 31 via the charging / discharging cable 41 and the battery 31 is charged, power loss occurs in the electric vehicle 30 and the charging / discharging device 40.

Therefore, of the second surplus electric energy We2, the amount of electric energy charged to the battery 31 is calculated by multiplying the second surplus electric energy We2 by the power generation supply rate ηg and the charging efficiency ηc. As a result, of the second surplus electric energy We2, the electric energy charged to the battery 31 is expressed by the following relational expression (2-7). In the relational expression, of the second surplus electric energy We2, the electric energy charged to the battery 31 is described as Wc2.

Therefore, since the charging electric energy Wc is the sum of Wc1 and Wc2, it is expressed as the following relational expression (2-8). As a result, the second system electric energy Ws2 is expressed by the following relational expression (2-9).

We2 = (1-α) × We ・ ・ ・ (2-5)
Wc1 = Ws2 x ηs x ηc1 ... (2-6)
Wc2 = We2 x ηg x ηc2 ... (2-7)
Wc = Wc1 + Wc2
= Ws2 x ηs x ηc1 + We2 x ηg x ηc2 ... (2-8)
Ws2 = (Wc-We2 x ηg x ηc2) / (ηs x ηc1)
... (2-9)

As described above, the first system electric energy Ws1 and the second system electric energy Ws2 are calculated. Then, the charge paid to the electric power company by the power purchase is calculated by multiplying the sum of the first system electric energy Ws1 and the second system electric energy Ws2 by the power purchase price Cp. Therefore, the following relational expression (2- It is expressed as 10). Further, the second surplus electric energy We2 represented by the relational expression (2-10) is represented by the power selling ratio α and the surplus electric energy We2 using the above relational expression (2-5). Therefore, the charge paid to the electric power company by purchasing electricity is expressed by the following relational expression (2-11) using the electricity selling ratio α and the surplus electric energy We. In the relational expression, the charge paid to the electric power company by purchasing electricity is defined as Fc.

Fc = (Ws1 + Ws2) x Cp
= ((Wi-Wd x ηd x ηm)
+ (Wc-We2 x ηg x ηc2) / (ηs x ηc1)) x Cp
... (2-10)
Fc = ((Wi-Wd x ηd x ηm))
+ (Wc− (1-α) × We × ηg × ηc2) / (ηs × ηc1)) × Cp
... (2-11)

Therefore, the electricity charge is calculated by subtracting the charge obtained by selling the electricity from the charge paid to the electric power company by purchasing the electricity. Therefore, the above relational expressions (2-2) and (2-11) are used. It is expressed as the relational expression (2-12) below. As a result, the electricity charge is calculated based on the shortage electric energy Wi, the discharge electric energy Wd, the charging electric energy Wc, the surplus electric energy We, the electricity selling ratio α, the electricity buying price Cp, and the electricity selling price Cs. The electricity charge is calculated based on the system supply rate ηs, the power generation supply rate ηg, the first charge efficiency ηc1, the second charge efficiency ηc2, the discharge efficiency ηd, and the discharge supply rate ηm. In the relational expression (2-12), FT represents an electricity charge.

FT = Fc-Fs
= ((Wi-Wd x ηd x ηm)
+ (Wc− (1-α) × We × ηg × ηc2) / (ηs × ηc1)) × Cp
−α × We × Cs ・ ・ ・ (2-12)

As described above, the electricity rate is calculated as an example. Then, with reference to the flowchart of FIG. 4 and the relationship diagram of FIGS. 5 to 8, the creation of the charge / discharge plan Pcd for reducing the electricity charge by the power control device 50 and the correction of the efficiency map Me will be described.

In step S101, the power control device 50 acquires the weather prediction data Dwf and the vehicle information, and reads out the efficiency map Me corresponding to the acquired vehicle information. Specifically, the power control device 50 acquires the weather prediction data Dwf from the weather server 45 via the communication network 46. Further, the charge / discharge control unit 44 acquires vehicle information of the electric vehicle 30 connected to the charge / discharge cable 41 from the battery control unit 33 via the charge / discharge cable 41. The power control device 50 acquires the vehicle information stored in the charge / discharge control unit 44, and reads out the efficiency map Me corresponding to the acquired vehicle information. Here, the vehicle information is the vehicle identification number ID of the electric vehicle 30, the vehicle type, and the remaining battery SOC of the battery 31.

Subsequently, in step S102, the power control device 50 creates power generation prediction data Dgf for each predetermined period based on the weather prediction data Dwf. Specifically, the power control device 50 has power generation prediction data for each predetermined period based on the amount of sunshine for each predetermined period and power generation performance such as energy conversion efficiency of the power generation device 21 shown in the weather prediction data Dwf. Create Dgf. Here, as shown in FIG. 5, in the time zone from 7:00 to 17:00, the power generation device 21 generates power when sunlight hits the power generation device 21, and the generated electric energy Wg is generated. Here, the predetermined period is a period in which one day is divided every 30 minutes. Further, in the power generation prediction data Dgf of FIG. 5, the direction of the arrow on the vertical axis indicating the generated power amount Wg is set to the positive direction.

Subsequently, in step S103, the power control device 50 obtains consumption prediction data Dcf for each predetermined period based on the amount of power measured by the watt hour meter 29, that is, the amount of power consumed by the power consuming device 24. create. Specifically, the power control device 50 creates consumption prediction data Dcf using the transition of the amount of power consumed by the past power consumption device 24 and the autoregressive model. Here, as shown in FIG. 5, the power consuming device 24 consumes the user in the house 20 during the time zone from 0:00 to 6:00 and the time zone from 21:00 to 24:00 when the user is sleeping. The power consumption Wm, which is the planned power consumption, is relatively small. In addition, the power consumption Wm is relatively large during the time period from 6:00 to 21:00 when the user of the house 20 is active. In the consumption prediction data Dcf of FIG. 5, the direction of the arrow on the vertical axis indicating the power consumption Wm is the positive direction.

