Power supply system

Abstract

This system provides a power supply system that can improve the power generation efficiency of distributed power generation equipment by utilizing surplus electricity. [Solution] The power supply system 100 includes an overall control device 30, distributed power generation devices, individual control devices, and individual loads are provided in multiple facilities A, B, C, and D respectively, and a shared load 70 that consumes power is provided in the shared area E. The distributed power generation devices are configured to output individual target power set within the range of power that can be generated, with the aim of supplying the individual load power required by the corresponding individual loads. The overall control device 30 includes an acquisition unit 31 that acquires the individual load power and the power generated by the distributed power generation devices. When the overall control device 30 determines that a first surplus power has been generated because the individual load power of the individual loads corresponding to the distributed power generation devices is less than the power generated by the distributed power generation devices in the same facilities A, B, C, and D, it supplies the first surplus power to the shared load 70.

Description

Technical Field

[0001] The present invention relates to a power supply system.

Background Art

[0002] Patent Document 1 discloses a fuel cell provided in an individual household in an apartment house or the like. The power supply system including this fuel cell calculates the power generation efficiency for each fuel cell and controls the power generation amount of each fuel cell so that the power generation efficiency is maximized.

[0003] Patent Document 2 discloses an excess power recovery heater for recovering excess power and using it as a heat source in order to suppress reverse power flow of excess power when an excess occurs in the power generation capacity of a gas engine generator.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When an excess power recovery heater described in Patent Document 2 is provided in the power supply system described in Patent Document 1, among the power generated by the fuel cell (corresponding to the "distributed power generation device" in the present application), the excess power is consumed by the excess power recovery heater (corresponding to the "excess power heater" in the present application). Since the excess power recovery heater has poor operating efficiency due to the characteristic of converting electricity into heat, there is room for improvement in terms of utilization of excess power.

[0006] An object of the present invention is to provide a power supply system that improves the power generation efficiency of a distributed power generation device by effectively utilizing excess power. [Means for solving the problem]

[0007] The characteristic configuration of the power supply system according to the present invention is a power supply system that supplies power to a plurality of facilities and a shared area, comprising a whole control device that controls the entire system, distributed power generation devices, individual control devices that control the distributed power generation devices, and individual loads that consume the power generated by the distributed power generation devices, each of the plurality of facilities, and a shared area load that consumes power is provided in the shared area, the distributed power generation devices are configured to output individual target power set within the range of power that can be generated with the aim of supplying the individual load power required by the corresponding individual loads, the whole control device comprises an acquisition unit that acquires the individual load power and the power generated by the distributed power generation devices, and the whole control device determines that a first surplus power has been generated because the individual load power of the individual load corresponding to the distributed power generation device is less than the power generated by the distributed power generation device in the same facility, and supplies the first surplus power to the shared area load.

[0008] In this configuration, if it is determined that a first surplus power has been generated, the first surplus power is supplied to the shared load. As a result, the power of the shared load can be covered by the power generated by the distributed power generation device, so the first surplus power can be effectively utilized and the power generation efficiency of the distributed power generation device can be improved.

[0009] In the present invention, the acquisition unit acquires the shared power, which is the sum of the first surplus power supplied from a plurality of facilities, and the shared load power required by the shared load. The overall control device, when it determines that a second surplus power has been generated because the shared load power is less than the shared power, preferably outputs a signal to lower the individual target power of at least one of the distributed power generation devices.

[0010] In this configuration, if the electricity supplied from multiple facilities cannot be fully consumed by the shared load, resulting in a second surplus of power, the individual target power is lowered. This reduces the output of the distributed power generation equipment, making it less likely for a second surplus of power to occur, thus suppressing the generation of surplus power.

[0011] In the present invention, if the overall control device determines that the shared load power exceeds the shared power, it is preferable to output a signal to increase the individual target power of all the distributed power generation devices by an amount equal to the value obtained by allocating the shared load power to the distributed power generation devices in a predetermined proportion.

