Operation planning device, operation planning method, and operation planning system

Abstract

The purpose of the present disclosure is to provide an operation planning device, an operation planning method, and an operation planning system with which it is possible to formulate an efficient operation plan. An operation planning device according to the present disclosure comprises: a short-period adjustable quantity calculation unit that calculates a power storage adjustable quantity and a power generation adjustable quantity; a long-period plan formulation unit that formulates a long-period plan on the basis of the power storage adjustable quantity and the power generation adjustable quantity that were calculated by the short-period adjustable quantity calculation unit, said long-period plan being an operation plan that includes power storage and power generation of a longer period than the unit of calculation of the short-period adjustable quantity calculation unit; and a short-period plan formulation unit that formulates a short-period plan on the basis of the long-period plan formulated by the long-period plan formulation unit, said short-period plan being an operation plan that includes power storage and power generation of a shorter period than the period of the long-period plan formulated by the long-period plan formulation unit.

Description

Operational planning device, operation planning method, and operation planning system

[0001] The present disclosure relates to an operation planning device, an operation planning method, and an operation planning system that formulate an electric power operation plan utilizing power storage.

[0002] The Japanese government aims to achieve carbon neutrality by 2025. To achieve this goal, the introduction of renewable energy sources is expanding, and various power storage methods are being developed accordingly.

[0003] As a means of effectively utilizing renewable energy, the construction of microgrids aiming at local production and consumption of energy has been proposed. Specifically, microgrids equipped with renewable energy power sources and power storage systems have been proposed. In such microgrids, efficient operation of the power storage system is required to effectively utilize the power generated by the renewable energy power sources.

[0004] Because power demand and the amount of power generated by renewable energy sources fluctuate seasonally, it is necessary to formulate long-term, such as annual, operation plans. Because power generation by renewable energy sources varies depending on the time of day, in order to formulate an appropriate operation plan, it is necessary to formulate the plan at a granularity of about one hour. However, when a long-term operation plan is formulated at a granularity of one hour, it becomes too detailed, making optimization difficult. Conventionally, a technology has been disclosed in which a long-term operation plan, which is a long-term operation plan, is formulated, and then short-term plans that are detailed to match this long-term plan are formulated (see, for example, Patent Document 1).

[0005] Patent No. 7359193

[0006] In the conventional technology, a short-term plan is formulated by dividing it into smaller parts to fit into a long-term plan, which may result in the short-term plan being impossible to execute or leaving too much control margin for power generation or power storage. As such, the conventional technology cannot be said to formulate an efficient operation plan.

[0007] The present disclosure has been made to solve such problems, and aims to provide an operation planning device, an operation planning method, and an operation planning system that are capable of formulating efficient operation plans.

[0008] In order to solve the above problems, the operational planning device according to the present disclosure includes a short-period adjustable amount calculation unit that calculates an adjustable amount of power storage and an adjustable amount of power generation, a long-period plan formulation unit that formulates a long-period plan, which is an operational plan that includes power storage and power generation with a period longer than the calculation unit of the short-period adjustable amount calculation unit, based on the adjustable amount of power storage and the adjustable amount of power generation calculated by the short-period adjustable amount calculation unit, and a short-period plan formulation unit that formulates a short-period plan, which is an operational plan that includes power storage and power generation with a period shorter than the period of the long-period plan formulated by the long-period plan formulation unit, based on the long-period plan formulated by the long-period plan formulation unit.

[0009] According to the present disclosure, it is possible to formulate an efficient operation plan.

[0010] The objects, features, aspects, and advantages of the present disclosure will become more apparent from the following detailed description and the accompanying drawings.