Subsequently, in step S104, the power control device 50 creates excess / deficiency data Ded for each predetermined period based on the power generation prediction data Dgf and the consumption prediction data Dcf. Specifically, the excess / deficiency prediction unit 53 creates excess / deficiency data Ded by subtracting the power generation prediction data Dgf from the consumption forecast data Dcf. For example, in the period in which the value obtained by subtracting the generated power amount Wg from the power consumption amount Wm in the corresponding predetermined period is a positive value, the power consumption amount Wm is large, so that the generated power amount Wg is insufficient. As a result, the insufficient electric energy Wi, which is the insufficient electric energy, is generated. Further, in the period in which the value obtained by subtracting the generated power amount Wg from the power consumption amount Wm in the corresponding predetermined period is a negative value, the generated power amount Wg is large, so that the generated power amount Wg is surplus. As a result, the surplus electric energy We, which is the surplus electric energy of the generated electric energy Wg, is generated. Here, as shown in FIGS. 6 and 7, the power control device 50 creates excess / deficiency data Ded by subtracting the power generation prediction data Dgf of FIG. 5 from the consumption prediction data Dcf of FIG. In the excess / deficiency data Ded of FIGS. 6 and 7, the direction of the “+” arrow is the positive direction, and the vertical axis on the “+” side indicates the insufficient power amount Wi. Further, the direction of the "-" arrow is the negative direction, and the vertical axis on the "-" side indicates the surplus electric energy We. Further, for the following explanation of the charge / discharge plan Pcd, the same excess / deficiency data Ded is shown in FIGS. 6 and 7.

Subsequently, in the loop L1, the power control device 50 sets a temporary value A, which is a variable indicating a temporary time when the battery 31 is fully charged, and repeats the processes from step S105 to step S107. Here, the initial value of the provisional value A is set to the end time of the lowest time zone TM_min, which is the time zone where the power purchase price Cp is the cheapest.

Specifically, in step S105 of the loop L1, the power control device 50 creates a charge / discharge plan Pcd corresponding to the current temporary value A. At this time, the power control device 50 creates a charge / discharge plan Pcd for charging the battery 31 and discharging the battery 31 after the provisional value A so that the electricity charge is reduced.

For example, when the provisional value A is the initial value, the time when the battery 31 is fully charged is set at 7 o'clock, which is the end time of the lowest time zone TM_min. At this time, since the surplus electric energy We is not generated in the time zone from 0:00 to 7:00, the power control device 50 charges the battery 31 only with the electric power from the system power source 11 as shown in FIG. Create a charge / discharge plan Pcd. In the charge / discharge plan Pcd, the direction of the “+” arrow is the positive direction, and the vertical axis on the “+” side indicates the amount of charging power Wc to be charged to the battery 31. Further, the direction of the "-" arrow is the negative direction, and the vertical axis on the "-" side indicates the amount of discharge power Wd that is planned to be generated by discharging the battery 31.

Subsequently, in step S106, the power control device 50 calculates the daily electricity charge for charging / discharging the battery 31 according to the charge / discharge plan Pcd when the temporary value A is set. Specifically, the power control device 50 calculates the daily electricity charge by integrating the electricity charges for each predetermined period based on the above relational expression (2-12). The electricity charge for each predetermined period is calculated based on the power purchase price Cp, the power sale price Cs, the insufficient power amount Wi, the surplus power amount We, the charge power amount Wc, and the discharge power amount Wd for each predetermined period. The electricity charges for each predetermined period are the first charge efficiency ηc1, system supply rate ηs, second charge efficiency ηc2, power generation supply rate ηg, discharge efficiency ηd, discharge supply rate ηm, and power sale ratio α for each predetermined period. Calculated based on. Hereinafter, the calculation of each electric energy and each electric power efficiency for each predetermined period when the charge / discharge plan Pcd is planned will be described.

The shortage electric energy Wi and the surplus electric energy We for each predetermined period are calculated by referring to the excess / deficiency data Ded.

The charging electric energy Wc and the discharging electric energy Wd for each predetermined period are calculated by referring to the charge / discharge plan Pcd.

The first charging efficiency ηc1 is a value obtained by dividing the charging electric energy Wc by the third system electric energy Ws3 as represented by the above relational expression (1-3). Further, the first charging efficiency ηc1 is represented by a function of the third system electric energy Ws3 based on the efficiency map Me read in step S101. Therefore, the third system electric energy Ws3 is represented by the charging electric energy Wc as shown in the following relational expression (3-1). As a result, the third system electric energy Ws3 is calculated using the charging electric energy Wc shown in the charge / discharge plan Pcd. Therefore, the first charging efficiency ηc1 is calculated by dividing the charging electric energy Wc indicated by the charge / discharge plan Pcd by the calculated third system electric energy Ws3. In the following relational expression, "f" indicates a function.

ηc1 = Wc / Ws3
= F (Ws3)
Wc = Ws3 × f (Ws3) ・ ・ ・ (3-1)

The system supply rate ηs is a value obtained by dividing the third system electric energy Ws3 by the second system electric energy Ws2, as represented by the above relational expression (1-1). Further, the system supply rate ηs is represented by a function of the second system electric energy Ws2 based on the efficiency map Me read in step S101. Therefore, the second system electric energy Ws2 is represented by the third system electric energy Ws3 as shown in the following relational expression (3-2). As a result, the second system electric energy Ws2 is calculated using the third system electric energy Ws3 calculated as described above. Therefore, the system supply rate ηs is calculated by dividing the calculated third system electric energy Ws3 by the second system electric energy Ws2.

ηs = Ws3 / Ws2
= F (Ws2)
Ws3 = Ws2 × f (Ws2) ・ ・ ・ (3-2)

The second charging efficiency ηc2 is a value obtained by dividing the charging electric energy Wc by the third surplus electric energy We3, as represented by the above relational expression (1-4). Further, the second charging efficiency ηc2 is represented by a function of the third surplus electric energy We3 based on the efficiency map Me read in step S101. Therefore, the third surplus electric energy We3 is represented by the charging electric energy Wc as shown in the following relational expression (3-3). As a result, the third surplus electric energy We3 is calculated using the charging electric energy Wc shown in the charge / discharge plan Pcd. Therefore, the second charging efficiency ηc2 is calculated by dividing the charging electric energy Wc indicated by the charge / discharge plan Pcd by the calculated third surplus electric energy We3.

ηc2 = Wc / We3
= F (We3)
Wc = We3 × f (We3) ・ ・ ・ (3-3)

The power generation supply rate ηg is a value obtained by dividing the third surplus electric energy We3 by the second surplus electric energy We2, as represented by the above relational expression (1-2). Further, the power generation supply rate ηg is represented by a function of the second surplus electric energy We2 based on the efficiency map Me read in step S101. Therefore, the second surplus electric energy We2 is represented by the third surplus electric energy We3 as shown in the following relational expression (3-4). As a result, the second surplus electric energy We2 is calculated using the third surplus electric energy We3 calculated as described above. Therefore, the power generation supply rate ηg is calculated by dividing the calculated third surplus electric energy We3 by the second surplus electric energy We2.