[0012] If only a specific distributed power generation device is responsible for supplying the shared load power, only the cumulative power generated by that device will increase, which may necessitate premature maintenance. With this configuration, the shared load power is distributed among all distributed power generation devices in a predetermined proportion, thereby preventing an increase in the cumulative power generated by only a specific distributed power generation device.

[0013] In the present invention, it is preferable that the overall control device stops supplying the first surplus power to the shared load when it determines that the first surplus power has become zero.

[0014] In this configuration, if the first surplus power becomes zero, the distributed power generation equipment can prioritize supplying power to individual loads.

[0015] In the present invention, the acquisition unit acquires the shared load power required by the shared load, and the overall control device preferably outputs a signal to increase the individual target power of at least one of the distributed power generation devices if it determines that the sum of the individual load power and the shared load power during a predetermined period has not decreased compared to the sum of the individual load power and the shared load power during a period prior to the predetermined period.

[0016] In this configuration, if the total value of individual load power and shared load power does not decrease over a predetermined period, the individual target power of the distributed power generation equipment can be increased. As a result, the output of the distributed power generation equipment increases, making it easier to cover the individual load power and shared load power with the power generated by the distributed power generation equipment.

[0017] Another characteristic configuration of the power supply system according to the present invention is a power supply system that supplies power to a plurality of facilities and a common area, comprising a whole control device that controls the entire system, wherein a distributed power generation device, an individual control device that controls the distributed power generation device, individual loads that consume the power generated by the distributed power generation device, and a surplus power heater are provided in each of the plurality of facilities, and a common area load that consumes power is provided in the common area, the distributed power generation device is configured to output an individual target power set within the range of power that can be generated with the aim of supplying the individual load power required by the corresponding individual load, and the whole control device supplies the first surplus power supplied to the surplus power heater to the common area load when the surplus power heater that consumes the first surplus power generated when the individual load power of the individual load corresponding to the distributed power generation device is less than the power generated by the distributed power generation device in the same facility is activated.

[0018] In this configuration, when the surplus power heater is operating, the first surplus power supplied to the surplus power heater is supplied to the shared negative terminal. As a result, the power generated by the distributed power generation device can cover the power of the shared load, making effective use of the first surplus power and improving the power generation efficiency of the distributed power generation device. [Brief explanation of the drawing]

[0019] [Figure 1] This is an overall diagram of the power supply system. [Figure 2] This flowchart shows an example of power supply processing to a shared load. [Figure 3] This figure shows another example of a power supply system.

Embodiments for Carrying Out the Invention

[0020] Hereinafter, the power supply system according to this embodiment will be described based on the drawings.

[0021] As shown in FIG. 1, the power supply system 100 includes a plurality of facilities A, B, C, D, a switchboard 20, an overall control device 30, and a shared part E which is a location other than the facilities A, B, C, D. In this embodiment, the plurality of facilities A, B, C, D are a plurality of households in an apartment house. Also, the shared part E is a location other than the households in the apartment house. For example, the shared part E is a shared space such as a corridor, a rooftop, a garden, a staircase, etc.

[0022] The power supply system 100 is connected to the power grid 10 via the switchboard 20. The overall control device 30 can supply the grid power from the power grid 10 to the plurality of facilities A, B, C, D and the shared part E.

[0023] Distributed power generation devices 40, individual loads 50 that consume the power generated by the distributed power generation devices 40, surplus power heaters 60, individual power measurement devices (not shown), and individual control devices 45 for controlling the distributed power generation devices 40 are provided in the plurality of facilities A, B, C, D respectively.

[0024] As shown in FIG. 1, facility A includes a distributed power generation device 40A, an individual load 50A, a surplus power heater 60A, and an individual control device 45A. Facility B includes a distributed power generation device 40B, an individual load 50B, a surplus power heater 60B, and an individual control device 45B. The other facilities C and D have the same configuration.

