JP2014131478A - Power management device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power management device and a program that suppress power usage within contract power even if using a storage battery which has an insufficient power storage capacity or using control means which cannot ensure immediacy of demand control.SOLUTION: When electricity usage measured by a power measurement section 36 becomes equal to or higher than a predetermined threshold, a discharge control section 41b of a power monitoring device 40 discharges a storage battery 1 to feed electric equipment, so that the discharge from the storage battery 1 compensates for the excess over the threshold. When a power storage level of the storage battery 1 becomes lower than a predetermined level as the storage battery 1 is discharged, the discharge control section 41b of the power monitoring device 40 computes an available discharge time to discharge the storage battery 1, and an equipment control section 41a of the power monitoring device 40 executes power suppression control on the electric equipment to lower the electricity usage below the threshold within the available discharge time.

Description

  The present invention relates to a power management apparatus and a program.

  Since the electricity bill paid by the power consumer is determined based on the maximum demand power throughout the year, it is necessary to reduce the maximum demand power in order to suppress the electricity bill. Therefore, on the power consumer side, demand control is performed such that the amount of power used is suppressed and the amount of power used is equal to or less than the contracted power amount. Electrical devices that are subject to demand control are devices that are used to improve comfort and that do not interfere with temporarily stopping or suppressing operation. The air conditioner is the control target.

  Here, if the power usage is likely to exceed the contracted power, it is necessary to perform demand control in a shorter time as the power usage is larger. When electrical devices controlled by wireless communication are targeted for demand control, the immediacy of control time is not guaranteed in such a control method, so demand control may not be in time, and power usage may exceed contract power. there were. In addition, if the amount of power used exceeds the contracted power due to overcurrent, etc., the ampere breaker may operate and a total power outage may occur.

  Therefore, a power supply system has been proposed in the past that suppresses the input power from the commercial power supply system below the contract power by discharging the storage battery and feeding the electrical equipment when the power usage exceeds a predetermined amount. (For example, refer to Patent Document 1). In this power supply system, when the power consumption exceeds a predetermined threshold value, the storage battery is discharged and the remaining amount of the storage battery is informed to promote demand control by the user. Further, when the remaining amount of the storage battery falls below a predetermined amount, demand control of a predetermined electric device is started so that the power consumption does not exceed the contract power.

JP 2008-67439 A

  In the power supply system disclosed in the above document, the storage battery starts discharging when the power usage exceeds a threshold value, but demand control is not performed until the remaining capacity of the storage battery falls below a predetermined amount. It is necessary to use a larger one. In addition, demand control is started when the remaining amount of storage battery falls below a predetermined amount, and power consumption must be suppressed before the remaining amount of storage battery runs out. There is a possibility that the required control means cannot cope. Therefore, an electric device that cannot guarantee immediacy (for example, an electric device controlled via a network or an infrared remote controller) cannot be a control target for demand control.

  The present invention has been made in view of the above problems, and the object of the present invention is that even when a storage battery with insufficient storage capacity is used or when control means that does not guarantee immediacy in demand control is used An object of the present invention is to provide a power management apparatus and program capable of suppressing the usage amount within contract power.

  The power management apparatus of the present invention includes a device control unit and a discharge control unit. The device control unit performs power suppression control that suppresses the amount of electricity used by at least one electrical device. The discharge control unit controls discharge from the storage battery. When the amount of electricity used measured by the measuring unit that measures the amount of electricity used by the electric device exceeds a predetermined threshold, the discharge control unit discharges the storage battery and supplies power to the electric device. When the remaining amount of electricity detected by the remaining amount detection unit that detects the remaining amount of electricity stored in the storage battery becomes less than a predetermined amount during the discharge of the storage battery, the discharge control unit obtains a dischargeable time that can be discharged from the storage battery. The device control unit performs the power suppression control so that the amount of electricity used falls below the threshold within the dischargeable time.

  In this power management apparatus, it is also preferable that there are a plurality of types of control targets for the power suppression control, and the device control unit changes the control target for executing the power suppression control according to the dischargeable time.

  In this power management apparatus, when the device control unit executes the power suppression control for a part of the control target, the discharge control unit measures the amount of electricity used by the measurement unit after executing the power suppression control. It is also preferable to obtain the dischargeable time again based on the remaining power storage amount detected by the remaining amount detection unit.

  In the power management apparatus, when the dischargeable time is shorter than a predetermined threshold time, the device control unit is configured to perform a plurality of the power consumption so that the amount of electricity used is reduced below the threshold by one power suppression control. It is also preferable to execute the power suppression control for a control target at a time.

