JP2018174623A - Power management device, and application power generation amount calculation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power management device capable of suppressing imbalance even in a case where power is not generated as predicted.SOLUTION: A power management device comprises: a prediction amount calculation part for calculating a prediction power generation amount that is a prediction value of a power generation amount by a power generation device, and a prediction power storage amount that is a prediction value of a power storage amount of a power storage device, during a planning target period; and an application power generation amount calculation part for calculating an application power generation amount during the planning target period on the basis of the prediction power generation amount and the prediction power storage amount.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power management apparatus and an applied power generation amount calculation method for suppressing imbalance.

Electricity providers (power retailers and power generation companies) forecast demand and power generation, submit demand plans and power generation plans to general power transmission and distribution companies, and the actual value is the same as the planned value. Is required to be. In this case, if an imbalance occurs where the actual value is excessive or deficient with respect to the planned value, costs will be incurred for the adjustment of imbalance on the general transmission / distribution company side. Settlement corresponding to imbalance (imbalance settlement) is performed with general power transmission and distribution companies. Therefore, it is necessary for the electric power company to adjust the power so that payment by imbalance settlement does not occur.
Here, a difference (imbalance) between the actual demand amount and the power generation amount may occur due to changes in weather conditions or the like. The difference is filled by the supply and demand adjustment, but an imbalance fee will be generated for the finally generated difference, which will increase the power cost.
In a house equipped with a solar power generation device, a power generation imbalance with respect to the power generation amount prediction of the solar power generation device and a demand imbalance based on the demand prediction of each household occur.
In order to reduce the cost due to imbalance, an apparatus for reducing the imbalance cost by estimating the surplus power when the generated power of the photovoltaic power generation apparatus becomes surplus has also been proposed (Patent Document 1).

JP-A-2015-153346

  However, even if the prediction accuracy of the generated power is improved, the weather may not be as predicted, so the generated power is not always as predicted. If it does so, also about the suppression of imbalance, the range which can be suppressed will be influenced by the weather, As a result, there exists a problem that it becomes easy to produce imbalance.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power management apparatus and a method for calculating the applied power generation amount that can suppress imbalance due to external factors such as weather. .

  In order to solve the above-described problem, the power management apparatus according to the present invention provides a predicted power generation amount that is a predicted value of the power generation amount by the power generation device and a predicted power storage amount that is a prediction value of the power storage amount of the power storage device in the planning target period. And a requested power generation amount calculation unit that calculates a requested power generation amount in the period to be planned based on the predicted power generation amount and the predicted power storage amount.

  Further, in the power management apparatus described above, the application power generation amount calculation unit may include a remaining amount of the predicted power storage amount in the predicted power generation amount when the predicted power storage amount is equal to or greater than a predetermined reference value. Is calculated as the applied power generation amount.

  In the power management apparatus described above, the application power generation amount calculation unit may calculate a difference between the predicted power storage amount and the reference value when the predicted power storage amount is less than a predetermined reference value. Accordingly, a value lower than the predicted power generation amount is calculated as the application power generation amount.

  Further, the present invention includes a transmission unit that transmits, to an external device, applied power generation amount data indicating the applied power generation amount in the calculated planning target period.

  Further, according to the present invention, in the above power management device, when a difference occurs between the applied power generation amount and the actual value of the power generation amount by the power generation device, the power generation device generates power according to the difference. A power control unit that supplies a part of the generated power to the power storage device to charge or generate power from the power storage device.

  The present invention is the above-mentioned power management device, a method for calculating the applied power generation amount in the power management device, wherein the predicted amount calculation unit is a predicted power generation amount that is a predicted value of the power generation amount by the power generation device in the planning target period. And a predicted power storage amount that is a predicted value of the power storage amount of the power storage device, and the applied power generation amount calculation unit calculates the applied power generation amount during the planning target period based on the predicted power generation amount and the predicted power storage amount. This is a method for calculating the applied power generation amount.

  In the present invention, the charge for imbalance settlement caused by imbalance can be reduced by performing the charge / discharge operation of the power storage device. In the present invention, the imbalance can be further reduced by performing the charging or discharging operation in consideration of the remaining amount of the power storage device.

