Power control device, power control system, and power control method

Abstract

To provide a power control device capable of preventing a power value of a consumer facility from exceeding a target value and preventing reverse power flow simultaneously while avoiding penalties such as paying a surcharge to a power system.SOLUTION: This power control device 3 includes: a power consumption value acquisition unit 30 that acquires power consumption 40 of a consumer facility 4; an output power value acquisition unit 31 that acquires an output power 41 of a generation facility 1; and a control unit 33 that controls the power from the generation facility 1 and a charging / discharging power of a power storage device 2 so that the power value of the consumer facility 4 does not exceed a target power value 46 and so that no reverse power flow occurs, in which the control unit 33 is constituted so as to acquire a target charge amount index value 43 which is an index value of the charge amount to be a target of the power storage device 2 based on the acquired value of the power consumption 40 of the consumer facility 4 and the acquired value of the output power 41 of the power generation facility 1.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a power control device, a power control system, and a power control method, and more particularly to a power control device, a power control system, and a power control method for controlling power of a customer facility including a power generation facility and a power storage facility. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a power control device that controls power of a customer facility that includes a power generation facility and a power storage device (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a storage battery control device including a storage battery control device, a storage battery, a load, and a private power generator. In the configuration disclosed in the above-mentioned Patent Document 1, the storage battery control device calculates an upper limit value of the received power based on a demand forecast value of the load and a power generation forecast value of the private power generator. The above-mentioned Patent Document 1 also discloses a configuration in which the upper limit value of the received power is adjusted based on the demand forecast value, the power generation forecast value, and the charge amount of the storage battery, and the charge amount of the storage battery is controlled so that the peak cut of the power consumption of the load (suppressing the power consumption of the load from exceeding the contract power with the power grid) is not impossible. Specifically, the above-mentioned Patent Document 1 discloses a configuration in which, when the charge amount from the private power generator to the storage battery is reduced, the power required for the peak cut is purchased from the power grid and the charge amount of the storage battery is increased so that the peak cut can be performed even if the power demand forecast and the actual power demand do not match.

[0004] Furthermore, the above-mentioned Patent Document 1 discloses a configuration for controlling reverse power flow to flow surplus power to the power grid when a private generator generates power that is greater than the capacity that a storage battery can charge. However, due to restrictions on the power grid, there are cases where reverse power flow, in which power from a private generator flows to the power grid, cannot be performed. For this reason, the above-mentioned Patent Document 1 discloses a configuration for preventing reverse power flow to the power grid when reverse power flow cannot be performed by charging a storage battery with the surplus amount of power generated from the private generator. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6977196 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, in the configuration disclosed in the above-mentioned Patent Document 1, in order to perform peak shaving of the load (customer facility) (so that the power consumption value of the customer facility does not exceed the target power value) even when the power demand forecast does not match the actual power demand, the shortage of the charge amount to the storage battery (power storage device) is purchased from the power grid from the private generator (power generation facility) and the charge amount of the power storage device is increased. However, when purchasing power exceeding a preset value from the power grid, a penalty such as paying a surcharge may occur. In order to avoid a penalty such as paying a surcharge when purchasing from the power grid the shortage of the charge amount to the power storage device for performing peak shaving, it is considered to increase the power contracted with the power grid in advance within a range cheaper than the surcharge due to the penalty. However, if the power contracted with the power grid is increased in preparation for peak shaving, there is an inconvenience that the contracted power becomes too large for the average power consumption of the customer facility. In addition, when the power generation facility cannot perform reverse power flow to the power system due to the constraints of the power system, if the shortage of the charge amount for peak shaving is purchased from the power system and the charge amount of the power storage device is increased, and then the power generation amount of the power generation facility increases, the power storage device cannot be charged, and it becomes difficult to process the surplus power. Therefore, as in the configuration disclosed in the above Patent Document 1, when purchasing power from the power system to increase the charge amount of the power storage device in order to prevent the power value of the consumer facility from exceeding the target value, there is a problem that it is difficult to simultaneously prevent the power value of the consumer facility from exceeding the target value and prevent the occurrence of reverse power flow in which power flows from at least one of the power generation facility and the power storage device to the power system.

[0007] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a power control device that can simultaneously prevent the power value of a consumer facility from exceeding a target value and prevent reverse power flow, while avoiding penalties such as paying a surcharge to the power grid. [Means for solving the problem]

[0008] In order to achieve the above object, a power control device according to a first aspect of the present invention is a power control device that controls the power of a consumer equipment including a power generation equipment that generates power and a power storage device that can charge and discharge the power, and is equipped with a power consumption value acquisition unit that acquires a predicted value or measured value of the power consumption of the consumer equipment, an output power value acquisition unit that acquires a predicted value or measured value of the output power of the power generation equipment, and a control unit that controls the power from the power generation equipment and the power charged and discharged by the power storage device so that the power value of the consumer equipment does not exceed a target power value, and controls the power from the power generation equipment and the power charged and discharged by the power storage device so that a reverse flow of power flows from at least one of the power generation equipment and the power storage device to the power system, and is configured to acquire a target charge amount index value that is an index value of a target charge amount of the power storage device, based on the acquired value of the power consumption of the consumer equipment acquired by the power consumption value acquisition unit and the acquired value of the output power of the power generation equipment acquired by the output power value acquisition unit.

[0009] In the power control device according to the first aspect of the present invention, as described above, the control unit is configured to acquire a target charge amount index value, which is an index value of a target charge amount of the power storage device, based on the acquired value of the power consumption of the consumer facility acquired by the power consumption value acquisition unit and the acquired value of the output power of the power generation facility acquired by the output power value acquisition unit, so that the power value of the consumer facility does not exceed the target power value and reverse power flow does not occur. Here, in order to prevent the power value of the consumer facility from exceeding the target power value, the excess from the target power value can be supplied from the power storage device. Also, in order to prevent reverse power flow, in which power flows from at least one of the power generation facility and the power storage device to the power system, the surplus power can be stored in the power storage device. Therefore, in order to prevent the power value of the consumer facility from exceeding the target power value and to prevent reverse power flow, the charge amount of the power storage device can be adjusted so that the excess or shortage of power can be covered by charging and discharging the power storage device. Therefore, as described above, by configuring to acquire a target charge amount index value, which is an index value of a target charge amount for the power storage device, it is possible to control the charge / discharge amount of the power storage device based on a target charge amount index value such that the power value of the consumer equipment does not exceed the target power value and reverse power flow does not occur, thereby making it possible to prevent the charge amount of the power storage device from becoming insufficient or excessive. As a result, it is possible to simultaneously prevent the power value of the consumer equipment from exceeding the target value and prevent the reverse power flow in which power flows from at least one of the power generation equipment and the power storage device to the power system, while avoiding penalties such as paying a surcharge to the power system.

[0010] In the power control device according to the first aspect, the control unit is preferably configured to correct the charge / discharge output of the power storage device so that a current charge amount index value, which is an index value of the current charge amount of the power storage device, approaches a target charge amount index value. With this configuration, the charge / discharge of the power storage device is controlled so that the current charge amount of the power storage device becomes the charge amount of the target charge amount index value, so that the charge amount of the power storage device can be controlled to a charge amount that can cover the surplus or shortage of power so that the power value of the consumer facility does not exceed the target power value and reverse power flow does not occur. As a result, it is possible to easily prevent the power value of the consumer facility from exceeding the target power value and the occurrence of reverse power flow.

[0011] In this case, the control unit is preferably configured to change the target charge amount index value based on the relationship between the magnitude of the acquired value of the output power of the power generation facility and the magnitude of the acquired value of the power consumption of the consumer facility. With this configuration, the target charge amount index value is changed based on the relationship between the magnitude of the acquired value of the output power of the power generation facility and the magnitude of the acquired value of the power consumption of the consumer facility, so that the target charge amount index value can be changed according to the magnitude of the actually acquired output power of the power generation facility and the magnitude of the power consumption of the consumer facility. Therefore, compared to a configuration in which the charge amount of the power storage device is adjusted in advance based on the predicted value of the output power of the power generation facility and the predicted value of the power consumption of the consumer facility set on the previous day, for example, the target charge amount index value can be adjusted with precision, so that the charge amount of the power storage device can be accurately adjusted to a value that can prevent the power value of the consumer facility from exceeding the target power value and the occurrence of reverse power flow. As a result, it is possible to further prevent the power value of the consumer facility from exceeding the target power value and the occurrence of reverse power flow.