[0025] 〔Distributed Power Generation Device〕 The distributed power generation device 40 is a device having a fuel cell. In this embodiment, the distributed power generation device 40 has a cell stack (not shown) composed of a plurality of fuel cell cells and a power conversion unit (not shown). The distributed power generation device 40 can output power within the range of power generation capacity (i.e., within the range of upper limit power value). The power generation capacity (upper limit power value) is, for example, the rated power generation capacity. In this embodiment, the power generation capacity is 700W. However, it is not limited to this, and the power generation capacity may be other values.

[0026] The distributed power generation device 40 is configured to output individual target power, which is set within the range of power that can be generated, with the aim of supplying the individual load power required by the corresponding individual load 50. Here, the individual target power includes a predetermined power and the power updated by feedback of the individual load power consumed by the individual load 50.

[0027] In each facility A, B, C, and D, if the individual load power of the individual loads 50 corresponding to the distributed power generation device 40 is less than the power generated by the distributed power generation device 40 within the same facility, the difference in power becomes surplus power (first surplus power) in that facility. When first surplus power is generated, it is supplied to the shared load 70 of the shared area E.

[0028] Furthermore, if the individual load power of the individual loads 50 corresponding to the distributed power generation device 40 exceeds the power generated by the distributed power generation device 40 within the same facility, the excess power becomes a power shortage at that facility. If a power shortage occurs at each facility A, B, C, and D, the power shortage is covered by increasing the output of the distributed power generation device 40 by raising the individual target power within the range of the power that can be generated, or by power from the power grid 10.

[0029] Individual loads 50 can receive power generated by distributed power generation equipment 40 within the same facility. Individual power measurement devices measure the individual load power consumed by individual loads 50 and output it to individual control devices 45 or overall control devices 30.

[0030] [Individual control devices] The individual control unit 45 comprises a CPU (Central Processing Unit) that executes programs and a memory unit (not shown). The individual control unit 45 functions when programs stored in memory are executed. The memory unit stores information about the distributed power generation device 40, information about the individual loads 50, insufficient power, first surplus power, and the operating status of the surplus power heater 60. The memory unit is composed of, for example, an HDD, ROM, or non-volatile memory.

[0031] The individual control unit 45 controls the corresponding distributed power generation equipment 40 within the same facility. The individual control unit 45 controls the start and stop operation of the distributed power generation equipment 40, as well as setting and updating individual target power levels.

[0032] Information regarding the distributed power generation device 40 includes the power that can be generated, individual target power, and generated power.

[0033] Information regarding individual load power includes the individual load power of individual load 50, etc.

[0034] The individual control unit 45 communicates with the overall control unit 30 and transmits information regarding the distributed power generation device 40, information regarding the individual loads 50, power shortages, first surplus power, and the operating status of the surplus power heater 60 to the overall control unit 30.

[0035] The shared area E is equipped with a shared area load 70 that consumes power, and a shared area power measuring device (not shown). The shared area load 70 is electrical equipment. For example, electrical equipment may include lighting, elevators, water pumps, etc. The shared area power measuring device measures the shared area load power consumed by the shared area load 70 and outputs it to the overall control device 30. Shared area load power is the power required by the shared area load 70. Note that the distributed power generation device 40 is not provided in the shared area E.

[0036] [Overall control system] The overall control unit 30 is equipped with a CPU (Central Processing Unit) that executes programs. The overall control unit 30 functions by executing programs stored in memory. When the overall control unit 30 determines that a first surplus power has been generated, it supplies the first surplus power to the shared load 70. Specifically, the overall control unit 30 determines the amount of the first surplus power to be supplied to the shared load 70. In this embodiment, the overall control unit 30 determines that all of the first surplus power generated at one facility will be supplied to the shared load 70. However, the overall control unit 30 may also determine that only a portion of the first surplus power generated at one facility will be supplied to the shared load 70. Next, the overall control unit 30 transmits information regarding the first surplus power to be supplied to the shared load 70 to the individual control units 45. The individual control units 45 of each facility A, B, C, and D cause the distributed power generation device 40 to supply the first surplus power to the shared load 70.

[0037] As shown in Figure 1, the overall control device 30 includes an acquisition unit 31 and a storage unit 32.

