JP6452071B2 - Power control apparatus, power control system, and power control method - Google Patents

Description

  The present invention relates to a power control apparatus and the like that select one of a charge priority operation and a power sale priority operation for each operation target period.

  Conventionally, a system for controlling a power storage device has been proposed. The technique described in Patent Document 1 is an example. Specifically, the energy management system described in Patent Document 1 creates a charge / discharge schedule for a power storage device based on a demand prediction value and a power generation amount prediction value in an environment including the power generation device and the power storage device. The power storage device is controlled based on the discharge schedule. Thereby, the energy management system can operate the power storage device under an advantageous charge / discharge strategy.

JP 2014-174735 A

  However, one of the charging operation for charging the power storage device with the surplus power of the generated power relative to the demand power and the power selling operation for outputting the surplus power of the generated power with respect to the demand power as the sold power to the power system is appropriately selected. It is not easy. Then, if one of the charging operation and the power selling operation is selected by mistake, the effective use of surplus power may be hindered.

  Then, an object of this invention is to provide the power control apparatus etc. which can support the effective utilization of surplus electric power appropriately.

  In order to achieve the above object, a power control apparatus according to an aspect of the present invention provides a surplus power more than a power selling operation in which surplus power excluding demand power out of generated power of a distributed power source is output to a power system as sold power. A charge priority operation that prioritizes a charge operation that charges power to the power storage device and a power sale priority operation that prioritizes the power sale operation over the charge operation are selected for each operation target period. A power control apparatus that performs power operation for each operation target period, and is a period before the operation target period and is longer than the operation target period before the operation target period. A calculator for calculating an average power purchase unit price that is an average unit price of the purchased power in the calculation target period according to an amount and an electricity charge of the purchased power in the calculation target period, and for each operation target period, Said A selector that selects one of the power sale priority operation and the charge priority operation according to the relationship between the average power purchase unit price calculated by a power supply unit and a power sale unit price that is a unit price of the power sale power; And a controller that performs the one selected by the selector from the power sale priority operation and the charge priority operation for each target period.

  Further, the power control method according to one aspect of the present invention provides the power storage device with the surplus power, rather than the power selling operation of outputting the surplus power excluding the demand power from the generated power of the distributed power source to the power system as the sold power. A power control method in which one of a charge priority operation for giving priority to a charge operation for charging and a power sale priority operation for giving priority to the power sale operation over the charge operation is selected for each operation target period. In each operation target period, the amount of purchased power in the calculation target period that is a period before the operation target period and longer than the operation target period before the operation target period, and the calculation A calculation step of calculating an average power purchase unit price that is an average unit price of the power purchase power in the calculation target period according to the electricity charge of the power purchase power in the target period, and the calculation step for each operation target period A selection step of selecting one of the power sale priority operation and the charge priority operation according to the relationship between the calculated average power purchase price and the power sale unit price that is the unit price of the power sale power, and for each operation target period And a control step of performing the one selected in the selection step from the power sale priority operation and the charge priority operation.

  The power control device according to one embodiment of the present invention can appropriately support the effective use of surplus power.

FIG. 1 is a graph showing the unit price of power purchase in an assumed example for each time. FIG. 2 is a graph showing the average power purchase price when the power sale priority operation in the assumed example is performed. FIG. 3 is a flowchart showing power control processing in an assumed example. FIG. 4 is a graph showing an average power purchase unit price when the charge priority operation in the assumed example is performed. FIG. 5 is a block diagram illustrating a power control system according to the embodiment. FIG. 6 is a block diagram illustrating the power control apparatus according to the embodiment. FIG. 7 is a flowchart illustrating power control processing in the embodiment. FIG. 8 is a flowchart showing the average power unit price calculation process in the embodiment. FIG. 9 is a relationship diagram illustrating a relationship between the operation target period and the calculation target period in the embodiment. FIG. 10 is a graph showing the average power purchase price in the embodiment.

(Knowledge that became the basis of the present invention)
The present inventor has found a new problem regarding the effective use of surplus power. This will be specifically described below.

  Conventionally, there is a power control device that controls power in a system including a distributed power source and a power storage device. For example, the distributed power supply and the power storage device are installed in a customer facility. The distributed power source may be a solar power generation device that generates power with sunlight. The power generated by the distributed power supply is consumed by load equipment in the facility.

  When the generated power of the distributed power source exceeds the demand power of the load device, the power control apparatus performs a power selling operation of outputting surplus power as power sold power to a power system operated by a power company or the like. As a result, power flows to the power system. The flow of power to the power system is also called reverse power flow.

  Alternatively, when the generated power of the distributed power source exceeds the demand power, the power control device performs a charging operation for charging the power storage device with surplus power. The power charged in the power storage device is then discharged from the power storage device and consumed in the load device during a period when the demand power of the load device exceeds the generated power of the distributed power source.

  Here, the surplus power is surplus power of the generated power relative to the demand power, and specifically, is the power excluding the demand power from the generated power of the distributed power source. Surplus power corresponds to a portion of the generated power of the distributed power source that exceeds the demand power.

  The power control apparatus may switch between a power sale priority operation that prioritizes the power sale operation and a charge priority operation that prioritizes the charge operation according to the relationship between the power purchase unit price and the power sale unit price. The power purchase unit price is the unit price of the electricity charge of purchased power, which is the power flowing from the power system to the customer's facility. The power selling unit price is a unit price of the electricity rate of the sold power, which is the power flowing from the customer's facility to the power system.

  For example, the electricity charge for purchased power is a charge paid by a consumer to an electric power company or the like, and the electricity charge for sold power is a charge received by the consumer from the electric power company or the like. If the power sale unit price is lower than the power purchase unit price, the power control device charges the power storage device with surplus power, and uses the surplus power charged in the power storage device during a period when the demand power exceeds the generated power. On the other hand, if the power selling unit price is not lower than the power purchasing unit price, the power control device outputs surplus power as sold power to the power system.

  That is, the power control apparatus may perform a charge priority operation that prioritizes the charge operation if the power sale unit price is lower than the power purchase unit price. Then, the power control apparatus may perform a power sale priority operation that prioritizes the power sale operation if the power sale unit price is not lower than the power purchase unit price.

  This not only allows consumers to properly receive consideration and reduces payments appropriately, but also allows the power control device to properly use surplus power in the power grid and surplus power in the customer's facility. Can be switched. Therefore, the power control apparatus can appropriately support effective use of surplus power.

  However, it is not always easy to appropriately switch between the power sale priority operation and the charge priority operation according to the relationship between the power purchase unit price and the power sale unit price. For example, the unit price of power purchase may fluctuate in multiple stages according to the amount of power purchased (amount of power purchased). Therefore, it is not easy to appropriately switch between the power sale priority operation and the charge priority operation according to the relationship between the power purchase unit price that fluctuates according to the power purchase amount and the power sale unit price.

