Method for operating power system and device for controlling power system

Abstract

This method for operating a power system (200) comprises: a step for planning the output (FC) of a fuel cell system (b) in a second period (T2) after a first period (T1) so as to compensate for the difference between the actual value of the power demand in the first period and the actual value of the output (PV) of a solar power generation system (a); a step for charging a battery system (c) when the sum of the output of the solar power generation system and the output of the fuel cell system is greater than a power demand (D) when the fuel cell system generates power at a planned output during the second period; when the fuel cell system generates power according to the planned output during the second period, if the sum of the output of the solar power generation system and the output of the fuel cell system is smaller than the power demand, discharging the storage battery system so as to satisfy the power demand, and if the sum of the output of the solar power generation system and the output of the fuel cell system is smaller than the power demand, discharging the storage battery system so as to satisfy the power demand; the first period is a period immediately before the second period, the second period is longer than the first period, and the planned output of the fuel cell system is fixed during the second period.

Description

Technical Field

[0001] The present disclosure relates to an operation method of a power system for supplying electric power (power supply), etc. Background Art

[0002] Conventionally, a power supply system for supplying electric power has been proposed (for example, refer to Patent Document 1). This power supply system includes a power conditioning device for adjusting the electric power supplied from a solar power generation (photovoltaic power generation) device as a natural energy power generation device, a storage battery, a hydrogen production device, and a fuel cell. Moreover, the power supply system supplies the electric power obtained from the solar power generation device, the storage battery, and the fuel cell to a facility, and further supplies the surplus electric power to the storage battery or the hydrogen production device. In addition, the power supply system predicts the power generation amount of the solar power generation device, and based on the predicted power generation amount, that is, the predicted value, etc., determines the amount of electric power charged and discharged by the storage battery, the amount of electric power supplied to the hydrogen production device, and the amount of electric power supplied from the fuel cell. Thereby, it is possible to continuously supply electric power that meets the facility demand.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: International Publication No. 2017 / 013751 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] However, in the operation method of the power supply system, that is, the power system including a solar power generation device, a storage battery, and a fuel cell in Patent Document 1 above, a method for the power supply system to meet the power demand of a facility without using the predicted value of the power generation amount of the solar power generation device has not been explored.

[0008] Therefore, the present disclosure provides an operation method of a power system, etc., which is a method for the power system to meet the power demand of a power consumer without using the predicted value of the power generation amount of the solar power generation device in a power system including a solar power generation device, a storage battery, and a fuel cell.

[0009] Technical Solutions for Solving the Problems

[0010] One technical solution of the present disclosure relates to an operation method of a power system, which includes the following steps: planning the output of a fuel cell system during a second period after a first period to make up for the difference between the actual value of the power demand during the first period and the actual value of the output of a solar power generation system; when the fuel cell system generates electricity according to the planned output during the second period, charging a battery system when the sum of the output of the solar power generation system and the output of the fuel cell system is greater than the power demand; when the fuel cell system generates electricity according to the planned output during the second period, discharging the battery system to meet the power demand when the sum of the output of the solar power generation system and the output of the fuel cell system is less than the power demand, where the first period is the period immediately before the second period, the second period is longer than the first period, and the planned output of the fuel cell system is fixed (remains unchanged) during the second period.

[0011] In addition, these general or specific technical solutions can be implemented either by a system, a method, an integrated circuit, a computer program, or a recording medium such as a computer-readable CD-ROM, or by any combination of a system, a method, an integrated circuit, a computer program, and a recording medium. Additionally, the recording medium can also be a non-transitory recording medium.

[0012] Advantages of the Invention

[0013] According to the operation method of the power system of the present disclosure, in a power system equipped with a solar power generation device, a battery, and a fuel cell, the power system can meet the power demand of power consumers without using the predicted value of the power generation amount of the solar power generation device.

[0014] Further advantages and effects in one technical solution of the present disclosure can be known from the description and the drawings. The above advantages and / or effects are respectively provided by several embodiments and the configurations described in the description and the drawings, but it is not necessary to provide all the configurations to obtain the advantages and effects. Description of the Drawings

[0015] Figure 1 It is a diagram showing a configuration example of the entire system including the power system and the control device of the power system in the embodiment.

[0016] Figure 2 It is a diagram for explaining the output of the fuel cell power generation device planned by the control device in the embodiment.

[0017] Figure 3 It is a block diagram showing an example of the functional structure of the control device in the embodiment.

[0018] Figure 4It is a diagram showing an example of the generated power of a fuel cell power generation device and the charge / discharge power of a battery device controlled by a control device in an embodiment.

[0019] Figure 5 It is a flowchart showing an example of the processing operation of a data acquisition unit in an embodiment.

[0020] Figure 6 It is a flowchart showing an example of the processing operation of a fuel cell output calculation unit in an embodiment.

[0021] Figure 7 It is a flowchart showing an example of the processing operation of a battery output calculation unit in an embodiment.

[0022] Figure 8 It is a flowchart showing an example of the processing operation of a third controller in an embodiment.

[0023] Figure 9 It is a diagram showing an example of the effects obtained according to the operation mode of the control device in an embodiment. Detailed Embodiment

[0024] The operation method of the power system according to one technical solution of the present disclosure includes the following steps: a step of planning the output of the fuel cell system within a second period after a first period to make up for the difference between the actual value of the power demand within the first period and the actual value of the output of the solar power generation system; when the fuel cell system generates power at the planned output within the second period, a step of charging the battery system when the sum of the output of the solar power generation system and the output of the fuel cell system is greater than the power demand; when the fuel cell system generates power at the planned output within the second period, a step of discharging the battery system to meet the power demand when the sum of the output of the solar power generation system and the output of the fuel cell system is less than the power demand, where the first period is the period immediately preceding the second period, the second period is longer than the first period, and the planned output of the fuel cell system is fixed within the second period. In addition, the power system includes, for example, a solar power generation system, a fuel cell system, and a battery system. The solar power generation system includes a solar power generation device, the fuel cell system includes a fuel cell, and the battery system includes a battery. Further, the power demand is, for example, the power consumption (power consumption) of a load possessed by a power consumer, and the output of each of the solar power generation system and the fuel cell system is, for example, the generated power.