[0038] The acquisition unit 31 acquires information regarding the distributed power generation equipment 40 (individual target power, power that can be generated, and power generated), information regarding individual load power, insufficient power, first surplus power, and the operating status of the surplus power heater 60 from the individual control devices 45 of each facility A, B, C, and D.

[0039] Furthermore, the acquisition unit 31 acquires the shared power, which is the sum of the first surplus power supplied to the shared load 70 from multiple facilities A, B, C, and D, and the shared load power.

[0040] The storage unit 32 is composed of, for example, an HDD, ROM, or non-volatile memory. The storage unit 32 stores the changes over time of individual target power, power that can be generated, power generated by the distributed power generation device 40, individual load power, insufficient power, first surplus power, the operating status of the surplus power heater 60, shared power, and shared load power.

[0041] [Examples of surplus power for each facility] As shown in Figure 1, at facility A, the power generated by the distributed power generator 40A is 600W, which is less than the rated power. The individual load power of the individual load 50A is 500W. In other words, the individual load power of the individual load 50A is supplied by the power generated by the distributed power generator 40A. Furthermore, the first surplus power at facility A is 100W. This first surplus power is consumed by the surplus power heater 60A. In other words, the surplus power heater 60A is operating at facility A.

[0042] At facility B, the power generated by the distributed power generator 40B is 300W, which is less than the rated power. Also, the individual load power of individual load 50B is 300W. In other words, the individual load power of individual load 50B is supplied by the power generated by the distributed power generator 40B. No surplus power is generated at facility B. In other words, the surplus power heater 60B is not operating at facility B.

[0043] At facility C, the distributed power generator 40C generates 600W, which is less than its rated power. The individual load power of individual load 50C is 550W. In other words, the individual load power of individual load 50C is supplied by the power generated by the distributed power generator 40C. Furthermore, the first surplus power at facility C is 50W. This first surplus power is consumed by the surplus power heater 60C. In other words, the surplus power heater 60C is operating at facility C.

[0044] At facility D, the distributed power generator 40D generates 400W, which is less than its rated power. The load power of individual load 50D is 350W. In other words, the individual load power of individual load 50D is supplied by the power generated by the distributed power generator 40D. Furthermore, the first surplus power at facility D is 50W. This first surplus power is consumed by the surplus power heater 60D. In other words, the surplus power heater 60D is operating at facility D.

[0045] Therefore, in the example shown in Figure 1, the overall control device 30 determines that a first surplus power is generated in facilities A, C, and D, and instructs the distributed power generators 40A, 40C, and 40D to supply the first surplus power to the shared load 70.

[0046] [Regarding power supply processing to shared loads] Next, an example of the power supply process to the shared load 70 will be described with reference to Figure 1 and the flowchart in Figure 2. The overall control device 30 continuously executes this flowchart at predetermined timings while the distributed power generation device 40 is performing power generation operation. The steps described below may be performed in any order, and multiple steps may be performed simultaneously, as long as no inconsistencies arise. Note that the distributed power generation device 40 is initially set to normal operation mode.

[0047] The acquisition unit 31 acquires the power generated by the distributed power generation device 40 and the individual load power of the individual loads 50 (step #01). Specifically, the acquisition unit 31 continuously acquires the individual load power and the power generated by the distributed power generation device 40 from the individual control device 45 at regular intervals. For example, the acquisition unit 31 acquires the individual load power and the power generated by the distributed power generation device 40 every 10 minutes. However, the acquisition unit 31 may also acquire the individual load power and the power generated by the distributed power generation device 40 stored in the storage unit 32.

[0048] The overall control device 30 determines whether or not a first surplus power has been generated (step #02). Whether or not a first surplus power has been generated is determined by comparing the current power generated by the distributed power generator 40, acquired by the acquisition unit 31, with the individual load power of the individual loads 50 within the same facility as the distributed power generator 40. In other words, the overall control device 30 determines that a first surplus power has been generated if the individual load power of the individual loads 50 corresponding to the distributed power generator 40 is less than the power generated by the distributed power generator 40 within the same facility. However, whether or not a first surplus power has been generated may also be determined by whether or not the surplus power heater 60 is operating. In other words, the overall control device 30 may determine whether or not a first surplus power has been generated based on the operating status of the surplus power heater 60 acquired by the acquisition unit 31.