  In this power management apparatus, the measuring unit measures the amount of electricity used for each electric device, and the device control unit is based on the amount of electricity used for each electric device measured by the measuring unit, Selecting a plurality of control targets as a plurality of control targets for executing the power suppression control at a time so that the total amount of electricity used by the plurality of control targets exceeds the threshold value Is also preferable.

  In the power management apparatus, the discharge control unit may be configured to operate the electric device by discharging from the storage battery until the amount of electricity used falls below the threshold after the power suppression control is started. It is also preferable that the predetermined amount is set to be equal to or greater than the minimum remaining amount.

  In this power management apparatus, it is preferable that the power management apparatus further includes a notification unit that notifies that the amount of electricity used measured by the measurement unit is equal to or greater than the threshold and notifies the dischargeable time.

  The program of the present invention causes a computer to function as device control means for performing power suppression control for suppressing the amount of electricity used by at least one electric device and discharge control means for controlling discharge from the storage battery. The program according to the present invention causes the discharge control unit to discharge from the storage battery and supply power to the electrical device when the electrical usage amount measured by the measuring unit that measures the amount of electricity used by the electrical device exceeds a predetermined threshold. To execute the process. The program according to the present invention allows the discharge control means to discharge from the storage battery when the remaining battery charge detected by the remaining battery detection unit for detecting the remaining battery charge of the storage battery is less than a predetermined amount when the storage battery is discharged. A process for obtaining a dischargeable time is executed, and the device control unit is caused to execute the power suppression control so that the amount of electricity used falls below the threshold within the dischargeable time.

  According to the present invention, when the amount of electricity used is less than a predetermined amount when the remaining amount of electricity is less than a predetermined amount, the discharge control unit discharges from the storage battery and supplies power to the electric device, and the device control unit can discharge The power suppression control is executed so that the amount of electricity used falls below the threshold within the time. Therefore, even when a storage battery with a relatively small storage capacity is used or a control means with low immediacy is used as the device control unit, the power suppression control can be reliably completed before the remaining storage capacity is exhausted. Therefore, it is possible to avoid a situation where the ampere breaker is activated when the amount of electricity used exceeds the contract power.

It is a block diagram which shows the principal part of the power management apparatus of this embodiment. It is a system configuration figure of a power management system using a power management device of this embodiment. It is a flowchart explaining operation | movement of the power management apparatus of this embodiment.

  Below, the embodiment which applied the power management device concerning the present invention to the power distribution system of a detached house is described based on a drawing. In addition, although embodiment which applied this invention to a detached house below is described, it does not prevent applying this invention to an apartment house.

  FIG. 2 is a system configuration diagram of the power distribution system. This power distribution system includes a storage battery 1, a solar battery 2, a power conversion unit 10, a DC distribution board 20, an AC distribution board 30, a power monitoring device 40 (power management device), and an infrared remote control device 50. The display panel 60 is provided as a main component. In this embodiment, the solar battery 2 is provided as a power source for charging the storage battery 1, but a power source such as a wind power generation facility or a fuel cell may be provided.

  The AC distribution board 30 houses a main breaker 31, a plurality of branch breakers 32, an interconnection breaker 33, and a sensor unit 34 in the board. Connected to the primary side of the main breaker 31 is a power line L1 of a system power source that is drawn into the house from outside the house via the lead-in panel 70. The primary side of the branch breaker 32 is connected to the secondary side wiring of the main breaker 31, and turns on / off the power supply to the AC load (electrical device) 35 connected to the secondary side. The interconnection breaker 33 has a function of connecting or disconnecting a distributed power source (for example, the solar cell 2) in the home to the system power source. The sensor unit 34 detects an input current and an input voltage that are input via the main breaker 31. The power measurement unit 36 (measurement unit) measures the input power from the system power supply based on the input current and the input voltage detected by the sensor unit 34, and the measurement result of the input power is measured by, for example, a specific low power radio. Wireless transmission to the monitoring device 40. In the present embodiment, the sensor unit 34 is provided only in the main breaker 31 and the input power is measured. However, the sensor unit 34 may be provided on the secondary side of the branch breaker 32, and the branch circuit may be provided by the power measurement unit 36. You may measure the amount of electricity used for each.

  The DC distribution board 20 houses a main breaker 21 and a plurality of branch breakers 22 in the board. A DC power line from the power conversion unit 10 is connected to the primary side of the main breaker 21, and a DC voltage having a predetermined voltage value is supplied from the power conversion unit 10. The primary side of the branch breaker 22 is connected to the secondary side wiring of the main breaker 21, and turns on / off the power supply to the DC load 23 connected to the secondary side.