[0025] Accordingly, compared with the case of planning the output of the battery system to compensate for the difference between the actual value of the power demand in the first period and the actual value of the output of the solar power generation system, the power demand can be further met by the power of the power system. The background is that the battery system is superior to the fuel cell system in terms of load following performance. On the other hand, the power storage capacity of the fuel cell system is larger than that of the battery system. In view of this background, in this technical solution, for the difference between the power demand and the solar power generation amount in the second period, the fuel cell system is planned to fill the power as the basic power supply, and for the temporary difference that cannot be filled, the power of the battery system with excellent load following performance is used to fill it. Thus, it becomes a form that complements the above-mentioned advantages and disadvantages of the fuel cell system and the battery system, and the power demand of the load can be further met by the power of the power system. That is to say, according to this technical solution, the power purchase from the power organization (grid-connected power energy storage system) for meeting the power demand of the load is reduced.

[0026] In addition, compared with the case of planning the output of the fuel cell system in the second period using the actual value in the first period that is longer than the second period, the deviation of the output of the fuel cell system in the second period from the difference between the power demand of the load and the output of the solar power generation system can be suppressed. This is because, compared with the case of planning the output of the fuel cell system in the second period using the actual value in the first period that is longer than the second period, the output of the fuel cell system will be planned by only considering the actual value of the period closer to the second period. Furthermore, since the output of the fuel cell system remains fixed in the second period that is longer than the first period, the deterioration of the fuel cell system can be suppressed.

[0027] In addition, the output of the fuel cell system in the second period can also be planned to be the median (mid-value) of the difference between the actual value of the power demand in the first period and the actual value of the output of the solar power generation system.

[0028] For example, calculate the difference at each of multiple time points in the first period, and set the output of the fuel cell system in the second period to the median of these differences. Thus, in the situation where the actual value of the first period continues in the second period, the difference between the power demand in the second period and the output of the solar power generation system can be appropriately compensated by the output of the fuel cell system. As a result, the charge and discharge of the battery system can be suppressed.

[0029] In addition, the output of the fuel cell system in the second period can also be planned to be the average value of the difference between the actual value of the power demand in the first period and the actual value of the output of the solar power generation system.

[0030] For example, the difference at each of the multiple time points in the first period is calculated, and the output of the fuel cell system in the second period is set to the average value of these differences. Thus, if the actual value in the first period continues in the second period, the difference between the power demand in the second period and the output of the solar power generation system can be appropriately compensated by the output of the fuel cell system. As a result, the charging and discharging of the battery system can be suppressed.

[0031] In addition, a technical solution of the present disclosure involves a control device for an electric power system comprising a memory and a controller, wherein the memory stores an actual value of electric power demand during a first period and an actual value of an output of a solar power generation system, and the controller plans the output of the fuel cell system during a second period after the first period to compensate for the difference between the actual value of electric power demand during the first period and the actual value of the output of the solar power generation system, and when the fuel cell system generates electric power according to the planned output during the second period, if the sum of the output of the solar power generation system and the output of the fuel cell system is greater than the electric power demand, the battery system is charged, and when the fuel cell system generates electric power according to the planned output during the second period, if the sum of the output of the solar power generation system and the output of the fuel cell system is less than the electric power demand, the battery system is discharged to meet the electric power demand, wherein the first period is a period immediately before the second period, the second period is longer than the first period, and the planned output of the fuel cell system is fixed during the second period.

[0032] This can produce the same effects as the above-mentioned method of operating the power system.

[0033] Hereinafter, the embodiments will be described in detail with reference to the drawings.

[0034] In addition, the embodiments described below all represent general or specific examples. The numerical values, shapes, materials, constituent elements, configuration positions and connection forms of constituent elements, steps, and the order of steps shown in the following embodiments are only examples and are not intended to limit the present disclosure. In addition, for the constituent elements in the following embodiments that are not recorded in the independent claims representing the highest concept, they are described as arbitrary constituent elements.

[0035] In addition, each figure is a schematic diagram, and is not necessarily a strictly illustrated figure. In addition, in each figure, the same reference numeral is given to the same component.

[0036] (Implementation Method)

[0037] Figure 1This is a diagram showing a configuration example of the entire system including the power system and the control device of the power system in this embodiment. In addition, in Figure 1 the power line is represented by a solid line, and the communication line is represented by a dashed line.

[0038] The power system 200 in this embodiment is connected to the power organization 100 and the load 301 via a power line. Moreover, the power system 200 supplies power to the load 301. In addition, the power organization 100 has the function of supplying system power (grid-connected power generation power) and is connected to the load 301 via a power line. In addition, the system power is also called commercial power and is, for example, alternating current of 50 Hz or 60 Hz. Therefore, when the power supplied from the power system 200 is insufficient with respect to the power consumption of the load 301, the power organization 100 supplies the insufficient part of the power to the load 301. On the other hand, when the power supplied from the power system 200 is surplus with respect to the power consumption of the load 301, the surplus power is received by the power organization 100, that is to say, the surplus power is sold as reverse power flow power. In addition, the load 301 in this embodiment includes one or more machines, devices, equipment, etc. that consume electricity. In addition, the power consumption of the load 301 is also called the power demand. In addition, power consumers such as factories and facilities have the load 301.

[0039] The power system 200 includes a solar power generation system a, a fuel cell system b, and a battery system c. The solar power generation system a includes a first controller 210, a solar power generation device 211, a first PCS (Power Conditioning System) 212, and a first power meter (electricity meter, wattmeter) 213.

[0040] The solar power generation device 211 has, for example, one or more solar power generation units, converts sunlight into power by photoelectric conversion, and outputs the power. The solar power generation unit is, for example, a solar power generation panel. In addition, the solar power generation device 211 is also simply referred to as a solar cell hereinafter. The first PCS 212 converts the power output from the solar power generation device 211 into power of the same quality as the system power and outputs it. The first power meter 213 measures the power output from the solar power generation device 211 via the first PCS 212, that is, the system power, and outputs a signal indicating the measured power (power) to the control device 10. The first controller 210 controls the solar power generation device 211 and the first PCS 212. For example, the first controller 210 controls the solar power generation device 211 and the first PCS 212 according to an instruction from the control device 10.

[0041] The fuel cell system b includes a second controller 220, a fuel cell power generation device 221, a second PCS 222, and a second power meter 223.

[0042] The fuel cell power generation device 221 has, for example, one or more fuel cell units, and generates electricity by causing a chemical reaction between hydrogen and oxygen. The hydrogen source used for power generation is, for example, a hydrogen storage device or a hydrogen energy infrastructure. The fuel cell unit is, for example, a fuel cell stack device. In addition, the fuel cell power generation device 221 is also simply referred to as a fuel cell hereinafter. The second PCS 222 converts the power output by the power generation of the fuel cell power generation device 221 into power of the same quality as the system power and outputs it. The second power meter 223 measures the power output from the fuel cell power generation device 221 via the second PCS 222, that is, the system power, and outputs a signal indicating the measured power to the control device 10. The second controller 220 controls the fuel cell power generation device 221 and the second PCS 222. For example, the second controller 220 adjusts the power output from the fuel cell power generation device 221 and the second PCS 222 according to an instruction from the control device 10.