[0049] If the overall control device 30 determines that a first surplus power has been generated (Step #02: Yes), it switches at least one distributed power generation device 40 to the flexible operation mode (Step #03). In the example in Figure 1, a first surplus power has been generated at facilities A, C, and D. Therefore, the overall control device 30 switches distributed power generation devices 40A, 40C, and 40D to the flexible operation mode.

[0050] In the shared operation mode, the distributed power generation device 40 supplies the first surplus power consumed by the surplus power heater 60 to the shared load 70 (step #04). Specifically, the overall control device 30 outputs a signal to the individual control device 45 to supply the first surplus power to the shared load 70. The individual control device 45 controls the distributed power generation device 40 to supply the power generated by the distributed power generation device 40 (first surplus power) to the shared load 70.

[0051] In the example shown in Figure 1, distributed power generator 40A supplies 100W of first surplus power to the shared load 70. Distributed power generator 40C supplies 50W of first surplus power to the shared load 70. Distributed power generator 40D supplies 50W of first surplus power to the shared load 70. In other words, the total surplus power supplied to the shared load 70 is 200W. In this case, the shared load power is 200W, so the shared load power can be covered by the surplus power. The surplus power calculated by the overall control device 30 is stored in the storage unit 32.

[0052] Next, the acquisition unit 31 continuously acquires the shared power and the shared load power of the shared load 70 at regular intervals (step #05). Specifically, the acquisition unit 31 acquires the shared load power from the shared power measuring device. The acquisition unit 31 also acquires the shared power stored in the storage unit 32. For example, the acquisition unit 31 acquires the shared power and the shared load power every minute. However, the acquisition unit 31 may also acquire the shared load power stored in the storage unit 32.

[0053] The overall control device 30 determines whether or not a second surplus power has been generated (step #06). Whether or not a second surplus power has been generated is determined by comparing the power exchange acquired by the acquisition unit 31 with the load power of the shared section. The overall control device 30 determines that a second surplus power has been generated if the load power of the shared section is less than the power exchange.

[0054] If the overall control unit 30 determines that a second surplus power has been generated (step #06: Yes), it outputs a signal to reduce the individual target power of at least one distributed power generation device 40 (step #07). Specifically, the overall control unit 30 sends a signal to the individual control unit 45 to reduce the individual target power of the distributed power generation device 40. The individual control unit 45 updates the individual target power of the distributed power generation device 40. The distributed power generation device 40 reduces its power output based on the updated individual target power. If it determines that no second surplus power has been generated, the process proceeds to step #05 (step #06: No).

[0055] The acquisition unit 31 acquires the individual load power and the power generated by the distributed power generation device 40 again. The overall control device 30 determines whether the first surplus power has become zero (step #08). If it is determined that the first surplus power has not become zero (step #08: No), the process proceeds to step #05.

[0056] If it is determined that the first surplus power has become zero (Step #08: Yes), the overall control device 30 switches the distributed power generation device 40, which is in flexible operation mode, to normal operation mode (Step #09) and completes the process normally. In other words, if the overall control device 30 determines that the first surplus power has become zero, it stops supplying the first surplus power to the shared load 70.

[0057] In normal operation mode, the distributed power generation device 40 supplies the generated power to individual loads 50 or surplus power heaters 60. In other words, in normal operation mode, the power for the shared load is supplied by grid power from the power grid 10. On the other hand, in the flexible operation mode, the power for the shared load is supplied by the power generated by the distributed power generation device 40 (first surplus power) and grid power from the power grid 10.

[0058] If it is determined that no surplus power is generated (Step #02: No), the acquisition unit 31 acquires the individual load power and the shared load power (Step #11).