The power generation amount and the power storage amount at each time are predicted, and in the time zone when the power storage amount is small, the possibility of performing imbalance adjustment by discharging is reduced by applying for the applied power generation amount less than the original predicted power generation amount. On the other hand, in a time zone with a large amount of power storage, the possibility of performing imbalance adjustment by charging is reduced by making the applied power generation amount larger than the original predicted power generation amount.
Moreover, according to this invention, it becomes possible to reduce electric power procurement cost by increasing the possibility of performing imbalance avoidance using a storage battery. As a result, the business potential as a power retail business is enhanced, and it is possible to return to customers.

  As described above, according to the present invention, even if the power generation according to the predicted power generation amount cannot be performed due to the influence of the weather, the applied power generation in the target period based on the predicted power generation amount and the predicted power storage amount. Since the amount is calculated, it is possible to increase the room for adjusting the imbalance using the amount of power stored in the power storage device, and thus it is possible to suppress the imbalance.

It is a schematic block diagram which shows the structure of the power management system in 1st Embodiment of this invention. 4 is a flowchart for explaining the operation of the power management apparatus 13 in the power distribution control system 1. It is a figure explaining the relationship between application power generation amount and charging / discharging of the electrical storage apparatus. It is a graph showing an example of the relationship between the amount of electric power and time when the amount of electricity stored in the electricity storage device 12 is greater than or equal to a reference value at the start of the period to be planned. It is a figure explaining the case where a difference arises between application power generation amount and the actual value of power generation amount. It is a figure explaining the relationship between the electric power of charging / discharging and SOC of the electrical storage apparatus. It is a figure explaining the relationship between the electric power of charging / discharging and SOC of the electrical storage apparatus.

Hereinafter, a power management system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing the configuration of the power management system according to the first embodiment of the present invention.
The power management system 1 includes a solar power generation device 10, a power conditioner (PCS) 11, a power storage device 12, a power management device 13, and a distribution board 14.
The solar power generation device 10 receives sunlight to generate power.
The PCS 11 has a function of supplying DC power generated by the solar power generation device 10 to a DC load (for example, the power storage device 12), and converts DC power generated by the solar power generation device 10 into AC power. It has a function of supplying power to the switchboard 14 and a function of converting DC power supplied from the power storage device 12 into AC power and supplying it to the distribution board 14. The PCS 11 executes these power supply functions based on an instruction from the power control unit 133. An integrated power conditioner can be used as the PCS 11.

  The power storage device 12 charges the power supplied from the PCS 11 during power storage, and discharges the charged power to the PCS 11 during discharge. The power storage device 12 only needs to be able to store electric power. For example, a storage battery, an electric double layer capacitor, a flywheel battery, or the like can be used.

The power management apparatus 13 includes a predicted amount calculation unit 131, an applied power generation amount calculation unit 132, a power control unit 133, a storage unit 134, and a communication unit 135.
The predicted amount calculation unit 131 calculates a predicted power generation amount that is a predicted value of the power generation amount by the power generation device and a predicted power storage amount that is a predicted value of the power storage amount of the power storage device in the period to be planned. The period to be planned may be, for example, from 0 o'clock to 24 o'clock on the next day (for one day). The predicted amount calculation unit 131 calculates the predicted power generation amount and the predicted power storage amount each time the timing for calculating the applied power generation amount data arrives. The application power generation amount data calculation timing may be a predetermined time (for example, 23:00) on the previous day for calculating the predicted power generation amount, or every 30 minutes (every demand time).
The predicted amount calculation unit 131 obtains a required power prediction function for obtaining a required power amount that is the amount of power required to store power in the power storage device 12 and a predicted power generation amount that is a predicted value of the power generation amount generated by the solar power generation device 10. And a power generation amount prediction function to be obtained.

The applied power generation amount calculation unit 132 calculates the applied power generation amount in the planning target period based on the predicted power generation amount and the predicted power storage amount.
The applied power generation amount calculation unit 132 calculates the applied power generation amount by adding at least a part of the remaining amount of the predicted power storage amount to the predicted power generation amount when the predicted power storage amount is equal to or greater than a predetermined reference value. The applied power generation amount calculation unit 132 may store the reference value in its own storage area, or may store the reference value in the storage unit 134 for reference. When at least a part of the remaining amount of the predicted power storage amount is added to the predicted power generation amount, a difference between the remaining amount indicated by the predicted power storage amount and the reference value may be added. By adding a part of the predicted power storage amount to the predicted power generation amount, it is possible to plan and apply for the reverse power flow of power larger than the predicted power generation amount. In addition, the electric power can be effectively used by causing the power storage amount that does not need to be stored in the power storage device 12 to flow backward.
Moreover, when adding at least a part of the remaining amount of the predicted power storage amount to the predicted power generation amount, by discharging from the power storage device 12 so as to fill the difference between the applied power generation amount and the actual power generation amount of the solar power generation device 10 Even if the actual power generation amount of the photovoltaic power generation apparatus 10 becomes smaller than the predicted power generation amount due to the weather, the difference between the applied power generation amount and the actual reverse power flow should not occur. As a result, imbalance can be reduced.