[0043] The battery system c includes a third controller 230, a battery device 231, a third PCS 232, and a third power meter 233.

[0044] The battery device 231 has, for example, one or more battery units, and performs charging or discharging. The battery unit is, for example, a battery pack. In addition, the battery device 231 is also simply referred to as a battery hereinafter. The third PCS 232 converts the power output by the discharge of the battery device 231 into power of the same quality as the system power and outputs it. Alternatively, the third PCS 232 converts the system power and charges the battery device 231. The third power meter 233 measures the power output from the battery device 231 via the third PCS 232, that is, the system power, and outputs a signal indicating the measured power to the control device 10. In addition, the third power meter 233 measures the power output from the solar power generation device 211 or the fuel cell power generation device 221 and charged into the battery device 231, and outputs a signal indicating the measured power to the control device 10. The third controller 230 controls the battery device 231 and the third PCS 232. For example, the third controller 230 adjusts the power discharged from the battery device 231 or the power for charging the battery device 231 according to an instruction from the control device 10.

[0045] The control device 10 in the present embodiment is a control device of the power system 200, and is connected to the fourth power meter 303, the power system 200, and the database 20 via communication lines respectively. That is to say, the control device 10 communicates with the fourth power meter 303, the power system 200, and the database 20 via communication lines respectively. In addition, in the present embodiment, the power notified, transmitted, instructed, obtained, or received via the communication line is not the power itself, but data indicating the magnitude of the power, such as wattage. In addition, the fourth power meter 303 measures the power consumption of the load 301.

[0046] Such a control device 10 receives signals representing the power measured by each of the first power meter 213, the second power meter 223, the third power meter 233, and the fourth power meter 303 at a sampling period. Moreover, the control device 10 writes the power represented by these signals into the database 20. In addition, a specific example of the sampling period is 30 seconds or 1 minute, etc., but is not limited to these times.

[0047] The database 20 is a recording medium for recording power values and the like. In addition, the recording medium is a hard disk drive, a RAM (Random Access Memory), a ROM (Read Only Memory), or a semiconductor memory, etc. In addition, the recording medium can be volatile or non-volatile. In addition, in the present embodiment, the database 20 is not provided in the control device 10, but can also be provided in the control device 10.

[0048] Figure 2 It is a diagram for explaining the output of the fuel cell power generation device 221 planned by the control device 10. Specifically, Figure 2 The graph of () schematically represents the power at each moment. The horizontal axis of the graph represents the moment, and the vertical axis represents the power (kW).

[0049] As Figure 2 As shown in the graph of (), the control device 10 in the present embodiment plans the output of the fuel cell power generation device 221, that is, the power generation power FC of the fuel cell power generation device 221, at the planned time point of the moment "12:00" during the control period T2. In addition, the control period T2 is also referred to as the second period. In a specific example, the control period T2 is 1 hour from the moment "12:00" of the planned time point to the moment "13:00".

[0050] More specifically, the control device 10 reads out the power consumption D of the load 301 and the power generation PV of the solar power generation device 211 within the sampling period T1 after the planned time point from the database 20. That is to say, the control device 10 reads out the past power consumption D of the load 301 and the past power generation PV of the solar power generation device 211 obtained at the above-mentioned sampling period within the sampling period T1. Moreover, the control device 10 plans the power generation FC of the fuel cell power generation device 221 during the control period T2 to make up for the difference between the power consumption D of the load 301 and the power generation PV of the solar power generation device 211 within the sampling period T1. In addition, the sampling period T1 is also referred to as the first period. In a specific example, when the sampling period is 1 minute, the sampling period T1 corresponding to the control period T2 is 15 minutes from the time "11:44" to the time "11:59". In this case, 15 differences can be obtained within the sampling period T1. In addition, when the sampling period is 30 seconds, the sampling period T1 corresponding to the control period T2 can also be 15 minutes from the time "11:44:30" to the time "11:59:30". In this case, 30 differences can be obtained within the sampling period T1.

[0051] Moreover, the control device 10 controls the fuel cell power generation device 221 and the second PCS 222 via the second controller 220 so that the power generation FC of the planned fuel cell power generation device 221 is output during the control period T2.

[0052] Furthermore, when the fuel cell power generation device 221 generates power of the planned power generation FC during the control period T2, the control device 10 controls the battery device 231 and the third PCS 232 via the third controller 230. Specifically, when the sum of the power generation PV of the solar power generation device 211 and the power generation FC of the fuel cell power generation device 221 is greater than the power consumption D of the load 301, the control device 10 charges the battery device 231. On the other hand, when the above sum is less than the power consumption D, the control device 10 discharges the battery device 231 to meet the power consumption D.

[0053] In addition, the power consumption D of the load 301 is the power measured by the fourth power meter 303. Further, the generated power PV of the solar power generation device 211 is the power output from the solar power generation device 211 via the first PCS 212 and is measured by the first power meter 213. The generated power PV of such a solar power generation device 211 can also be said to be the output of the solar power generation system a or the solar power generation device 211. Similarly, the generated power FC of the fuel cell power generation device 221 is the power output from the fuel cell power generation device 221 via the second PCS 222 and is the power measured by the second power meter 223. The generated power FC of such a fuel cell power generation device 221 can also be said to be the output of the fuel cell system b or the fuel cell power generation device 221.

[0054] Thus, in the present embodiment, the first period as the sampling period T1 is the period immediately before the second period as the control period T2. Further, the second period is longer than the first period, and the planned output of the fuel cell system b is fixed within the second period. In addition, the output of the fuel cell system b corresponds to the generated power FC of the fuel cell power generation device 221. Here, the period immediately before the second period is, in the present embodiment, the period from the following start time point to the end time point. That is to say, the end time point is the measurement time point of each of the plurality of powers recorded in the database 20 that is the closest measurement time point from the above-mentioned planned time point. Moreover, the start time point is the time point obtained by tracing back the sampling period T1 from the end time point, for example, a time point 15 minutes back. However, the first period as the period immediately before the second period is merely an example and is not limited to the present embodiment. For example, the start time point of the first period may also be a time point after tracing back the time of the second period from the planned time point as the start time point of the second period. In other words, as long as it is a period before the start time point of the second period and after a point earlier than the start time point of the second period by the time of the second period, the first period can be arbitrary. In addition, as long as the first period is shorter than the second period, it is not limited to 15 minutes and may be 30 minutes or the like. In other words, the first period may also be a period that is 1 / 2 or less of the second period.