[0059] The overall control device 30 determines whether the total value of individual load power and shared load power during a predetermined period is lower than the total value of individual load power and shared load power during a period prior to the predetermined period (step #12). If it is determined that the total value of individual load power and shared load power during the predetermined period is lower than the total value of individual load power and shared load power during a period prior to the predetermined period (step #12: Yes), the process is completed successfully.

[0060] If it is determined that the sum of the individual load power and shared load power during a predetermined period has not decreased compared to the sum of the individual load power and shared load power during a period prior to the predetermined period (Step #12: No), the overall control unit 30 outputs a signal to increase the individual target power of at least one distributed power generation device 40 (Step #13). The individual control unit 45 updates the individual target power of the distributed power generation device 40. The distributed power generation device 40 increases its power output based on the updated individual target power and proceeds to the process in Step #02.

[0061] Furthermore, in the shared operation mode, if the overall control device 30 determines that the shared load power exceeds the shared power, it may send a signal to all individual control devices 45 indicating that it will increase the individual target power of all distributed power generators 40 by an amount equal to the value obtained by allocating the shared load power to the distributed power generators 40 in a predetermined proportion.

[0062] [Another embodiment] The present invention is not limited to the embodiments described above. For example, it may be configured as in the following alternative embodiments. In the alternative embodiments described below, components identical to those in the embodiments are denoted by the same numbers and reference numerals as in the embodiments described above.

[0063] (1) As shown in Figure 3, it is not necessary for multiple facilities A, B, C, and D to be equipped with surplus power heaters 60. In the example in Figure 3, the shared load power of the shared load 70 has increased from 200W to 400W. In other words, the overall control device 30 determines that the sum of the individual load power and shared load power for a predetermined period has not decreased compared to the sum of the individual load power and shared load power for a period prior to the predetermined period (Step #12: No). Since the individual target power of each distributed power generation device 40A, 40B, 40C, and 40D is below the power that can be generated, it is possible to increase the individual target power.

[0064] In this embodiment, the individual control unit 45A updates the individual target power of the distributed power generation unit 40A from the current 600W to the rated power generation power of 700W. The distributed power generation unit 40A increases its power output based on the updated individual target power. The individual control unit 45B updates the individual target power of the distributed power generation unit 40B from the current 300W to 400W. The distributed power generation unit 40B increases its power output based on the updated individual target power. The individual control unit 45C updates the individual target power of the distributed power generation unit 40C from the current 600W to the rated power generation power of 700W. The distributed power generation unit 40C increases its power output based on the updated individual target power. The individual control unit 45D updates the individual target power of the distributed power generation unit 40D from the current 400W to 500W. The distributed power generation unit 40D increases its power output based on the updated individual target power. As a result, the total of the first surplus power is 400W. This first surplus power is supplied to the shared load 70. This allows the shared load power to be covered by the first surplus power (shared power) supplied from each facility A, B, C, and D.

[0065] (2) In the embodiments described above, the multiple facilities A, B, C, and D are multiple dwelling units in an apartment building. However, the multiple facilities A, B, C, and D may take other forms. For example, the multiple facilities A, B, C, and D may be multiple rooms in an office.

[0066] (3) In the above embodiment, the facilities included in the power supply system 100 are four facilities A, B, C, and D, but the number of facilities included in the power supply system 100 is not limited to these, and there may be two or more.

[0067] (4) In the above-described embodiment, the distributed power generation device 40 is a fuel cell power generation device that generates electricity using a fuel cell. However, it is not limited to this, and the distributed power generation device 40 may be, for example, a solar power generation device that generates electricity using sunlight, or an engine power generation device that generates electricity using an engine.

[0068] (5) In the above embodiment, the overall control device 30 switches the distributed power generation system 40 from normal operation mode to flexible operation mode. However, the individual control devices 45 may also switch the distributed power generation system 40 from normal operation mode to flexible operation mode.