ηg = We3 / We2
= F (We2)
We3 = We2 × f (We2) ・ ・ ・ (3-4)

The discharge efficiency ηd is represented by a function of the discharge electric energy Wd based on the efficiency map Me read in step S101 as in the following relational expression (3-5). As a result, the discharge efficiency ηd is calculated using the discharge electric energy Wd shown in the charge / discharge plan Pcd.

ηd = f (Wd) ・ ・ ・ (3-5)

The discharge supply rate ηm is represented by a function of the first discharge supply amount Wd1 based on the efficiency map Me read in step S101 as in the following relational expression (3-6). Further, the discharge efficiency ηd is a value obtained by dividing the first discharge supply amount Wd1 by the discharge power amount Wd, as represented by the above relational expression (1-5). Therefore, the first discharge supply amount Wd1 is calculated by multiplying the discharge power amount Wd shown in the charge / discharge plan Pcd by the discharge efficiency ηd calculated as described above. Therefore, the discharge supply rate ηm is calculated using the calculated first discharge supply amount Wd1.

ηm = f (Wd1) ・ ・ ・ (3-6)

The power selling ratio α is calculated based on the provisional value A and the surplus electric energy We. For example, when the temporary value A is the initial value, the surplus electric energy We is not used to charge the battery 31, so the power selling ratio α is 1.

Further, the power selling ratio α is the first surplus electric energy We1 with respect to the surplus electric energy We1 as represented by the above relational expression (2-1). Then, among the surplus electric energy We, the first surplus electric energy We1 which is the electric energy to be sold is calculated by subtracting the second surplus electric energy We2 calculated as described above from the surplus electric energy We. Will be done. Therefore, the power selling ratio α is calculated by dividing the calculated first surplus electric energy We1 by the surplus electric energy We. When the first surplus electric energy We1 is zero or less, the electric power control device 50 cannot sell the surplus electric power, so that the electric power selling ratio α is regarded as zero.

In this way, the power control device 50 calculates the electricity charge for each predetermined period by calculating each electric energy, each power efficiency, power purchase price Cp, power sale price Cs, and power sale ratio α for each predetermined period. To do. Then, the power control device 50 integrates the electricity charges for each predetermined period and calculates the daily electricity charges.

After the electricity charge is calculated in step S106, in step S107, the power control device 50 sets a value obtained by adding the predetermined time Δt to the current temporary value A as the new temporary value A. Then, the process returns to step S105. Here, the predetermined time Δt is set to 30 minutes.

Returning to step S105, the power control device 50 creates the current temporary value A, that is, the charge / discharge plan Pcd corresponding to the temporary value A set in the immediately preceding step S107. When the temporary value A changes from the initial value, the power control device 50 creates a charge / discharge plan Pcd for charging the battery 31 by using the surplus electric energy We when the surplus electric energy We is generated. .. Therefore, the power control device 50 creates a charge / discharge plan Pcd in which the charging start time of the battery 31 and the charging electric energy Wc are adjusted.

Subsequently, in step S106, the power control device 50 charges and discharges the battery 31 according to the current temporary value A, that is, the charge / discharge plan Pcd corresponding to the temporary value A set in the immediately preceding step S107. Calculate the daily electricity bill at that time.

Subsequently, in step S107, the power control device 50 sets a value obtained by adding the predetermined time Δt to the current temporary value A as the new temporary value A.

In this way, while changing the provisional value A at a predetermined time Δt, the provisional value A is from the time when the lowest time zone TM_min ends at 7:00 to the time when the power generation of the power generation device 21 ends at 17:00, in step S105. To step S107 are repeated. The process from step S105 to step S107 is repeated, and the daily electricity charge corresponding to each temporary value A is calculated. Then, when the loop L1 ends, the process proceeds to step S108.

In step S108, the power control device 50 sets the time corresponding to the provisional value A when the electricity charge calculated in step S107 is the lowest as the discharge permission time td of the charge / discharge plan Pcd. Then, as shown in FIG. 7, the power control device 50 selects the charge / discharge plan Pcd when the discharge permission time td is set. Here, as shown in the figure, the discharge permission time td is set at 14:00.

Subsequently, in step S109, as shown in FIG. 7, the power control device 50 obtains excess / deficiency data Ded based on the excess / deficiency data Ded created in step S104 and the charge / discharge plan Pcd selected in step S108. Recreate. Specifically, the power control device 50 adds a power amount obtained by multiplying the corresponding insufficient power amount Wi and the surplus power amount We by the corresponding charging power amount Wc and the corresponding power efficiency. Further, the power control device 50 adds a power amount obtained by multiplying the corresponding shortage power amount Wi and the surplus power amount We by the corresponding discharge power amount Wd and the corresponding power efficiency. In the figure, the recreated excess / deficiency data Ded is described as Ded_R.

Subsequently, in step S110, the power control device 50 executes the charge / discharge plan Pcd selected in step S108. Specifically, a signal for charging / discharging the battery 31 is transmitted to the charge / discharge control unit 44 according to the charge / discharge plan Pcd selected in step S108. Based on the signal transmitted by the power control unit 55, the charge / discharge control unit 44 charges / discharges the battery 31 according to the charge / discharge plan Pcd.

Further, when the battery 31 is charged / discharged according to the charge / discharge plan Pcd, the power control device 50 acquires each electric energy from each watt-hour meter. Specifically, the power control device 50 acquires the second system electric energy Ws2 and the second surplus electric energy We2 from the residential electric energy meter 27. The power control device 50 acquires the third system power amount Ws3 and the third surplus power amount We3 from the device-side charge amount meter 42 via the charge / discharge control unit 44. The power control device 50 acquires the charge power amount Wc and the discharge power amount Wd from the battery control unit 33 via the charge / discharge cable 41 and the charge / discharge control unit 44. The power control device 50 acquires the first discharge supply amount Wd1 from the device-side discharge amount meter 43 via the charge / discharge control unit 44. The power control device 50 acquires the second discharge supply amount Wd2 from the house side discharge amount meter 28. Then, the power control device 50 is based on the acquired electric energy, and the actual power supply rate ηs, power generation supply rate ηg, first charge efficiency ηc1, second charge efficiency ηc2, discharge efficiency ηd, and discharge supply rate ηm. Calculate power efficiency.