[0055] In addition, in the operation method of the power system 200 executed by the control device 10 in the present embodiment, as described above, based on the difference between the past power consumption D of the load 301, i.e., the actual value, and the past power generation PV of the solar power generation device 211, i.e., the actual value, the output of the fuel cell power generation device 221 during the control period T2 is planned. Moreover, the fuel cell power generation device 221 outputs according to this plan. Therefore, in the operation method in the present embodiment, the output of the fuel cell power generation device 221 is prioritized over the output of the battery device 231. For this reason, the operation method in the present embodiment is also referred to as a fuel cell priority application mode or a hydrogen priority application mode. This operation method is used because when the hydrogen source of the fuel cell power generation device 221 is, for example, a hydrogen storage device or a hydrogen energy infrastructure, an output capacity larger than that of the battery device 231 can be ensured.

[0056] Figure 3 is a block diagram showing an example of the functional structure of the control device 10. In addition, in Figure 3 for simplicity of explanation, the first PCS 212, the second PCS 222, and the third PCS 232 are omitted. In addition, in Figure 3 in order to make the communication relationship between the respective components easy to understand, the communication lines are represented by solid lines and the power lines are represented by dashed lines.

[0057] The control device 10 in the present embodiment includes a data acquisition unit 11, a fuel cell output calculation unit 12, and a battery output calculation unit 13.

[0058] The data acquisition unit 11 acquires four power signals from the fourth power meter 303, the first power meter 213, the second power meter 223, and the third power meter 233 at the sampling period described above. Moreover, the data acquisition unit 11 writes the respective values of the four powers as actual values into the database 20. The four powers are respectively the power consumption D of the load 301, the power generation PV of the solar power generation device 211, the power generation FC of the fuel cell power generation device 221, and the discharge power Bd or the charge power Bc of the battery device 231. The discharge power Bd and the charge power Bc are collectively referred to as the charge and discharge power SB.

[0059] In addition, the discharge power Bd of the battery device 231 in the present embodiment is the power discharged from the battery device 231 via the third PCS 232 and is the power measured by the third power meter 233. Similarly, the charge power Bc of the battery device 231 in the present embodiment is the power charged from the solar power generation device 211 or the fuel cell power generation device 221, etc. to the battery device 231 via the third PCS 232 and is the power measured by the third power meter 233.

[0060] The fuel cell output calculation unit 12 reads out the power consumption D of the load 301 and the power generation PV of the solar power generation device 211 during the sampling period T1 immediately preceding the planned time point from the database 20. Further, the fuel cell output calculation unit 12 calculates the power generation FC of the fuel cell power generation device 221 during the control period T2 using the power consumption D and the power generation PV. Thus, the planned power generation FC is obtained. That is to say, the fuel cell output calculation unit 12 in the present embodiment plans the output of the fuel cell system b, that is, the power generation FC, during the control period T2, which is the second period, after the sampling period T1, which is the first period, so as to make up for the difference between the actual value of the power demand during the first period and the actual value of the output of the solar power generation system a. In addition, the output of the solar power generation system a corresponds to the power generation PV of the solar power generation device 211. The fuel cell output calculation unit 12 instructs the second controller 220 via the communication line to generate the power generation FC (issues an instruction to generate the power generation FC to the second controller 220). The second controller 220 controls the fuel cell power generation device 221 and the second PCS 222 in accordance with the instruction from the fuel cell output calculation unit 12.

[0061] When the fuel cell power generation device 221 generates the planned power generation FC during the above control period T2, the battery output calculation unit 13 reads out the latest three powers from the database 20 at the battery instruction cycle. The three powers are respectively the power consumption D of the load 301, the power generation PV of the solar power generation device 211, and the power generation FC of the fuel cell power generation device 221. In addition, a specific example of the battery instruction cycle is 1 minute. Further, the battery output calculation unit 13 calculates the power that the battery device 231 should discharge or charge based on the three read powers. The battery output calculation unit 13 instructs the calculated power to the third controller 230 via the communication line. That is to say, the battery output calculation unit 13 outputs the discharge power instruction value Bd' or the charge power instruction value Bc' indicating the calculated power to the third controller 230. The third controller 230 controls the battery device 231 and the third PCS 232 in accordance with the instruction from the battery output calculation unit 13.

[0062] Figure 4 It is a diagram showing an example of the power generation FC of the fuel cell power generation device 221 and the charge / discharge power SB of the battery device 231 controlled by the control device 10. Figure 4 (a) is a chart schematically showing the time variation of the power consumption D of the load 301 and the power generation PV of the solar power generation device 211. Figure 4 (b) is a chart schematically showing the time variation of the power generation FC of the fuel cell power generation device 221. Figure 4Chart (c) schematically shows the time variation of the charge / discharge power SB of the battery device 231. In addition, the horizontal axis of these charts represents time, and the vertical axis represents power.

[0063] For example, as Figure 4 shown in (a), the power consumption D of the load 301 and the generated power PV of the solar power generation device 211 change between the time “00:00” and the time “24:00”. Here, the fuel cell output calculation unit 12 of the control device 10 plans the generated power FC of the fuel cell power generation device 221 during the control period T2 after the time point ta1, which is the planned time point. At this time, as Figure 4 shown in (d), the fuel cell output calculation unit 12 calculates the generated power FC such that the power consumption D of the load 301 during the sampling period T1 is equal to the sum of the generated power PV of the solar power generation device 211 and the generated power FC of the fuel cell power generation device 221. The calculated generated power FC is planned as the generated power FC of the fuel cell power generation device 221 during the control period T2 after the time point ta1. Thereby, it is possible to suppress the reverse power flow during the control period T2, as well as power purchase, that is, surplus power and deficit power.

[0064] The fuel cell output calculation unit 12 uses the control period T2 as one cycle and repeatedly executes the calculation of the generated power FC like this. Whenever the generated power FC is calculated, it instructs the second controller 220 to generate the generated power FC. As a result, as Figure 4 shown in (b), the second controller 220 controls the fuel cell power generation device 221 to generate the generated power FC. Here, the fuel cell power generation device 221 has a rated output and a minimum output. For example, the rated output is 500 kW and the minimum output is 150 kW. Therefore, when the generated power FC instructed by the fuel cell output calculation unit 12 exceeds the rated output, the second controller 220 may also cause the fuel cell power generation device 221 to perform power generation at the rated output. Moreover, when the generated power FC instructed by the fuel cell output calculation unit 12 is lower than the minimum output, the second controller 220 may also cause the fuel cell power generation device 221 to perform power generation at the minimum output.