  Furthermore, the amount of power purchased varies between the power sale priority operation and the charge priority operation. In these two cases, it is not easy to appropriately predict the amount of purchased power and appropriately predict the unit price of power purchase that varies according to the amount of purchased power.

  FIG. 1 is a graph showing the power purchase unit price for each time in an assumed example which is an example assumed by the present inventor. For example, the unit price of electricity purchase is fixed at 12.59 yen / kWh at 0-9 o'clock and 21-24 o'clock. On the other hand, from 9 to 21:00, the power purchase unit price fluctuates in multiple stages according to the power purchase amount.

  Specifically, 43.71 yen / kWh is applied as a power purchase unit price for a portion exceeding 170 kWh in the amount of power purchased from 9 to 21:00 in one month. 37.84 yen / kWh is applied as the unit price for power purchase from 9 to 21:00 in one month for a portion exceeding 70 kWh and up to 170 kWh. 28.38 yen / kWh is applied as the unit price of power purchase for a portion up to 70 kWh out of the amount of power purchased from 9 to 21:00 in one month.

  FIG. 2 is a graph showing the average power purchase price when the power sale priority operation in the assumed example is performed. In the example of FIG. 2, the amount of power purchased during the period when multi-stage power purchase unit prices are applied in one month, that is, the amount of power purchased from 9 to 21:00 in one month is 200 kWh.

  Then, 28.38 yen / kWh is applied as the unit price of power purchase for a portion up to 70 kWh (70 kWh) out of 200 kWh. In addition, 37.84 yen / kWh is applied as the unit price of power purchase for a portion (100 kWh) exceeding 200 kWh and exceeding 70 kWh. Moreover, 43.71 yen / kWh is applied as a unit price for power purchase for a portion exceeding 30 kWh (30 kWh) in 200 kWh.

  Therefore, the electricity bill with respect to the amount of electricity purchased during the time when multi-stage electricity purchase unit prices are applied in one month is calculated as 7081 yen (70 × 28.38 + 100 × 37.84 + 30 × 43.71). And the average power purchase unit price with respect to this power purchase amount is calculated as 35.4 yen / kWh (7081/200).

  The power control apparatus may select one of the power sale priority operation and the charge priority operation as an operation for the next month according to the relationship between the calculated average power purchase unit price and power sale unit price. In this assumed example, the unit price of power sales is 34.0 yen / kWh. Therefore, since the power selling unit price (34.0 yen / kWh) is lower than the average power purchase unit price (35.4 yen / kWh), the power control apparatus may select the charging priority operation as the operation for the next month. .

  Next, a power control process for selecting one of the power sale priority operation and the charge priority operation according to the relationship between the average power purchase unit price and the power sale unit price will be described with reference to FIG.

  FIG. 3 is a flowchart showing power control processing in an assumed example. First, the power control apparatus calculates an average power purchase unit price according to the amount of purchased power and the electricity charge in the previous operation target period (S101). The previous operation target period is, for example, the previous month. More specifically, the previous operation target period may be the previous charge target period. That is, each operation target period may be a unit period for billing.

  Next, the power control apparatus selects one of the power sale priority operation and the charge priority operation according to the relationship between the average power purchase unit price and the power sale unit price (S102). For example, if the power sale unit price is lower than the average power purchase unit price, the power control device selects the charge priority operation. If the power sale unit price is not lower than the average power purchase unit price, the power control unit selects the power sale priority operation. To do.

  Next, the power control apparatus executes one operation selected from the power sale priority operation and the charge priority operation (S103). Then, until the operation target period elapses (No in S104), the power control apparatus executes the selected operation (S103). If the operation target period elapses (Yes in S104), the power control apparatus again determines the average power purchase unit price according to the amount of electric power purchased and the electricity charge in the previous operation target period (elapsed operation target period). Is calculated (S101). Then, the power control apparatus repeats the subsequent processes.

  For example, as shown in FIG. 2, when the power sale priority operation is performed and the power purchase amount is 200 kWh, the average power purchase price is calculated as 35.4 yen / kWh. When the power sale unit price is 34.0 yen kwH, the power sale unit price is lower than the average power purchase unit price. Therefore, in this case, it is assumed that the charge priority operation is more appropriate than the power sale priority operation. Therefore, according to the flowchart of FIG. 3, the power control apparatus selects the charge priority operation as the next month operation from the power sale priority operation and the charge priority operation, and performs the charge priority operation in the next month.

  In this case, surplus power is charged in the power storage device during a period in which the generated power is greater than the demand power, and then the power is discharged from the power storage device in a period in which the demand power is greater than the generated power. Therefore, the amount of electricity purchased decreases due to self-consumption of the generated power.

  FIG. 4 is a graph showing an average power purchase unit price when the charge priority operation in the assumed example is performed. In the example of FIG. 4, the amount of power purchased during the period when multi-stage power purchase unit prices are applied in one month, that is, the amount of power purchased from 9 to 21:00 in one month is 140 kWh.

  That is, in the example of FIG. 4, since the charge priority operation is performed, the amount of power purchased is smaller than that of the example of FIG. Specifically, even if there is no change between the example of FIG. 4 and the example of FIG. 2 regarding the amount of power used and the amount of power generated at the customer's facility, the charge priority operation is performed in the example of FIG. Compared to the second example, the power purchase amount is reduced to 140 kWh.

  And 28.38 yen / kWh is applied as a unit price for power purchase for a portion up to 70 kWh (70 kWh) out of 140 kWh. Moreover, 37.84 yen / kWh is applied as a unit price for electric power for a portion (70 kWh) exceeding 140 kWh and up to 170 kWh in 140 kWh.

  Therefore, the electricity bill with respect to the amount of electricity purchased during the period when the multi-stage electricity purchase unit price is applied in one month is calculated as 4635 yen (70 × 28.38 + 70 × 37.84). Then, the average power purchase unit price for this power purchase amount is calculated as 33.1 yen / kWh (4635 ÷ 140). That is, in the example of FIG. 4, the power purchase unit price is reduced to 33.1 yen / kWh compared to the example of FIG.

  When the power sale unit price is 34.0 yen / kWh, the power sale unit price (34.0 yen / kWh) is higher than the average power purchase price (33.1 yen / kWh). Therefore, the magnitude relationship between the average power purchase unit price and the power sale unit price is reversed between the example of FIG. 2 and the example of FIG. And since a power sale unit price is higher than an average power purchase unit price, a power control apparatus selects a power sale priority operation | movement as operation | movement of the following month. Thereby, the operation of the next month returns to the power sale priority operation. Thereafter, hunting occurs in which the power sale priority operation and the charge priority operation are repeatedly switched every month.

  That is, even if the amount of power used and the amount of power generated at the customer's facility is constant, the power sale priority operation and the charge priority operation are repeatedly switched every month. However, if the power consumption and generated power at the customer's facility are constant, basically one of the power sale priority operation and the charge priority operation is more appropriate than the other, and the relationship does not change. It is assumed. Therefore, by repeatedly switching the power sale priority operation and the charge priority operation every month, a phenomenon occurs in which an inappropriate operation is performed at a rate of one month out of two months.