[0012] In the above-mentioned configuration in which the control unit changes the target charge amount index value based on the relationship between the magnitude of the acquired value of the output power of the power generation facility and the magnitude of the acquired value of the power consumption of the consumer facility, the control unit is preferably configured to determine whether reverse power flow will occur and whether peak power cutting is necessary based on the relationship between the magnitude of the acquired value of the output power of the power generation facility and the magnitude of the acquired value of the power consumption of the consumer facility, and to control the target charge amount index value to be changed to a smaller value when reverse power flow is likely to occur, and to control the target charge amount index value to be changed to a larger value when peak power cutting is necessary. With this configuration, when reverse power flow is likely to occur, the target charge amount index value is changed to a smaller value, so that the charge amount of the power storage device can be controlled so that the charge amount of the power storage device is reduced. Therefore, even if surplus power is output by the power generation facility, it is possible to increase the capacity of power that can be stored in the power storage device (chargeable capacity), so that the occurrence of reverse power flow can be easily suppressed. Furthermore, when peak power cutting is necessary, the target charge amount index value is changed to a larger value, so that the amount of power required for peak power cutting can be stored in the power storage device. Therefore, when peak power shaving is required, it is possible to supply power from the power storage device to the load, and thus peak power shaving can be easily performed. As a result, it is possible to easily achieve both suppression of reverse power flow and peak power shaving.

[0013] In this case, the control unit is preferably configured to acquire a target charge amount index value based on an adjustment value for adjusting the degree of influence of the acquired value of the output power of the power generation facility, the acquired value of the output power of the power generation facility, and the acquired value of the power consumption of the consumer facility. Here, the power consumption of the consumer facility rarely changes significantly from the power consumption predicted in advance. On the other hand, for example, when the power generation facility is a power generation facility using renewable energy such as a solar power generation facility, the output power output from the power generation facility fluctuates greatly depending on the weather. Therefore, by configuring as described above, it is possible to adjust the degree of influence of the output power of the power generation facility with large fluctuations in the output power of the power, so that the target charge amount index value can be accurately adjusted to a value suitable for suppressing reverse power flow and cutting peak power.

[0014] In the configuration in which the control unit acquires the target charge amount index value based on an adjustment value for adjusting the influence degree of the acquired value of the output power of the power generation facility, the acquired value of the output power of the power generation facility, and the acquired value of the power consumption of the consumer facility, the control unit is preferably configured to acquire an adjusted output value that is an output value after adjustment of the power generation facility by dividing the acquired value of the output power of the power generation facility by the adjustment value, and to calculate the target charge amount index value based on the adjusted output value and the acquired value of the power consumption of the consumer facility. With this configuration, it is possible to easily acquire a target charge amount index value that can accurately achieve both the suppression of reverse power flow and the peak cut of power.

[0015] In order to achieve the above object, a power control system according to a second aspect of the present invention comprises a power generation equipment that generates power, a power storage device capable of charging and discharging the power, a power consumption value acquisition unit that acquires a predicted value or measured value of power consumption of consumer equipment that consumes the power, an output power value acquisition unit that acquires a predicted value or measured value of output power of the power generation equipment, and a control unit that controls the power of the power generation equipment and the power charged and discharged by the power storage device so that the power value of the consumer equipment does not exceed a target power value, and controls the power from the power generation equipment and the power charged and discharged by the power storage device so that a reverse flow of power flows from at least one of the power generation equipment and the power storage device to the power system is not generated, and the control unit is configured to acquire a target charge amount index value that is an index value of a target charge amount of the power storage device, based on the acquired value of the power consumption of the consumer equipment acquired by the power consumption value acquisition unit and the acquired value of the output power of the power generation equipment acquired by the output power value acquisition unit.

[0016] In the power control system according to the second aspect of the present invention, as described above, the control unit is configured to acquire a target charge amount index value, which is an index value of a target charge amount of the power storage device, based on the acquired value of the power consumption of the consumer equipment acquired by the power consumption value acquisition unit and the acquired value of the output power of the power generation equipment acquired by the output power value acquisition unit, so that the power value of the consumer equipment does not exceed the target power value and reverse power flow does not occur. As a result, like the power control device according to the first aspect, it is possible to provide a power control system that can simultaneously prevent the power value of the consumer equipment from exceeding the target value and prevent reverse power flow from occurring, while avoiding penalties such as paying a surcharge to the power system.

[0017] In the power control system according to the second aspect, the power generation facility is preferably a renewable energy power generation facility that utilizes renewable energy, the output power value acquisition unit is configured to acquire an output prediction value or a measured value of the output power of the renewable energy power generation facility, and the control unit is configured to calculate a target charge amount index value based on the acquired value of the output power of the renewable energy power generation facility and the acquired value of the power consumption of the consumer facility. With this configuration, in a power control system equipped with renewable energy power generation facility with large fluctuations in output power, it is possible to simultaneously suppress the power value of the consumer facility from exceeding the target value and prevent the occurrence of a reverse power flow in which power flows from at least one of the power generation facility and the power storage device to the power grid.

[0018] In order to achieve the above object, a power control method according to a third aspect of the present invention includes the steps of: acquiring a predicted value or measured value of power consumption of consumer equipment that consumes power; acquiring a predicted value or measured value of output power of power generation equipment that generates power; and controlling the power of the power generation equipment and the power charged and discharged by a power storage device that can charge and discharge power so that the power value of the consumer equipment does not exceed a target power value, and controlling the power of the power generation equipment and the power charged and discharged by the power storage device so that a reverse power flow in which power flows from at least one of the power generation equipment and the power storage device to the power system does not occur. In the step of controlling the power of the power generation equipment and the power charged and discharged by the power storage device, a target charge amount index value, which is an index value of the target charge amount of the power storage device, is acquired based on the acquired value of the power consumption of the consumer equipment and the acquired value of the output power of the power generation equipment.

[0019] In the power control system according to the third aspect of the present invention, as described above, in the step of controlling the power of the power generation facility and the power charged / discharged by the power storage facility so that the power value of the consumer facility does not exceed the target power value and reverse power flow does not occur, a target charge amount index value, which is an index value of the target charge amount of the power storage facility, is acquired based on the acquired value of the power consumption of the consumer facility and the acquired value of the output power of the power generation facility. As a result, like the power control device according to the first aspect, it is possible to provide a power control method that can simultaneously suppress the power value of the consumer facility from exceeding the target value and prevent reverse power flow while avoiding penalties such as paying a surcharge to the power system. Effect of the Invention

[0020] According to the present invention, as described above, it is possible to achieve both preventing the power value of a consumer facility from exceeding a target value while avoiding penalties such as paying a surcharge to the power grid, and preventing the occurrence of reverse power flow in which power flows from at least one of a power generation facility and a power storage device to the power grid. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic diagram of a power control system including a power control device according to one embodiment. [Diagram 2] FIG. 2 is a block diagram of a power control device according to one embodiment. [Diagram 3] 1 is a graph for explaining a configuration for suppressing reverse power flow in which power flows from a power conversion system to a power grid. [Figure 4] 1 is a graph for explaining a configuration for performing peak shaving of power consumption by customer facilities. [Diagram 5] 4 is a graph for explaining power control by a power control device according to an embodiment. [Figure 6]1 is a matrix diagram for explaining output power, power consumption, and possible risks when a target charge amount index value is changed in a power control device according to an embodiment. FIG. [Figure 7] 1 is a three-dimensional graph showing the relationship between a target charge amount index value, output power, and power consumption in one embodiment. [Figure 8] 1 is a block diagram for explaining a configuration in which a power control device according to an embodiment calculates a target charge amount index value. [Figure 9] 1 is a block diagram for explaining a configuration in which a power control device according to an embodiment calculates a storage battery charge / discharge command value. [Figure 10] 1 is a block diagram for explaining a configuration in which a power control device according to an embodiment calculates a storage battery discharge command value. [Figure 11] 1 is a block diagram for explaining a configuration in which a power control device according to an embodiment calculates a storage battery charging command value. [Figure 12] 1 is a block diagram for explaining a configuration in which a power control device according to an embodiment calculates a storage battery SOC correction value. [Figure 13] 1 is a block diagram for explaining a configuration in which a power control device according to an embodiment calculates a correction value upper limit command value. [Figure 14] 1 is a block diagram for explaining a configuration in which a power control device according to an embodiment calculates a correction value lower limit command value. [Figure 15] 4 is a flowchart illustrating a process of controlling power of a power control device according to an embodiment. [Figure 16] 4 is a flowchart illustrating a process in which a power control device according to an embodiment controls charging and discharging of the power control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0023] The configuration of a power control system 100 including a power control device 3 according to an embodiment of the present invention will be described with reference to FIGS.