[0065] Moreover, the battery output calculation unit 13 calculates the charge / discharge power SB of the battery device 231 at the above-mentioned battery instruction cycle. At this time, as Figure 4As shown in (e), the battery output calculation unit 13 calculates the charge / discharge power SB of the battery device 231 such that the sum of the latest generated power PV of the solar power generation device 211, the latest generated power FC of the fuel cell power generation device 221, and the charge / discharge power SB of the battery device 231 is equal to the power consumption D of the latest load 301. Further, the battery output calculation unit 13 instructs the third controller 230 to discharge or charge the charge / discharge power SB. That is, the battery output calculation unit 13 outputs a discharge power command value Bd' or a charge power command value Bc' to the third controller 230. As a result, as shown in (c) of Figure 4 , the third controller 230 controls the battery device 231 to discharge or charge the charge / discharge power SB. Thereby, it is possible to suppress the instantaneous reverse power flow during the control period T2 and the power purchase, that is, the instantaneous surplus power and deficit power.

[0066] That is, when the fuel cell system b generates power according to the planned output during the second period which is the control period T2 in the present embodiment, the battery output calculation unit 13 charges the battery system c when the sum of the output of the solar power generation system a and the output of the fuel cell system b is greater than the power demand. On the other hand, when the fuel cell system b generates power according to the planned output during the second period which is the control period T2, the battery output calculation unit 13 discharges the battery system c to meet the power demand when the sum of the output of the solar power generation system a and the output of the fuel cell system b is less than the power demand. In addition, the charging and discharging of the battery system c correspond to the charging and discharging of the battery device 231.

[0067] In addition, during the period from the time ta2 to the time ta3 in Figure 4 , although the generated power PV of the solar power generation device 211 is large, it is not possible to make the generated power FC of the fuel cell power generation device 221 lower than the minimum output. Therefore, the surplus amount of the generated power PV is charged to the battery device 231 as a large charge power Bc. On the other hand, during the period from the time ta4 to the time ta5, although the generated power PV of the solar power generation device 211 is small, it is not possible to make the generated power FC of the fuel cell power generation device 221 higher than the rated output. Therefore, the deficit amount of the generated power PV or the generated power FC is discharged from the battery device 231 as a large discharge power Bd.

[0068] The control device 10 in such an embodiment can be said to be a device having a memory and a controller. The memory is a recording medium that stores the power consumption D of the load 301 and the power generation PV of the solar power generation device 211 during the sampling period T1 read out by the fuel cell output calculation unit 12. In addition, the recording medium is a hard disk drive, RAM, ROM, or semiconductor memory, etc. Further, the recording medium can be volatile or non-volatile. That is to say, the memory stores the actual value of the power demand during the first period and the actual value of the output of the solar power generation system a. In addition, the controller has the functions of the fuel cell output calculation unit 12 and the battery output calculation unit 13 respectively. That is to say, the controller plans the output of the fuel cell system b during the second period to make up for the above difference by functioning as the fuel cell output calculation unit 12. Furthermore, the controller charges and discharges the battery system c by functioning as the above battery output calculation unit 13.

[0069] In addition, as described above, the control device 10 in this embodiment may also include a database 20. In this case, the memory may also be used as the database 20.

[0070] In addition, each component such as the data acquisition unit 11 and the controller included in the control device 10 may be configured as dedicated hardware or a circuit. In addition, each component may also be implemented by executing a software program. That is to say, each component may also be implemented by a program execution unit such as a CPU (Central Processing Unit) or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory. In addition, the control device 10 may be composed of a single controller for centralized control or may be composed of multiple controllers that cooperate with each other for decentralized control.

[0071] Figure 5 It is a flowchart showing an example of the processing operation of the data acquisition unit 11.

[0072] The data acquisition unit 11 executes the processing of steps S1 to S4 and S6 at the sampling period. That is to say, the data acquisition unit 11 acquires a signal representing the power consumption D of the load 301 from the fourth power meter 303 (step S1). Furthermore, the data acquisition unit 11 acquires a signal representing the power generation PV of the solar power generation device 211 from the first power meter 213 (step S2). Furthermore, the data acquisition unit 11 acquires a signal representing the power generation FC of the fuel cell power generation device 221 from the second power meter 223 (step S3). Furthermore, the data acquisition unit 11 acquires a signal representing the discharge power Bd or the charge power Bc of the battery device 231 from the third power meter 233 (step S4).

[0073] Next, the data acquisition unit 11 writes the power consumption D of the load 301 represented by the signal acquired in step S1 and the power of the three batteries represented by the signals acquired in steps S2 to S4 into the database 20 (step S6). In addition, the power of the three batteries is the power generation power PV of the solar power generation device 211, the power generation power FC of the fuel cell power generation device 221, and the discharge power Bd or the charge power Bc of the battery device 231.

[0074] Figure 6 It is a flowchart showing an example of the processing operation of the fuel cell output calculation unit 12.

[0075] The fuel cell output calculation unit 12 reads out the power consumption D of the load 301 and the power generation power PV of the solar power generation device 211 at each of the plurality of measurement time points within the most recent sampling period T1 at the planned time point from the database 20 (step S11).

[0076] Next, the fuel cell output calculation unit 12 calculates, for each of the plurality of measurement time points, the difference between the power consumption D of the load 301 and the power generation power PV of the solar power generation device 211 at that measurement time point. That is to say, the fuel cell output calculation unit 12 calculates, for each of the plurality of measurement time points, the difference at that measurement time point by subtracting the power generation power PV at that measurement time point from the power consumption D at that measurement time point. Further, the fuel cell output calculation unit 12 calculates the median value of the differences at each of the plurality of measurement time points as the difference value 1 (step S12). In addition, in the present embodiment, the median value of the differences at each of the plurality of measurement time points is an example of the difference value 1, and the difference value 1 may also be the average value of these differences.

[0077] That is to say, the fuel cell output calculation unit 12 in the present embodiment plans the output of the fuel cell system b within the second period so as to be the median value of the difference between the actual value of the power demand within the first period and the actual value of the output of the solar power generation system a. Or, the fuel cell output calculation unit 12 plans the output of the fuel cell system b within the second period so as to be the average value of the difference between the actual value of the power demand within the first period and the actual value of the output of the solar power generation system a.

