Control system and power system

Abstract

To effectively use generated power of power generation facilities in a power generation system from which power is fed to a combination point by using the power generation facilities and a power storage facility.SOLUTION: A control system 30 controls a power generation system 20 from which power is fed to a combination point 11 by a first power generation facility 21 that can generate the power by using renewable energy, a second power generation facility 22 that can generate the power by using the renewable energy, and a power storage facility 23 capable of charging / discharging the power. The system sets an upper limit value Z of generated power by the second power generation facility 22 in such a manner that total power fed to the combination point 11 by the first power generation facility 21, the second power generation facility 22, and the power storage facility 23 according to an output limit value L at the combination point 11, a power value P1 of generated power by the first power generation facility 21, and an operation limit value C at the power storage facility 23 does not exceeds the output limit value L.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a technique for controlling power [Background technology]

[0002] BACKGROUND ART Various techniques have been proposed for supplying power to a combining point (for example, an interconnection point) of a power system by utilizing renewable energy such as solar energy or wind energy (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6105138 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to supply power to a combining point, a power storage facility is used in addition to a power generation facility. In a system that supplies power to a combining point using a power storage facility in addition to a power generation facility, it is required to supply sufficient power within a power limit value range at the combining point. In consideration of the above circumstances, one aspect of the present disclosure aims to effectively utilize the power generated by the power generation facility in a power system that supplies power to a combining point using a power generation facility and a power storage facility. [Means for solving the problem]

[0005] In order to solve the above problems, a control system according to one embodiment of the present disclosure is a system for controlling a power generation system that supplies power to a combining point using a first power generation facility capable of generating power using renewable energy, a second power generation facility capable of generating power using renewable energy, and a storage facility that can charge and discharge power, and includes a setting processing unit that sets an upper limit value for the power generated by the second power generation facility based on an output limit value at the combining point, a power value of the power generated by the first power generation facility, and an operating limit value of the storage facility, so that the total power supplied to the combining point by the first power generation facility, the second power generation facility, and the storage facility does not exceed the output limit value.

[0006] A power system according to one embodiment of the present disclosure is a power system that supplies power to a combining point, and includes a first power generation facility capable of generating power using renewable energy, a second power generation facility capable of generating power using renewable energy, a storage facility capable of charging and discharging power, and a control system that sets an upper limit value for the power generated by the second power generation facility based on an output limit value at the combining point, a power value of the power generated by the first power generation facility, and an operating limit value of the storage facility, so that the total power supplied to the combining point by the first power generation facility, the second power generation facility, and the storage facility does not exceed the output limit value. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a block diagram illustrating a configuration of a power system according to an embodiment. [Figure 2] FIG. 1 is a block diagram illustrating a configuration of a control system. [Figure 3] FIG. 2 is a block diagram illustrating an example of the functional configuration of the control system. [Figure 4] FIG. 2 is an explanatory diagram regarding the function of an operation control unit. [Figure 5] FIG. 2 is an explanatory diagram relating to the function of a setting processing unit. [Figure 6] 10 is a graph showing the relationship between a first power value, a second power value, and an operational limit value. [Figure 7]FIG. 4 is an explanatory diagram relating to the relationship between an output limit value and a power generation upper limit value. [Figure 8] This is a specific example of a situation in which the power generation upper limit value changes. [Figure 9] 10 is a flowchart illustrating a specific procedure of a control process. [Figure 10] FIG. 10 is a diagram illustrating the effect of the embodiment. [Figure 11] FIG. 10 is a diagram illustrating the effect of the embodiment. [Figure 12] FIG. 10 is an explanatory diagram regarding functions of an operation control unit in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The following description of an embodiment of the present disclosure will be given with reference to the accompanying drawings. Note that the embodiment described below is an exemplary embodiment that may be envisioned when implementing the present disclosure. Therefore, the scope of the present disclosure is not limited to the embodiment exemplified below.

[0009] A: Embodiment 1 is a block diagram illustrating the configuration of a power system 100 according to an embodiment of the present disclosure. The power system 100 is a system that transfers electric power (AC power) to and from a power grid 10. The power grid 10 is, for example, a distribution system or a transmission system that supplies electric power generated by a power generation facility (not shown) such as a thermal power plant or a nuclear power plant to consumers such as business facilities or ordinary homes.

[0010] As illustrated in Fig. 1, the power system 100 includes a power generation system 20 and a control system 30. The power generation system 20 is a facility that supplies power to the power grid 10, and is connected to the power grid 10 at an interconnection point 11. In reality, power equipment such as a transformer is installed between the power system 100 and the interconnection point 11, but is omitted from Fig. 1 for convenience. The control system 30 is a computer system that controls the supply of power by the power generation system 20. The control system 30 can communicate with the power generation system 20 via a communication network (not shown), such as a dedicated line.