Subsequently, in step S111, the power control device 50 determines the corresponding electric energy and the system supply rate ηs, the power generation supply rate ηg, the first charge efficiency ηc1, the second charge efficiency ηc2, and the discharge efficiency ηd calculated in step S110. And the discharge supply rate ηm are plotted. Then, the power control device 50 corrects the efficiency map Me using the plotted values. The power control device 50 corrects, for example, a function indicating a system supply rate ηs, a power generation supply rate ηg, a charge efficiency ηc, a discharge efficiency ηd, and a discharge supply rate ηm with respect to the electric energy. For example, the power control device 50 regenerates each function by adding each plot point for the currently calculated electric energy to each plot point for the electric energy calculated in the past and stored. In FIG. 8, as an example of correction by the power control device 50, the plot points of the current first charge efficiency ηc1 are indicated by solid white circles, and the past plot points of the first charge efficiency ηc1 are indicated by dashed white circles. Has been done. Further, the plot points of the current system supply rate ηs are indicated by black circles, and the plot points of the past system supply rate ηs are indicated by triangles. Further, the approximate curves of the corrected first charge efficiency ηc1 and the system supply rate ηs are described. In the initial state, the relationships between the electric energy and the system supply rate ηs, the power generation supply rate ηg, the charge efficiency ηc, the discharge efficiency ηd, and the discharge supply rate ηm are preset. These initial values are set by experiments and simulations.

Then, the electric power control device 50 transmits the corrected efficiency map Me to the information server 60 together with the vehicle identification number ID and the vehicle type of the electric vehicle 30. Further, the power control device 50 uses this corrected efficiency map Me for the next charge / discharge plan Pcd. After that, the processing of the power control device 50 ends.

As described above, the processing of the power control device 50 is performed. Then, it will be described that the power control device 50 of the present embodiment can suppress the increase in the electricity rate.

The power control device 50 creates a charge / discharge plan Pcd based on the system supply rate ηs and the first charge efficiency ηc1. As a result, the power control device 50 can create a charge / discharge plan Pcd for charging the battery 31 of the electric vehicle 30 when the system supply rate ηs and the first charge efficiency ηc1 are high. When the system supply rate ηs is high, the ratio of the third system electric energy Ws3 to the second system electric energy Ws2 is large, and when the first charging efficiency ηc1 is high, the ratio of the charging electric energy Wc to the third system electric energy Ws3 is large. .. Therefore, by charging the battery 31 when the system supply rate ηs and the first charging efficiency ηc1 are high, it is used for charging the battery 31 as compared with the case where the system supply rate ηs and the first charging efficiency ηc1 are low. The system power amount Ws to be generated becomes smaller. Therefore, the power control device 50 can reduce the electricity charge and suppress the increase in the electricity charge.

Here, as shown in FIG. 7, the power control device 50 sets a charge / discharge plan Pcd that increases the charge power amount Wc for each predetermined period in the time zone from 0:00 to 7:00, which is the lowest time zone TM_min. Creating. Further, the power control device 50 creates a charge / discharge plan Pcd that increases the charge power amount Wc for each predetermined period within the specifications of the charge / discharge device 40 and the battery 31. In the charge / discharge plan Pcd, when the charging electric energy Wc for each predetermined period becomes large, the second system electric energy Ws2 and the third system electric energy Ws3 for each predetermined period become large in order to charge the battery 31.

Further, here, as shown in FIG. 2, the system supply rate ηs increases as the electric energy corresponding to the system supply rate ηs, that is, the second system electric energy Ws2 increases. Further, as the electric energy corresponding to the first charging efficiency ηc1, that is, the third system electric energy Ws3 increases, the first charging efficiency ηc1 increases.

Therefore, in the time zone from 0:00 to 7:00, the power control device 50 has a charging electric energy Wc at which the system supply rate ηs and the first charging efficiency ηc1 are maximum values, and here, a relatively large charging electric energy Wc. We are making a plan to charge the battery 31. Since the charging electric energy Wc for each predetermined period is large, the second system electric energy Ws2 and the third system electric energy Ws3 for each predetermined period are large, so that the system supply rate ηs and the first charging efficiency ηc1 are high. When the system supply rate ηs and the first charging efficiency ηc1 are high, the system electric energy Ws used for charging the battery 31 is smaller than when the system supply rate ηs and the first charging efficiency ηc1 are low. Therefore, the electricity rate becomes cheaper, and the increase in the electricity rate is suppressed.

Further, the power control device 50 creates a charge / discharge plan Pcd based on the discharge efficiency ηd and the discharge supply rate ηm. As a result, the power control device 50 can create a charge / discharge plan Pcd that prohibits the discharge of the battery 31 when the discharge efficiency ηd and the discharge supply rate ηm are low. When the discharge efficiency ηd is low, the ratio of the first discharge supply amount Wd1 to the discharge power amount Wd is small, and when the discharge supply rate ηm is low, the ratio of the second discharge supply amount Wd2 to the first discharge supply amount Wd1 is small. Therefore, when the discharge efficiency ηd and the discharge supply rate ηm are low, the discharge of the battery 31 is prohibited, so that the discharge power amount Wd used to compensate for the insufficient power amount Wi is suppressed from increasing. .. Therefore, it is suppressed that the system power amount Ws used for charging for the consumed discharge power amount Wd is suppressed, so that the increase in the electricity charge is suppressed.

Further, the power control device 50 creates a charge / discharge plan Pcd based on the system supply rate ηs, the first charge efficiency ηc1, the discharge efficiency ηd, the discharge supply rate ηm, and the power purchase price Cp. As a result, the power control device 50 can further suppress the increase in the electricity charge.

Here, for example, the electricity charge for charging the electric energy for the discharge electric energy Wd may be higher than the electric charge when the electric energy supplemented by the discharge electric energy Wd is supplemented by the first system electric energy Ws1. is there. In this case, the electricity charge for charging the battery 31 becomes high, so that the user of the house 20 loses the electricity charge. Then, in order to explain that the increase in the electricity charge is further suppressed by the power control device 50, in the following, the electricity charge for charging the power amount corresponding to the discharge power amount Wd and the power amount supplemented by the discharge power amount Wd. The electricity charge when supplementing with the first system electric energy Ws1 will be described.

The electricity charge for charging the electric energy for the discharge electric energy Wd is the electricity purchase price Cp when charging the battery 31 to the second system electric energy Ws2 for charging the electric energy for the discharge electric energy Wd. Calculated by multiplying. As described above, the second system electric energy Ws2 is the amount of electric energy supplied from the distribution board 23 to the charging / discharging device 40 via the home power line 22 in the system electric energy Ws.