[0078] Then, the fuel cell output calculation unit 12 determines whether the difference value 1 is a positive value (step S13). Here, when the fuel cell output calculation unit 12 determines that the difference value 1 is a positive value (step S13: Yes), it sets the generated power FC of the fuel cell power generation device 221 to the difference value 1 (step S14). On the other hand, when the fuel cell output calculation unit 12 determines that the difference value 1 is not a positive value (step S13: No), it sets the generated power FC of the fuel cell power generation device 221 to 0 (step S15). That is to say, when the difference value 1 is not a positive value, the generated power PV of the solar power generation device 211 is above the power consumption D of the load 301, and there is no shortage in the power supply to the load 301. Therefore, the generated power FC of the fuel cell power generation device 221 is set to 0. In other words, the generated power FC is set in such a way that the fuel cell power generation device 221 does not output.

[0079] The fuel cell output calculation unit 12 instructs the second controller 220 to generate the generated power FC set in step S14 or S15 (step S16). Upon receiving such an instruction, the second controller 220 controls the fuel cell power generation device 221 and the second PCS 222. As a result, the generated power FC set in step S14 or S15 is output from the fuel cell power generation device 221 via the second PCS 222.

[0080] Then, the fuel cell output calculation unit 12 determines whether the control period T2 has elapsed after the instruction in step S16 is issued (step S17). Here, when the fuel cell output calculation unit 12 determines that the control period T2 has not elapsed (step S17: No), it repeatedly executes the process of step S17. On the other hand, when the fuel cell output calculation unit 12 determines that the control period T2 has elapsed (step S17: Yes), it repeatedly executes the process of step S11. Thus, the processes of steps S11 to S17 are repeatedly executed at the control period T2.

[0081] Figure 7 It is a flowchart showing an example of the processing operation of the battery output calculation unit 13.

[0082] The battery output calculation unit 13 executes the processes of steps S21 to S27 according to the above-described battery instruction cycle. Specifically, the battery output calculation unit 13 reads the latest three powers from the database 20 (step S21). The three powers are the consumed power D of the load 301, the generated power PV of the solar power generation device 211, and the generated power FC of the fuel cell power generation device 221. Further, the battery output calculation unit 13 calculates the difference between the consumed power D of the read load 301, the generated power PV of the solar power generation device 211, and the generated power FC of the fuel cell power generation device 221 as a difference value 2 (step S22). That is to say, the battery output calculation unit 13 calculates the difference value 2 according to "difference value 2 = D - PV - FC", in other words, by subtracting the generated power PV and the generated power FC from the consumed power D.

[0083] Next, the battery output calculation unit 13 determines whether the difference value 2 is positive (step S23). Here, when the battery output calculation unit 13 determines that the difference value 2 is positive (step S23: YES), it sets the discharge power command value Bd' of the battery device 231 to the difference value 2 (step S24). Then, the battery output calculation unit 13 instructs the third controller 230 to discharge with the discharge power command value Bd' (step S25).

[0084] On the other hand, when the battery output calculation unit 13 determines that the difference value 2 is not positive (step S23: NO), it sets the charge power command value Bc' of the battery device 231 to the absolute value of the difference value 2 (step S26). Then, the battery output calculation unit 13 instructs the third controller 230 to charge with the charge power command value Bc' (step S27).

[0085] Figure 8 It is a flowchart showing an example of the processing operation of the third controller 230. Specifically, Figure 8 the flowchart shows Figure 7 an example of the processing operation performed by the third controller 230 after the instruction in step S25 or S27 of the flowchart.

[0086] When the third controller 230 receives an instruction from the battery output calculation unit 13, it determines whether the instruction, i.e., the command value, is a discharge power command value Bd′ or a charge power command value Bc′ (step S31). Here, when the third controller 230 determines that the command value is the discharge power command value Bd′ (step S31: Bd′), it determines whether the SOC (State Of Charge) of the battery device 231 is above the SOC lower limit value (step S32). In addition, the SOC of the battery device 231 is also referred to as the battery SOC. Further, the SOC lower limit value is a predetermined value, for example, stored in the third controller 230. Also, the battery SOC being above the SOC lower limit value means that the battery SOC is greater than the SOC lower limit value. That is to say, in step S32, it is determined whether the battery SOC is greater than the SOC lower limit value.

[0087] Moreover, when the third controller 230 determines that the battery SOC is above the SOC lower limit value (step S32: Yes), it further determines whether the discharge power command value Bd′ exceeds the rated output of the battery device 231 (step S33). Here, when the third controller 230 determines that the discharge power command value Bd′ does not exceed the rated output (step S33: No), it controls the battery device 231 and the third PCS 232 so that the discharge power Bd of the battery device 231 becomes the difference value 2 (step S34). In addition, the discharge power Bd of the battery device 231 is the power discharged from the battery device 231 via the third PCS 232. That is to say, the battery device 231 discharges an amount equal to the difference value 2 via the third PCS 232.

[0088] On the other hand, when the third controller 230 determines that the discharge power command value Bd′ exceeds the rated output (step S33: Yes), it controls the battery device 231 and the third PCS 232 so that the discharge power Bd of the battery device 231 becomes the rated output (step S35). That is to say, the battery device 231 discharges at the rated output via the third PCS 232. Also, when the third controller 230 determines that the battery SOC is not above the SOC lower limit value (step S32: No), it controls the battery device 231 and the third PCS 232 so that the discharge power Bd of the battery device 231 becomes 0 (step S36). That is to say, the battery device 231 does not discharge.

[0089] In addition, when it is determined in step S31 that the command value is the charging power command value Bc' (step S31: Bc'), the third controller 230 determines whether the battery SOC is below the SOC upper limit value (step S37). Further, the SOC upper limit value is a predetermined value, for example, stored in the third controller 230. In addition, the battery SOC being below the SOC upper limit value means that the battery SOC is less than the SOC upper limit value. That is to say, in step S37, it is determined whether the battery SOC is less than the SOC upper limit value.

[0090] Moreover, when the third controller 230 determines that the battery SOC is below the SOC upper limit value (step S37: Yes), it further determines whether the charging power command value Bc' exceeds the rated output of the battery device 231 (step S38). Here, when the third controller 230 determines that the charging power command value Bc' does not exceed the rated output (step S38: No), it controls the battery device 231 and the third PCS 232 so that the charging power Bc of the battery device 231 becomes the absolute value of the difference value 2 (step S39). In addition, the charging power Bc of the battery device 231 is the power for charging the battery device 231 via the third PCS 232. That is to say, the battery device 231 performs charging in an amount equal to the absolute value of the difference value 2.