[0011] As illustrated in FIG. 1, the power system 100 includes a first power generation facility 21, a second power generation facility 22, and a power storage facility 23. The first power generation facility 21 and the second power generation facility 22 are power generation facilities capable of generating power using renewable energy. Specifically, the first power generation facility 21 and the second power generation facility 22 are solar power generation systems that generate power by converting solar energy. For example, each of the first power generation facility 21 and the second power generation facility 22 is configured with solar panels that convert solar energy into power and a control device (PCS: Power Conditioning System) that controls the power generation by the solar panels. Note that each of the first power generation facility 21 and the second power generation facility 22 may be configured as a single facility or may be configured as multiple facilities installed in different locations.

[0012] The power storage facility 23 is a power facility capable of charging and discharging power. Specifically, the power storage facility 23 is a system storage battery capable of charging the power generated by the second power generation facility 22 and discharging the charged power. For example, the power storage facility 23 is composed of a storage battery capable of charging and discharging, and a control device (PCS) that controls the charging and discharging of the storage battery. The power storage facility 23 may be composed of a single facility, or may be composed of multiple facilities installed in different locations.

[0013] The second power generation facility 22 and the power storage facility 23 are facilities that were added after the first power generation facility 21 was installed. For example, the manager of the first power generation facility 21 is separate from the manager of the second power generation facility 22 and the power storage facility 23. In the above situation, there are cases where the supply of power by the first power generation facility 21 should be given priority over the supply of power by the second power generation facility 22 and the power storage facility 23.

[0014] Fig. 2 is a block diagram illustrating an example of the configuration of the control system 30. As illustrated in Fig. 2, the control system 30 includes a control device 31, a storage device 32, and a communication device 33. The control system 30 may be realized by a single device, or may be realized by multiple devices configured separately from each other.

[0015] The control device 31 is composed of one or more processors that control each element of the control system 30. Specifically, the control device 31 is composed of one or more types of processors, such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), or an ASIC (Application Specific Integrated Circuit).

[0016] The storage device 32 is one or more memories that store programs executed by the control device 31 and data used by the control device 31. The storage device 32 is configured with a known storage medium such as a magnetic storage medium or a semiconductor storage medium. The storage device 32 may be configured with a combination of multiple types of storage medium. A portable storage medium that can be attached to and detached from the control system 30 may be used as the storage device 32.

[0017] The communication device 33 communicates with an external device via wire or wirelessly. Specifically, the communication device 33 communicates with the power generation system 20 (the first power generation facility 21, the second power generation facility 22, and the power storage facility 23).

[0018] 3 is a block diagram illustrating an example of the functional configuration of the control system 30. The control device 31 executes a program stored in the storage device 32 to realize a plurality of functions (an information acquisition unit 41, an operation control unit 42, and a setting processing unit 43) for controlling the power generation system 20.

[0019] The information acquisition unit 41 acquires various types of information from external devices such as the power generation system 20. Specifically, the information acquisition unit 41 receives various types of information using, for example, the communication device 33. The information acquisition unit 41 of this embodiment acquires the output limit value L, the first power value P1, the second power value P2, and the operation limit value C.

[0020] The output limit value L is an upper limit value of power at the interconnection point 11. The output limit value L is a limit value set in accordance with regulations related to the power system 10, for example, depending on the circumstances such as the power capacity of the power system 10. The information acquisition unit 41 acquires the output limit value L from an external device such as an energy management system (EMS). The output limit value L is a variable value that can be changed at any time by the management system.

[0021] The first power value P1 is the power value of the power actually generated by the first power generation facility 21. The information acquisition unit 41 acquires the first power value P1 from the first power generation facility 21. Similarly, the second power value P2 is the power value of the power actually generated by the second power generation facility 22. The information acquisition unit 41 acquires the second power value P2 from the second power generation facility 22. The first power value P1 and the second power value P2 vary depending on conditions such as the illuminance of sunlight, for example.

[0022] The operational limit value C is a limit value of the power that can be charged and discharged by the power storage equipment 23. The operational limit value C varies depending on the voltage state of the power storage equipment 23. The operational limit value C can be set to a positive number or a negative number. A positive number for the operational limit value C means the power value that the power storage equipment 23 can discharge. On the other hand, a negative number for the operational limit value C means the power value that the power storage equipment 23 can charge. Therefore, the absolute value |C| of the operational limit value C within the range of negative numbers can also be expressed as the capacity of power that the power storage equipment 23 can charge (hereinafter referred to as "charging capacity"). The information acquisition unit 41 acquires the operational limit value C from the power storage equipment 23.

[0023] The operation control unit 42 in Fig. 3 controls the operation of the power storage equipment 23 in accordance with the information acquired by the information acquisition unit 41. Specifically, the operation control unit 42 generates an operation command X for the power storage equipment 23 in accordance with the output limit value L, the first power value P1, and the second power value P2. The operation command X is a command for charging the power storage equipment 23 and includes a designation of the amount of charge. The operation command X is transmitted from the communication device 33 to the power storage equipment 23. The power storage equipment 23 charges the power generated by the second power generation equipment 22 in accordance with the operation command X.