[0024] First, the configuration of a power control system 100 will be described with reference to Fig. 1. The power control system 100 includes a power generation facility 1, a power storage device 2, and a power control device 3. The power control device 3 is a power control device that controls the power of a consumer facility 4 that includes the power generation facility 1 that generates power, and the power storage device 2 that can charge and discharge the power.

[0025] Specifically, the power control device 3 controls the power when the power from the power grid 200 and the power generation facility 1 are supplied to the power storage facility 2 and the customer facility 4.

[0026] In this embodiment, the power generation facility 1 is a renewable energy power generation facility that uses renewable energy. Specifically, the power generation facility 1 is a solar power generation facility that uses sunlight as renewable energy.

[0027] In this embodiment, the power storage device 2 is, for example, a storage battery.

[0028] In this embodiment, the customer facility 4 includes, for example, a plurality of power consuming facilities installed in a factory and operated by power. That is, the power control system 100 is a system that controls the power of the customer facility 4 installed in the factory.

[0029] As shown in FIG. 2, the power control device 3 includes a power consumption value acquisition unit 30, an output power value acquisition unit 31, a charge amount information acquisition unit 32, a control unit 33, and a storage unit .

[0030] The power consumption value acquisition unit 30 is configured to acquire a predicted value or a measured value of the power consumption 40 of the consumer facility 4. The power consumption value acquisition unit 30 may be configured to acquire a predicted value or a measured value of the power consumption 40 from each of the multiple consumer facilities 4, or may be configured to acquire a predicted value or a measured value of the total of the power consumption 40 of the multiple consumer facilities 4. In this embodiment, the power consumption value acquisition unit 30 is configured to acquire a measured value of the total of the power consumption 40 of the multiple consumer facilities 4. The power consumption value acquisition unit 30 measures the power at the power receiving point. Specifically, the power consumption value acquisition unit 30 is configured to acquire a value obtained by subtracting the output power 41 of the power generation facility 1 and the output power of the power storage device 2 from the total value of the power at the power receiving point as the power consumption 40 of the consumer facility 4. The power consumption value acquisition unit 30 includes, for example, a power measurement device.

[0031] The output power value acquiring unit 31 is configured to acquire an output predicted value or a measured value of the output power 41 of the power generation facility 1. In this embodiment, the output power value acquiring unit 31 is configured to acquire an output predicted value or a measured value of the output power 41 of the renewable energy power generation facility. In this embodiment, the output power value acquiring unit 31 is configured to acquire a measured value of the output power 41 of the power generation facility 1. The output power value acquiring unit 31 includes, for example, a power measuring device.

[0032] The charge amount information acquiring unit 32 is configured to acquire information on the charge amount of the power storage device 2. Specifically, the charge amount information acquiring unit 32 is configured to acquire values ​​of charge and discharge current and terminal voltage of the power storage device 2. The charge amount information acquiring unit 32 includes, for example, a sensor that detects the charge and discharge current of the power storage device 2 and a sensor that detects the terminal voltage of the power storage device 2.

[0033] The control unit 33 is configured to control the power from the power generation facility 1 and the power charged and discharged by the power storage device 2 so that the power value of the customer facility 4 does not exceed the target power value 46. The control unit 33 is also configured to control the power from the power generation facility 1 and the power charged and discharged by the power storage device 2 so that a reverse power flow in which power flows from at least one of the power generation facility 1 and the power storage device 2 to the power system 200 does not occur. The control unit 33 is configured, for example, by a processor such as a CPU (Central Processing Unit) and memories such as a ROM (Read Only Memory) and a RAM (Random Access Memory). Details of the configuration in which the control unit 33 controls the power from the power generation facility 1 and the power charged and discharged by the power storage device 2 will be described later.

[0034] In this embodiment, the control unit 33 is configured to acquire a target charge amount index value 43, which will be described later. The control unit 33 is configured to acquire a current charge amount index value 45, which will be described later. Details of the configuration in which the control unit 33 acquires the target charge amount index value 43 and the current charge amount index value 45 will be described later.

[0035] The storage unit 34 is configured to store the acquired value of the power consumption 40 acquired by the power consumption value acquisition unit 30. The storage unit 34 is also configured to store the acquired value of the output power 41 acquired by the output power value acquisition unit 31. The storage unit 34 is also configured to store an adjustment value 42 that adjusts the influence degree of the acquired value of the output power 41 of the power generation facility 1 described later. The storage unit 34 is also configured to store a target charge amount index value 43. The storage unit 34 is also configured to store a power value of a contract power 44 contracted between the power system 200 (see FIG. 1) and the customer facility 4 (see FIG. 1). The storage unit 34 is also configured to store a current charge amount index value 45. The storage unit 34 is also configured to store a target power value 46 that is an upper limit value of the power used by the customer facility 4. The storage unit 34 is also configured to store a margin 47 used when calculating a storage battery charge command value 51 (see FIG. 11) described later. The storage unit 34 includes a non-volatile storage device, such as a hard disk drive (HDD) or a solid state drive (SSD).

[0036] In this embodiment, the power control device 3 is configured as a PLC (Programmable Logic Controller) installed in a factory or the like.

[0037] (Suppression of reverse power flow and power peak shaving) Next, with reference to Figs. 3 to 5, a configuration for suppressing reverse power flow and a configuration for performing peak cut of power in the power control device 3 (see Fig. 2) according to this embodiment will be described.

[0038] In graph G1 shown in Fig. 3, the horizontal axis represents time and the vertical axis represents power. A solid line 60a in graph G1 indicates power consumption 40 (see Fig. 2) by customer facility 4 (see Fig. 1). A dashed line 60b in graph G1 indicates output power 41 (see Fig. 2) by power generation facility 1 (see Fig. 1).

[0039] As shown in the graph G1 of FIG. 3, the output power 41 of the power generation facility 1 exceeds the power consumption 40 of the customer facility 4 between time t1 and time t2. When the output power 41 of the power generation facility 1 exceeds the power consumption 40 of the customer facility 4, the power becomes surplus, and it is necessary to process the surplus power from time t1 to time t2 (power in the hatched area 60c). Possible ways to process the surplus power include performing reverse power flow to the power system 200 (see FIG. 1) and storing the power in the power storage device 2 (see FIG. 1). In order to perform reverse power flow, it is necessary to make a detailed contract regarding the determination of the reverse power flow destination, the time for performing reverse power flow, the power during reverse power flow, and the like. Therefore, in this embodiment, the power control device 3 is configured to perform control to store the surplus power in the power storage device 2, rather than performing reverse power flow to flow the surplus power in the area 60c from the power generation facility 1 to the power system 200. As a result, the power control device 3 (see FIG. 1) is configured to suppress reverse power flow.

[0040] In graph G2 shown in Fig. 4, the horizontal axis represents time and the vertical axis represents power. A solid line 61a in graph G2 indicates power consumption 40 (see Fig. 2) by customer equipment 4 (see Fig. 1). A dashed line 61b in graph G1 indicates target power value 46 (see Fig. 2). Target power value 46 is set to a power lower than contracted power 44 (see Fig. 2).

[0041] As shown in the graph G2 of FIG. 4, the power consumption 40 of the consumer facility 4 exceeds the target power value 46 between time t3 and time t4. When the power consumption 40 exceeds the target power value 46, the power supplied to the consumer facility 4 is insufficient, and new power is required. However, when power exceeding the contract power 44 is purchased from the power system 200 (see FIG. 1), a penalty such as a premium fee is incurred. In addition, in order to prevent the power consumption 40 from exceeding the target power value 46, it is possible to set the contract power 44 to a value corresponding to the power consumption 40 at the time when the power consumption 40 is large (peak time of the power consumption 40). However, if the value of the contract power 44 is increased in accordance with the peak of the power consumption 40, the basic fee for the power purchased from the power system 200 will increase. Therefore, in this embodiment, the power control device 3 is configured to perform control so that the power from time t3 to time t4 (power in the hatched area 61c) is covered by the power stored in the power storage device 2 (see FIG. 1) rather than by newly purchasing power from the power system 200. That is, the power control device 3 is configured to perform peak cutting of the power consumption 40 using the power from the power storage device 2.

[0042] In this embodiment, as shown in graph G3 in FIG. 5, the power control device 3 (see FIG. 1) is configured to suppress reverse power flow and perform peak power cutting by controlling the power storage device 2 (see FIG. 1).

[0043] In graph G3, the horizontal axis is time and the vertical axis is power. In graph G3, solid line 62a indicates output power 41 (see FIG. 2) of power generation facility 1 (see FIG. 1). In addition, in graph G3, thick line 62b indicates power consumption 40 (see FIG. 2) of customer facility 4 (see FIG. 1). In addition, dashed line 62c in graph G3 indicates target power value 46 (see FIG. 2). In addition, dashed line 62d in graph G3 indicates connection point power of power control system 100. Note that the connection point power is the total power of output power 41 from power generation facility 1 and power consumption 40 of customer facility 4.