  For example, if the capacity of the storage battery is 7 kWh and the charge amount at a certain time is 6.8 kWh, the available capacity of the storage battery is 0.2 kWh, so that only 0.2 kWh can be used to avoid imbalance on the charging side. Absent. In such a situation, when the predicted power generation amount for the next demand time (for example, 30 minutes) is 2 kWh, the application power generation amount calculation unit 132 calculates the application power generation amount as 2.5 kWh. The difference between the predicted power generation amount and the applied power generation amount, 0.5 kWh, can be carried out as planned by applying the reverse power flow by discharging from the storage battery. (In this setting, if the average output does not deviate by 1 kW or more, imbalance does not work on the charge side, and the storage battery charge amount does not increase).

  When the predicted power storage amount is less than the predetermined reference value, the applied power generation amount calculation unit 132 calculates a value lower than the predicted power generation amount as the applied power generation amount according to the difference between the predicted power storage amount and the reference value. . As an example of calculating a value lower than the predicted power generation amount according to the difference between the predicted power storage amount and the reference value, the difference between the remaining amount indicated by the predicted power storage amount and the reference value is subtracted from the predicted power storage amount. Also good. Accordingly, a part of the power generated by the solar power generation device 10 can be reversely flowed, and the rest can be used as electric power for charging the power storage device 12. By charging the power storage device 12, for example, by charging until the target power storage amount is reached, by supplying power from the power storage device 12 to the indoor load at the time of peak power demand, peak cut while reducing imbalance Can also be done. Further, when a value lower than the predicted power generation amount is calculated as the applied power generation amount according to the difference between the predicted power storage amount and the reference value, the difference between the applied power generation amount and the actual power generation amount of the solar power generation device 10 is filled. In addition, even if the actual power generation amount of the solar power generation device 10 becomes larger than the predicted power generation amount due to the weather by charging the power storage device 12, the applied power generation amount and the actual reverse power flow power Therefore, the imbalance can be reduced.

  The power control unit 133 supplies at least a part of the DC power input from the solar power generation device 10 to the PCS 11 to the power storage device 12 and charges it, or supplies it to the distribution board 14 to load the indoor load. Or supply (reverse power flow) to the grid. In addition, the power control unit 133 performs control to supply the electric power discharged from the power storage device 12 to the indoor load via the distribution board 14 or supply (reverse power flow) to the system.

  When there is a difference between the applied power generation amount and the actual value of the power generation amount by the power generation device, the power control unit 133 transfers a part of the power generated by the power generation device to the power storage device according to the difference. The power is supplied to the battery, and charging or power generation from the power storage device is performed. Here, FIG. 5 is a figure for demonstrating the case where a difference arises between application power generation amount and the actual value of power generation amount. In FIG. 5A, the applied power generation amount can be obtained from the predicted power generation amount as the difference between the predicted demand and the charge amount (or power generation amount). Here, as shown in FIG. 5B, the actual power generation amount and the actual demand even when the reverse power flow is performed at the same applied power generation amount as that obtained in FIG. 5A. May not be as expected. In that case, imbalance occurs when nothing is done. In addition, for example, when the actual power generation amount is larger than the applied power generation amount, but the actual power demand is larger than the predicted power demand (or the actual power demand is almost equal to the expected power demand, When the actual power generation amount is smaller than the expected power generation amount, imbalance occurs (reference numeral 500).

Therefore, the power control unit 133 uses the power storage device 12 in accordance with the resulting imbalance (difference), thereby charging or discharging the power storage device 12 (reference numeral 510) to reduce the imbalance. Alternatively, it can be eliminated (reference numeral 520). FIG. 5B is an example in which the imbalance is reduced by discharging from the storage battery because the actual power generation amount is smaller than the applied power generation amount.
On the other hand, FIG. 5C shows an example in which the imbalance is reduced by charging the storage battery because the actual power generation amount is larger than the applied power generation amount. That is, in the case where the actual power generation amount is larger than the applied power generation amount, if the actual demand is smaller than the predicted power demand, an imbalance occurs due to the surplus power generation amount (reference numeral 530). . In such a case, the difference between the applied power generation amount and the actual power generation amount can be reduced (reference number 550) by charging the power storage device 12 with the surplus power generated by this power generation (reference number 540).