  The power conversion unit 10 includes a PV (Photovoltaic) DC / DC converter 11, a charge / discharge DC / DC converter 12, a power supply DC / DC converter 13, an inverter 14, and a control unit 15.

  The control unit 15 includes a wireless communication interface (for example, a specific low power wireless) that performs wireless communication with the power monitoring device 40, and each of the DC / DC converters 11 to 13 according to a control signal from the power monitoring device 40. And the operation of the inverter 14 is controlled.

  The PV DC / DC converter 11 converts the power generated by the solar cell 2 into DC power having a predetermined voltage value, and the charge / discharge DC / DC converter 12, the power supply DC / DC converter 13 or the inverter via the internal wiring L 2. 14 to output.

  The charging / discharging DC / DC converter 12 has a function of controlling charging / discharging of the storage battery 1. When charging the storage battery 1, the DC / DC converter 12 charges the storage battery 1 by converting the current value and voltage value of the DC power input from the PV DC / DC converter 11 into current and voltage suitable for charging. When the storage battery 1 is discharged, the DC / DC converter 12 converts the input from the storage battery 1 into a predetermined voltage value and supplies it to the power supply DC / DC converter 13 or the inverter 14.

  The power supply DC / DC converter 13 converts the DC power input from the PV DC / DC converter 11 or the charge / discharge DC / DC converter 12 into a predetermined voltage value suitable for the DC load 23 to generate a DC distribution. The board 20 is supplied.

  The inverter 14 converts the DC power input from the PV DC / DC converter 11 or the charge / discharge DC / DC converter 12 through the internal wiring L2 into an alternating current (for example, AC 100V) and supplies the alternating current to the alternating current distribution board 30. To do.

  The storage battery 1 stores the surplus power generated by the solar battery 2. When the amount of electricity used is equal to or greater than a predetermined threshold, the storage battery 1 is discharged and converted into alternating current, and is connected to the system power supply to supply power to the alternating current load.

  Next, the power monitoring apparatus 40 will be described with reference to the block diagram of FIG. The power monitoring apparatus 40 includes an arithmetic processing unit 41, a wireless communication interface (wireless communication I / F) 42 including, for example, a specific low-power radio, a display control unit 43, and a memory 44.

  The arithmetic processing unit 41 is composed of, for example, a microcomputer, and a device control unit 41a and a discharge control unit 41b are configured by the calculation function of the microcomputer. The device control unit 41a performs power suppression control (demand control) of the electric devices 35a and 35b when the power usage amount increases. Further, the discharge control unit 41 b controls the discharge from the storage battery 1 using the power conversion unit 10.

  The wireless communication interface 42 performs wireless communication with the power conversion unit 10, the power measurement unit 36, and the infrared remote control device 50 described above. When the electrical device 35a does not have a wireless communication function but has only an infrared communication function, the power monitoring device 40 wirelessly transmits a control signal from the wireless communication interface 42 to the infrared remote control device 50. The infrared remote control device 50 transmits the control signal received from the power monitoring device 40 to the electrical device 35a as an infrared signal, and the control signal from the power monitoring device 40 is wirelessly relayed by the infrared remote control device 50. Further, when the electrical device 35b itself has a wireless communication function, the power monitoring device 40 directly transmits a wireless signal from the wireless communication interface 42 to the electrical device 35b.

  The display control unit 43 controls the display content of the display panel 60 as a notification unit in accordance with the display control signal input from the arithmetic processing unit 41.

  Next, the operation of this power management apparatus will be described.

  When the solar cell 2 generates power by sunshine, the PV DC / DC converter 11 performs MPPT (Maximum Power Point Tracking) control and the like to take out electric power from the solar cell 2. When power is consumed by the DC load 23 and the AC load 35, the output of the PV DC / DC converter 11 is output to the DC / DC converter 13 and the inverter 14. In the DC / DC converter 13, the output of the PV DC / DC converter 11 is converted into a voltage suitable for the DC load 23 and supplied to the DC load 23 via the DC distribution board 20. Further, the inverter 14 converts the output of the PV DC / DC converter 11 into a stable AC power supply (for example, AC 100 V) and outputs it to the AC distribution board 30, and supplies power to the AC load 35 in connection with the system power supply. .