  In practice, the amount of power used and the amount of power generated at the customer's facility may change. Therefore, there is a possibility that a phenomenon in which the power sale priority operation and the charge priority operation are repeatedly switched every month is appropriate. Therefore, it is not easy to detect and suppress the occurrence of hunting. In addition, it is not easy to accurately predict the amount of power used and the amount of power generated at the customer's facility, and to select an appropriate operation from the power sale priority operation and the charge priority operation by simulation.

  Therefore, an appropriate operation is not selected from the power sale priority operation and the charge priority operation, and the effective use of surplus power may be hindered.

  Therefore, a power control apparatus according to an aspect of the present invention includes a calculator, a selector, and a controller, and selects one of a charge priority operation and a power sale priority operation for each operation target period. Here, the charge priority operation is an operation that prioritizes the charge operation over the power selling operation. The power sale priority operation is an operation that prioritizes the power sale operation over the charge operation. The power selling operation is an operation in which surplus power excluding demand power among the generated power of the distributed power source is output to the power system as sold power. The charging operation is an operation for charging the power storage device with surplus power.

  For each operation target period, the calculator calculates the amount of electric power purchased in the calculation target period that is a period before the operation target period and is longer than the operation target period before the operation target period, and the calculation target The average power purchase unit price is calculated according to the electricity charge of the purchased power during the period. Here, the average power purchase unit price is the average unit price of purchased power in the calculation target period.

  The selector selects one of the power sale priority operation and the charge priority operation according to the relationship between the average power purchase unit price calculated by the calculator and the power sale unit price that is the unit price of the power sale power for each operation target period. . The controller performs one selected by the selector from the power sale priority operation and the charge priority operation for each operation target period.

  As a result, the power control apparatus may select an appropriate operation as the operation in the operation target period from the power sale priority operation and the charge priority operation based on the purchased power in the calculation target period longer than the previous operation target period. it can. Since the calculation target period is longer than the previous operation target period, hunting is suppressed. Therefore, the power control apparatus can appropriately support effective use of surplus power.

  For example, the calculation target period before the operation target period may include two or more operation target periods before the operation target period. For example, the calculation target period before the operation target period may be equal to two or more operation target periods before the operation target period. For example, the calculation target period before the operation target period may be equal to an even number of operation target periods before the operation target period.

  Further, for example, the unit price of power sale may be an average unit price of power sold during the calculation target period. The calculator may calculate the power selling unit price for each predetermined operation target period based on the amount of power sold in the calculation target period and the electricity price of the power sold in the calculation target period.

  For example, the selector may select the charge priority operation when the power selling unit price is lower than the average power purchasing unit price. The selector may select the power sale priority operation when the power sale unit price is not lower than the average power purchase unit price.

  Further, for example, the controller may perform one of the power sale priority operation and the charge priority operation selected by the selector by controlling the amount of power charged in the power storage device.

  In addition, for example, an electricity bill and a unit price indicate an electric energy cost, and can be expressed as a power cost and a unit cost, respectively. That is, the power control device can appropriately support the effective use of surplus power by appropriately evaluating the electric energy cost.

  In addition, for example, the power selling unit price is based on the supply and demand balance of the sold power. The power purchase unit price is based on the supply-demand balance of purchased power.

  Therefore, for example, the fact that the unit price of power sales is lower than the unit price of power purchase means that the demand for power sold in the power system is relatively small, and the surplus power is used individually rather than being used in the whole power system. Means that is appropriate. Conversely, the fact that the unit price of power sales is higher than the unit price of power purchase means that the demand for power sales in the power system is relatively large, and it is better to use the entire power system than to use surplus power individually. Means appropriate.

  That is, the relationship between the power selling unit price and the power purchasing unit price indicates the power status in the power system. The power control device appropriately supports the effective use of surplus power by selecting an appropriate operation from the power sale priority operation and the charge priority operation according to the relationship between the power sale unit price and the power purchase unit price, and stabilizes the power system. It can contribute to operation and stable power supply.

  Furthermore, these comprehensive or specific aspects may be realized by a non-transitory recording medium such as a system, an apparatus, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM. It may be realized by various combinations.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, order of operations, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as arbitrary constituent elements.

  Moreover, in the following description, electric power may mean the amount of electric power or the value of electric power.

(Embodiment)
FIG. 5 is a block diagram showing a power control system including the power control apparatus according to the present embodiment. FIG. 5 shows a solar battery 102, a power regulator 103, a power control device 105, a power sensor 106, a power sensor 107, a distribution board 108, a load device 109, a power regulator 111, a storage battery 112, a power sensor 113, and a power system. 114 is shown.

  In the present embodiment, the solar cell 102, the power regulator 103, the power control device 105, the power sensor 106, the power sensor 107, the distribution board 108, the load device 109, the power regulator 111 and the storage battery 112 are installed in the facility 104. Has been. The solar cell 102 and the power regulator 103 constitute a distributed power source 101. Power regulator 111 and storage battery 112 constitute power storage device 110.

  The power control system 100 includes, for example, a distributed power source 101, a power control device 105, and a power storage device 110 among the plurality of components illustrated in FIG. Note that the power control system 100 may include any one or more components among the plurality of components illustrated in FIG. The other components may be included in another system.

  The distributed power source 101 includes a solar cell 102 and a power regulator 103, and is a power generation system or power generation device that generates power and outputs the generated power. In the present embodiment, the distributed power source 101 is a solar power generation device. However, the distributed power source 101 is not limited to a solar power generation device, and may be a wind power generation device or the like.

  The solar cell 102 is a device that generates electric power from sunlight. Specifically, the solar cell 102 uses the photovoltaic effect to convert light energy into electric power. The solar cell 102 may constitute a solar panel.

  The power regulator 103 is a device also called a PCS (Power Conditioning Subsystem), and is a device that adjusts and outputs the generated power of the solar cell 102. Specifically, the power regulator 103 converts the generated power obtained as DC power into AC power having a predetermined voltage, and outputs the generated power as AC power having a predetermined voltage. That is, the power regulator 103 may include a bidirectional inverter.

  The facility 104 is a customer facility. The facility 104 may be a house, an office, a factory, or a room.

  The power control apparatus 105 is an apparatus that selects and performs one of the charge priority operation and the power sale priority operation for each operation target period. For example, the power control apparatus 105 is a computer that performs information processing. The power control device 105 may be composed of a plurality of devices.

  Here, the charge priority operation is an operation that prioritizes the charge operation over the power selling operation. For example, in the charge priority operation, the charging operation is performed when both the charging operation and the power selling operation are possible. The power sale priority operation is an operation that prioritizes the power sale operation over the charge operation. For example, in the power selling priority operation, the power selling operation is performed when both the power selling operation and the charging operation are possible.