  The storage unit 134 stores various data. For example, past power generation history data is stored. The power generation history data includes, for example, the date of power generation, the weather of the day (sunny, cloudy, rain, sunny and cloudy, etc.), temperature data, humidity, wind direction, wind speed, weather map, etc., and the sun on that day This is data in which the power generation amount of the photovoltaic power generation apparatus 10 is associated with the actual value for each time.

  The communication unit 135 transmits applied power generation amount data indicating the applied power generation amount in the calculated target period to the external device. As an external device, for example, there is a server of a general power transmission / distribution company, or a server of an electric power company (power retailer or power generation company). When the requested power generation amount data is transmitted to the server of the general power transmission / distribution company, the general power transmission / distribution company uses it as a predicted value of the reverse power flow based on this application power generation amount data, and in the target period A power generation plan can be made. When the requested power generation amount data is transmitted to the server of the electric power company, it is possible to make a plan for the amount of power that the electric power company supplies from the general power transmission and distribution business based on the applied power generation amount data.

  In response to an instruction from the power control unit 133, the distribution board 14 causes the power to flow backward to the system or supplies power to the indoor load.

Next, operation | movement of the power management apparatus 13 in the above-mentioned power distribution control system 1 is demonstrated using the flowchart of FIG.
When the timing for calculating the applied power generation amount data arrives, the predicted amount calculation unit 131 of the power management apparatus 13 uses the communication unit 135 from an external server (weather forecast server) that stores the weather forecast information in the period to be planned. The weather forecast information of the area where the solar power generation device 10 is installed is acquired (step S101). For example, when the period of the planning target is in units of one day, the weather forecast information of the next day (planning target day) is acquired at a predetermined time (23:00) the day before the planning target day. The predicted amount calculation unit 131 refers to the obtained weather forecast information and the past power generation history stored in the storage unit 134, and calculates the predicted power generation amount of the next day (step S102). For example, weather forecast data including the weather, temperature, humidity, wind direction, wind speed, weather map, etc. of the next day obtained from the weather forecast, and weather, temperature, humidity, wind direction, wind speed, weather map of the same time in the past Are extracted, and the predicted power generation amount is calculated by reading the actual value of the power generation amount of the photovoltaic power generation apparatus 10 on that day.

  Next, the predicted amount calculation unit 131 calculates a predicted power storage amount (step S103). As the predicted power storage amount, the power storage amount itself at that time (23:00 on the day before the planning target day) may be used, or based on the power storage amount at that time, the power of the power storage device according to the power consumption plan It is also possible to calculate the amount of electricity stored when the power consumption is predicted.

  When the predicted power storage amount is obtained, the applied power generation amount calculation unit 132 determines whether or not the predicted power storage amount is greater than or equal to a reference value (step S104). The applied power generation amount calculation unit 132 applies the applied power generation by adding at least a part of the remaining amount of the predicted stored electricity amount to the predicted power generation amount when the predicted stored electricity amount is equal to or greater than the predetermined reference value (step S104-YES). The amount is calculated (step S105). When the application power generation amount is calculated, the communication unit 135 transmits application power generation amount data indicating the application power generation amount to an external server (step S106).

  On the other hand, when the predicted power storage amount is not greater than or equal to the reference value, that is, when the predicted power storage amount is less than the reference value (step S104-NO), the difference between the predicted power storage amount and the reference value is taken into account and the predicted power generation amount is calculated. A lower value is calculated as the applied power generation amount (step S107). When the application power generation amount is calculated, the communication unit 135 transmits application power generation amount data indicating the application power generation amount to an external server (step S106).