  Here, when the generated power of the solar cell 2 exceeds the power consumed by the load (the DC load 23 and the AC load 35), in this system, the surplus generated power (surplus power) is used as the AC power supply system. The storage battery 1 is charged instead of selling power by reverse tide. That is, in the power conversion unit 10, when surplus power is generated in the solar battery 2, the charging / discharging DC / DC converter 12 performs a charging operation to charge the storage battery 1. If the power consumption at the AC load 35 exceeds the power supplied from the power conversion unit 10, the shortage is supplied from the system power supply.

  In this way, in this system, if the power consumption at the AC load 35 exceeds the supply from the solar cell 2, the shortage is purchased from the commercial AC power source. When exceeds the contracted power, the ampere breaker is activated and a complete power failure occurs. Therefore, when the amount of purchased electric power (electricity consumption) is equal to or greater than a threshold set to a value slightly lower than the contracted electric energy, power suppression control is performed to suppress the electricity usage of the electrical device. . Here, the operation | movement of the electric power suppression control by the electric power monitoring apparatus 40 is demonstrated based on the flowchart of FIG.

  The power measurement unit 36 measures the power usage from the output of the sensor unit 34 at a predetermined sampling interval, and wirelessly transmits the measurement result of the power usage (electric usage) to the power monitoring device 40 (S1). .

  In the power monitoring apparatus 40, when the wireless communication I / F 42 takes in the measurement result of the power usage amount wirelessly transmitted from the power measurement unit 36, the arithmetic processing unit 41 determines the level of the measurement result of the power usage amount and a predetermined threshold value. Compare (S2). Here, the threshold value is set to a slightly lower power amount than the contract power amount with the electric power company.

  If the measurement result of the power consumption is less than the threshold value in S2 (No in S2), the process returns to S1 and the measurement of the power usage is continued. On the other hand, if the measurement result of the power consumption is equal to or greater than the threshold (Yes in S2), the discharge control unit 41b of the arithmetic processing unit 41 converts the discharge command for discharging the stored amount of the storage battery 1 from the wireless communication I / F 42 to the power conversion. Transmit to unit 10. When receiving the discharge command from the power monitoring device 40, the control unit 15 of the power conversion unit 10 operates the charging / discharging DC / DC converter 12 and the inverter 14 to convert the DC power discharged from the storage battery 1 into AC. Then, the AC load 35 is fed with the system power supply (S3). In this way, when the amount of electricity used exceeds the threshold, the amount of use exceeding the threshold is discharged from the storage battery 1, so that the amount of electricity used is within the threshold while the storage battery 1 is discharged and power is supplied to the AC load 35. It can be suppressed. Therefore, the power consumption does not exceed the contracted power amount during this period, and the ampere breaker does not operate due to an overcurrent state, so that no total power failure occurs. Here, the operation in which the storage battery 1 is discharged when the amount of electricity used exceeds the threshold value and is connected to the system power supply to supply the electric device 35 is referred to as “peak assist”.

  In addition, the storage battery 1 includes a remaining amount detection unit (not shown) that detects the remaining amount of electricity stored, and the remaining amount of electricity detected at a predetermined time interval during discharge is sent to the control unit 15 of the power conversion unit 10. When the control unit 15 of the power conversion unit 10 receives the remaining battery power data from the storage battery 1, the controller 15 wirelessly transmits the remaining battery power data to the power monitoring device 40. In the power monitoring device 40, when the wireless communication I / F 42 receives the remaining power amount data transmitted from the power conversion unit 10, the arithmetic processing unit 41 receives the remaining power amount received by the wireless communication I / F 42 and the memory 44. The height is compared with the predetermined amount stored in (S4).

  Here, if the remaining amount of power storage is equal to or greater than the predetermined amount (Yes in S4), the arithmetic processing unit 41 determines a time (dischargeable time) that can be backed up by the storage battery 1 based on the remaining power storage amount and the amount of power used. Ask. And in the arithmetic processing part 41, while notifying that the electric usage-amount became more than a threshold value using the display control part 43, after displaying this dischargeable time on the display panel 60 (notification part) (S5). Returning to S4, monitoring of the remaining amount of power storage is continued. The means for notifying the dischargeable time is not limited to the screen display by the display panel 60, and the dischargeable time may be notified by voice using voice notification means such as a voice synthesis IC or a speaker. .

  On the other hand, if the remaining power storage amount is less than the predetermined amount in S4 (No in S4), the device control unit 41a of the arithmetic processing unit 41 issues a control command for executing power suppression control of the electrical device 35 to be controlled to the wireless communication I. / F42 is wirelessly transmitted to start power suppression control (S6).