[0044] In graph G3, the output power 41 from the power generation facility 1 and the power consumption 40 of the customer facility 4 are equal until time t5. Therefore, the interconnection point power is 0 (zero). Furthermore, in graph G3, the power consumption 40 of the customer facility 4 exceeds the output power 41 from the power generation facility 1 during the period from time t5 to time t6. The interconnection point power during the period from time t5 to time t6 is smaller than the target power value 46. Therefore, the power control device 3 (see FIG. 1) does not control the charging and discharging of the power storage device 2 until time t6.

[0045] In the graph G3, during the time period from time t6 to time t7, the output power 41 from the power generation facility 1 exceeds the power consumption 40 of the customer facility 4. That is, the power in the hatched area 62e becomes surplus power. Therefore, in this embodiment, the power control device 3 performs control to charge the power in the hatched area 62e to the power storage device 2. Therefore, the link point power becomes zero.

[0046] In addition, in graph G3, the output power 41 from the power generation facility 1 becomes 0 (zero) during the time period from time t7 to time t8. Furthermore, the power consumption 40 of the customer facility 4 becomes a value greater than 0 (zero). Therefore, the power consumption 40 of the customer facility 4 exceeds the output power 41 from the power generation facility 1. Therefore, the power in the hatched area 62f is insufficient. Therefore, in this embodiment, the power control device 3 controls the power storage device 2 to discharge the power in the hatched area 62f. Specifically, the power control device 3 controls the discharge of the power storage device 2 so that the link point power during the time period from time t7 to time t8 becomes the target power value 46.

[0047] In graph G3, from time t8 onwards, the output power 41 from the power generation facility 1 becomes 0 (zero), and the power consumption 40 of the customer facility 4 becomes equal to or less than the target power value 46. Therefore, the power control device 3 does not control the charging and discharging of the power storage device 2.

[0048] (Patterns of conditions for changing the target charge amount index value) In this embodiment, as shown in the graph G3, the power control device 3 is configured to control the charge amount of the power storage device 2 so as to suppress reverse power flow and perform peak power cut. Specifically, the control unit 33 (see FIG. 2) is configured to control the charge amount of the power storage device 2 by changing the target charge amount index value 43 (see FIG. 2). More specifically, the control unit 33 is configured to change the target charge amount index value 43 based on the relationship between the magnitude of the acquired value of the output power 41 (see FIG. 2) of the power generation facility 1 and the magnitude of the acquired value of the power consumption 40 of the customer facility 4 (see FIG. 1). In this embodiment, the control unit 33 is configured to determine whether reverse power flow will occur and whether peak power cut is necessary based on the relationship between the magnitude of the acquired value of the output power 41 of the power generation facility 1 and the magnitude of the acquired value of the power consumption 40 of the customer facility 4. The control unit 33 is configured to control the target charge amount index value 43 to be changed to a smaller value when there is a possibility of reverse power flow occurring, and to control the target charge amount index value 43 to be changed to a larger value when peak power cut is necessary.

[0049] The matrix diagram M1 shown in Fig. 6 indicates the magnitude of the output power 41 (see Fig. 2) of the power generation facility 1 (see Fig. 1), the magnitude of the power consumption 40 (see Fig. 2) of the customer facility 4 (see Fig. 1), the presence or absence of a possible risk, and the magnitude of the target charge amount index value 43 (see Fig. 2) to be changed. The matrix diagram M1 includes a display field 70 for displaying the actual value of the output power 41, a display field 71 for displaying the actual value of the power consumption 40, a display field 72 for displaying the presence or absence of a risk, a display field 73 for displaying the magnitude of the target charge amount index value 43 to be changed, and a display field 74 for displaying a pattern number. In addition, the display field 72 for displaying the presence or absence of a risk includes a display field 72a for displaying the presence or absence of a reverse power flow, and a display field 72b for displaying the presence or absence of a peak cut of power.

[0050] Pattern 1 is a state in which the output power 41 is low and the power consumption 40 is low. In this case, there is a possibility that reverse power flow will occur, and it is not necessary to perform peak power shaving. Therefore, the target charge amount index value 43 is changed to a low value so that surplus power can be stored in preparation for reverse power flow. For example, the control unit 33 may lower the charge amount of the power storage device 2 in order to prevent reverse power flow of the output power 41 output from the power generation facility 1 during the daytime. In this case, the control unit 33 is configured to change the target charge amount index value 43 to a low value in a time period when the power consumption 40 is low, such as at night, in order to supply the power stored in the power storage device 2 to the consumer facility 4 and to lower the charge amount of the power storage device 2.

[0051] Pattern 2 is a state in which the output power 41 is low and the power consumption 40 is high. In this case, there is no possibility of reverse power flow occurring, and it is necessary to perform power peak cutting. Therefore, the target charge amount index value 43 is changed to a higher value so that the insufficient power can be discharged in preparation for the power peak cutting. For example, in the daytime, when the amount of sunlight irradiation is reduced due to cloudiness or the like, there is a possibility that the power will be insufficient depending on the power consumption 40. In this case, it is considered to perform peak cutting of the power consumption 40. Therefore, when the output power 41 from the power generation facility 1 is reduced, the control unit 33 changes the target charge amount index value 43 to a higher value in order to increase the amount of charge of the power storage device 2 in preparation for an increase in the power consumption 40.

[0052] Pattern 3 is a state in which the output power 41 is high and the power consumption 40 is low. In this case, there is a possibility that reverse power flow will occur, and it is not necessary to perform peak power shaving. Therefore, the target charge amount index value 43 is changed to a low value so that surplus power can be stored in preparation for reverse power flow. For example, in a time period during the day when the output power 41 from the power generation facility 1 increases, if the power consumption 40 decreases, such as by stopping part of the consumer facility 4, there is a possibility that the output power 41 from the power generation facility 1 will become surplus. In this case, it is considered that reverse power flow will occur. Therefore, in order to suppress the occurrence of reverse power flow, the control unit 33 changes the target charge amount index value 43 to a low value, and performs control to reduce the charge amount of the power storage device 2 so that the power storage device 2 can store the surplus power.

[0053] Pattern 4 is a state in which the output power 41 is high and the power consumption 40 is high. In this case, there is a possibility that reverse power flow will occur, and it is not necessary to perform peak power shaving. Therefore, the target charge amount index value 43 is changed to a lower value so that surplus power can be stored in preparation for reverse power flow. For example, in a time period during the day when the output power 41 from the power generation facility 1 increases, if the operation rate of the consumer facility 4 increases and the power consumption 40 increases, there is a possibility that the output power 41 from the power generation facility 1 will become surplus. In this case, it is considered that reverse power flow will occur. Therefore, in order to suppress the occurrence of reverse power flow, the control unit 33 changes the target charge amount index value 43 to a lower value, and performs control to reduce the charge amount of the power storage device 2 so that the power storage device 2 can store the surplus power.

[0054] In this embodiment, in order to achieve both suppression of reverse power flow and power peak cutting, the control unit 33 changes the target charge amount index value 43 according to the above four patterns and controls charging and discharging of the power storage device 2.

[0055] In this embodiment, the power generation facility 1 is a renewable energy power generation facility that uses renewable energy such as solar power. Therefore, the output power 41 from the power generation facility 1 changes from moment to moment. Therefore, the control unit 33 does not judge the power consumption 40 and the output power 41 by comparing them with a threshold value, but judges them as seamless value changes. That is, the control unit 33 (see FIG. 2) changes the target charge amount index value 43 based on a three-dimensional surface 63 that shows the relationship between the power consumption 40 (see FIG. 2), the output power 41 (see FIG. 2), and the target charge amount index value 43 (see FIG. 2), as shown in the graph G4 in FIG. 7.

[0056] In graph G4, the vertical axis represents the target charge amount index value 43, one horizontal axis represents the power consumption 40, and the other horizontal axis represents the output power 41. A surface 63 shown in graph G4 is a surface representing the target charge amount index value 43 that is set based on the magnitude of the acquired value of the power consumption 40 and the magnitude of the acquired value of the output power 41. The control unit 33 acquires the target charge amount index value 43 based on the acquired value of the power consumption 40, the acquired value of the output power 41, and the surface 63. Specifically, the control unit 33 acquires, as the target charge amount index value 43, an index value according to the position of the surface 63 when the acquired value of the power consumption 40 and the acquired value of the output power 41 are plotted.