Next, the case where it is a consumer who does not have the electrical storage apparatus 12 is demonstrated for the comparison with the above-mentioned embodiment. Here, if the actual amount of power generation and demand is different for the application, an imbalance cost is incurred for each.
For example, in a consumer who does not have the power storage device 12, when the actual power generation amount by the solar power generation device is larger than the applied power generation amount, the imbalance can be adjusted by increasing the demand for indoor loads in the consumer. However, this will increase demand (the amount of power consumed by customers will increase). On the other hand, if the actual amount of power generated by the solar power generation device is less than the applied power generation amount, the actual power generation amount will not reach the requested power generation amount unless the weather recovers. End up.
Further, in a consumer who does not have the power storage device 12, when the actual demand is larger than the applied power generation amount, the demand for indoor loads in the consumer is reduced (no electricity is used). Although it is possible to perform imbalance adjustment, it becomes necessary for the customer to reduce demand.
Moreover, in the consumer who does not have the electrical storage apparatus 12, when the actual demand amount is small with respect to the applied power generation amount, the imbalance can be adjusted by increasing the demand for the indoor load in the consumer. This will push up demand (power consumption will increase).
As described above, in the case of a consumer who does not have a power storage device, when the generated power is not as expected due to the influence of the weather, the adjustment range is limited and the adjustment is made based on the demand of the indoor load. As a result, the burden of charges may be imposed, or the demand imbalance may be increased due to a decrease in power generation imbalance.

Next, as in the present embodiment, a consumer including the power storage device 12 will be described.
FIG. 3 is a diagram illustrating the relationship between the applied power generation amount and the charge / discharge of the power storage device 12. FIG. 3A is a graph showing an example of the relationship between the amount of power and time when the amount of power stored in the power storage device 12 is less than the reference value at the start of the period to be planned. In this figure, the vertical axis is the electric energy and the horizontal axis is the time. At time t1, the predicted power generation amount of the power storage device 12 (the part after the time t1 of reference numeral 120) is lower than the reference value, so the applied power generation amount calculation unit 132 sets a value lower than the predicted power generation amount to the applied power generation amount. Calculate as Thereby, a part of the electric power generated by the solar power generation device 10 is reversely flowed, and the remaining electric power generated is used as charging power for charging the power storage device 12. As a result, when the predicted power storage amount is smaller than the reference value, the application power generation amount is applied using a value smaller than the predicted power generation amount. When the actual power generation amount becomes smaller than the predicted power generation amount, the power control unit 133 reduces the charging power supplied to the power storage device 12 while maintaining the power to be reversely flowed. Thereby, even if it is a case where actual power generation amount becomes smaller than prediction power generation amount, since application power generation amount can be maintained, imbalance can be reduced. In addition, even when the actual power generation amount of the solar power generation device 10 is smaller than the predicted power generation amount, the power control unit 133 supplies the power storage device 12 while maintaining the power to be reversely flowed. Since the period for maintaining the applied power generation amount can be continued by reducing the charging power to be performed, control is not performed to maintain the applied power generation amount by discharging from the power storage device 12 in order to adjust the imbalance. Therefore, it is possible to reduce the possibility that the imbalance adjustment that discharges from the power storage device 12 must be performed even though the remaining power of the power storage device 12 is small. Further, since it is possible to reduce the imbalance adjustment due to the discharge even though the remaining amount of the power storage device 12 is small, the remaining amount of the power storage device 12 is discharged and the remaining amount becomes zero. In this case, the imbalance control by discharge cannot be performed any more, and the reverse power flow is lower than the applied power generation amount. According to this embodiment, the power storage amount of the power storage device 12 is There is an advantage that imbalance adjustment due to electric discharge is less likely to occur when there is little. That is, even when the actual power generation amount becomes larger than the applied power generation amount, or even when the actual power generation amount becomes smaller, the power generation device 12 is used to maintain the application power generation amount. Balance can be reduced.

In addition, at time t <b> 2, the power control unit 133 stops power supply from the solar power generation device 10 to the power storage device 12 when the amount of power stored in the power storage device 12 reaches the reference value. Stop charging. And about the electric energy in which the applied electric power generation amount exceeded the prediction electric power generation amount, it discharges from the electrical storage apparatus 12, and reverse power flow is performed along the applied electric power generation amount. Here, the power storage amount tends to decrease after time t2 because the power storage device 12 discharges a portion where the predicted power generation amount is insufficient with respect to the applied power generation amount. In this way, reverse power flow can be achieved as planned for the applied power generation amount, and imbalance can be reduced.
Here, if the amount of power stored in the power storage device 12 reaches a reference value from a value lower than the reference value by charging on the planning target day, the charging mode may not be changed to the charging mode again on that day. Alternatively, a reference value for starting charging may be provided separately from the reference value, and charging may be performed again when the amount of power stored in the power storage device 12 decreases to the reference value for starting charging.
FIG. 3B is a diagram for explaining the capacity and charge / discharge amount of the power storage device 12. The power storage device 12 has a rating in a dischargeable range and a rating in a chargeable range. At time t1, power storage device 12 performs charging in order to reduce imbalance, but performs charging within a rated charging range (a range in which overcharging is not performed). In addition, at time t2, power storage device 12 performs discharge in order to reduce imbalance, but performs discharge within a rated discharge range (a range in which overdischarge does not occur).