Further, when the electric power from the system power source 11 is supplied to the electric vehicle 30 via the charging / discharging device 40, a power loss occurs in the electric vehicle 30 and the charging / discharging device 40.

Therefore, the second system electric energy Ws2 for charging the electric energy for the discharge electric energy Wd is calculated by multiplying the second system electric energy Ws2 by the system supply rate ηs and the first charging efficiency ηc1. To. Therefore, the second system electric energy Ws2 for charging the electric energy corresponding to the discharge electric energy Wd is expressed by the following relational expression (4-1). As a result, the second system electric energy Ws2 is expressed by the following relational expression (4-2).

Therefore, the electricity charge for charging the electric energy for the discharge electric energy Wd is calculated by multiplying the second system electric energy Ws2 by the electricity purchase price Cp when charging the battery 31. It is expressed as in equation (4-3). In the following relational expression, the electricity charge for charging the electric energy corresponding to the discharge electric energy Wd is described as F1. Further, the power purchase price Cp when charging the battery 31 is described as Cp1.

Wd = Ws2 × ηs × ηc1 ・ ・ ・ (4-1)
Ws2 = Wd / (ηs × ηc1) ・ ・ ・ (4-2)
F1 = Ws2 × Cp1
= (Wd / (ηs × ηc1)) × Cp1 ・ ・ ・ (4-3)

Subsequently, when the amount of power supplemented by the discharge power amount Wd is supplemented by the first system power amount Ws1, the electricity charge is such that the battery 31 is discharged to the first system power amount Ws1 corresponding to the amount of power supplemented by the discharge power amount Wd. It is calculated by multiplying the electricity purchase price Cp at the time of making the electricity. As described above, the first system electric energy Ws1 is the amount of electric energy supplied from the distribution board 23 to the power consuming device 24 via the home power line 22 in the system electric energy Ws.

Further, when the discharge power of the battery 31 is supplied to the distribution board 23 via the charge / discharge device 40, there is a power loss due to the electric vehicle 30 and the charge / discharge device 40.

Therefore, the amount of power supplemented by the amount of discharge power Wd, that is, the second amount of discharge supply Wd2, is calculated by multiplying the amount of discharge power Wd by the discharge efficiency ηd and the discharge supply rate ηm. Therefore, the second discharge supply amount Wd2 is expressed by the above relational expression (2-3).

Since the power control device 50 considers the power loss due to the distribution board 23 to be zero, if the first system power amount Ws1 corresponding to the power amount supplemented by the discharge power amount Wd is equal to the second discharge supply amount Wd2. I reckon.

Therefore, the electricity charge when the power amount supplemented by the discharge power amount Wd is supplemented by the first system power amount Ws1 is obtained by multiplying the second discharge supply amount Wd2 by the power purchase price Cp when discharging the battery 31. Since it is calculated, it is expressed as the following relational expression (4-4). That is, the electricity charge when the amount of power supplemented by the amount of discharge power Wd is supplemented by the amount of power Ws1 of the first system is the discharge efficiency ηd, the discharge supply rate ηm, and the purchase of electricity when the battery 31 is discharged. Calculated by multiplying the price Cp. In the relational expression, the electricity charge when the electric energy supplemented by the discharge electric energy Wd is supplemented by the first system electric energy Ws1 is described as F2. Further, the power purchase price Cp when the battery 31 is discharged is described as Cp2.

F2 = Wd2 x Cp2
= Wd × ηd × ηm × Cp2 ・ ・ ・ (4-4)

Then, when the electricity charge for charging the electric energy for the discharge electric energy Wd is higher than the electric charge when the electric energy supplemented by the discharge electric energy Wd is supplemented by the system electric energy Ws, F1 is higher than F2. When it gets higher. Therefore, in this case, the following relational expression (4-5) is established by using the above relational expressions (4-3) and (4-4). That is, in this case, the value obtained by multiplying the system supply rate ηs, the first charge efficiency ηc1, the discharge efficiency ηd, and the discharge supply rate ηm is the power purchase price Cp when charging the battery 31 and when the battery 31 is discharged. It is less than the value multiplied by the power purchase price Cp.

Further, when the electricity charge for charging the electric energy for the discharge electric energy Wd is less than the electric charge when the electric energy supplemented by the discharge electric energy Wd is supplemented by the system electric energy Ws, the user of the house 20 is asked. Earn electricity bills. In this case, since F1 is F2 or less, the following relational expression (4-6) holds. That is, in this case, the value obtained by multiplying the system supply rate ηs, the first charge efficiency ηc1, the discharge efficiency ηd, and the discharge supply rate ηm is the purchase price Cp when the battery 31 is charged and the purchase price when the battery 31 is discharged. It is equal to or greater than the value multiplied by the electric price Cp.

F2 <F1
ηs × ηc1 × ηd × ηm <Cp1 / Cp2 ・ ・ ・ (4-5)
F2 ≧ F1
ηs × ηc1 × ηd × ηm ≧ Cp1 / Cp2 ・ ・ ・ (4-6)

For example, the power purchase price Cp when charging the battery 31, that is, Cp1 is set to 10 yen per unit electric energy. The purchase price Cp when discharging the battery 31, that is, Cp2 is set to 20 yen per unit electric energy. In this case, when the value obtained by multiplying the system supply rate ηs, the first charge efficiency ηc1, the discharge efficiency ηd and the discharge supply rate ηm is less than 50%, the user of the house 20 loses the electricity charge. Further, when the value obtained by multiplying the system supply rate ηs, the first charge efficiency ηc1, the discharge efficiency ηd and the discharge supply rate ηm is 50% or more, the user of the house 20 obtains the electricity charge.

Then, when the power control device 50 creates the charge / discharge plan Pcd in step S105 based on the system supply rate ηs, the first charge efficiency ηc1, the discharge efficiency ηd, the discharge supply rate ηm, and the power purchase price Cp, the above It is possible to determine the profit or loss of the electricity charge.

Here, as shown in FIG. 7, the power control device 50 has the above-mentioned power control device 50 from 17:00 to 24:00, which is a time zone in which the power purchase price Cp is relatively low and the shortage power amount Wi for each predetermined period is relatively small. Since Cp2 is small, the value obtained by dividing the above Cp1 by Cp2 becomes large. Further, as the insufficient electric energy Wi for each predetermined period becomes smaller, the discharge electric energy Wd and the first discharge supply amount Wd1 for each predetermined period become smaller.