  The power selling operation is an operation of outputting surplus power to the power system 114 as sold power. The charging operation is an operation for charging the power storage device 110 with surplus power. The surplus power is power obtained by removing demand power from the power generated by the distributed power source 101.

  For example, the power control apparatus 105 acquires the amount of power generated by the distributed power supply 101 via the power sensor 106. In addition, the power control apparatus 105 acquires the amount of power demand of the load device 109 via the power sensor 107. The power demand of the load device 109 corresponds to the power consumption of the load device 109. And the electric power control apparatus 105 acquires the quantity of the surplus electric power remove | excluding the demand electric power from the generated electric power. The amount of generated power, the amount of demand power, and the amount of surplus power may each be predicted amounts.

  For example, the power control device 105 performs the charging operation by controlling the power regulator 111 of the power storage device 110 so that the surplus power is charged in the power storage device 110 (storage battery 112) according to the amount of surplus power. In addition, the power control device 105 sets the power regulator 111 of the power storage device 110 so that surplus power is not charged in the power storage device 110 (storage battery 112) when the generated power of the distributed power source 101 exceeds the demand power of the load device 109. By controlling, power selling operation is performed.

  The power control device 105 acquires a power purchase amount, which is the amount of power flowing from the power system 114 to the distribution board 108 via the power sensor 113, and determines whether the charge priority operation or the power sale priority operation is based on the power purchase amount or the like. May be selected. A specific configuration and operation of the power control apparatus 105 will be described later with reference to FIGS.

  Note that the charging operation may be limited by the state of charge (SOC) of power storage device 110 (storage battery 112). For example, the charging operation is prohibited in the fully charged state. In addition, the power selling operation may be limited depending on the state of the power system 114. When the power supplied to the power system 114 is larger than the power demand for the power system 114, the reverse power flow may be restricted and the power selling operation may be prohibited.

  The power sensor 106 measures the power flowing from the distributed power source 101 to the distribution board 108. For example, the power sensor 106 is a sensor that detects power. The power sensor 106 can measure the generated power (output value of the generated power) of the distributed power supply 101 by measuring the power flowing from the distributed power supply 101 to the distribution board 108.

  The power sensor 107 measures the power flowing from the distribution board 108 to the load device 109. For example, the power sensor 107 is a sensor that detects power. The power sensor 107 can measure the power demand (power consumption) of the load device 109 by measuring the power flowing from the distribution board 108 to the load device 109.

  The distribution board 108 is an electric circuit for branching the power line. Distribution board 108 is electrically connected to distributed power supply 101, load device 109, power storage device 110, and power system 114. Electric power is appropriately supplied from the distributed power source 101, the power storage device 110, and the power system 114 to the distribution board 108. In addition, power is appropriately supplied from the distribution board 108 to the load device 109, the power storage device 110, and the power system 114.

  The load device 109 is an electrical device, for example, a home appliance that consumes power. The load device 109 may be a lighting device, a television receiver, or an air conditioner. Here, one load device 109 is shown, but a plurality of load devices 109 may exist.

  The power storage device 110 includes a power regulator 111 and a storage battery 112, and is a device that charges the storage battery 112 with power and discharges the power from the storage battery 112.

  The power adjuster 111 is a device called PCS, and is a device that adjusts the power charged in the storage battery 112 and the power discharged from the storage battery 112.

  Specifically, the power regulator 111 converts the AC power supplied from the distribution board 108 into DC power having a predetermined voltage, and outputs the DC power having a predetermined voltage to the storage battery 112, thereby Charge the power. Moreover, the power regulator 111 converts the discharge power obtained as DC power from the storage battery 112 into AC power having a predetermined voltage, and supplies the discharge power to the distribution board 108 as AC power having a predetermined voltage. That is, the power regulator 111 may include a bidirectional inverter.

  Further, the power adjuster 111 adjusts the amount of charging power (charging amount) and the amount of discharging power (discharging amount) according to the control performed by the power control apparatus 105. Further, the power regulator 111 may acquire the amount of power (tidal flow) flowing between the distribution board 108 and the power system 114 via the power sensor 113. The power adjuster 111 may adjust the charge amount and the discharge amount according to the control performed by the power control device 105 and the tidal flow obtained from the power sensor 113.

  For example, when the power control device 105 selects the charge priority operation, the power regulator 111 may charge the storage battery 112 with power so that a reverse power flow does not occur. Further, when the power control device 105 selects the power sale priority operation, the power regulator 111 may generate a reverse power flow without charging the storage battery 112 with power. Further, the power regulator 111 may discharge power from the storage battery 112 within a range where no reverse power flow occurs.

  The storage battery 112 is a battery capable of charging and discharging electric power, and is also called a secondary battery or a rechargeable battery. The power regulator 111 charges the storage battery 112 with power and discharges the power from the storage battery 112.

  The power sensor 113 measures the power flowing between the distribution board 108 and the power system 114. For example, the power sensor 113 is a sensor that detects power. The power sensor 113 can measure the power selling power by measuring the power flowing from the distribution board 108 to the power system 114. The power sensor 113 can measure the purchased power by measuring the power flowing from the power system 114 to the distribution board 108.

  The power system 114 is, for example, a power system operated by an electric power company. The power system 114 supplies power to the customer's facility 104. Specifically, power system 114 supplies power to load device 109 and power storage device 110 in customer facility 104.

  6 is a block diagram showing the power control apparatus 105 shown in FIG. The power control apparatus 105 includes a calculator 151, a selector 152, and a controller 153.

  The calculator 151 is a processing unit that calculates an average power purchase price. The calculator 151 may be a processor or an integrated circuit. The average power purchase unit price is the average unit price of purchased power in the calculation target period. The calculation target period is a period determined for each operation target period. Specifically, the calculation target period is a period before the operation target period and is longer than the previous operation target period. The calculation target period may be a period until immediately before the operation target period, or may be a period until the start of the operation target period.

  For example, the calculator 151 calculates the average power purchase unit price for each operation target period according to the amount of purchased power in the calculation target period and the electricity charge of the purchased power in the calculation target period. That is, the calculator 151 updates the average power purchase unit price for selecting an operation in the operation target period at the start of each operation target period. The operation target period corresponds to a time interval for updating the average power purchase unit price.

  Note that the above-mentioned electricity rate is an electricity rate that varies according to the amount of purchased power, and the above electricity rate does not include a fixed basic rate. Moreover, the above-mentioned purchased power is specifically purchased power to which a stepped unit price is applied.

  The selector 152 is a processing unit that selects one of the power sale priority operation and the charge priority operation. The selector 152 may be a processor or an integrated circuit. For example, the selector 152 determines from the power sale priority operation and the charge priority operation according to the relationship between the average power purchase unit price calculated by the calculator 151 and the power sale unit price that is the unit price of the power sale power for each operation target period. Select one.