[0024] 4 is an explanatory diagram regarding the function of the operation control unit 42. As illustrated in FIG. 4, the operation control unit 42 includes a calculation unit 421, a calculation unit 422, and a limiting unit 423.

[0025] The calculation unit 421 calculates the total power P12 by adding the first power value P1 and the second power value P2. The calculation unit 422 calculates the operation command X0 by subtracting the total power P12 from the output limit value L (X0=L-P12). The limiting unit 423 generates the operation command X by limiting the operation command X0 to a range of 0 W or less. A range of 0 or less for the operation command X means charging by the power storage equipment 23. In other words, the operation command X is an instruction to charge the power storage equipment 23.

[0026] The setting processing unit 43 in Fig. 3 sets a power generation upper limit value Z according to the information acquired by the information acquisition unit 41. The power generation upper limit value Z is an upper limit value of the power generated by the second power generation facility 22. Specifically, the setting processing unit 43 sets the power generation upper limit value Z of the second power generation facility 22 according to the output limit value L, the first power value P1, and the operation limit value C so that the total power generated by the power generation system 20 (the first power generation facility 21, the second power generation facility 22, and the power storage facility 23) does not exceed the output limit value L.

[0027] The power generation upper limit value Z is transmitted from the communication device 33 to the second power generation facility 22. The second power generation facility 22 generates power with the power generation upper limit value Z as its upper limit. That is, the second power generation facility 22 generates power without limit when the power generation power is below the power generation upper limit value Z, and when the power generation power may exceed the power generation upper limit value Z, the second power generation facility 22 limits the power generation operation so that the power generation power does not exceed the power generation upper limit value Z.

[0028] 5 is an explanatory diagram regarding the function of the setting processing unit 43. As illustrated in FIG.

[0029] The calculation unit 431 calculates a power difference value D by subtracting the first power value P1 from the output limit value L (D=L-P1). The power difference value D is the shortfall in the power generated by the first power generation facility 21 relative to the output limit value L. In other words, the power difference value D corresponds to the power that can be additionally supplied by the second power generation facility 22 and the power storage facility 23 until the power at the interconnection point 11 reaches the output limit value L (the power that can be shared by the second power generation facility 22 and the power storage facility 23).

[0030] The calculation unit 432 calculates the power generation upper limit value Z of the second power generation facility 22 by subtracting the operation limit value C from the power difference value D (Z=DC). Therefore, when the operation limit value C is a negative number, the power generation upper limit value Z is calculated as the value obtained by adding the power that can be charged by the power storage facility 23 (charging capacity |C|) to the power difference value D. On the other hand, when the operation limit value C is a positive number (i.e., when the power storage facility 23 is discharging), the power generation upper limit value Z is set to a value lower than the power difference value D.

[0031] As can be understood from the above explanation, the power generation upper limit value Z is expressed by the following formula (1). Z=L-P1-C (1) As can be seen from equation (1), the setting processing unit 43 calculates the power generation upper limit value Z of the second power generation facility 22 by subtracting the first power value P1 and the operation limit value C from the output limit value L.

[0032] Fig. 6 is a graph showing the relationship between the first power value P1 generated by the first power generation facility 21 and the power generation upper limit value Z instructed to the second power generation facility 22. Fig. 6 also shows the relationship between the first power value P1 and the power generation upper limit value Z for a plurality of cases where the operation limit value C of the power storage facility 23 is different (C = -1 MW, -0.5 MW, 0 MW). Fig. 6 also assumes a case where the output limit value L is fixed at 2 MW.

[0033] 6, the power generation upper limit value Z monotonically decreases with respect to the first power value P1. The monotonous decrease of the power generation upper limit value Z with respect to the first power value P1 is a monotonous decrease in a broad sense that may include a range in which the power generation upper limit value Z does not fluctuate with fluctuations in the first power value P1.

[0034] Figure 6 shows values ​​p1 and p2 for the first power value P1. Value p2 exceeds value p1. Now, for the sake of convenience, if we focus on the case where the operating limit value C is -0.5 MW, as can be seen from equation (1) and Figure 6, the value Za1 of the power generation upper limit value Z when the first power value P1 is value p1 exceeds the value Za2 of the power generation upper limit value Z when the first power value P1 is value p2.

[0035] 6, the power generation upper limit value Z has a monotonically increasing relationship with the charge capacity |C|. The monotonically increasing power generation upper limit value Z with respect to the charge capacity |C| is a monotonically increasing relationship in a broad sense that may include a range in which the power generation upper limit value Z does not fluctuate with fluctuations in the charge capacity |C|.

[0036] FIG. 6 shows values ​​c1 and c2 for the charging capacity |C|. The value c1 is the absolute value of the operational limit value C minus 0.5 MW (c1=0.5), meaning that the charging capacity |C| is 0.5 MW. On the other hand, the value c2 is the absolute value of the operational limit value C minus 1 MW (c2=1), meaning that the charging capacity |C| is 1 MW. As described above, the value c2 of the charging capacity |C| exceeds the value c1.