[0069] (6) In the above embodiment, the overall control device 30 determines whether a second surplus power has been generated by comparing the power exchanged with the power of the shared load. However, the overall control device 30 may also determine whether a second surplus power has been generated based on the first surplus power of each facility A, B, C, and D acquired by the acquisition unit 31 and the power of the shared load. In other words, the overall control device 30 may determine whether a second surplus power has been generated before the first surplus power is supplied to the shared load 70. In this case, the overall control device 30 outputs a signal to lower the individual target power of at least one distributed power generation device 40, reduces the power output of the distributed power generation device 40, and then supplies the first surplus power to the shared load 70.

[0070] (7) In the above embodiment, if it is determined that the first surplus power has become zero, the overall control device 30 stops supplying the first surplus power to the shared load 70. However, the overall control device 30 may also stop supplying the first surplus power to the shared load 70 when the first surplus power has decreased to a certain extent. In this case, the first surplus power is consumed by the surplus power heater 60.

[0071] (8) The configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, insofar as they do not cause a contradiction, and the embodiments disclosed herein are illustrative, and the embodiments of the present invention are not limited thereto and can be modified as appropriate without departing from the object of the present invention. [Explanation of Symbols]

[0072] 30: Overall control unit 31: Acquisition part 40: Distributed power generation system 50 :Individual load 60: Surplus power heater 70 :Shared part load 100: Power supply system A: Facility B: Facility C: Facility D: Facility E: Common area

Claims

1. A power supply system that supplies electricity to multiple facilities and shared areas, It is equipped with a central control unit that controls the entire system, A distributed power generation system, an individual control device for controlling the distributed power generation system, and individual loads for consuming the electricity generated by the distributed power generation system are provided in each of the multiple facilities. A shared load that consumes power is provided in the shared section. The distributed power generation system is configured to output individual target power set within the range of power generation capacity, with the goal of supplying the individual load power required by the corresponding individual loads. The overall control device includes an acquisition unit that acquires the individual load power and the power generated by the distributed power generation device. The overall control device is a power supply system that, when it determines that a first surplus power has been generated because the individual load power of the individual loads corresponding to the distributed power generation device is less than the power generated by the distributed power generation device within the same facility, supplies the first surplus power to the shared load.

2. The acquisition unit acquires the shared power, which is the sum of the first surplus power supplied from the multiple facilities, and the shared load power required by the shared load, The power supply system according to claim 1, wherein the overall control device determines that a second surplus power has been generated because the shared load power is less than the circulating power, and outputs a signal to reduce the individual target power of at least one of the distributed power generation devices.

3. The power supply system according to claim 2, wherein the overall control device determines that the shared load power exceeds the shared power, and outputs a signal to increase the individual target power of all the distributed power generation devices by an amount equal to the value obtained by allocating the shared load power to the distributed power generation devices in a predetermined proportion.

4. The power supply system according to claim 1, wherein the overall control device determines that the first surplus power has become zero, and stops supplying the first surplus power to the shared load.

5. The acquisition unit acquires the shared load power required by the shared load, The power supply system according to claim 1, wherein the overall control device determines that the total value of the individual load power and the shared load power during a predetermined period has not decreased compared to the total value of the individual load power and the shared load power during a period prior to the predetermined period, and outputs a signal to increase the individual target power of at least one of the distributed power generation devices.

6. A power supply system that supplies electricity to multiple facilities and shared areas, It is equipped with a central control unit that controls the entire system, A distributed power generation system, an individual control device for controlling the distributed power generation system, an individual load for consuming the electricity generated by the distributed power generation system, and a surplus power heater are provided in each of the multiple facilities. A shared load that consumes power is provided in the shared section. The distributed power generation system is configured to output individual target power set within the range of power generation capacity, with the goal of supplying the individual load power required by the corresponding individual loads. The overall control device is a power supply system that, when the surplus power heater that consumes the first surplus power generated when the individual load power of the individual loads corresponding to the distributed power generation device is less than the power generated by the distributed power generation device in the same facility is activated, supplies the first surplus power supplied to the surplus power heater to the shared load.

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