  The controller 153 is a processing unit that selectively performs a power sale priority operation and a charge priority operation. The controller 153 may be a processor or an integrated circuit. For example, the controller 153 performs one selected by the selector 152 from the power sale priority operation and the charge priority operation for each operation target period.

  The controller 153 may perform the power sale priority operation or the charge priority operation by controlling the charging of the power storage device 110. Specifically, the controller 153 performs the power sale priority operation by causing the power storage device 110 not to charge surplus power. Controller 153 performs a charge priority operation by charging power storage device 110 with surplus power. The controller 153 may transmit a command value for controlling the operation of the power storage device 110 to the power regulator 111 of the power storage device 110 in order to perform the power sale priority operation or the charge priority operation.

  FIG. 7 is a flowchart showing power control processing performed by the power control apparatus 105 shown in FIG.

  First, the calculator 151 of the power control device 105 calculates the average power purchase unit price according to the amount of purchased power and the electricity bill in the calculation target period (S201). The calculation target period is a period before the operation target period and is longer than the previous operation target period. For example, each operation target period may be determined as one month, and the calculation target period may be determined as two months before the operation target period.

  Next, the selector 152 of the power control apparatus 105 selects one of the power sale priority operation and the charge priority operation according to the relationship between the average power purchase unit price and the power sale unit price (S202). For example, if the power sale unit price is lower than the average power purchase unit price, the selector 152 selects the charge priority operation. If the power sale unit price is not lower than the average power purchase unit price, the selector 152 selects the power sale priority operation. To do.

  Next, the controller 153 of the power control apparatus 105 executes one operation selected by the selector 152 from the power sale priority operation and the charge priority operation (S203). Until the operation target period elapses (No in S204), the controller 153 of the power control apparatus 105 executes the selected operation (S203).

  If the operation target period has elapsed (Yes in S204), the calculator 151 of the power control apparatus 105 determines the amount of electric power purchased and the electricity charge in the calculation target period for determining the operation of the next operation target period. Then, the average power purchase unit price is calculated (S201). Then, the power control apparatus 105 repeats the subsequent processing.

  In the power control process shown in FIG. 7, the average power purchase unit price in the calculation target period longer than the previous operation target period is used. Therefore, even when hunting occurs that switches between the power sale priority operation and the charge priority operation for each operation target period, the operation in the next operation target period is appropriately performed according to the average power purchase price reflecting both. It is determined. Therefore, hunting is suppressed.

  Each of the operation target period and the calculation target period may be configured with a predetermined time zone on a plurality of days. Specifically, the predetermined time zone is a time zone (for example, 9 to 21:00) in which a stepped unit price is applied. That is, the time zone (for example, 0-9 o'clock and 21-24 o'clock) where the stepped unit price is not applied may be excluded from each of the operation target period and the calculation target period. Specifically, for example, the power control apparatus 105 determines an operation in a future predetermined time zone according to the average power purchase unit price in the past predetermined time zone.

  FIG. 8 is a flowchart showing the average power purchase price calculation process (S201 in FIG. 7) used in the power control apparatus 105 shown in FIG.

  First, the calculator 151 of the power control apparatus 105 acquires power purchase unit price information indicating a stepped unit price of purchased power (S301). For example, the power purchase unit price information is a portion of the power purchase amount of 28.38 yen / kWh for a portion up to 70 kWh, 37.84 yen / kWh for a portion exceeding 70 kWh and up to 170 kWh, and a portion exceeding 170 kWh Is 43.71 yen / kWh. Moreover, the power purchase unit price information may indicate a time zone in which a stepped unit price is applied.

  The power purchase unit price information may be stored in advance in a storage device (not shown) of the power control apparatus 105. Then, the calculator 151 may acquire power purchase unit price information from the storage device. Alternatively, the power purchase unit price information may be input by a user (customer) via an input device (not shown) of the power control apparatus 105. And the power purchase unit price information may acquire the power purchase unit price information input by the user.

  Alternatively, the calculator 151 may acquire power purchase unit price information from a device external to the power control device 105 via a communication device (not shown) of the power control device 105.

  Next, the calculator 151 acquires power purchase amount information indicating the amount of power purchased (power purchase amount) in the calculation target period (S302). For example, the calculator 151 acquires information indicating the power purchase amount measured by the power sensor 113 during the calculation target period from the power sensor 113 as power purchase amount information. The calculator 151 may acquire the power purchase amount in the calculation target period according to the time zone indicated by the power purchase unit price information as the time zone in which the stepped unit price is applied.

  Next, the calculator 151 is a unit price indicated by the power purchase unit price information, and is calculated according to the stepped unit price of the purchased power and the power purchase amount indicated by the power purchase amount information, and the power purchase amount in the calculation target period. An electricity charge for purchased power in the target period is calculated (S303).

  For example, when the amount of electricity purchased in the calculation target period is 170 kWh, the portion up to 70 kWh is 70 kWh, and the portion exceeding 70 kWh to 170 kWh is 100 kWh, and the portion exceeding 170 kWh is 0 kWh. . Therefore, in this case, the calculator 151 calculates the electricity charge of purchased power during the calculation target period as 5770 yen (70 kWh × 28.38 yen / kWh + 100 kWh × 37.84 yen / kWh + 0 kWh × 43.71 yen / kWh). .

  Next, the calculator 151 calculates an average power purchase unit price during the calculation target period by dividing the electricity charge of the purchased power during the calculation target period by the amount of power purchased during the calculation target period (S304). For example, when the electricity charge of purchased power in the calculation target period is 5770 yen and the power purchase amount in the calculation target period is 170 kWh, the average power purchase price in the calculation target period is 33.9 yen / kWh (5770 yen / 170 kWh).

  The calculator 151 can calculate the average power purchase unit price during the calculation target period by the above calculation process. Note that the above calculation process is an example, and other methods may be applied to the calculation process. For example, the calculator 151 may acquire the electricity charge of purchased power during the calculation target period from another device and apply the obtained electricity charge to the average power purchase price calculation process.

  FIG. 9 is a relationship diagram illustrating the relationship between the operation target period and the calculation target period used in the power control apparatus 105 illustrated in FIG. 5.

  In the example of FIG. 9, each of the operation target periods 211 to 216 is half a month. Each of the calculation target periods 223 to 226 is one month. Each of the billing target periods 231 to 233 is one month. That is, the length of one of the operation target periods 211 to 216 corresponds to half of the length of one of the charge target periods 231 to 233. The length of one of the calculation target periods 223 to 226 corresponds to the length of one of the charge target periods 231 to 233.

  For example, at the start of the first operation target period 211, the power control apparatus 105 selects one of the power sale priority operation and the charge priority operation. At this time, since there is no past record, the power control apparatus 105 may select one of the initially set power sale priority operation and the charge priority operation. Then, the power control apparatus 105 performs one selected from the power sale priority operation and the charge priority operation in the operation target period 211.