[0037] As can be understood from equation (1) and Figure 6, if we focus for convenience on one numerical value of the first power value P1 (for example, numerical value p2), the numerical value Zb1 of the power generation upper limit value Z when the charging capacity |C| is numerical value c1 is lower than the numerical value Zb2 of the power generation upper limit value Z when the charging capacity |C| is numerical value c2.

[0038] 7 is an explanatory diagram regarding the relationship between the output limit value L and the power generation upper limit value Z. As can be understood from equation (1) and FIG. 7, the power generation upper limit value Z has a monotonically increasing relationship with the output limit value L. The monotonically increasing power generation upper limit value Z with respect to the output limit value L is a monotonically increasing in a broad sense that may include a range in which the power generation upper limit value Z does not fluctuate in response to fluctuations in the output limit value L.

[0039] 7 shows values ​​q1 and q2 for the output limit value L. The value q2 is greater than the value q1. As can be seen from FIG. 7, the value Zc1 of the power generation upper limit value Z when the output limit value L is the value q1 is less than the value Zc2 of the power generation upper limit value Z when the output limit value L is the value q2.

[0040] Figure 8 shows a specific example of a situation in which the power generation upper limit value Z changes. Figure 8 shows state A, which corresponds to point A in Figure 6, and state B, which corresponds to point B in Figure 6. The output limit value L in states A and B is 2 MW.

[0041] State A is a state in which the first power value P1 of power generation by the first power generation facility 21 is 1 MW, and the operation limit value C of the power storage facility 23 is −1 MW. That is, the charge capacity |C| of the power storage facility 23 is 1 MW.

[0042] In state A, setting processing unit 43 sets power generation upper limit value Z to 2 MW (= 2 MW - 1 MW + 1 MW). Therefore, when second power generation facility 22 generates 2 MW of power, which corresponds to power generation upper limit value Z, 1 MW of that power is stored in power storage facility 23, and as a result, the power supplied from second power generation facility 22 and power storage facility 23 to interconnection point 11 becomes 1 MW. Since the power supplied from first power generation facility 21 to interconnection point 11 is 1 MW, ultimately, 2 MW of power, which corresponds to output limit value L, is supplied from power system 100 to interconnection point 11.

[0043] In state B, the first power value P1 of the power generation by the first power generation facility 21 is increased to 2 MW from 1 MW in state A. The charging capacity |C| of the power storage facility 23 is maintained at 1 MW, the same as in state A.

[0044] In state B, setting processing unit 43 sets power generation upper limit value Z to 1 MW (=2 MW−2 MW+1 MW). Therefore, when second power generation facility 22 generates 1 MW of power, which corresponds to power generation upper limit value Z, all of that power is stored in power storage facility 23. Therefore, the power supplied from second power generation facility 22 and power storage facility 23 to interconnection point 11 is 0 MW. Since the power supplied from first power generation facility 21 to interconnection point 11 is 2 MW, ultimately, 2 MW of power, which corresponds to output limit value L, is supplied from power system 100 to interconnection point 11.

[0045] As can be understood from the above examples, according to this embodiment, even if the first power value P1 of power generation by the first power generation equipment 21 changes, by effectively utilizing the power generated by the second power generation equipment 22 while utilizing the operating limit value C of the storage equipment 23, power within the range of the output limit value L can be supplied to the interconnection point 11.

[0046] 9 is a flowchart illustrating a specific procedure of a process (hereinafter referred to as "control process") in which the control system 30 controls the second power generation facility 22. For example, the control process is repeated at a predetermined cycle.

[0047] When the control process is started, the control device 31 (information acquisition unit 41) acquires the output limit value L, the first power value P1, and the operation limit value C (S1). The control device 31 (setting processing unit 43) sets the power generation upper limit value Z of the second power generation facility 22 according to the output limit value L, the first power value P1, and the operation limit value C so that the total power generated by the power generation system 20 does not exceed the output limit value L (S2). The control device 31 (setting processing unit 43) instructs the second power generation facility 22 of the power generation upper limit value Z (S3).

[0048] As described above, in this embodiment, the power generation upper limit value Z of power generation by the second power generation facility 22 is set according to the output limit value L at the interconnection point 11, the first power value P1 of power generation by the first power generation facility 21, and the operation limit value C (charge capacity |C|) of the power storage facility 23. Therefore, compared to a configuration (hereinafter referred to as the "comparative example") in which the operation limit value C of the power storage facility 23 is set to the power generation upper limit value Z of the second power generation facility 22, for example, the power generated by the second power generation facility 22 can be used more effectively to supply power to the interconnection point 11.

[0049] 10 and 11 are diagrams illustrating the effects of this embodiment. Fig. 10 illustrates a state in which the output limit value L is 2 MW and the first power value P1 of the power from the existing first power generation facility 21 is 1 MW. Now, assume that the power storage facility 23 has reached full charge, and the charge capacity |C| has decreased to 0 MW.