Further, here, as shown in FIG. 2, the discharge efficiency ηd decreases as the electric energy corresponding to the discharge efficiency ηd, that is, the discharge electric energy Wd becomes smaller. Further, as the amount of electric power corresponding to the discharge supply rate ηm, that is, the first discharge supply amount Wd1, becomes smaller, the discharge supply rate ηm becomes lower.

Further, the discharge power amount Wd and the first discharge supply amount Wd1 become large from 17:00 to 21:00, which is a time zone in which the power purchase price Cp is relatively low and the shortage power amount Wi for each predetermined period is relatively large. Therefore, the discharge efficiency ηd and the discharge supply rate ηm are higher in the time zone from 17:00 to 21:00 than in the time zone from 21:00 to 24:00, which is the time zone in which the insufficient electric energy Wi for each predetermined period is relatively small. It gets higher. Therefore, from 17:00 to 21:00, the above relational expression (4-6) holds, so that the user of the house 20 obtains the electricity rate. Therefore, in step S105, the power control device 50 creates a charge / discharge plan Pcd for discharging the battery 31 from 17:00 to 21:00.

Further, the discharge power amount Wd and the first discharge supply amount Wd1 become small from 21:00 to 24:00, which is a time zone in which the power purchase price Cp is relatively low and the shortage power amount Wi for each predetermined period is relatively small. Therefore, the discharge efficiency ηd and the discharge supply rate ηm are higher in the time zone from 21:00 to 24:00 than in the time zone from 17:00 to 21:00, which is the time zone in which the insufficient electric energy Wi for each predetermined period is relatively large. It gets lower. Therefore, since the above relational expression (4-5) holds from 21:00 to 24:00, the user of the house 20 loses the electricity charge. Therefore, in step S105, the power control device 50 creates a charge / discharge plan Pcd that prohibits the discharge of the battery 31 from 21:00 to 24:00. As a result, the increase in electricity prices is further suppressed.

In addition, the power control device 50 of the present embodiment also has the effects described below.

The power control device 50 has a system supply rate ηs, a power generation supply rate ηg, a first charge efficiency ηc1, a second charge efficiency ηc2, and a discharge corresponding to each electric energy when the battery 31 is charged / discharged according to the charge / discharge plan Pcd. The actual power efficiency of the efficiency ηd and the discharge supply rate ηm is calculated. Then, based on these calculated values, the power control device 50 has a system supply rate ηs, a power generation supply rate ηg, a first charge efficiency ηc1, a second charge efficiency ηc2, and a discharge efficiency when creating the charge / discharge plan Pcd. Correct ηd and discharge supply rate ηm.

As a result, the accuracy of the system supply rate ηs, the first charge efficiency ηc1, the discharge efficiency ηd, and the discharge supply rate ηm when creating the charge / discharge plan Pcd is improved. Therefore, the accuracy of the third system electric energy Ws3, the charging electric energy Wc, and the first discharge supply amount Wd1 is improved, so that the accuracy of the system electric energy Ws is improved. Therefore, the amount of deviation between the electricity charge during the execution of the charge / discharge plan Pcd and the electricity charge when the charge / discharge plan Pcd is created becomes small, and the increase in the electricity charge is suppressed.

(Other embodiments)
The present invention is not limited to the above embodiment, and can be appropriately modified with respect to the above embodiment. Further, in each of the above embodiments, it goes without saying that the elements constituting the embodiment are not necessarily essential except when it is clearly stated that they are essential and when they are clearly considered to be essential in principle. No.

Each predictor, each creator, each corrector and method thereof described in the present disclosure constitutes a processor and memory programmed to perform one or more functions embodied by a computer program. It may be realized by a dedicated computer provided by. Alternatively, each predictor, each creator, each corrector and method thereof described in the present disclosure may be realized by a dedicated computer provided by configuring the processor with one or more dedicated hardware logic circuits. Good. Alternatively, each predictor, each creator, each corrector and method thereof described in the present disclosure is a processor and memory programmed to perform one or more functions and one or more hardware logic circuits. It may be realized by one or more dedicated computers configured in combination with a processor configured by. Further, the computer program may be stored in a computer-readable non-transitional tangible recording medium as an instruction executed by the computer.

(1) In the above embodiment, the power control device 50 creates an efficiency map Me, which is a relationship between each power amount and each power efficiency. On the other hand, the power control device 50 provides efficiency maps Me of the first charge efficiency ηc1, the second charge efficiency ηc2, and the discharge efficiency ηd based on each electric energy and the battery temperature Tb of the battery 31 of the electric vehicle 30. You may create it.

For example, when the battery temperature Tb is relatively low, charging / discharging the battery 31 makes it difficult for ions that contribute to the charging / discharging of the battery 31 to move. When it becomes difficult for ions that contribute to charging / discharging of the battery 31 to move, it becomes difficult for the main reaction that contributes to charging / discharging of the battery 31 to proceed.
Further, when the battery 31 is charged and discharged when the battery temperature Tb is relatively high, substances generated by a side reaction that does not contribute to the charging and discharging of the battery 31 are likely to be accumulated in the battery 31, and ions that contribute to the charging and discharging of the battery 31. It becomes difficult to move. When it becomes difficult for ions that contribute to charging / discharging of the battery 31 to move, it becomes difficult for the main reaction that contributes to charging / discharging of the battery 31 to proceed. Therefore, as shown in FIG. 9, in the efficiency map Me when each electric energy is a fixed value, when the battery temperature Tb is relatively low and when the battery temperature Tb is relatively high, the first charging efficiency ηc1 The second charge efficiency ηc2 and the discharge efficiency ηd become low.

Further, in this case, in step S101, the power control device 50 acquires the vehicle identification number ID and the battery temperature Tb as vehicle information via the battery control unit 33, the charge / discharge cable 41, and the charge / discharge control unit 44. Then, the power control device 50 reads out the efficiency map Me corresponding to the vehicle identification number ID and the battery temperature Tb.

Further, in step S110, the power control device 50 corresponding to the temperature reading unit and the temperature compensating unit acquires each electric energy and the battery temperature Tb when the battery 31 is charged / discharged according to the charge / discharge plan Pcd.

Further, in step S111, the power control device 50 plots the corresponding electric energy and battery temperature Tb, and the charge efficiency ηc and discharge efficiency ηd calculated in step S110. Then, the power control device 50 corrects the efficiency map Me using the plotted values. For example, when each electric energy is set to a fixed value, the electric power control device 50 regenerates each function by adding each plot point for the currently calculated temperature to each plot point for the accumulated temperature calculated in the past. To be done. In the initial state, the relationship between the battery temperature Tb and the charging efficiency ηc and the discharging efficiency ηd is preset. These initial values are set by experiments and simulations.