[0057] (Getting the target charge amount index value) Specifically, as shown in FIG. 8, the control unit 33 (see FIG. 2) is configured to acquire a target charge amount index value 43, which is an index value of a target charge amount of the power storage device 2, based on an acquired value of the power consumption 40 of the consumer facility 4 (see FIG. 1) acquired by the power consumption value acquisition unit 30 (see FIG. 2) and an acquired value of the output power 41 of the power generation facility 1 (see FIG. 1) acquired by the output power value acquisition unit 31 (see FIG. 2). In this embodiment, the control unit 33 is configured to acquire the target charge amount index value 43 based on an adjustment value 42 that adjusts the influence degree of the acquired value of the output power 41 of the power generation facility 1, the acquired value of the output power 41 of the power generation facility 1, and the acquired value of the power consumption 40 of the consumer facility 4. The adjustment value 42 is, for example, a value of 1 to 10, and is changed according to the acquired value of the power consumption 40 and the acquired value of the output power 41. The adjustment value 42 may be changed according to a relationship between the acquired value of the power consumption 40 and the acquired value of the output power 41, which is acquired experimentally in advance, or may be changed according to a user setting.

[0058] In addition, in this embodiment, the control unit 33 is configured to calculate a target charging amount index value 43 based on the acquired value of the output power 41 of the renewable energy power generation equipment and the acquired value of the power consumption 40 of the consumer equipment 4.

[0059] As shown in the calculation block diagram CB1 in Fig. 8, the control unit 33 divides the acquired value of the output power 41 of the power generation facility 1 by the adjustment value 42 to acquire an adjusted output value, which is an output value after adjustment of the power generation facility 1. The control unit 33 is also configured to calculate a target charging amount index value 43 based on the adjusted output value and the acquired value of the power consumption 40 of the consumer facility 4. Specifically, the control unit 33 acquires the target charging amount index value 43 by dividing a value obtained by subtracting the square of the adjusted output value from 1 by a value obtained by squaring the acquired value of the power consumption 40.

[0060] The calculation block diagram CB1 can be expressed by the following formula (1).

number

[0061] For example, if the acquired value of the power consumption 40 is "1.00", the acquired value of the output power 41 is "1.00", and the adjustment value 42 is "1", the target charge amount index value 43 is "0 (zero)". Also, if the acquired value of the power consumption 40 is "1.00", the acquired value of the output power 41 is "1.00", and the adjustment value 42 is "10", the target charge amount index value 43 is "0.99".

[0062] (Obtaining command values ​​to control the power storage device) Next, a configuration in which the control unit 33 (see FIG. 2) controls charging and discharging of the power storage device 2 (see FIG. 1) will be described with reference to Fig. 9 to Fig. 14. In the example shown in Fig. 9 to Fig. 14, discharging is taken as positive and charging is taken as negative.

[0063] In this embodiment, as shown in the calculation block diagram CB2 in Fig. 9, the control unit 33 (see Fig. 2) is configured to acquire the storage battery charge / discharge command value 53. The control unit 33 is also configured to control the charging / discharging of the power storage device 2 (see Fig. 1) based on the acquired storage battery charge / discharge command value 53.

[0064] When the storage battery charge / discharge command value 53 is a positive value, the control unit 33 performs control to discharge power from the power storage device 2. When the storage battery charge / discharge command value 53 is a negative value, the control unit 33 performs control to charge power to the power storage device 2. Even if the storage battery charge / discharge command value 53 is a positive value, if power is not being charged to the power storage device 2, the control unit 33 does not perform control to discharge power from the power storage device 2. Even if the storage battery charge / discharge command value 53 is a negative value, if the charged amount of the power storage device 2 is high and new power cannot be charged, the control unit 33 does not perform control to charge power to the power storage device 2.

[0065] As shown in calculation block diagram CB2, control unit 33 is configured to acquire battery charge / discharge command value 53 based on battery discharge command value 50, battery charge command value 51, and battery SOC (State Of Charge) correction value 52. Specifically, control unit 33 acquires battery charge / discharge command value 53 by adding battery discharge command value 50, battery charge command value 51, and battery SOC correction value 52 together.

[0066] The battery discharge command value 50 is a command value when discharging power from the power storage device 2 in order to cut peak power. The battery charge command value 51 is a command value when storing power in the power storage device 2 in order to suppress reverse power flow. The battery SOC correction value 52 is a value for correcting the charge amount of the power storage device 2. An upper limit 53a of the battery charge / discharge command value 53 is set to a PCS (Power Conditioning System) rated value. A lower limit 53b of the battery charge / discharge command value 53 is set to a negative value of the PCS rated value. The PCS rated value is a rated value when the power stored in the power storage device 2 is converted into power that can be used by the customer facility 4 (see FIG. 1).

[0067] Moreover, the calculation block diagram CB2 can be expressed by the following formula (2).

number

[0068] As shown in the calculation block diagram CB3 of FIG. 10, the control unit 33 (see FIG. 2) acquires the storage battery discharge command value 50 based on the acquired value of the power consumption 40, the acquired value of the output power 41, and the contracted power 44. Specifically, the control unit 33 calculates the storage battery discharge command value 50 by subtracting the acquired value of the output power 41 and the value of the contracted power 44 from the acquired value of the power consumption 40. For example, if the acquired value of the power consumption 40 is "1000 kW", the acquired value of the output power 41 is "100 kW", and the contracted power 44 is "800 kW", the storage battery discharge command value 50 is "100 kW". Note that the upper limit 50a of the storage battery discharge command value 50 is the PCS rated value. Also, the lower limit 50b of the storage battery discharge command value 50 is 0 kW.

[0069] Moreover, the calculation block diagram CB3 can be expressed by the following formula (3).

number

[0070] As shown in the calculation block diagram CB4 in FIG. 11, the control unit 33 (see FIG. 2) acquires the storage battery charging command value 51 based on the acquired value of the power consumption 40, the acquired value of the output power 41, and the margin 47. Specifically, the control unit 33 calculates the storage battery charging command value 51 by subtracting the acquired value of the output power 41 from the acquired value of the power consumption 40 and adding the margin 47. For example, if the acquired value of the power consumption 40 is "400 kW", the acquired value of the output power 41 is "500 kW", and the margin 47 is "-10 kW", the storage battery charging command value 51 is "-110 kW". The upper limit 51a of the storage battery charging command value 51 is 0 kW. The lower limit 51b of the storage battery charging command value 51 is a negative value of the PCS rated value. The value of the margin 47 is a value for preventing the connection point power from exceeding the contract power 44 (see FIG. 2). The margin 47 is set in advance and stored in the storage unit 34 (see FIG. 2).

[0071] The calculation block diagram CB4 can be expressed by the following equation (4).

number

[0072] 12, the control unit 33 (see FIG. 2) acquires the storage battery SOC correction value 52 based on the target charge amount index value 43, the current charge amount index value 45, and the correction time 54. Specifically, the control unit 33 subtracts the target charge amount index value 43 from the current charge amount index value 45. Then, the control unit 33 calculates the storage battery SOC correction value 52 by dividing the value obtained by subtracting the target charge amount index value 43 from the current charge amount index value 45 by the correction time 54.

[0073] The battery SOC correction value 52 is a command value obtained by subtracting the target charge amount index value 43 from the current charge amount index value 45 and dividing the result by a correction time 54. In other words, the control unit 33 is configured to correct the charge / discharge output of the power storage device 2 so that the current charge amount index value 45, which is an index value of the current charge amount of the power storage device 2, approaches the target charge amount index value 43.

[0074] In this embodiment, the current charge amount index value 45 is acquired by the control unit 33 (see FIG. 2). Specifically, the control unit 33 acquires the current charge amount index value 45 of the power storage device 2 based on information about the power storage device 2 (see FIG. 1) acquired by the charge amount information acquisition unit 32 (see FIG. 2). More specifically, the control unit 33 acquires the current charge amount of the power storage device 2 from information such as the current value and voltage value of the power storage device 2. Then, the control unit 33 acquires the current charge amount index value 45 from the current charge amount of the power storage device 2 and the maximum charge amount of the power storage device 2.

[0075] The upper limit of battery SOC correction value 52 is upper limit correction value upper limit command value 55. The lower limit of battery SOC correction value 52 is lower limit correction value command value 56.