  FIG. 4 is a graph showing an example of the relationship between the amount of power and time when the amount of power stored in the power storage device 12 is greater than or equal to the reference value at the start of the period to be planned. In this figure, the vertical axis is the electric energy and the horizontal axis is the time. At time t11, since the predicted power generation amount of the power storage device 12 (the portion after time t11 of reference numeral 220) is larger than the reference value, the applied power generation amount calculation unit 132 sets a value larger than the predicted power generation amount to the applied power generation amount. Calculate as Thereby, in addition to the electric power generated by the solar power generation device 10, the electric power stored in the power storage device 12 is reversely flowed. As a result, when the predicted power storage amount is larger than the reference value, the application power generation amount is applied using a value larger than the predicted power generation amount. When the actual power generation amount becomes larger than the predicted power generation amount, the power control unit 133 reduces the discharge power discharged (reverse power flow) from the power storage device 12 while maintaining the power to be reverse power flow. To do. Thereby, even if the actual power generation amount is larger than the predicted power generation amount, the applied power generation amount can be maintained by controlling the discharge power, so that imbalance can be reduced. Further, even when the actual power generation amount of the solar power generation device 10 becomes smaller than the predicted power generation amount, the power control unit 133 discharges from the power storage device 12 while maintaining the power to be reversely flowed. Since the period for maintaining the applied power generation amount can be continued by increasing the discharge power to be performed, control is not performed to charge the power storage device 12 and maintain the applied power generation amount in order to adjust the imbalance. Therefore, although the remaining amount of the power storage device 12 is large, it is possible to reduce the possibility of performing an imbalance adjustment in which the power storage device 12 is further charged. In addition, when the power storage device 12 is charged and the remaining amount reaches the upper limit even though the remaining amount of the power storage device 12 is large, the battery cannot be charged any more, and the current flow exceeds the applied power generation amount. However, according to this embodiment, there is an advantage that imbalance adjustment due to charging is less likely to occur when the power storage amount of the power storage device 12 is large. That is, even if the actual power generation amount is smaller or larger than the application power generation amount, the power generation device 12 is used to maintain the application power generation amount and Balance can be reduced.

  In the above-described embodiment, the planning target period is one day, and the applied power generation amount for the next day (from 0:00 to 24:00) the next day is calculated and transmitted from the communication unit 135 on the previous day. However, the transmission timing of the applied power generation amount may be performed every 30 minutes, for example, in units of 30 minutes. When the unit is 30 minutes, the predicted amount calculation unit 131 acquires weather forecast information for a predetermined period (such as 24 hours) after the next 30 minutes, calculates the predicted power generation amount, and calculates the predicted power storage amount. calculate. Then, the applied power generation amount calculation unit 132 recalculates the applied power generation amount every 30 minutes. The communication unit 135 transmits application power generation amount data indicating the application power generation amount to an external server every time the application power generation amount is calculated.

  FIG. 6 is a diagram for explaining the relationship between the charge / discharge power and the SOC of power storage device 12. 6A and 6B, the horizontal axis represents time, the vertical axis represents charging / discharging (charging on the positive side, discharging on the negative side), and the other vertical axis represents SOC. 6A and 6B are examples in the case where imbalance control is performed from the SOC of the power storage device from approximately 0%. In FIG. 6A, the power control unit 133 charges the battery so that the SOC of the power storage device 12 does not reach 100%, and stores the power when the SOC exceeds a predetermined reference value and approaches 100%. By preferentially discharging from the device 12, it is possible to lengthen the period during which the remaining chargeable capacity remains. Thereby, even when imbalance occurs, it is possible to leave room for discharging or charging the power storage device 12 from the power storage device 12, and to reduce or eliminate the imbalance. On the other hand, FIG. 6B is a diagram illustrating a case where general control that does not have the function of this embodiment is performed. In FIG. 6B, the electric power generated by the power generation device is charged into the power storage device, and discharge is performed after the SOC of the power storage device reaches 100%. When the SOC reaches 100%, it becomes impossible to realize imbalance reduction using the power storage device.