The accuracy of the first charge efficiency ηc1, the second charge efficiency ηc2, and the discharge efficiency ηd when the power control device 50 creates the efficiency map Me based on the electric energy and the battery temperature Tb to create the charge / discharge plan Pcd. Is further improved. As a result, the power control device 50 has the same effect as described above.

(2) In the above embodiment, the initial value of the efficiency map Me created by the power control device 50 is preset by an experiment or a simulation. On the other hand, when the power control device 50 does not store the efficiency map Me in the initial state, the power control device 50 displays the efficiency map Me when the batteries 31 of the electric vehicles 30 arranged in each of the plurality of houses 20 are charged and discharged. It may be acquired from the storage information server 60.

In this case, in step S101, the charge / discharge control unit 44 acquires the vehicle type of the electric vehicle 30 as vehicle information from the battery control unit 33 via the charge / discharge cable 41. Further, the electric power control device 50 acquires the vehicle type of the electric vehicle 30 stored in the charge / discharge control unit 44, and acquires the efficiency map Me corresponding to the acquired vehicle type from the information server 60. Then, in the loop L1, the power control device 50 creates a charge / discharge plan Pcd by using the efficiency map Me acquired from the information server 60.

(4) In the above embodiment, the power control device 50 creates a charge / discharge plan Pcd for charging / discharging the battery 31. On the other hand, the power control device 50 may create a charge / discharge plan Pcd that only charges the battery 31. For example, the power control device 50 creates a charge / discharge plan Pcd that only charges the battery 31 as shown in FIG. 10 by the operation of the user who wants to charge only the battery 31.

(4) In the above embodiment, the power control device 50 creates a charge / discharge plan Pcd for charging / discharging the battery 31. On the other hand, the power control device 50 may create a charge / discharge plan Pcd that only discharges the battery 31. For example, as shown in FIG. 11, the power control device 50 causes only the discharge of the battery 31 by the operation of the user who wants to discharge only the battery 31 because the battery 31 is sufficiently charged. To create.

(5) In the above embodiment, the power control device 50 executes the charge / discharge plan Pcd selected in step S108. On the other hand, the power control device 50 calculates the system supply rate ηs, the power generation supply rate ηg, the first charge efficiency ηc1, the second charge efficiency ηc2, the discharge efficiency ηd, and the discharge supply rate while executing the charge / discharge plan Pcd. The execution content of the charge / discharge plan Pcd may be changed based on ηm. For example, the power control device 50 has a low system supply rate ηs, a power generation supply rate ηg, a first charge efficiency ηc1, a second charge efficiency ηc2, a discharge efficiency ηd, and a discharge supply rate ηm during execution, and the electricity charge is high. When is expected, the charging / discharging of the battery 31 is stopped.

(6) In the above embodiment, the power control device 50 considers the power loss due to the distribution board 23 to be zero. On the other hand, the power control device 50 may add the power loss due to the distribution board 23 to the calculation of the electricity charge or the like without considering it as zero.

(Summary)
According to the first aspect, the power control device creates a battery charge / discharge plan based on the power generation prediction data, the consumption prediction data, the grid supply rate, and the charging efficiency. This allows the power controller to create a charge / discharge plan to charge the battery when the grid supply rate and charging efficiency are high. By charging the battery when the grid supply rate and charging efficiency are high, the amount of grid power used to charge the battery is smaller than when the grid supply rate and charging efficiency are low. Therefore, the electric power control device can reduce the electricity charge and suppress the increase in the electricity charge.

According to the second aspect, the power control device creates a charge / discharge plan for charging the battery with the amount of charge power that maximizes the system supply rate and the charge efficiency. As a result, the electric power control device can reduce the electricity charge and suppress the increase in the electricity charge.

According to the third aspect, the power control device corrects the charging efficiency when creating the charge / discharge plan based on the charging efficiency when the battery is charged. As a result, the accuracy of charging efficiency is improved, so that the accuracy of the amount of system power used is improved. Therefore, the amount of deviation between the electricity charge during the execution of the charge / discharge plan and the electricity charge when the charge / discharge plan is created becomes small, and the increase in the electricity charge is suppressed.

According to the fourth aspect, the power control device corrects the system supply rate when creating the charge / discharge plan based on the system supply rate when the battery is charged. As a result, the accuracy of the grid supply rate is improved, so that the accuracy of the amount of grid power used is improved. Therefore, the amount of deviation between the electricity charge during the execution of the charge / discharge plan and the electricity charge when the charge / discharge plan is created becomes small, and the increase in the electricity charge is suppressed.

According to the fifth aspect, the power control device corrects the relationship between the battery temperature and the charging efficiency when creating the charge / discharge plan based on the temperature of the battery when the battery is charged. As a result, the accuracy of charging efficiency is improved, so that the accuracy of the amount of system power used is improved. Therefore, the amount of deviation between the electricity charge during the execution of the charge / discharge plan and the electricity charge when the charge / discharge plan is created becomes small, and the increase in the electricity charge is suppressed.

According to the sixth aspect, the power control device creates a battery charge / discharge plan based on the power generation prediction data, the consumption prediction data, the discharge efficiency and the discharge supply rate. This allows the power controller to create a charge / discharge plan that prohibits battery discharge when the discharge efficiency and discharge supply rate are low. When the discharge efficiency and the discharge supply rate are low, the discharge of the battery is prohibited, so that the amount of discharge power used to make up for the insufficient power amount is suppressed from increasing. When the amount of discharge power used to make up for the shortage of power is suppressed from increasing, the amount of system power used to charge the battery is suppressed from increasing. Therefore, the power control device can suppress the increase in the electricity rate.

According to the seventh aspect, the power control device creates a charge / discharge plan that prohibits the discharge of the battery based on the discharge efficiency and the discharge supply rate. As a result, the electric power control device can suppress an increase in electricity charges.

According to the eighth viewpoint, in the power control device, the product of the system supply rate, the charge efficiency, the discharge efficiency and the discharge supply rate determines the power purchase price when charging the battery and the power purchase price when discharging the battery. Create a charge / discharge plan that prohibits battery discharge when it is less than the value divided by. As a result, the electric power control device can suppress an increase in electricity charges.