[0050] In the comparative example, the charge capacity |C| is set as the power generation upper limit Z of the second power generation facility 22. That is, the power generation upper limit Z is set to 0 MW. That is, the power supplied from the second power generation facility 22 and the power storage facility 23 to the interconnection point 11 is 0 MW. Therefore, the power supplied from the power generation system 20 to the interconnection point 11 is 1 MW generated by the first power generation facility 21. As described above, in the comparative example, the power supplied from the power generation system 20 to the interconnection point 11 can be prevented from exceeding the output limit L. However, the power supplied from the power generation system 20 to the interconnection point 11 is 1 MW, which is below the output limit L.

[0051] On the other hand, in this embodiment, the power generation upper limit value Z of the second power generation facility 22 is set to 1 MW (=2 MW-1 MW-0 MW) using the above-mentioned formula (1). Therefore, the power supplied from the power generation system 20 to the interconnection point 11 is 2 MW, which is the sum of the 1 MW generated by the first power generation facility 21 and the 1 MW generated by the second power generation facility 22. As described above, according to this embodiment, in contrast to the comparative example, power equivalent to the output limit value L can be supplied from the power generation system 20 to the interconnection point 11. That is, according to this embodiment, as described above, the power generated by the second power generation facility 22 can be effectively used to supply power to the interconnection point 11.

[0052] 11 illustrates a case where the output limit value L is 1 MW and the first power value P1 of the power from the existing first power generation facility 21 is 0.5 MW. The operation limit value C of the power storage facility 23 is −1 MW (charge capacity |C|=1 MW).

[0053] In the comparative example, the charging capacity |C| is set as the power generation upper limit value Z of the second power generation facility 22. That is, the power generation upper limit value Z is set to 1 MW. That is, the power supplied from the second power generation facility 22 and the power storage facility 23 to the interconnection point 11 is 0 MW. Therefore, even though the output limit value L is set to 1 MW, the power supplied from the power generation system 20 to the interconnection point 11 is only 1 MW generated by the first power generation facility 21.

[0054] On the other hand, in the present embodiment, the power generation upper limit value Z of the second power generation facility 22 is set to 1.5 MW (=1-0.5 MW+1 MW) using the above-described formula (1). Therefore, 1 MW of the power generated by the second power generation facility 22 is charged to the power storage facility 23, and the remaining 0.5 MW is supplied to the grid-connection point 11. That is, the power supplied from the power generation system 20 to the grid-connection point 11 is 1 MW, which is the sum of 0.5 MW generated by the first power generation facility 21 and 0.5 MW supplied from the second power generation facility 22. As described above, according to the present embodiment, in contrast to the comparative example, power equivalent to the output limit value L can be supplied from the power generation system 20 to the grid-connection point 11. That is, according to the present embodiment, the power generated by the second power generation facility 22 can be effectively used to supply power to the grid-connection point 11, as described above.

[0055] In this embodiment, the setting processing unit 43 sets the power generation upper limit value Z so that the power generation upper limit value Z monotonically increases with respect to the output limit value L. Therefore, in a situation where the output limit value L of the interconnection point 11 fluctuates, the power generated by the second power generation facility 22 can be effectively used to supply power to the interconnection point 11.

[0056] In this embodiment, the setting processing unit 43 sets the power generation upper limit value Z so that the power generation upper limit value Z monotonically decreases with respect to the first power value P1. Therefore, in a situation where the first power value P1 of the power generated by the first power generation facility 21 fluctuates, the power generated by the second power generation facility 22 can be effectively used to supply power to the interconnection point 11.

[0057] In this embodiment, the setting processing unit 43 sets the power generation upper limit value Z so that the power generation upper limit value Z monotonically increases with the charge capacity |C|. Therefore, in a situation where the charge capacity |C| of the power storage facility 23 fluctuates, the power generated by the second power generation facility 22 can be effectively used to supply power to the interconnection point 11.

[0058] In particular, in this embodiment, the power generation upper limit value Z of the second power generation facility 22 is set by subtracting the first power value P1 of power generation by the first power generation facility 21 and the operation limit value C of the power storage facility 23 from the output limit value L. Therefore, the power generation upper limit value Z of the second power generation facility 22 can be set to an optimal value with respect to the output limit value L of the interconnection point 11, the first power value P1 of power generation by the first power generation facility 21, and the operation limit value C (charge capacity |C|) of the power storage facility 23.

[0059] B: Modified example Specific modified embodiments that can be added to each of the embodiments exemplified above are exemplified below. Two or more embodiments arbitrarily selected from the following examples may be combined as appropriate within the scope of not being mutually contradictory.

[0060] (1) In the above embodiment, the power generation upper limit value Z changes continuously (for example, monotonically increases) with respect to the output limit value L, but the relationship between the power generation upper limit value Z and the output limit value L is not limited to the above example. For example, a form in which the power generation upper limit value Z changes stepwise or nonlinearly with respect to the output limit value L is also conceivable.

[0061] (2) In the above embodiment, the power generation upper limit value Z changes continuously (e.g., monotonically decreases) according to the first power value P1, but the relationship between the power generation upper limit value Z and the first power value P1 is not limited to the above example. For example, the power generation upper limit value Z may change stepwise or nonlinearly with respect to the output limit value L.