FIG. 7 is a diagram illustrating the relationship between charge / discharge power and the SOC of power storage device 12. 7A and 7B, the horizontal axis represents time, the vertical axis represents charge / discharge (charge on the positive side, discharge on the negative side), and the other vertical axis represents SOC. FIG. 7A and FIG. 7B are examples in the case where imbalance control is performed from a state where the SOC of the power storage device remains to some extent (for example, SOC is slightly over 30%). In FIG. 7A, when the power control unit 133 is charged so that the SOC of the power storage device 12 does not become 100%, the SOC is shifted to a stage where the SOC exceeds a predetermined reference value and is charged to some extent. The charging power is maintained without increasing (symbol 700), and when it is detected that the SOC has reached about 90%, charging is stopped and surplus power is supplied to a load or the like as necessary. After that, even when it is necessary to charge the power storage device 12 in order to cancel the imbalance, the power control unit 133 stops charging when the SOC has not reached 100%. Therefore, the remaining SOC can be charged to reduce imbalance (reference numerals 710 and 720).
On the other hand, FIG. 7B is a diagram illustrating a case where general control that does not have the function of the present embodiment is performed. In FIG. 7B, the power generated by the power generation device is charged into the power storage device, and after the SOC of the power storage device reaches 100%, the charging is stopped. Even if it is going to charge the power storage device to reduce the imbalance at the time, since the SOC has already reached 100%, it cannot be charged and the imbalance can be eliminated. It will disappear.

  As described with reference to FIGS. 6 and 7, when there is a possibility that imbalance occurs in the power storage device 12, charging the power storage device 12 increases the reverse power flow. The imbalance that ends up can be eliminated. 6 and 7, the case of imbalance due to an increase in reverse power flow has been described. However, in the case of imbalance due to an increase in demand power, the imbalance can be reduced by discharging from the power storage device 12. Can be resolved.

  You may make it implement | achieve the power management apparatus 13 in embodiment mentioned above with a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be a program for realizing a part of the above-described functions, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. You may implement | achieve using programmable logic devices, such as FPGA (Field Programmable Gate Array).

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

1 Power Distribution Control System 10 Photovoltaic Generator 11 Power Conditioner (PCS)
DESCRIPTION OF SYMBOLS 12 Power storage device 13 Power management apparatus 14 Distribution board 131 Predicted amount calculation part 132 Applied power generation amount calculation part 133 Power control part 134 Storage part 135 Communication part

Claims (6)

A predicted amount calculation unit that calculates a predicted power generation amount that is a predicted value of the power generation amount by the power generation device and a predicted power storage amount that is a prediction value of the power storage amount of the power storage device in the period to be planned;
An applied power generation amount calculation unit that calculates an applied power generation amount in the period to be planned based on the predicted power generation amount and the predicted power storage amount. When the predicted power generation amount is equal to or greater than a predetermined reference value, the application power generation amount calculation unit adds at least a part of the remaining amount of the predicted power storage amount to the prediction power generation amount as the application power generation amount. The power management apparatus according to claim 1 to calculate. When the predicted power generation amount is less than a predetermined reference value, the application power generation amount calculation unit applies a value lower than the predicted power generation amount according to a difference between the predicted power storage amount and the reference value. The power management device according to claim 1, wherein the power management device is calculated as a power generation amount. The power management apparatus according to any one of claims 1 to 3, further comprising: a transmission unit configured to transmit application power generation amount data indicating the application power generation amount in the calculated period to be planned to an external device. If there is a difference between the applied power generation amount and the actual value of the power generation amount by the power generation device, a part of the power generated by the power generation device is transferred to the power storage device according to the difference. The power management device according to any one of claims 1 to 4, further comprising: a power control unit that supplies and charges or generates power from the power storage device. A method for calculating an applied power generation amount in a power management device, comprising:
The predicted amount calculation unit calculates a predicted power generation amount that is a predicted value of the power generation amount by the power generation device and a predicted power storage amount that is a prediction value of the power storage amount of the power storage device in the period to be planned,
The applied power generation amount calculation method, wherein the applied power generation amount calculation unit calculates the applied power generation amount in the period to be planned based on the predicted power generation amount and the predicted power storage amount.

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