According to the ninth aspect, the power control device corrects the discharge efficiency when creating the charge / discharge plan based on the discharge efficiency when the battery is discharged. As a result, the accuracy of the discharge efficiency is improved, so that the accuracy of the system power amount Ws used is improved. Therefore, the amount of deviation between the electricity charge during the execution of the charge / discharge plan and the electricity charge when the charge / discharge plan is created becomes small, and the increase in the electricity charge is suppressed.

According to the tenth aspect, the power control device corrects the discharge supply rate when creating the charge / discharge plan based on the discharge supply rate when the battery is discharged. As a result, the accuracy of the discharge supply rate is improved, so that the accuracy of the system power amount used is improved. Therefore, the amount of deviation between the electricity charge during the execution of the charge / discharge plan and the electricity charge when the charge / discharge plan is created becomes small, and the increase in the electricity charge is suppressed.

According to the eleventh aspect, the power control device corrects the discharge efficiency when creating the charge / discharge plan based on the temperature of the battery when the battery is discharged. As a result, the accuracy of the discharge efficiency is improved, so that the accuracy of the system power amount used is improved. Therefore, the amount of deviation between the electricity charge during the execution of the charge / discharge plan and the electricity charge when the charge / discharge plan is created becomes small, and the increase in the electricity charge is suppressed.

20 Building 21 Power generation device 24 Power consumption equipment 30 Power storage device 31 Battery 40 Power storage device 50 Power control device

Claims (11)

A power generation prediction unit (S102) that creates power generation prediction data (Dgf) that predicts changes in the amount of power generated by the power generation device (21) arranged in the building (20).
A consumption prediction unit (S103) that creates consumption prediction data (Dcf) that predicts changes in the amount of power consumed by the power consumption device (24) arranged in the building, and
The charge to the electric energy (Ws2) supplied from the power generation prediction data, the consumption prediction data, and the system power source (11) to the charging / discharging device (40) for charging / discharging the battery (31) of the power storage device (30). The power charged to the battery with respect to the system supply rate (ηs), which is the ratio of the electric energy (Ws3) supplied from the discharge device to the battery, and the electric energy (Ws3) supplied from the charge / discharge device to the power storage device. A planning unit (S105) that creates a charge / discharge plan (Pcd) for the battery based on the charging efficiency (ηc1), which is a ratio of the amount (Wc).
A power control device equipped with. The planning unit creates the charge / discharge plan (Pcd) for charging the battery with the electric energy (Wc) charged to the battery at which the system supply rate and the charging efficiency are the maximum values. The power control device described in. The planning unit is based on the ratio (ηc1) of the amount of power (Wc) charged to the battery to the amount of power (Ws3) supplied from the charging / discharging device to the power storage device when the battery is charged. The power control device according to claim 1 or 2, further comprising a charge correction unit (S111) for correcting the charge efficiency when the charge / discharge plan is created. Based on the ratio (ηs) of the amount of power (Ws3) supplied from the charging / discharging device to the battery when the battery is charged to the amount of power (Ws2) supplied from the system power source to the charging / discharging device. The power control device according to any one of claims 1 to 3, further comprising a supply correction unit (S111) for correcting the system supply rate when the plan creation unit creates the charge / discharge plan. A temperature reading unit (S101) that reads out the charging efficiency based on the battery temperature (Tb), and
With respect to the electric energy (Ws3) supplied from the charging / discharging device to the power storage device corresponding to the temperature of the battery acquired when the battery is charged and the temperature of the battery acquired when the battery is charged. A temperature correction unit (S111) that corrects the relationship between the temperature of the battery and the charging efficiency based on the ratio (ηc1) of the electric energy (Wc) charged in the battery.
The power control device according to any one of claims 1 to 4, further comprising. A power generation prediction unit (S102) that creates power generation prediction data (Dgf) that predicts changes in the amount of power generated by the power generation device (21) arranged in the building (20).
A consumption prediction unit (S103) that creates consumption prediction data (Dcf) that predicts changes in the amount of power consumed by the power consumption device (24) arranged in the building, and
The power supplied from the battery to the charging / discharging device (40) for charging / discharging the battery with respect to the power generation prediction data, the consumption prediction data, and the electric energy (Wd) discharged by the battery (31) of the power storage device (30). The discharge efficiency (ηd), which is a ratio of the amount (Wd1), and the amount of power (Wd2) supplied from the charge / discharge device to the power consuming device with respect to the amount of power (Wd1) supplied from the battery to the charge / discharge device. A plan creation unit (S105) that creates a charge / discharge plan for the battery based on the discharge supply rate (ηm), which is a ratio, and
A power control device equipped with. The power control device according to claim 6, wherein the plan creation unit creates the charge / discharge plan that prohibits the discharge of the battery based on the discharge efficiency and the discharge supply rate. The planning unit determines the ratio (ηs) of the amount of power (Ws3) supplied from the charging / discharging device to the battery to the amount of power (Ws2) supplied from the system power source (11) to the charging / discharging device. The product of the ratio (ηc1) of the amount of power (Wc) charged to the battery to the amount of power (Ws3) supplied from the charging / discharging device to the power storage device, the discharging efficiency, and the discharging supply rate is the product of the charging of the battery. Claim 7 for creating the charge / discharge plan for prohibiting the discharge of the battery when the power purchase price (Cp1) at the time of causing the battery is less than the value divided by the power purchase price (Cp2) at the time of discharging the battery. The power control device described in. When the battery is discharged, the planning unit makes the planning unit based on the ratio (ηd) of the electric energy (Wd1) supplied from the battery to the charging / discharging device with respect to the electric energy (Wd) discharged by the battery. The power control device according to any one of claims 6 to 8, further comprising a discharge correction unit (S111) for correcting the discharge efficiency when creating a charge / discharge plan. Based on the ratio (ηm) of the amount of power (Wd2) supplied from the charging / discharging device to the power consuming device to the amount of power (Wd1) supplied from the battery to the charging / discharging device when the battery is discharged. The power control device according to any one of claims 6 to 9, further comprising a supply correction unit (S111) for correcting the discharge supply rate when the plan creation unit creates the charge / discharge plan. A temperature reading unit (S101) that reads out the discharge efficiency based on the battery temperature (Tb), and
The charge / discharge device from the battery with respect to the amount of power (Wd) discharged by the battery corresponding to the temperature of the battery acquired when the battery is discharged and the temperature of the battery acquired when the battery is discharged. A temperature correction unit (S111) that corrects the relationship between the battery temperature and the discharge efficiency based on the ratio (ηd) of the amount of power (Wd1) supplied to the battery.
The power control device according to any one of claims 6 to 10, further comprising.

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