  Here, the discharge control unit 41b obtains the dischargeable time based on the remaining power storage amount and the power usage amount, and the device control unit 41a controls the power suppression so that the power usage amount falls below the threshold within the dischargeable time. The control command is output. For example, when the remaining amount of electricity stored is 16.7 Wh, the threshold power is 5 kW, and the amount of power used is 6 kW, the dischargeable time for which the amount exceeding the threshold (1 kW) is covered by the remaining amount of electricity stored in the storage battery 1 is 16.6 (Wh) / It is calculated as 1 (kW) ≈60 (seconds). Therefore, the device control unit 41a outputs a control command so as to complete the power suppression control within 60 seconds. The control command for power suppression control transmitted from the wireless communication I / F 42 is transmitted to the electric device 35a having only the infrared communication function via the infrared remote controller 50, and directly transmitted to the electric device 35b having the wireless communication function. Is done. The electric devices 35a and 35b that have received the control command for the power suppression control execute the power suppression control by stopping the operation or switching to an operation state with lower power consumption.

  In addition, when performing power suppression control, priorities are set for a plurality of electric devices to be controlled, and the electric devices in descending order of priority are used until the electric usage is less than the threshold. You may make it perform electric power suppression control. For example, as shown in Table 1, when priority is assigned to three electric devices, ie, a living air conditioner, a living floor heating, and a Japanese-style air conditioner that are subject to power suppression control, the order of living air conditioner → living floor heating → Japanese-style air conditioner Thus, power suppression control is performed until the amount of electricity used falls below the threshold value. In this case, since the power suppression control is executed in order from the electrical device having a lower degree of necessity than the case where the power suppression control is performed on a plurality of electrical devices to be controlled at a time, the electrical device that performs the power suppression control is minimized. Can be limited.

  After starting the power suppression control in S6, the arithmetic processing unit 41 of the power monitoring device 40 monitors the power usage amount transmitted from the power measurement unit 36, and even if the storage battery 1 stops discharging, the power usage is continued. It is determined whether or not the amount falls below the threshold (S7). Here, when the power suppression control is not completed and the storage battery 1 stops discharging, the arithmetic processing unit 41 continues discharging from the storage battery 1 while the amount of power used becomes equal to or greater than the threshold (No in S7). On the other hand, if the power suppression control is completed and the storage battery 1 stops discharging, and the power consumption is less than the threshold (Yes in S7), the device control unit 41a of the arithmetic processing unit 41 ends the power suppression control. The command is wirelessly transmitted from the wireless communication I / F 42. The discharge control unit 41b of the arithmetic processing unit 41 wirelessly transmits a control command for terminating the discharge of the storage battery 1 from the wireless communication I / F 42 (S8). At this time, when receiving the control command for ending the power suppression control, the electric devices 35a and 35b that have been performing the power suppression control end the power suppression operation and return to the operation state before the power suppression control is executed. . Moreover, the control part 15 of the power conversion unit 10 receives the control command which stops discharge, and stops the discharge from the storage battery 1. FIG. Therefore, when the amount of electricity used is suppressed by the power suppression control until it becomes less than the threshold value, the termination control of the power suppression control and the control for terminating the discharge from the storage battery 1 are automatically performed.

  In the present embodiment, as a result of executing the power suppression control, when the amount of electricity used falls below a threshold value, the power suppression control of a plurality of electrical devices is terminated simultaneously, but a plurality of electrical devices 35 are set in advance. You may make it return from electric power suppression control in order according to a priority. Further, as a result of executing the power suppression control, it is not necessary to automatically end the power suppression control of each electrical device 35 when the amount of electricity used falls below the threshold value, and the power suppression control is terminated by the user's end operation. You may make it do.

  In S5 of FIG. 3, the dischargeable time is notified by text or voice, but after notifying the dischargeable time and before starting the power suppression control, the customer himself / herself waits for the operation of stopping the electric device. Also good. Further, when notifying the dischargeable time, even if the storage battery 1 stops discharging, a specific measure for keeping the amount of electricity used below the threshold value may be notified to the consumer. For example, present the specific measures such as “Please stop the IH cooking appliance within 3 minutes” or “Please stop charging the electric vehicle within 10 minutes” to stop the electric device 35 that stops the operation. You may let the customer himself choose. In this case, there is no need to provide load interrupting means for circuits with a large amount of electricity used, such as IH cooking utensils and electric vehicle charging outlets, and the cost of providing load interrupting means for circuits through which a large current flows can be reduced. .