  In addition, at the start of the next operation target period 212, the power control device 105 selects one of the power sale priority operation and the charge priority operation. At that time, since past performance is insufficient, the power control apparatus 105 may select one of the initially set power sale priority operation and the charge priority operation. Alternatively, the power control apparatus 105 calculates the average power purchase unit price in the past operation target period 211, and according to the relationship between the power sale unit price and the average power purchase unit price in the operation target period 211, the power sale priority operation and the charge priority operation. One of them may be selected.

  Then, the power control apparatus 105 performs one selected from the power sale priority operation and the charge priority operation in the operation target period 212.

  In addition, at the start of the next operation target period 213, the power control apparatus 105 calculates the average power purchase unit price in the calculation target period 223 as the average power purchase unit price for determining the operation in the operation target period 213. Then, the power control device 105 selects one of the power sale priority operation and the charge priority operation as an operation to be performed in the operation target period 213 according to the relationship between the power sale unit price and the average power purchase price in the calculation target period 223. Then, the power control apparatus 105 performs one selected from the power sale priority operation and the charge priority operation in the operation target period 213.

  Similarly, at the start of the next operation target period 214, the power control apparatus 105 calculates the average power purchase price in the calculation target period 224 as the average power purchase price for determining the operation in the operation target period 214. Then, the power control apparatus 105 selects one of the power sale priority operation and the charge priority operation as an operation to be performed in the operation target period 214 according to the relationship between the power sale unit price and the average power purchase price in the calculation target period 224. Then, the power control apparatus 105 performs one selected from the power sale priority operation and the charge priority operation in the operation target period 214.

  Thereafter, similarly, the power control apparatus 105 calculates an average power purchase unit price in the calculation target period 225 for the operation target period 215, and selects an operation in the operation target period 215 from the power sale priority operation and the charge priority operation. The selected operation is performed in the operation target period 215. Further, the power control apparatus 105 calculates an average power purchase unit price in the calculation target period 226 with respect to the operation target period 216, selects an operation in the operation target period 216 from the power sale priority operation and the charge priority operation, and is selected. The operation is performed in the operation target period 216.

  Here, the power control apparatus 105 calculates the average power purchase price in the calculation target period 225 including the operation target period 213 and the operation target period 214 as the average power purchase price for selecting the operation in the operation target period 215.

  Thus, even if hunting occurs in the operation target period 213 and the operation target period 214, the power control apparatus 105 reflects both the result of the power sale priority operation and the result of the charge priority operation. The average power purchase unit price can be calculated. Therefore, in this case, the power control apparatus 105 determines one of the power sale priority operation and the charge priority operation from the power sale priority operation and the charge priority operation according to the average power purchase price reflecting both the result of the power sale priority operation and the result of the charge priority operation. 215 operations can be selected.

  Therefore, the power control apparatus 105 can appropriately select one of the power sale priority operation and the charge priority operation and suppress continuation of hunting.

  FIG. 10 is a graph showing the average power purchase price used in the power control apparatus 105 shown in FIG. In this example, the amount of power purchased during the period when multi-stage power purchase unit prices are applied in one month, that is, the amount of power purchased from 9 to 21:00 in one month is 170 kWh.

  Further, this example shows a result of the charge priority operation being performed in the first or last half month of the calculation target period of one month and the power sale priority operation being performed in the other half month. That is, the charge priority operation and the power sale priority operation are performed in the calculation target period (one month), the length of the period during which the charge priority operation is performed (half a month), and the period during which the power sale priority operation is performed. The length (half month) is the same. As a result, the amount of electric power purchased for one month reaches 170 kWh, which is intermediate between 200 kWh in FIG. 2 and 140 kWh in FIG. 4.

  Then, 28.38 yen / kWh is applied as the unit price of power purchase for a portion up to 70 kWh (70 kWh) out of 170 kWh. Moreover, 37.84 yen / kWh is applied as a unit price for electric power for a portion (100 kWh) exceeding 170 kWh to 170 kWh in 170 kWh.

  Therefore, the electricity charge for the amount of electricity purchased during the period when multi-stage electricity purchase unit prices are applied in one month is calculated as 5770 yen (70 × 28.38 + 100 × 37.84). Then, the average power purchase unit price for this power purchase amount is calculated as 33.9 yen / kWh (5770 ÷ 170). When the power sale unit price is 34.0 yen / kWh, the power sale unit price (34.0 yen / kWh) is higher than the average power purchase price (33.9 yen / kWh). Therefore, the power control apparatus 105 selects the power sale priority operation as the operation for the next operation target period.

  That is, the power control apparatus 105 can appropriately select one of the power sale priority operation and the charge priority operation according to the average power purchase price reflecting both the result of the power sale priority operation and the result of the charge priority operation. it can.

  As described above, power control apparatus 105 in the present embodiment calculates an average power purchase unit price in a calculation target period longer than the operation target period. Then, the power control device 105 selects one of the power sale priority operation and the charge priority operation according to the relationship between the power sale unit price and the average power purchase unit price. Then, the power control apparatus 105 performs one selected from the power sale priority operation and the charge priority operation in the operation target period.

  Thereby, the power control apparatus 105 can appropriately select the operation in the operation target period from the power sale priority operation and the charge priority operation according to the average power purchase unit price in the calculation target period longer than the operation target period. Therefore, the power control apparatus 105 can suppress hunting and can appropriately support effective use of surplus power.

  In the example of FIGS. 9 and 10, one charging target period is divided into a plurality of operation target periods. However, one accounting period may be equal to one operation period. And one accounting object period may contain a plurality of accounting object periods.

  Further, if the calculation target period is longer than the operation target period, a period during which the power sale priority operation is performed and a period during which the charge priority operation is performed can be partially included.

  That is, if the calculation target period is longer than the operation target period, both the result of the power sale priority operation and the result of the charge priority operation are reflected in the average power purchase price in the calculation target period. More specifically, if the calculation target period for selecting the operation in the operation target period is longer than the operation target period before the operation target period, the result of the power sale priority operation and the result of the charge priority operation Both are reflected in the average power purchase price during the calculation period.

  Therefore, the calculation target period is not limited to twice the operation target period as long as it is longer than the operation target period.

  However, if the calculation target period is twice or more as long as the operation target period, it is possible to sufficiently include the period during which the power sale priority operation is performed and the period during which the charge priority operation is performed. Therefore, it is recommended that the calculation target period be at least twice the operation target period. That is, it is recommended that the calculation target period for determining the operation in the operation target period includes two or more continuous operation target periods before the operation target period.

  In order to simplify the calculation process, the calculation target period may be an integral multiple of the operation target period. That is, the calculation target period for determining the operation in the operation target period may be equal to the total period of a plurality of continuous operation target periods before the operation target period. Thereby, the power control apparatus 105 can specify smoothly the stepwise power purchase unit price applied to the power purchase amount, and can suppress an increase in the calculation amount.