[0091] On the other hand, when the third controller 230 determines that the charging power command value Bc' exceeds the rated output (step S38: Yes), it controls the battery device 231 and the third PCS 232 so that the charging power Bc of the battery device 231 becomes the rated output (step S40). That is to say, the battery device 231 performs charging at the rated output. In addition, when the third controller 230 determines that the battery SOC is not below the SOC upper limit value (step S37: No), it controls the battery device 231 and the third PCS 232 so that the charging power Bc of the battery device 231 becomes 0 (step S41). That is to say, the battery device 231 does not charge.

[0092] In addition, in the case where the battery device 231 is composed of a plurality of battery cells, the third controller 230 may also execute, for each of the plurality of battery cells, Figure 8 each step included in the flowchart. In this case, the discharge power command value Bd' and the charging power command value Bc' used for each battery cell may also be values obtained by dividing the command value of the entire battery device 231 by the number of battery cells included in the battery device 231.

[0093] In addition, in the present embodiment, the third controller 230 has a function of controlling the discharge power Bd and the charge power Bc of the battery device 231 based on the charge power command value Bc' and the discharge power command value Bd'. However, the battery output calculation unit 13 of the control device 10 may also have this function. That is to say, the battery output calculation unit 13 may also execute Figure 8 each step included in the flowchart shown. In this case, the data acquisition unit 11 acquires the battery SOC from the third controller 230 at the same timing as the power consumption D of the load 301, the power generation PV of the solar power generation device 211, etc., and stores it in the database 20. Moreover, in Figure 7 step S21 of, the battery output calculation unit 13 further reads out the latest battery SOC from the database 20, and uses the read battery SOC for Figure 8 steps S32 and S37. On the other hand, the third controller 230 controls the battery device 231 and the third PCS 232 according to the discharge power Bd and the charge power Bc determined by the battery output calculation unit 13 through the processes of steps S34 to S36 and S39 to S41.

[0094] Figure 9 is a diagram showing an example of the effect obtained according to the operation mode of the control device 10 in the present embodiment. In Figure 9 it, the effect obtained according to the operation mode of the control device 10 is shown in comparison with the operation mode of the comparative example.

[0095] In the operation mode of the comparative example, for each time period in the past one year, the average value of the difference between the power consumption D of the load 301 and the power generation PV of the solar power generation device 211 is calculated. Moreover, this average value is planned as the power generation FC of the fuel cell power generation device 221 in this time period. For example, for each time period of 0 to 1 o'clock, 1 to 2 o'clock, 2 to 3 o'clock,... in the past one year from January 1st to December 31st, the average value of the above-mentioned difference is calculated. That is to say, the average value of the difference at 365 points is calculated for each time period. Moreover, for example, the average value of 0 to 1 o'clock is planned as the power generation FC of the fuel cell power generation device 221 from the current time point to 0 to 1 o'clock.

[0096] In such an operation mode of the comparative example, the on-site self-sufficiency rate for the whole year is 63.3%, and the system power rate for the whole year is 36.7%. The on-site self-sufficiency rate is the ratio of the amount of electricity supplied from the power system 200 and consumed by the load 301 to the total power consumption of the load 301. The system power rate is the ratio of the amount of electricity supplied from the power organization 100 and consumed by the load 301 to the total power consumption of the load 301.

[0097] On the other hand, in the operation mode of the control device 10 in the present embodiment, the on-site self-sufficiency rate for the whole year can reach 100%, and the system power amount rate for the whole year can reach 0%. That is to say, it is possible to effectively reduce the surplus and shortage of the power supplied to the power consumption D, that is, the power demand of the load 301 during the second period. In other words, so-called self-generation and self-consumption can be achieved.

[0098] In addition, the on-site self-sufficiency rate of 100% and the system power amount rate of 0% are the values obtained when the power system 200 has the following configuration. That is to say, in this configuration, the solar power generation device 211 includes 1,800 solar panels, and the maximum output of the entire solar power generation device 211 is 500 kW. The fuel cell power generation device 221 includes 100 hydrogen fuel cells, and the maximum output or rated output of the entire fuel cell power generation device 221 is 500 kW. In addition, the hydrogen fuel cell is also referred to as a fuel cell stack device. In addition, the control range of the fuel cell power generation device 221 is from the rated output to 0 kW. In addition, the maximum output of each hydrogen fuel cell is 5 kW. Moreover, the control period T2 is 1 hour. The maximum output or rated output of the battery device 231 is 300 kW, and the capacity of the battery device 231 is 1,000 kWh.

[0099] As described above, in the present embodiment, the output of the fuel cell system b during the control period T2, that is, the second period after the planned sampling period T1, that is, the first period, is used to make up for the difference between the actual value of the power demand during the first period and the actual value of the output of the solar power generation system a. Furthermore, when the fuel cell system b generates power according to the planned output during the second period, when the sum of the output of the solar power generation system a and the output of the fuel cell system b is greater than the power demand, the battery system c is used for charging. On the other hand, when the fuel cell system b generates power according to the planned output during the second period, when the sum of the output of the solar power generation system a and the output of the fuel cell system b is less than the power demand, the battery system c discharges to meet the power demand.

[0100] Accordingly, compared with the case where the output of the planned battery system c is used to make up for the difference between the actual value of the power demand during the sampling period T1 (i.e., the first period) and the actual value of the output of the solar power generation system a, the power demand can be further satisfied by the power of the power system 200. The background is that the battery system c is superior to the fuel cell system b in terms of load following performance. On the other hand, the power storage capacity of the fuel cell system b is larger than that of the battery system c. In view of this background, in the present embodiment, for the difference between the power demand and the solar power generation amount during the control period T2 (i.e., the second period), the fuel cell system b is used as the basic power supply as planned to fill the power, and for the temporary difference that cannot be filled, the power of the battery system c with excellent load following performance is used to fill it. Thus, a form is formed in which the above-mentioned advantages and disadvantages of the fuel cell system b and the battery system c are complementary, and the power demand of the load can be further satisfied by the power of the power system 200. That is to say, according to the present embodiment, the power purchase from the power organization 100 for satisfying the power demand of the load is reduced.

[0101] In addition, in the present embodiment, as Figure 2 shown, the actual value during a short period such as the sampling period T1 is used to plan the output of the fuel cell power generation device 221 during a long period such as the subsequent control period T2.

[0102] Accordingly, compared with the case where the actual value during the first period longer than the second period is used to plan the output of the fuel cell system during the second period, the deviation of the output of the fuel cell system during the second period with respect to the difference between the power demand of the load and the output of the solar power generation system a can be suppressed. This is because, compared with the case where the actual value during the first period longer than the second period is used to plan the output of the fuel cell system b during the second period, the output of the fuel cell system b will be planned by considering only the actual value of the period closer to the second period. Furthermore, since the output of the fuel cell power generation device 221 during this long period is maintained fixed, the deterioration of the fuel cell power generation device 221 can be suppressed.