  As described above, in the power monitoring system of the present embodiment, when the amount of electricity used measured by the power measuring unit 36 exceeds a predetermined threshold, the discharge control unit 41b discharges from the storage battery 1 and the electric devices 35a and 35b. Power to Further, when the remaining amount of electricity stored in the storage battery 1 becomes less than a predetermined amount during discharging from the storage battery 1, the discharge control unit 41b obtains a dischargeable time during which the storage battery 1 can be discharged, and the device control unit 41a uses the electricity within the dischargeable time. The power suppression control is executed so that the amount falls below the threshold.

  As a result, even when the storage battery 1 having a relatively small storage capacity is used, or when control means with low immediacy (for example, control means such as wireless control, infrared remote control or network control) is used as the device control unit 41a, The power suppression control can be reliably completed before the remaining amount is exhausted. Therefore, it is possible to avoid a situation where the ampere breaker is activated when the amount of electricity used exceeds the contracted power, and the electricity bill can be reduced.

  By the way, when there are a plurality of types of control targets for the power suppression control, it is also preferable that the device control unit 41a changes the control target for the power suppression control to be executed in accordance with the dischargeable time.

  For example, when the remaining storage amount of the storage battery 1 is 16.6 Wh, the threshold value is 5 kW, and the power consumption is 6 kW, the time that the threshold value is exceeded (= 1 kW) can be covered by the discharge from the storage battery 1 (dischargeable time) is 16 .6 (Wh) ÷ 1 (kW) ≈60 (seconds). Therefore, it is necessary to complete the power suppression control within 60 seconds of the dischargeable time. Here, it is assumed that the power suppression control can be performed for each individual electric device, and the living air conditioner having high immediacy and high power consumption is first turned off according to the priority order. When the off control of the living air conditioner is completed, the excess power amount is reduced to 0.3 kW. Moreover, since it took 30 seconds to turn off the living air conditioner, the remaining amount of electricity stored in the storage battery 1 is reduced to 8.3 kW. Here, when the energization possible time by the storage battery 1 is recalculated, it becomes 8.3 (Wh) ÷ 0.3 (kW) ≈100 (seconds). Therefore, the second priority of the floor heating off control is 100. It can be done within seconds.

  In this way, by performing power suppression control of an electrical device with relatively high immediacy and high power consumption first, it is possible to further extend the energization possible time, and for electrical devices with relatively low immediacy in terms of time It becomes possible to perform power suppression control with a margin.

  In addition, when the device control unit 41a performs power suppression control for a part of the control target, the discharge control unit 41b transmits the power usage measured by the power measurement unit 36 and the storage battery 1 after execution of the power suppression control. The dischargeable time is obtained again based on the stored remaining power. When the power suppression control is executed for some control targets, the dischargeable time changes accordingly. Therefore, by obtaining the dischargeable time again after executing the power suppression control, if the dischargeable time is extended, there is a margin. Then, the subsequent power suppression control can be executed.

  In addition, as described above, when there is a comparatively sufficient dischargeable time, it is sufficient to turn off the electrical devices in order according to priority. However, there is no dischargeable time and the dischargeable time is a predetermined threshold time. If shorter, it is necessary to turn off a plurality of electrical devices with one power suppression control and reduce the amount of electricity used to a threshold value or less. In this case, it is necessary to determine which electrical device should be turned off in order to reduce it to the threshold value or less by one power suppression control. Therefore, a sensor unit 34 is provided for each branch circuit, and the power measurement unit 36 measures the power usage amount for each branch circuit based on the detection result of the sensor unit 34. Then, in the device control unit 41a, if the number of electrical devices is controlled to be off (power suppression control) according to the priority order of each electrical device based on the power usage amount of each electrical device, the total power usage amount Can be completed within the dischargeable time even if there is no allowance for the dischargeable time.

  As described above, when the dischargeable time is shorter than the predetermined threshold time, the device control unit 41a performs power suppression control for a plurality of control targets so that the amount of electricity used decreases below the threshold in one power suppression control. Is executed at a time, the amount of electricity used can be reduced below the threshold in a short time.

  In the above example, the amount of electricity used is suppressed to less than the threshold by stopping a plurality of electric devices at a time from the higher priority, but for each branch circuit measured by the power measuring unit 36, that is, Based on the amount of electricity used for each electrical device, as a plurality of electrical devices that execute power suppression control at a time, the total amount of electricity used by these multiple electrical devices exceeds the threshold that exceeds the threshold. In addition, a plurality of electrical devices may be selected. In this way, by selecting the electric devices that execute the power suppression control at a time, when the electric usage amount is equal to or greater than the threshold value, the selected electric devices are stopped at a time, thereby reducing the electric usage amount. The excess can be reduced, and the amount of electricity used can be reliably suppressed below the threshold.