  Further, the calculation target period may be an even multiple of the operation target period. That is, the calculation target period for determining the operation in the operation target period may be equal to the total period of the even number of continuous operation target periods before the operation target period.

  Thereby, the power control apparatus 105 can include the period in which the power sale priority operation is performed and the period in which the charge priority operation is performed to the same extent in the calculation target period when hunting occurs. Therefore, the power control apparatus 105 can appropriately select one of the power sale priority operation and the charge priority operation for the next operation target period.

  The lengths of the calculation target period and the operation target period are not necessarily specified in units of days. Each length of the calculation target period and the operation target period may be defined in units of months or may be defined in units of years. The lengths of the calculation target period and the operation target period are basically constant, but may vary.

  The unit price of power sale may be the average unit price of power sold during the calculation target period. For example, the power selling unit price may fluctuate according to the amount of power sold (amount of power sold), similarly to the unit price of power purchased that varies according to the amount of power purchased (amount of power purchased). Specifically, the larger the amount of power sold, the lower the unit price of power sold.

  Therefore, the calculator 151 of the power control apparatus 105 may calculate a power selling unit price (average power selling unit price) in the same manner as the power purchase unit price. Specifically, the calculator 151 calculates, for each operation target period, the average power selling unit price in the calculation target period based on the amount of power sold in the calculation target period and the electricity charge of the power sales power in the calculation target period. May be calculated. Then, the selector 152 of the power control apparatus 105 may select one of the power sale priority operation and the charge priority operation according to the average power sale unit price and the average power purchase unit price in the calculation target period.

  For example, the selector 152 of the power control device 105 selects the charge priority operation when the power selling unit price is lower than the average power purchasing unit price, and when the power selling unit price is not lower than the average power purchasing unit price, Select the priority action. As a result, the power sale priority operation and the charge priority operation are appropriately selected. Note that the case where the power sale unit price is not lower than the average power purchase unit price is, for example, the case where the power sale unit price is higher than the average power purchase unit price, or the case where the power sale unit price is the same as the average power purchase unit price.

  The selector 152 may select the charge priority operation when the power sale unit price is lower than the average power purchase unit price by a predetermined value or more, and when the power sale unit price is not lower than the average power purchase unit price by a predetermined value or more, The power priority operation may be selected. The predetermined value may be a positive value, 0, or a negative value. Moreover, said predetermined value may be defined based on the loss of the electric power in charging / discharging.

  Basically, the power control apparatus 105 continuously performs one operation selected from the power sale priority operation and the charge priority operation during the operation target period. However, when the charge system is changed during the operation target period, the power control device 105 may recalculate the average power purchase unit price and reselect one of the power sale priority operation and the charge priority operation. Thereby, the power control apparatus 105 can appropriately select one of the power sale priority operation and the charge priority operation according to the new fee structure.

  Although the power control apparatus 105 according to the present invention has been described based on the embodiments and the like, the present invention is not limited to the above-described embodiments and the like. Forms obtained by subjecting the above embodiments and the like to modifications conceived by those skilled in the art and other forms realized by arbitrarily combining a plurality of components in the above embodiments and the like are also included in the present invention. It is.

  For example, another component may execute a process executed by a specific component. In addition, the order in which the processes are executed may be changed, or a plurality of processes may be executed in parallel.

  In addition, the present invention can be realized not only as the power control apparatus 105 but also as a method including steps (processes) performed by each component constituting the power control apparatus 105.

  For example, these steps may be performed by a computer (computer system). The present invention can be realized as a program for causing a computer to execute the steps included in these methods. Furthermore, the present invention can be realized as a non-transitory computer-readable recording medium such as a CD-ROM on which the program is recorded.

  For example, when the present invention is realized by a program (software), each step is executed by executing the program using hardware resources such as a CPU, a memory, and an input / output circuit of a computer. . That is, each step is executed by the CPU obtaining data from a memory or an input / output circuit or the like, and outputting the calculation result to the memory or the input / output circuit or the like.

  Further, the plurality of components included in the power control device 105 and the like may be realized as dedicated or general-purpose circuits, respectively. These components may be realized as a single circuit or may be realized as a plurality of circuits.

  Further, the plurality of components included in the power control device 105 and the like may be realized as an LSI (Large Scale Integration) which is an integrated circuit (IC: Integrated Circuit). These components may be individually made into one chip, or may be made into one chip so as to include a part or all of them. The LSI may be referred to as a system LSI, a super LSI, or an ultra LSI depending on the degree of integration.

  The integrated circuit is not limited to an LSI, and may be realized by a dedicated circuit or a general-purpose processor. A programmable programmable gate array (FPGA) or a reconfigurable processor in which connection and setting of circuit cells inside the LSI can be reconfigured may be used.

  Furthermore, if an integrated circuit technology that replaces LSI appears due to the advancement of semiconductor technology or another derivative technology, naturally, using that technology, a plurality of components included in the power control device 105 can be integrated. It may be broken.

  Finally, a plurality of modes such as the power control device 105 are shown as examples. These aspects may be appropriately combined. In addition, any configuration or the like shown in the above embodiment may be added.

(First aspect)
The power control apparatus 105 according to one aspect of the present invention includes a calculator 151, a selector 152, and a controller 153, and selects one of the charge priority operation and the power sale priority operation for each operation target period.

  Here, the charge priority operation is an operation that prioritizes the charge operation over the power selling operation. The power sale priority operation is an operation that prioritizes the power sale operation over the charge operation. The power selling operation is an operation of outputting surplus power to the power system 114 as sold power. The charging operation is an operation for charging the power storage device 110 with surplus power. The surplus power is power obtained by removing demand power from the power generated by the distributed power source 101.

  The calculator 151 calculates, for each operation target period, an average power purchase that is an average unit price of the purchased power in the calculation target period according to the amount of purchased power in the calculation target period and the electricity charge of the purchased power in the calculation target period. Calculate the unit price. Here, the calculation target period is a period before the operation target period and is longer than the previous operation target period.

  For each operation target period, the selector 152 selects one of the power sale priority operation and the charge priority operation according to the relationship between the average power purchase price calculated by the calculator 151 and the power sale unit price that is the unit price of the power sale power. select. The controller 153 performs one selected by the selector 152 from the power sale priority operation and the charge priority operation for each operation target period.

  Thereby, the power control apparatus 105 can appropriately select the operation in the operation target period from the power sale priority operation and the charge priority operation according to the average power purchase unit price in the calculation target period longer than the previous operation target period. Therefore, the power control apparatus 105 can suppress hunting and can appropriately support effective use of surplus power.

(Second embodiment)
For example, the calculation target period before the operation target period may include two or more operation target periods before the operation target period. As a result, the power control apparatus 105 can sufficiently include the period in which the power sale priority operation is performed and the period in which the charge priority operation is performed in the calculation target period. Therefore, the power control apparatus 105 can sufficiently reflect the result of the power sale priority operation and the result of the charge priority operation in the average power purchase price.