[0062] (3) In the above embodiment, the power generation upper limit value Z changes continuously according to the operational limit value C (charging capacity |C|), but the relationship between the power generation upper limit value Z and the operational limit value C (charging capacity |C|) is not limited to the above example. For example, the power generation upper limit value Z may change stepwise or nonlinearly with respect to the operational limit value C (charging capacity |C|).

[0063] (4) In the above-described embodiment, an example is given in which the setting processing unit 43 calculates the power generation upper limit value Z according to the mathematical formula (1). However, the arithmetic expression for calculating the power generation upper limit value Z is not limited to the above-described mathematical formula (1). For example, a form in which a predetermined coefficient is multiplied by each term (output limit value L, first power value P1, operation limit value C) of the mathematical formula (1) is also assumed.

[0064] (5) In the above-described embodiment, an example is given in which the setting processing unit 43 calculates the power generation upper limit value Z by the calculation of the mathematical formula (1). However, the method for the setting processing unit 43 to set the power generation upper limit value Z is not limited to the above examples. For example, the setting processing unit 43 may set the power generation upper limit value Z by using a reference table in which the numerical values of each information acquired by the information acquisition unit 41 are associated with the power generation upper limit value Z.

[0065] (6) In the above-described embodiment, the focus is mainly on the charging by the power storage device 23. However, the operation control unit 42 may generate an operation command X for instructing the power storage device 23 to discharge according to the configuration of FIG. 12. The operation control unit 42 in FIG. 12 generates the operation command X such that the current charge rate Ra of the power storage device 23 decreases to a target value Rb (Rb < Ra) over a predetermined time (hereinafter referred to as "correction time T"). That is, the operation command X specifies the power value required to correct the current charge rate Ra to the target value Rb at the correction time T. As illustrated in FIG. 12, the operation control unit 42 includes an arithmetic unit 51, a multiplication unit 52, a correction unit 53, an arithmetic unit 54, a limit unit 55, and an arithmetic unit 56.

[0066] The arithmetic unit 51 calculates the difference δ between the current charge rate Ra of the power storage device 23 and the target value Rb of the charge rate (δ = Ra - Rb). The charge rate Ra is notified to the control system 30 as the SOC (State Of Charge) from the power storage device 23, for example. The target value Rb is a predetermined value set in advance according to the specifications of the power storage device 23, for example.

[0067] The multiplication unit 52 calculates the amount of power H by multiplying the difference δ by the rated capacity α (kWh) of the power storage facility 23 (H=α×δ). The correction unit 53 calculates the power value Xa by dividing the amount of power H by the correction time T (Xa=H / T). The calculation unit 54 calculates the power value Xb by adding the second power value P2 of the power generated by the second power generation facility 22 to the power value Xa. The power value Xb is the total power generated by the power generation by the first power generation facility 21 and the discharge by the power storage facility 23.

[0068] The limiting unit 55 calculates the power value Xc by limiting the power value Xb to a predetermined range β. The lower limit of the range β is set to 0 W. The upper limit of the range β is set to an output limit value La. The output limit value La is a numerical value obtained by subtracting the first power value P1 of the power generated by the first power generation facility 21 from the output limit value L of the interconnection point 11 (La = L - P1). That is, the sum of the power generated by the second power generation facility 22 (second power value P2) and the power discharged by the power storage facility 23 is limited to within the range β. Therefore, the sum of the first power value P1 of the first power generation facility 21, the second power value P2 of the second power generation facility 22, and the power value of the power discharged by the power storage facility 23 (that is, the total power supplied to the interconnection point 11 from the entire power generation system 20) is suppressed to be equal to or less than the output limit value L.

[0069] The calculation unit 56 subtracts the second power value P2 of the second power generation equipment 22 from the power value Xc to calculate the power value that the power storage equipment 23 should discharge as the operation command X. As a result of transmitting the operation command X described above to the power storage equipment 23, the power storage equipment 23 discharges so that the charging rate Ra reaches the target value Rb at the correction time T.

[0070] (7) In the above embodiment, attention is focused on the interconnection point 11 of the power grid 10, but the point subject to the output limit value L is not limited to a point on the power grid 10. In other words, the point from which the power generation system 20 supplies power is not limited to the interconnection point 11.

[0071] For example, the output limit value L may be set for point 12 in Fig. 1 where the power generated by first power generation facility 21, the power generated by second power generation facility 22, and the power discharged by power storage facility 23 are combined within power system 100. Note that interconnection point 11 is a point managed by the power utility that operates power grid 10, and point 12 is an on-site point managed by the power utility that operates power system 100. Interconnection point 11 and point 12 are collectively referred to as a "combination point."