[0076] The calculation block diagram CB5 can be expressed by the following formula (5).

number

[0077] As shown in the calculation block diagram CB6 of FIG. 13, the control unit 33 (see FIG. 2) obtains the correction value upper limit command value 55 by subtracting the acquired value of the output power 41 from the acquired value of the power consumption 40. The upper limit 55a of the correction value upper limit command value 55 is the PCS rated value. When the storage battery charge / discharge command value 53 is a discharge side (positive) value, the lower limit 55b of the correction value upper limit command value 55 is set so that the storage battery SOC correction value 52 (see FIG. 12) does not become a charge side value. That is, the lower limit 55b of the correction value upper limit command value 55 is set to 0 kW. For example, when the acquired value of the power consumption 40 is "800 kW" and the acquired value of the output power 41 is "900 kW", the value obtained by subtracting the acquired value of the output power 41 from the acquired value of the power consumption 40 is "-100 kW". However, since the lower limit value of the correction value upper limit command value 55 is "0 kW", the value of the correction value upper limit command value 55 is "0 kW".

[0078] The calculation block diagram CB6 can be expressed by the following equation (6).

number

[0079] As shown in the calculation block diagram CB7 in FIG. 14, the control unit 33 (see FIG. 2) acquires the correction value lower limit command value 56 by subtracting the value obtained by adding the acquired value of the output power 41 and the value of the contracted power 44 from the acquired value of the power consumption 40. The lower limit 56b of the correction value lower limit command value 56 is a negative value of the PCS rated value. In addition, when the storage battery charge / discharge command value 53 is a charging side (negative) value, the upper limit 56a of the correction value lower limit command value 56 is set so that the storage battery SOC correction value 52 (see FIG. 12) does not become a discharging side value. That is, the upper limit 56a of the correction value lower limit command value 56 is set to 0 kW. For example, when the acquired value of the power consumption 40 is "1000 kW", the acquired value of the output power 41 is "100 kW", and the value of the contracted power 44 is "800 kW", the value obtained by subtracting the value obtained by adding the acquired value of the output power 41 and the value of the contracted power 44 from the acquired value of the power consumption 40 is "100 kW". However, since the upper limit value of the correction value lower limit command value 56 is "0 kW", the value of the correction value lower limit command value 56 becomes "0 kW".

[0080] The calculation block diagram CB7 can be expressed by the following equation (7).

number

[0081] (Control process of power storage device) Next, a process in which the control unit 33 (see FIG. 2) controls the power of the power storage device 2 (see FIG. 1) will be described with reference to FIG.

[0082] In step S1, the power consumption value acquiring unit 30 (see FIG. 2) acquires a predicted value or a measured value of the power consumption 40 (see FIG. 2) of the consumer equipment 4 (see FIG. 1) that consumes power. In this embodiment, the power consumption value acquiring unit 30 acquires the measured value of the power consumption 40.

[0083] In step S2, the output power value acquisition unit 31 (see FIG. 2) acquires an output prediction value or a measured value of the output power 41 (see FIG. 2) of the power generating facility 1 (see FIG. 1) that generates power. In this embodiment, the output power value acquisition unit 31 acquires the measured value of the output power 41.

[0084] In step S3, the control unit 33 acquires the adjustment value 42 (see FIG. 2). Specifically, the control unit 33 acquires the adjustment value 42 stored in the storage unit 34 (see FIG. 2).

[0085] In step S4, the control unit 33 controls the power of the power generation facility 1 and the power charged and discharged by the power storage device 2 that can charge and discharge power so that the power value of the customer facility 4 (see FIG. 1) does not exceed the target power value 46 (see FIG. 2), and also controls the power of the power generation facility 1 and the power charged and discharged by the power storage device 2 so as to prevent a reverse power flow in which power flows from at least one of the power generation facility 1 and the power storage device 2 to the power system 200. Then, the process ends.

[0086] In this embodiment, the control unit 33 is configured to execute the process of steps S1 to S4 at predetermined time intervals. For example, the control unit 33 is configured to execute the process of steps S1 to S4 at every second. When the control unit 33 controls the charging and discharging of the power storage device 2 by changing the target charging amount index value 43, the charging amount of the power storage device 2 does not change in a short time. In this embodiment, the control unit 33 is configured to control the charging amount of the power storage device 2 at a relatively long time interval so that it is possible to simultaneously suppress the occurrence of reverse power flow and perform peak cutting of the power consumption 40 of the customer facility 4.

[0087] (Control process of charging and discharging power storage device) Next, a process in which the control unit 33 (see FIG. 2) controls charging and discharging of the power storage device 2 (see FIG. 1) will be described with reference to Fig. 16. The process shown in Fig. 16 is a detailed process of the process of step S4 shown in Fig. 15.

[0088] In step S40, the control unit 33 acquires a correction value upper limit command value 55 as shown in FIG.

[0089] In step S41, the control unit 33 acquires the correction value lower limit command value 56 as shown in FIG.

[0090] In step S42, the control unit 33 acquires a target charge amount index value 43 as shown in Fig. 8. That is, in this embodiment, in step S4 of controlling the power of the power generation facility 1 (see Fig. 1) and the power charged and discharged by the power storage device 2, the control unit 33 acquires the target charge amount index value 43, which is an index value of a target charge amount of the power storage device 2, based on the acquired value of the power consumption 40 of the customer facility 4 (see Fig. 1) and the acquired value of the output power 41 of the power generation facility 1.

[0091] In step S43, the control unit 33 acquires the current charge amount index value 45 (see FIG. 2).

[0092] In step S44, the control unit 33 acquires the battery SOC correction value 52 as shown in FIG.

[0093] In step S45, the control unit 33 acquires the battery discharge command value 50 as shown in FIG.

[0094] In step S46, the control unit 33 acquires a storage battery charging command value 51 as shown in FIG.

[0095] In step S47, the control unit 33 acquires the battery charge / discharge command value 53 as shown in FIG.

[0096] In step S48, the control unit 33 controls the charging and discharging of the power storage device 2 based on the storage battery charging and discharging command value 53. After that, the process ends.

[0097] It should be noted that either the process of step S40 or the process of step S41 may be performed first, and either the process of step S45 or the process of step S46 may be performed first.

[0098] [Effects of this embodiment] In this embodiment, the following effects can be obtained.

[0099] In this embodiment, as described above, the power control device 3 is a power control device that controls the power of the consumer equipment 4 including the power generation equipment 1 that generates power and the power storage device 2 that can charge and discharge power, and includes a power consumption value acquisition unit 30 that acquires a predicted value or a measured value of the power consumption 40 of the consumer equipment 4, an output power value acquisition unit 31 that acquires a predicted value or a measured value of the output power 41 of the power generation equipment 1, and controls the power from the power generation equipment 1 and the power charged and discharged by the power storage device 2 so that the power value of the consumer equipment 4 does not exceed the target power value 46, and a control unit 33 that controls the power from the power generation equipment 1 and the charging and discharging power of the power storage device 2 so as to prevent a reverse power flow in which power flows from at least one of the power generation equipment 1 and the power storage device 2 to the power grid 200. The control unit 33 is configured to acquire a target charge amount index value 43, which is an index value of the target charge amount of the power storage device 2, based on the acquired value of the power consumption 40 of the consumer equipment 4 acquired by the power consumption value acquisition unit 30 and the acquired value of the output power 41 of the power generation equipment 1 acquired by the output power value acquisition unit 31.

[0100] Here, in order to prevent the power value of the consumer facility 4 from exceeding the target power value 46, the excess from the target power value 46 may be supplied from the power storage device 2. Also, in order to prevent a reverse power flow, in which power flows from at least one of the power generation facility 1 and the power storage device 2 to the power system 200, the surplus power may be stored in the power storage device 2. Therefore, in order to prevent the power value of the consumer facility 4 from exceeding the target power value 46 and to prevent a reverse power flow from occurring, the charge amount of the power storage device 2 may be adjusted so that the excess or shortage of power can be covered by the charging and discharging of the power storage device 2. Therefore, by configuring as described above, it is possible to control the charge and discharge amount of the power storage device 2 based on the target charge amount index value 43 such that the power value of the consumer facility 4 does not exceed the target power value 46 and a reverse power flow does not occur, and therefore it is possible to suppress a shortage and an excess of the charge amount of the power storage device 2. As a result, it is possible to avoid penalties such as paying a surcharge to the power system 200, while simultaneously preventing the power value of the consumer equipment 4 from exceeding the target value, and preventing the occurrence of reverse power flow in which power flows from at least one of the power generation equipment 1 and the power storage device 2 to the power system 200.

[0101] In this embodiment, as described above, the control unit 33 is configured to correct the charge / discharge output of the power storage device 2 so that the current charge amount index value 45, which is an index value of the current charge amount of the power storage device 2, approaches the target charge amount index value 43. As a result, the charge amount of the power storage device 2 is controlled so that the current charge amount of the power storage device 2 becomes the charge amount of the target charge amount index value 43, so that the charge amount of the power storage device 2 can be controlled to a charge amount that can cover the excess or shortage of power so that the power value of the consumer facility 4 does not exceed the target power value 46 and reverse power flow does not occur. As a result, it is possible to easily prevent the power value of the consumer facility 4 from exceeding the target power value 46 and the occurrence of reverse power flow.