  In the above example, when the amount of electricity used is equal to or greater than the threshold, the amount of electricity used is reduced below the threshold by stopping a plurality of selected electric devices at a time. When a plurality of operation modes with different power consumptions are provided, the amount of electricity used may be suppressed to be less than a threshold by switching the selected plurality of electric devices to an operation mode with less power consumption. In this case, the arithmetic processing unit 41 of the power monitoring device 40 stores, in the memory 44, the result of the power measurement unit 36 measuring the power consumption in each operation mode for each electrical device. When the amount of electricity used is equal to or greater than the threshold, the device control unit 41a can reduce electricity usage by switching the operation mode to the low power side based on the power consumption in each operation mode of each electrical device stored in the memory 44. An amount is obtained for each electric device, and a plurality of electric devices are selected so that the total amount of reduction of the electric usage exceeds the threshold value. And the apparatus control part 41a reduces the excess of an electric usage-amount by switching the selected several electric equipment to the low power consumption mode at once, and suppresses an electric usage-amount less than a threshold value reliably. be able to. The arithmetic processing unit 41 stores the power consumption (design value) in each operation mode in advance in the memory 44 instead of storing in the memory 44 the value actually measured in each operation mode for each electrical device. You may keep it. Further, instead of storing the power consumption in each operation mode for each electric device in the memory 44, the memory reduces the amount of electricity used (actual value or design value) that is reduced by switching the operation mode to the low power side. 44, and an electric device that switches the operation mode to the low power side may be selected in order to suppress the total value of the electricity usage to a threshold value or less based on these data.

  As described above, the power suppression control can be reliably completed within the dischargeable time by changing the control target for executing the power suppression control according to the dischargeable time of the storage battery 1.

  In the present embodiment, when the amount of electricity used is equal to or greater than the threshold value, the storage battery 1 is discharged. After that, the power suppression control is started when the remaining power storage amount is less than the predetermined amount, but the power suppression control is completed for the predetermined amount. It is necessary to set the value so that the remaining amount of electricity does not become zero by the time. Here, in the arithmetic processing unit 41 of the power monitoring device 40, the remaining amount of power that can operate the electric device by discharging from the storage battery 1 is minimized until the amount of electricity used falls below the threshold value after the power suppression control is started. It is also preferable to obtain the remaining amount and set the predetermined amount above the minimum remaining amount.

  For example, if the threshold power is 5 kW, the peak value of the amount of electricity used by the electrical device is 7 kW, and the time until the power suppression control is completed is 30 seconds at the longest, 2 kW of excess power is discharged from the storage battery 1 for 30 seconds. The necessary remaining power storage amount is 2 (kW) × 30 (seconds) ≈16.7 (Wh). Therefore, if the predetermined amount is set to 16.7 Wh or more, the remaining amount of power storage does not become zero during the power suppression control. The peak value of the electricity usage may be stored in the memory 44 as the maximum value of the past electricity usage, and a predetermined amount may be calculated from this value, the threshold power and the set value of the control time. A predetermined amount may be set based on the set peak electricity consumption.

  In this way, if the minimum remaining amount is determined so that the remaining power of the storage battery does not become zero during execution of the power suppression control, and the value equal to or greater than the minimum remaining amount is set as the predetermined amount, Between the start of the suppression control and the completion of the power suppression control, the remaining amount of power storage does not become zero, and the amount of electricity used does not exceed the contract power and does not cause a total power outage.

  The power management system of the present embodiment includes a plurality of electric devices, a measurement unit, a device control unit, a storage battery, a remaining amount detection unit, and a discharge control unit. The measuring means measures the amount of electricity used by a plurality of electric devices. The device control means performs power suppression control that suppresses the amount of electricity used by at least one electrical device. The storage battery is connected to the system power supply and supplies electric power to the electrical equipment. The remaining amount detecting means detects the remaining amount of electricity stored in the storage battery. The discharge control means controls the discharge from the storage battery. Further, when the amount of electricity used measured by the measuring means becomes equal to or greater than a predetermined threshold, the discharge control means discharges from the storage battery and supplies power to the electrical equipment. When the remaining amount of storage detected by the remaining amount detecting means at the time of discharging the storage battery becomes less than a predetermined amount, the discharge control means obtains the dischargeable time that can be discharged from the storage battery, and the device control means uses the electricity within the dischargeable time. Power suppression control is performed so that the amount falls below the threshold.

  In this power management system, there are a plurality of types of control targets for power suppression control, and the device control means preferably changes the control target for executing power suppression control in accordance with the dischargeable time.