[0103] In addition, in the present embodiment, since, as Figure 6 in step S12, the median value of the difference is used, in the case where the actual value during the first period continues during the second period, the difference between the power demand during the second period and the output of the solar power generation device 211 can be appropriately made up by the output of the fuel cell power generation device 221. As a result, the charge and discharge of the battery device 231 can be suppressed.

[0104] Alternatively, in the present embodiment, even in Figure 6In step S12, the average value of the difference is used instead of the median value of the difference, and the output of the fuel cell power generation device 221 can also appropriately compensate for the difference between the power demand during the second period and the output of the solar power generation device 211. As a result, the charge and discharge of the battery device 231 can be suppressed.

[0105] As described above, based on the above-described embodiment, the operation method of the power system 200 of the present disclosure and the control device 10 have been described. However, the present disclosure is not limited to this embodiment. As long as it does not deviate from the gist of the present disclosure, the embodiments obtained by making various modifications that can be conceived by those skilled in the art to the above-described embodiment can also be included in the present disclosure.

[0106] For example, in the above-described embodiment, the control device 10 communicates with the database 20, the power system 200, and the fourth power meter 303 via a communication line. However, this communication is not limited to wired communication and can also be wireless communication. The wireless communication can be performed via Wi-Fi (registered trademark), Bluetooth (registered trademark), ZigBee (registered trademark), or specific low-power radio.

[0107] In addition, in the above-described embodiment, each component can also be configured by dedicated hardware or can be implemented by executing a software program suitable for each component. Each component can also be implemented by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory. Here, the software for implementing the control device 10 and the power system 200 of the above-described embodiment is a computer program that causes a computer to execute Figures 5 to 8 each step of the flowcharts shown.

[0108] In addition, the following cases are also included in the present disclosure.

[0109] (1) The above-described at least one device is specifically a computer system including a microprocessor, a ROM, a RAM, a hard disk unit, a display unit, a keyboard, a mouse, etc. A computer program is stored in the RAM or the hard disk unit. The above-described at least one device realizes its function by the microprocessor operating according to the computer program. Here, the computer program is constituted by combining a plurality of command codes representing instructions to the computer in order to realize a predetermined function.

[0110] (2) Part or all of the constituent elements constituting the above-described at least one device may also be constituted by a system LSI (Large Scale Integration). A system LSI is a super-multi-functional LSI manufactured by integrating a plurality of constituent parts on one chip. Specifically, it is a computer system including a microprocessor, ROM, RAM, etc. A computer program is stored in the RAM. The system LSI realizes its functions by the microprocessor operating according to the computer program.

[0111] (3) Part or all of the constituent elements constituting the above-described at least one device may also be constituted by an IC card or a single module that can be attached to and detached from the device. The IC card or the module is a computer system constituted by a microprocessor, ROM, RAM, etc. The IC card or the module may also include the above-described super-multi-functional LSI. The IC card or the module realizes its functions by the microprocessor operating according to the computer program. The IC card or the module may also have tamper-proof performance.

[0112] (4) The present disclosure may also be the method shown above. In addition, it may also be a computer program for implementing these methods by a computer, or a digital signal formed by the computer program.

[0113] In addition, the present disclosure may record the computer program or the digital signal on a computer-readable recording medium such as a floppy disk, a hard disk, a CD (Compact Disc)-ROM, a DVD, a DVD-ROM, a DVD-RAM, a BD (Blu-ray (registered trademark) Disc), a semiconductor memory, etc. In addition, it may also be a digital signal recorded on these recording media.

[0114] In addition, the present disclosure may transmit the computer program or the digital signal via an electrical communication line, a wireless or wired communication line, a network represented by the Internet, data broadcasting, etc.

[0115] In addition, it may also be implemented by an independent other computer system by transferring the program or the digital signal by recording it in a recording medium and transferring it, or by transferring the program or the digital signal via a network or the like.

[0116] Industrial Applicability

[0117] The operation method of the power system of the present disclosure can be applied to, for example, devices or systems for controlling a solar power generation system, a fuel cell system, a battery system, etc.

[0118] Reference Numeral Explanation

[0119] 10 Control device; 11 Data acquisition unit; 12 Fuel cell output calculation unit; 13 Battery output calculation unit; 20 Database; 100 Power organization; 200 Power system; 210 First controller; 211 Solar power generation device; 212 First PCS; 213 First power meter; 220 Second controller; 221 Fuel cell power generation device; 222 Second PCS; 223 Second power meter; 230 Third controller; 231 Battery device; 232 Third PCS; 233 Third power meter; 301 Load; 303 Fourth power meter; a Solar power generation system; b Fuel cell system; c Battery system; T1 Sampling period (first period); T2 Control period (second period).

Claims

1. A method for operating a power system, comprising the following steps: Planning the output of a fuel cell system during a second period after a first period to compensate for the difference between the actual value of the power demand during the first period and the actual value of the output of a solar power generation system; When the fuel cell system generates electricity according to the planned output during the second period, Charging a battery system when the sum of the output of the solar power generation system and the output of the fuel cell system is greater than the power demand; and When the fuel cell system generates electricity according to the planned output during the second period, Discharging the battery system to meet the power demand when the sum of the output of the solar power generation system and the output of the fuel cell system is less than the power demand, The first period is the period immediately preceding the second period, The second period is longer than the first period, and the planned output of the fuel cell system is fixed during the second period.

2. The method for operating a power system according to claim 1, Planning the output of the fuel cell system during the second period to be the median value of the difference between the actual value of the power demand during the first period and the actual value of the output of the solar power generation system.

3. The method for operating a power system according to claim 1, Planning the output of the fuel cell system during the second period to be the average value of the difference between the actual value of the power demand during the first period and the actual value of the output of the solar power generation system.

4. A control device for a power system, Comprising a memory and a controller, The memory stores the actual value of the power demand during the first period and the actual value of the output of the solar power generation system, The controller, Plans the output of the fuel cell system during a second period after the first period to compensate for the difference between the actual value of the power demand during the first period and the actual value of the output of the solar power generation system, When the fuel cell system generates electricity according to the planned output during the second period, Charges the battery system when the sum of the output of the solar power generation system and the output of the fuel cell system is greater than the power demand, When the fuel cell system generates electricity according to the planned output during the second period, Discharges the battery system to meet the power demand when the sum of the output of the solar power generation system and the output of the fuel cell system is less than the power demand, The first period is the period immediately preceding the second period, The second period is longer than the first period, and the planned output of the fuel cell system is fixed during the second period.

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