[0102] In the present embodiment, as described above, the control unit 33 is configured to change the target charge amount index value 43 based on the relationship between the magnitude of the acquired value of the output power 41 of the power generation facility 1 and the magnitude of the acquired value of the power consumption 40 of the consumer facility 4. As a result, the target charge amount index value 43 is changed based on the relationship between the magnitude of the acquired value of the output power 41 of the power generation facility 1 and the magnitude of the acquired value of the power consumption 40 of the consumer facility 4, so that the target charge amount index value 43 can be changed according to the magnitude of the actually acquired output power 41 of the power generation facility 1 and the magnitude of the power consumption 40 of the consumer facility 4. Therefore, compared to a configuration in which the charge amount of the power storage device 2 is adjusted in advance based on the predicted value of the output power 41 of the power generation facility 1 and the predicted value of the power consumption 40 of the consumer facility 4 set on the previous day, for example, the target charge amount index value 43 can be adjusted with precision, so that the charge amount of the power storage device 2 can be accurately adjusted to a value that can suppress the power value of the consumer facility 4 from exceeding the target power value 46 and the occurrence of reverse power flow. As a result, it is possible to further prevent the power value of the customer facility 4 from exceeding the target power value 46 and to further prevent reverse power flow from occurring.

[0103] In this embodiment, as described above, the control unit 33 is configured to determine whether reverse power flow will occur and whether peak power cutting is necessary based on the relationship between the magnitude of the acquired value of the output power 41 of the power generation facility 1 and the magnitude of the acquired value of the power consumption 40 of the consumer facility 4, and to control the target charge amount index value 43 to be changed to a smaller value when there is a possibility of reverse power flow occurring, and to control the target charge amount index value 43 to be changed to a larger value when peak power cutting is necessary. As a result, when there is a possibility of reverse power flow occurring, the target charge amount index value 43 is changed to a smaller value, so that the charge amount of the power storage device 2 can be controlled so that the charge amount of the power storage device 2 is reduced. Therefore, even if surplus power is output by the power generation facility 1, it is possible to increase the capacity of power that can be stored in the power storage device 2 (chargeable capacity), so that the occurrence of reverse power flow can be easily suppressed. Furthermore, when peak power cutting is necessary, the target charge amount index value 43 is changed to a larger value, so that the amount of power required for peak power cutting can be stored in the power storage device 2. Therefore, when peak power shaving is required, it is possible to supply power from the power storage device 2 to the load, and thus peak power shaving can be easily performed. As a result, it is possible to easily achieve both suppression of reverse power flow and peak power shaving.

[0104] In this embodiment, as described above, the control unit 33 is configured to acquire the target charge amount index value 43 based on the adjustment value 42 for adjusting the degree of influence of the acquired value of the output power 41 of the power generation facility 1, the acquired value of the output power 41 of the power generation facility 1, and the acquired value of the power consumption 40 of the consumer facility 4. Here, the power consumption 40 of the consumer facility 4 rarely changes significantly from the power consumption 40 predicted in advance. On the other hand, for example, when the power generation facility 1 is a power generation facility 1 that uses renewable energy such as a solar power generation facility, the output power 41 output from the power generation facility 1 fluctuates greatly depending on the weather. Therefore, by configuring as described above, it is possible to adjust the degree of influence of the output power 41 of the power generation facility 1, which has a large fluctuation in the output power 41, and therefore the target charge amount index value 43 can be accurately adjusted to a value suitable for suppressing reverse power flow and cutting peak power.

[0105] In this embodiment, as described above, the control unit 33 is configured to obtain an adjusted output value, which is an adjusted output value of the power generation facility 1, by dividing the obtained value of the output power 41 of the power generation facility 1 by the adjustment value 42, and to calculate a target charge amount index value 43 based on the adjusted output value and the obtained value of the power consumption 40 of the customer facility 4. This makes it possible to easily obtain a target charge amount index value 43 that can accurately achieve both suppression of reverse power flow and peak power shaving.

[0106] Furthermore, in this embodiment, as described above, the power control system 100 includes the power generation equipment 1 that generates power, the power storage device 2 that can charge and discharge the power, a power consumption value acquisition unit 30 that acquires a predicted value or a measured value of the power consumption 40 of the consumer equipment 4 that consumes the power, an output power value acquisition unit 31 that acquires an output predicted value or a measured value of the output power 41 of the power generation equipment 1, and a control unit 33 that controls the power of the power generation equipment 1 and the power charged and discharged by the power storage device 2 so that the power value of the consumer equipment 4 does not exceed the target power value 46, and controls the power from the power generation equipment 1 and the power charged and discharged by the power storage device 2 so that a reverse power flow in which power flows from at least one of the power generation equipment 1 and the power storage device 2 to the power system 200 is not generated, and the control unit 33 is configured to acquire a target charge amount index value 43 that is an index value of the target charge amount of the power storage device 2, based on the acquired value of the power consumption 40 of the consumer equipment 4 acquired by the power consumption value acquisition unit 30 and the acquired value of the output power 41 of the power generation equipment 1 acquired by the output power value acquisition unit 31. As a result, similarly to the power control device 3 according to the above embodiment, it is possible to provide a power control system 100 that can simultaneously prevent the power value of the consumer equipment 4 from exceeding the target value and prevent reverse power flow, while avoiding penalties such as paying a surcharge to the power grid 200.

[0107] In this embodiment, as described above, the power generation facility 1 is a renewable energy power generation facility that utilizes renewable energy, the output power value acquisition unit 31 is configured to acquire an output prediction value or a measured value of the output power 41 of the renewable energy power generation facility, and the control unit 33 is configured to calculate a target charge amount index value 43 based on the acquired value of the output power 41 of the renewable energy power generation facility and the acquired value of the power consumption 40 of the consumer facility 4. As a result, in the power control system 100 equipped with a renewable energy power generation facility with large fluctuations in the output power 41, it is possible to simultaneously suppress the power value of the consumer facility 4 from exceeding the target value and prevent the occurrence of a reverse power flow in which power flows from at least one of the power generation facility 1 and the power storage device 2 to the power system 200.

[0108] Furthermore, in this embodiment, as described above, the power control method includes the steps of acquiring a predicted value or measured value of the power consumption 40 of the consumer equipment 4 that consumes power, acquiring an output predicted value or measured value of the output power 41 of the power generation equipment 1 that generates power, and controlling the power of the power generation equipment 1 and the power charged and discharged by the power storage device 2 that can charge and discharge power so that the power value of the consumer equipment 4 does not exceed the target power value 46, and controlling the power of the power generation equipment 1 and the power charged and discharged by the power storage device 2 so that a reverse power flow in which power flows from at least one of the power generation equipment 1 and the power storage device 2 to the power system 200 does not occur. In the step of controlling the power of the power generation equipment 1 and the power charged and discharged by the power storage device 2, a target charge amount index value 43, which is an index value of the target charge amount of the power storage device 2, is acquired based on the acquired value of the power consumption 40 of the consumer equipment 4 and the acquired value of the output power 41 of the power generation equipment 1. As a result, similarly to the power control device 3 according to the above embodiment, it is possible to provide a power control method that can simultaneously prevent the power value of the consumer equipment 4 from exceeding a target value and prevent reverse power flow, while avoiding penalties such as paying a surcharge to the power system 200.

[0109] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications (variations) within the meaning and scope of the claims.

[0110] In the above embodiment, an example of a configuration in which the control unit 33 corrects the charging and discharging power of the power storage device 2 so that the current charging amount index value 45 of the power storage device 2 approaches the target charging amount index value 43 has been described, but the present invention is not limited to this. For example, as long as it is possible to simultaneously suppress reverse power flow and cut peak power demand, the control unit 33 may correct the charging and discharging of the power storage device 2 in any way.

[0111] In the above embodiment, an example of a configuration in which the control unit 33 changes the target charge amount index value 43 based on the relationship between the magnitude of the acquired value of the output power 41 and the magnitude of the acquired value of the power consumption 40 has been described, but the present invention is not limited to this. For example, the control unit may be configured to change the target charge amount index value 43 by comparing the magnitude of the acquired value of the output power 41 and the magnitude of the acquired value of the power consumption 40 with threshold values.