[0072] (8) In the above embodiment, a solar power generation system that converts solar energy into electric power is exemplified as the first power generation facility 21 and the second power generation facility 22, but the power generation method of each of the first power generation facility 21 and the second power generation facility 22 is not limited to the above example. For example, any type of power generation system that utilizes renewable energy, such as a wind power generation system that converts wind energy into electric power, a geothermal power generation system that converts geothermal energy into electric power, a hydroelectric power generation system that converts hydroelectric energy into electric power, or a biomass power generation system that converts biomass energy into electric power, may be used as each of the first power generation facility 21 and the second power generation facility 22. Note that the power generation method of the first power generation facility 21 and the power generation method of the second power generation facility 22 may be different.

[0073] (9) As described above, the functions of the control system 30 according to the above-described embodiment are realized through cooperation between one or more processors constituting the control device 31 and a program stored in the storage device 32. The programs exemplified above can be provided in a form stored on a computer-readable recording medium and installed on a computer. The recording medium is, for example, a non-transitory recording medium, such as an optical recording medium (optical disk) such as a CD-ROM, but also includes any known type of recording medium, such as a semiconductor recording medium or a magnetic recording medium. Note that a non-transitory recording medium includes any recording medium other than a transitory, propagating signal, and does not exclude volatile recording media. Furthermore, in a configuration in which a distribution device distributes a program via a communication network, the recording medium storing the program in the distribution device corresponds to the non-transitory recording medium described above.

[0074] (10) The term "nth" (n is a natural number) in this application is used only as a formal and convenient label to distinguish each element in the description and does not have any substantive meaning. Therefore, there is no room for restrictive interpretation of the position or order of each element based on the term "nth."

[0075] C: Notes The following configurations can be understood from the above-described exemplary embodiments. Note that, in order to facilitate understanding of each embodiment, reference numerals in the drawings are written in parentheses for convenience, but this is not intended to limit the present disclosure to the illustrated embodiments.

[0076] A control system (30) according to one aspect (aspect 1) of the present disclosure is a system for controlling a power generation system (20) that supplies power to a combination point (11, 12) using a first power generation facility (21) capable of generating power using renewable energy, a second power generation facility (22) capable of generating power using renewable energy, and a storage facility (23) that can charge and discharge power, and includes a setting processing unit (43) that sets an upper limit value (Z) of the power generated by the second power generation facility (22) in accordance with an output limit value (L) at the combination point (11, 12), a power value (P1) of the power generated by the first power generation facility (21), and an operation limit value (C) of the storage facility (23) so that the total power supplied to the combination point (11, 12) by the first power generation facility (21), the second power generation facility (22), and the storage facility (23) does not exceed the output limit value (L). In the above-described aspect, the upper limit (Z) of the power generated by the second power generating facility (22) is set in accordance with the output limit (L) at the combination point (11, 12), the power value (P1) of the power generated by the first power generating facility (21), and the operation limit (C) of the power storage facility (23). Therefore, compared to a configuration in which the operation limit (C) of the power storage facility (23) is set to the upper limit (Z) of the power generated by the second power generating facility (22), for example, the power generated by the second power generating facility (22) can be used more effectively to supply power to the combination point (11, 12).

[0077] In a specific example (aspect 2) of aspect 1, the setting processor (43) sets the upper limit value (Z) such that the upper limit value (Zc1) when the output limit value (L) is a first value (q1) is lower than the upper limit value (Zc2) when the output limit value (L) is a second value (q2) that is higher than the first value (q1). According to the above aspect, in a situation where the output limit value (L) of the combining point (11, 12) fluctuates, the power generated by the second power generating facility (22) can be effectively used to supply power to the combining point (11, 12).

[0078] The relationship that the upper limit value (Zc1) when the output limit value (L) is the first value (q1) and the upper limit value (Zc2) when the output limit value (L) is the second value (q2) does not have to hold throughout the entire range of the output limit value (L). In other words, even if the upper limit value (Z) does not fluctuate with fluctuations in the output limit value (L), the requirement of Mode 2 that the upper limit value (Zc1) is lower than the upper limit value (Zc2) is satisfied as long as there are first values ​​(q1) and second values ​​(q2) that satisfy the relationship that the upper limit value (Zc1) is lower than the upper limit value (Zc2).

[0079] In a specific example (Aspect 3) of Aspect 1 or Aspect 2, the setting processing unit (43) sets the upper limit (Z) such that the upper limit (Za1) when the power value (P1) of the power generated by the first power generation facility (21) is a first value (p1) exceeds the upper limit (Za2) when the power value (P1) of the power generated by the first power generation facility (21) is a second value (p2) that is higher than the first value (p1). According to the above aspect, in a situation where the power value (P1) of the power generated by the first power generation facility (21) fluctuates, the power generated by the second power generation facility (22) can be effectively used to supply power to the combination point (11, 12).

[0080] The relationship that the upper limit value (Za1) when the power value (P1) of the power generated by the first power generating facility (21) is a first value (p1) exceeds the upper limit value (Za2) when the power value (P1) of the power generated by the first power generating facility (21) is a second value (p2) that is higher than the first value (p1) does not need to hold true over the entire range of the power value (P1) of the power generated. In other words, even if the upper limit value (Z) does not fluctuate with the power value (P1) of the power generated, the requirement of Mode 3 that the upper limit value (Za1) exceeds the upper limit value (Za2) is satisfied as long as there are first and second values ​​(p1) and (p2) that satisfy the relationship that the upper limit value (Za1) exceeds the upper limit value (Za2).