(Third aspect)
For example, the calculation target period before the operation target period may be equal to two or more operation target periods before the operation target period. Thereby, the calculation process for calculating an average power purchase unit price is simplified.

(4th aspect)
For example, the calculation target period before the operation target period may be equal to an even number of operation target periods before the operation target period. Thereby, the power control apparatus 105 can include the period in which the power sale priority operation is performed and the period in which the charge priority operation is performed to the same extent in the calculation target period when hunting occurs. Therefore, the power control apparatus 105 can appropriately select one of the power sale priority operation and the charge priority operation for the next operation target period.

(5th aspect)
For example, the power selling unit price may be an average unit price of power sold during the calculation target period. Then, the calculator 151 may calculate the power selling unit price for each operation target period based on the amount of power sold in the calculation target period and the electricity rate of the power sold in the calculation target period. Thereby, the power control apparatus 105 can appropriately select one of the power sale priority operation and the charge priority operation even when the power sale unit price fluctuates.

(Sixth aspect)
For example, the selector 152 may select the charge priority operation when the power sale unit price is lower than the average power purchase unit price. Then, the selector 152 may select the power sale priority operation when the power sale unit price is not lower than the average power purchase unit price. Thereby, the power control apparatus 105 can appropriately select one of the power sale priority operation and the charge priority operation appropriately according to the relationship between the power sale unit price and the average power purchase unit price.

(Seventh aspect)
For example, the controller 153 may perform one of the power sale priority operation and the charge priority operation selected by the selector 152 by controlling the amount of power charged in the power storage device 110. Thereby, the power control device 105 can appropriately perform the power sale priority operation or the charge priority operation by controlling the charge / discharge of the power storage device 110.

(Eighth aspect)
A power control system 100 according to one embodiment of the present invention includes a power control device 105, a distributed power supply 101, and a power storage device 110. Thereby, in the power control system 100 including the power control device 105, the distributed power supply 101, and the power storage device 110, the power sale priority operation and the charge priority operation are appropriately performed.

(Ninth aspect)
The power control method according to an aspect of the present invention includes a calculation step (S201), a selection step (S202), and a control step (S203), and selects one of the charge priority operation and the power sale priority operation for each operation target period. It is a method to do.

  Here, the charge priority operation is an operation that prioritizes the charge operation over the power selling operation. The power sale priority operation is an operation that prioritizes the power sale operation over the charge operation. The power selling operation is an operation of outputting surplus power to the power system 114 as sold power. The charging operation is an operation for charging the power storage device 110 with surplus power. The surplus power is power obtained by removing demand power from the power generated by the distributed power source 101.

  In the calculation step (S201), for each operation target period, an average that is the average unit price of the purchased power in the calculation target period according to the amount of purchased power in the calculation target period and the electricity charge of the purchased power in the calculation target period. Calculate the electricity purchase unit price. The calculation target period is a period before the operation target period and is longer than the previous operation target period.

  In the selection step (S202), for each operation target period, according to the relationship between the average power purchase price calculated in the calculation step (S201) and the power sale unit price that is the unit price of the power sale power, the power sale priority operation and the charge priority. Select one of the actions. In the control step (S203), one selected from the power sale priority operation and the charge priority operation in the selection step (S202) is performed for each operation target period.

  Accordingly, the operation in the operation target period is appropriately selected from the power sale priority operation and the charge priority operation according to the average power purchase unit price in the calculation target period longer than the previous operation target period. Therefore, hunting is suppressed and effective use of surplus power is appropriately supported.

(10th aspect)
A program according to an aspect of the present invention is a program for causing a computer to execute the above power control method. Accordingly, the computer can execute the power control method according to the program.

DESCRIPTION OF SYMBOLS 100 Power control system 101 Distributed power supply 105 Power control apparatus 110 Power storage apparatus 114 Power system 151 Calculator 152 Selector 153 Controller 211, 212, 213, 214, 215, 216 Operation target period 223, 224, 225, 226 Calculation target period

Claims (10)

A charge priority operation that prioritizes a charging operation that charges the power storage device with the surplus power over a power selling operation that outputs the surplus power excluding demand power out of the generated power of the distributed power source to the power system as sold power; and A power control device that selects and performs one operation for each operation target period from the power sale priority operation that prioritizes the power sale operation over the charge operation,
For each operation target period, the amount of electric power purchased in the calculation target period, which is a period before the operation target period and is longer than the operation target period before the operation target period, and in the calculation target period A calculator that calculates an average power purchase unit price that is an average unit price of the power purchase power in the calculation target period according to the electricity charge of the power purchase power;
For each operation target period, according to the relationship between the average power purchase unit price calculated by the calculator and a power sale unit price that is a unit price of the power sale power, one of the power sale priority operation and the charge priority operation is selected. A selector to select;
A controller that performs the one selected by the selector from the power sale priority operation and the charge priority operation for each operation target period. The power control apparatus according to claim 1, wherein the calculation target period before the operation target period includes two or more operation target periods before the operation target period. The power control apparatus according to claim 1, wherein the calculation target period before the operation target period is equal to two or more operation target periods before the operation target period. The power control device according to claim 1, wherein the calculation target period before the operation target period is equal to an even number of operation target periods before the operation target period. The power selling unit price is an average unit price of the power selling power in the calculation target period,
The calculator calculates the power selling unit price for each operation target period based on an amount of the power selling power in the calculation target period and an electric charge of the power selling power in the calculation target period. Item 5. The power control apparatus according to any one of Items 1 to 4. The selector selects the charge priority operation when the power sale unit price is lower than the average power purchase unit price, and selects the power sale priority operation when the power sale unit price is not lower than the average power purchase unit price. The power control apparatus according to any one of claims 1 to 5. The controller performs one of the power sale priority operation and the charge priority operation selected by the selector by controlling an amount of power charged in the power storage device. The power control apparatus according to any one of the above. A power control device according to claim 1;
The distributed power source;
A power control system comprising the power storage device. A charge priority operation that prioritizes a charging operation that charges the power storage device with the surplus power over a power selling operation that outputs the surplus power excluding demand power out of the generated power of the distributed power source to the power system as sold power; and , A power control method for performing power selection by selecting one for each operation target period from the power sale priority operation that prioritizes the power sale operation over the charge operation,
For each operation target period, the amount of electric power purchased in the calculation target period, which is a period before the operation target period and is longer than the operation target period before the operation target period, and in the calculation target period A calculation step of calculating an average power purchase unit price that is an average unit price of the power purchase power in the calculation target period according to the electricity charge of the power purchase power;
For each operation target period, according to the relationship between the average power purchase unit price calculated in the calculation step and a power sale unit price that is a unit price of the power sale power, one of the power sale priority operation and the charge priority operation is selected. A selection step to select;
And a control step of performing the one selected in the selection step from the power sale priority operation and the charge priority operation for each operation target period.   A program for causing a computer to execute the power control method according to claim 9.

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