[0112] In the above embodiment, an example of a configuration in which the control unit 33 determines whether reverse power flow will occur and whether peak power cutting is necessary based on the relationship between the magnitude of the acquired value of the output power 41 and the magnitude of the acquired value of the power consumption 40 has been shown, but the present invention is not limited to this. For example, the control unit may be configured to determine whether reverse power flow will occur and whether peak power cutting is necessary by comparing the magnitude of the acquired value of the output power 41 and the magnitude of the acquired value of the power consumption 40 with threshold values. As long as it is possible to determine whether reverse power flow will occur and whether peak power cutting is necessary, it does not matter how the control unit makes the determination.

[0113] In the above embodiment, the control unit 33 acquires the target charge amount index value 43 based on the adjustment value 42, the acquired value of the output power 41, and the acquired value of the power consumption 40. However, the present invention is not limited to this. For example, the control unit may be configured to acquire the target charge amount index value 43 based on the acquired value of the output power 41 and the acquired value of the power consumption 40 without using the adjustment value 42. However, in the case where the control unit acquires the target charge amount index value 43 based on the acquired value of the output power 41 and the acquired value of the power consumption 40 without using the adjustment value 42, it becomes difficult to change the target charge amount index value 43 with high accuracy in the power generation equipment 1 in which the output power 41 is likely to fluctuate. Therefore, it is preferable that the control unit 33 acquires the target charge amount index value 43 based on the adjustment value 42, the acquired value of the output power 41, and the acquired value of the power consumption 40.

[0114] In the above embodiment, the customer facility 4 is an electric power consumption facility provided in a factory, but the present invention is not limited to this. For example, the customer facility may further include a hydrogen production device that produces hydrogen using electric power generated by the power generation facility 1, or an ice making device that produces ice using electric power generated by the power generation facility 1. With this configuration, even if the acquired value of the power consumption 40 by the electric power consumption facility is low, the current charge amount of the power storage device 2 is high, and the acquired value of the output power 41 is high, the occurrence of reverse power flow can be further suppressed by discharging electric power to the hydrogen production device or the production device.

[0115] In addition, in the present embodiment, an example of a configuration in which the power generation facility 1 is a solar power generation facility that uses solar light as renewable energy has been described, but the present invention is not limited to this. For example, the power generation facility 1 may be a wind power generation facility that uses wind power as renewable energy, a hydroelectric power generation facility that uses hydroelectric power, or a geothermal power generation facility that uses geothermal energy.

[0116] In the present embodiment, the power generation facility 1 is a renewable energy power generation facility that uses renewable energy, but the present invention is not limited to this. For example, the power generation facility 1 may be a power generation facility that does not use renewable energy.

[0117] In addition, in the above embodiment, an example of a configuration in which the power consumption value acquiring unit 30 acquires a measured value of the power consumption 40 of the consumer facility 4 has been described, but the present invention is not limited to this. For example, the power consumption value acquiring unit 30 may be configured to acquire a predicted value of the power consumption 40 of the consumer facility 4. In this case, taking into consideration the accuracy of adjusting the target charge amount index value 43, it is preferable that the power consumption value acquiring unit 30 is configured to acquire a predicted value of the power consumption 40 for a relatively short period of time.

[0118] In the above embodiment, an example of a configuration in which the output power value acquisition unit 31 acquires a measured value of the output power 41 of the power generation facility 1 has been described, but the present invention is not limited to this. For example, the output power value acquisition unit 31 may be configured to acquire a predicted value of the output power 41 of the power generation facility 1. In this case, in consideration of the accuracy of adjusting the target charge amount index value 43, it is preferable that the output power value acquisition unit 31 is configured to acquire a predicted value of the output power 41 for a relatively short period of time.

[0119] In the above embodiment, for convenience of explanation, the process of power control of the power storage device 2 by the control unit 33 and the process of controlling charging and discharging of the power storage device 2 are explained using a flow-driven flowchart in which the process is performed in order according to a processing flow, but the present invention is not limited to this. In the present invention, the processing operation by the control unit 33 may be performed by event-driven processing in which processing is performed on an event-by-event basis. In this case, the process may be completely event-driven, or may be a combination of event-driven and flow-driven. [Explanation of symbols]

[0120] 1. Power generation facilities 2. Power storage device 3. Power Control Device 4 Consumer equipment 30 Power consumption value acquisition unit 31 Output power value acquisition unit 33 Control Unit 40 Power consumption 41 Output power 42 Adjustment value 43 Target charge amount index value 45 Current charge level index value 46 Target power value 100 Power Control System 200 Power system

Claims

1. A power control device that controls power of a consumer facility including a power generation facility that generates power and a power storage device that can charge and discharge power, a power consumption value acquisition unit that acquires a predicted value or a measured value of power consumption of the consumer equipment; an output power value acquisition unit that acquires an output predicted value or a measured value of the output power of the power generation facility; a control unit that controls the power from the power generation facility and the power charged and discharged by the power storage device so that the power value of the consumer facility does not exceed a target power value, and controls the power from the power generation facility and the power charged and discharged by the power storage device so as to prevent a reverse power flow in which power flows from at least one of the power generation facility and the power storage device to a power grid, The control unit is The power control device is configured to acquire a target charge amount index value, which is an index value of a target charge amount of the power storage device, based on the acquired value of the power consumption of the consumer equipment acquired by the power consumption value acquisition unit and the acquired value of the output power of the power generation equipment acquired by the output power value acquisition unit.

2. The power control device according to claim 1, wherein the control unit is configured to correct the charge / discharge output of the power storage device so that a current charge amount index value, which is an index value of a current charge amount of the power storage device, approaches the target charge amount index value.

3. 3. The power control device according to claim 2, wherein the control unit is configured to change the target charge amount index value based on a relationship between a magnitude of an acquired value of the output power of the power generation equipment and a magnitude of an acquired value of the power consumption of the consumer equipment.

4. 4. The power control device according to claim 3, wherein the control unit is configured to determine whether reverse power flow will occur and whether peak power cutting is necessary based on a relationship between the magnitude of the acquired value of the output power of the power generation equipment and the magnitude of the acquired value of the power consumption of the consumer equipment, and to control the target charge amount index value to be changed to a smaller value when there is a possibility of reverse power flow occurring, and to control the target charge amount index value to be changed to a larger value when peak power cutting is necessary.

5. The power control device according to claim 4, wherein the control unit is configured to acquire the target charge amount index value based on an adjustment value that adjusts the degree of influence of the acquired value of the output power of the power generation equipment, the acquired value of the output power of the power generation equipment, and the acquired value of the power consumption of the consumer equipment.

6. The power control device according to claim 5, wherein the control unit is configured to obtain an adjusted output value, which is an adjusted output value of the power generation equipment, by dividing an acquired value of the output power of the power generation equipment by the adjustment value, and to calculate the target charging amount index value based on the adjusted output value and the acquired value of the power consumption of the consumer equipment.

7. A power generation facility that generates electricity; A power storage device capable of charging and discharging power; a power consumption value acquisition unit that acquires a predicted value or a measured value of power consumption of a consumer facility that consumes power; an output power value acquisition unit that acquires an output predicted value or a measured value of the output power of the power generation facility; a control unit that controls the power of the power generation facility and the power charged and discharged by the power storage device so that the power value of the consumer facility does not exceed a target power value, and controls the power from the power generation facility and the power charged and discharged by the power storage device so that a reverse power flow in which power flows from at least one of the power generation facility and the power storage device to a power grid does not occur, The control unit is The power control system is configured to acquire a target charge amount index value, which is an index value of a target charge amount of the power storage device, based on the acquired value of the power consumption of the consumer equipment acquired by the power consumption value acquisition unit and the acquired value of the output power of the power generation equipment acquired by the output power value acquisition unit.

8. The power generation facility is a renewable energy power generation facility that utilizes renewable energy, The output power value acquisition unit is configured to acquire an output predicted value or a measured value of the output power of the renewable energy power generation facility, The power control system according to claim 7 , wherein the control unit is configured to calculate the target charge amount index value based on an acquired value of the output power of the renewable energy power generation facility and an acquired value of the power consumption of the consumer facility.

9. Obtaining a predicted or measured value of power consumption of a customer facility that consumes power; Obtaining a predicted or measured output value of an output power of a power generation facility that generates power; controlling the power of the power generation facility and the power charged and discharged by a power storage device capable of charging and discharging power so that the power value of the consumer facility does not exceed a target power value, and controlling the power of the power generation facility and the power charged and discharged by the power storage device so that a reverse power flow in which power flows from at least one of the power generation facility and the power storage device to a power grid does not occur; A power control method, in a step of controlling the power of the power generation equipment and the power charged and discharged by the power storage device, acquiring a target charge amount index value, which is an index value of a target charge amount of the power storage device, based on an acquired value of the power consumption of the consumer equipment and an acquired value of the output power of the power generation equipment.

Images