  In this power management system, when the device control means executes power suppression control for a part of the control object, the discharge control means performs the power consumption control and the remaining amount detection means measured by the measurement means after execution of the power suppression control. It is also preferable to obtain the dischargeable time again based on the remaining amount of electricity stored detected in (1).

  In this power management system, when the dischargeable time is shorter than the predetermined threshold time, the device control means suppresses power for a plurality of control objects so that the amount of electricity used decreases below the threshold in one power suppression control. It is also preferable to execute the control at a time.

  In this power management system, the measuring means measures the amount of electricity used for each electric device, and the device control means performs power suppression control once based on the amount of electricity used for each electric device measured by the measuring means. It is also preferable to select a plurality of control objects as a plurality of control objects to be executed so that the total amount of electricity used by the plurality of control objects is equal to or more than the excess exceeding the threshold.

  In this power management system, the discharge control means obtains, as a minimum remaining amount of power that can operate the electric device by discharging from the storage battery until the amount of electricity used falls below the threshold after the power suppression control is started. It is also preferable to set the predetermined amount above the minimum remaining amount.

  In this power management system, it is also preferable to provide notifying means for notifying that the amount of electricity used measured by the measuring means has become equal to or greater than a threshold and notifying the dischargeable time.

DESCRIPTION OF SYMBOLS 1 Storage battery 10 Power conversion unit 15 Control part (residual amount detection part)
35a, 35b Electrical equipment 36 Electric power measurement unit (measurement unit)
40 Power monitoring device (power management device)
41a Device control unit (device control means)
41b Discharge control unit (discharge control means)

Claims (8)

A device control unit that performs power suppression control that suppresses the amount of electricity used by at least one electrical device;
A discharge control unit for controlling discharge from the storage battery,
When the electrical usage measured by the measurement unit that measures the electrical usage by the electrical device is equal to or greater than a predetermined threshold, the discharge control unit is discharged from the storage battery to supply power to the electrical device,
When the remaining amount of electricity detected by the remaining amount detection unit that detects the remaining amount of electricity stored in the storage battery becomes less than a predetermined amount during the discharge of the storage battery, the discharge control unit obtains a dischargeable time that can be discharged from the storage battery. The device control unit performs the power suppression control so that the amount of electricity used falls below the threshold within the dischargeable time.   The power management according to claim 1, wherein there are a plurality of types of control targets for the power suppression control, and the device control unit changes a control target for executing the power suppression control according to the dischargeable time. apparatus.   When the device control unit executes the power suppression control with respect to a part of the control target, the discharge control unit measures the amount of electricity used and the remaining amount detection unit measured by the measurement unit after executing the power suppression control. The power management apparatus according to claim 2, wherein the dischargeable time is obtained again based on the remaining power storage amount detected in step 3.   When the dischargeable time is shorter than a predetermined threshold time, the device control unit performs the power suppression for a plurality of the control objects such that the amount of electricity used decreases below the threshold by one power suppression control. The power management apparatus according to claim 2, wherein the control is executed at a time.   The measuring unit measures the amount of electricity used for each electric device, and the device control unit performs the power suppression control once based on the amount of electricity used for each electric device measured by the measuring unit. A plurality of control objects are selected as a plurality of control objects to be executed in such a manner that the total amount of electricity used by the plurality of control objects is equal to or greater than an excess exceeding the threshold value. 4. The power management apparatus according to 4.   The discharge control unit obtains, as a minimum remaining amount of power that can operate the electric device by discharging from the storage battery until the amount of electricity used falls below the threshold after the power suppression control is started. 6. The power management apparatus according to claim 1, wherein the predetermined amount is set to be equal to or greater than the minimum remaining amount.   7. The system according to claim 1, further comprising a notification unit that notifies that the amount of electricity used measured by the measurement unit is equal to or greater than the threshold and notifies the dischargeable time. The power management apparatus described. Computer
Device control means for performing power suppression control for suppressing the amount of electricity used by at least one electric device;
Function as a discharge control means for controlling the discharge from the storage battery,
When the electricity usage measured by the measuring unit that measures the electricity usage by the electrical device is equal to or greater than a predetermined threshold, the discharge control unit causes the battery to discharge from the storage battery and to supply power to the electrical device,
When the remaining amount of electricity detected by the remaining amount detection unit that detects the remaining amount of electricity stored in the storage battery becomes less than a predetermined amount when the storage battery is discharged, the discharge control means obtains a dischargeable time that can be discharged from the storage battery. A program that executes processing and causes the device control unit to execute the power suppression control so that the amount of electricity used falls below the threshold within the dischargeable time.

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