[0081] In a specific example (Aspect 4) of any of Aspects 1 to 3, the setting processor (43) sets the upper limit (Z) such that the upper limit (Zb1) when the charge capacity indicated by the operation limit value (C) is a first value (c1) is lower than the upper limit (Zb2) when the charge capacity is a second value (c2) that is higher than the first value (c1). According to the above aspect, when the charge capacity of the power storage equipment (23) fluctuates, the power generated by the second power generation equipment (22) can be effectively used to supply power to the combination point (11, 12).

[0082] The relationship that the upper limit value (Zb1) when the charge capacity indicated by the operational limit value (C) is a first value (c1) and that the upper limit value (Zb2) when the charge capacity is a second value (c2) that is greater than the first value (c1) does not have to hold true over the entire range of the charge capacity indicated by the operational limit value (C). In other words, even if the upper limit value (Z) does not fluctuate with fluctuations in the charge capacity, the requirement of mode 4 that the upper limit value (Zb1) is less than the upper limit value (Zb2) is satisfied as long as there are first values ​​(c1) and second values ​​(c2) that satisfy the relationship that the upper limit value (Zb1) is less than the upper limit value (Zb2).

[0083] In a specific example (Aspect 5) of any one of Aspects 1 to 4, the setting processing unit (43) sets the upper limit value (Z) by subtracting the power value (P1) of the power generated by the first power generation facility (21) and the operation limit value (C) of the power storage facility (23) from the output limit value (L). According to the above aspect, the upper limit value (Z) of the power generated by the second power generation facility (22) can be set to an optimal value with respect to the output limit value (L) of the combination point (11, 12), the power value (P1) of the power generated by the first power generation facility (21), and the operation limit value (C) of the power storage facility (23).

[0084] A power system according to one aspect (aspect 6) of the present disclosure is a power system that supplies power to a combining point (11, 12), and includes a first power generation facility (21) capable of generating power using renewable energy, a second power generation facility (22) capable of generating power using renewable energy, a power storage facility (23) capable of charging and discharging power, and a control system (30) that sets an upper limit value (Z) of the power generated by the second power generation facility (22) in accordance with an output limit value (L) at the combining point (11, 12), a power value (P1) of the power generated by the first power generation facility (21), and an operating limit value (C) of the power storage facility (23) so that the total power supplied to the combining point (11, 12) by the first power generation facility (21), the second power generation facility (22), and the power storage facility (23) does not exceed the output limit value (L). [Explanation of symbols]

[0085] 100...power system, 10...power grid, 11...interconnection point, 12...location, 20...power generation system, 21...first power generation equipment, 22...second power generation equipment, 23...energy storage equipment, 30...control system, 31...control device, 32...storage device, 33...communication device, 41...information acquisition unit, 42...operation control unit, 43...setting processing unit.

Claims

1. a first power generation facility capable of generating electricity using renewable energy; a second power generation facility capable of generating electricity using renewable energy; Energy storage equipment capable of charging and discharging electricity A system for controlling a power generation system that supplies power to a combining point by a setting processing unit that sets an upper limit value of the power generated by the second power generation facility according to an output limit value at the combining point, a power value of the power generated by the first power generation facility, and an operation limit value of the power storage facility so that the total power supplied to the combining point by the first power generation facility, the second power generation facility, and the power storage facility does not exceed the output limit value. A control system comprising:

2. The setting processing unit sets the upper limit value such that the upper limit value when the output limit value is a first value is lower than the upper limit value when the output limit value is a second value that is higher than the first value. The control system of claim 1.

3. The setting processing unit sets the upper limit value when a power value of the power generated by the first power generation facility is a first value so as to exceed the upper limit value when a power value of the power generated by the first power generation facility is a second value that is higher than the first value. The control system of claim 1.

4. The setting processing unit sets the upper limit value such that the upper limit value when the charge capacity indicated by the operational limit value is a first value is lower than the upper limit value when the charge capacity is a second value that is higher than the first value. The control system of claim 1.

5. The setting processing unit sets the upper limit value by subtracting a power value of the power generated by the first power generation facility and an operation limit value of the power storage facility from the output limit value.

5. The control system according to claim 1.

6. 1. An electric power system for supplying electric power to a combining point, comprising: a first power generation facility capable of generating electricity using renewable energy; a second power generation facility capable of generating electricity using renewable energy; an electricity storage facility capable of charging and discharging electricity; a control system that sets an upper limit value of the power generated by the second power generation facility according to an output limit value at the combining point, a power value of the power generated by the first power generation facility, and an operation limit value of the power storage facility so that the total power supplied to the combining point by the first power generation facility, the second power generation facility, and the power storage facility does not exceed the output limit value; A power system comprising:

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