[0011] 1 is a block diagram showing an example of the configuration of an operation planning system according to embodiment 1. FIG. 2 is a block diagram showing an example of the configuration of a battery system according to embodiment 1. FIG. 3 is a block diagram showing an example of the configuration of a hydrogen power storage system according to embodiment 1. FIG. 4 is a block diagram showing an example of the configuration of a methane power storage system according to embodiment 1. FIG. 5 is a block diagram showing an example of the configuration of an operation planning device according to embodiment 1. FIG. 6 is a flowchart showing an example of the operation of the operation planning device according to embodiment 1. FIG. 7 is a graph showing an example of the prediction of a demand curve according to embodiment 1. FIG. 8 is a graph showing an example of the prediction of a demand curve according to embodiment 1. FIG. 9 is a graph showing a prediction of the amount of power generation of a renewable energy power source according to embodiment 1. FIG. 10 is a graph showing a prediction of the amount of power generation of a renewable energy power source according to embodiment 1. FIG. 11 is a graph showing a prediction of the amount of power generation of a renewable energy power source according to embodiment 1. FIG. 12 is a graph showing a prediction of the amount of power generation of a renewable energy power source according to embodiment 1. FIG. 13 is a diagram for explaining calculation of the maximum methane production amount and the maximum hydrogen production amount when methane is prioritized according to embodiment 1. FIG. 14 is a diagram for explaining calculation of the maximum methane production amount and the maximum hydrogen production amount when hydrogen is prioritized according to embodiment 1. FIG. 15 is a diagram for explaining calculation of the maximum methane production amount and the maximum hydrogen production amount when methane is prioritized according to embodiment 1. FIG. 16 is a diagram for explaining calculation of the maximum methane power generation amount and the maximum hydrogen power generation amount when methane is prioritized according to embodiment 1. FIG. 17 is a diagram for explaining the adjustable amount of power storage according to embodiment 1. FIG. 1 is a diagram for explaining an adjustable amount of power generation according to embodiment 1. FIG. 2 is a graph showing an example of formulation of a long-period plan according to embodiment 1. FIG. 3 is a diagram for explaining the operation of an operation planning device according to embodiment 2. FIG. 4 is a diagram for explaining calculation of the maximum methane production amount and the maximum hydrogen production amount when methane is prioritized according to embodiment 3. FIG. 5 is a diagram showing an example of the hardware configuration of an operation planning device according to embodiments 1 to 3. FIG. 6 is a diagram showing an example of the hardware configuration of an operation planning device according to embodiments 1 to 3.

[0012] <First Embodiment> Fig. 1 is a block diagram showing an example of the configuration of an operation planning system according to a first embodiment. As shown in Fig. 1, the operation planning system includes a microgrid 1, an external power source 2, and an operation planning device 3.

[0013] The external power source 2 includes large-scale power plants such as thermal power plants and nuclear power plants, solar power plants, wind power plants, etc. The power generated by the external power source 2 may be stored in the power storage system 5, or may be directly supplied to the consumers 9, or may be both.

[0014] The microgrid 1 includes a renewable energy power source 4 , a power storage system 5 , and a consumer 9 .

[0015] The renewable energy power source 4 includes a solar power plant, a wind power plant, etc. The power generated by the renewable energy power source 4 is stored in the power storage system 5 according to the plan formulated by the operation planning device 3. Note that the power generated by the renewable energy power source 4 may be supplied directly to consumers 9 as needed.

[0016] The power storage system 5 includes a storage battery system 6, a hydrogen power storage system 7, and a methane power storage system 8. The power storage system 5 supplies stored power to consumers 9 in accordance with the plan formulated by the operation planning device 3.

[0017] 2 is a block diagram showing an example of the configuration of the storage battery system 6. The storage battery system 6 includes a PCS 10 (power conditioner) and a storage battery 11.

[0018] The PCS 10 converts charging power to the storage battery 11 from AC to DC, and converts discharging power from the storage battery 11 from DC to AC. The PCS 10 also controls output when discharging from the storage battery 11. Note that the power input to the storage battery system 6 (charging power to the storage battery 11) may be power generated by the renewable energy power source 4 or power supplied from the external power source 2. The storage battery system 6 is suitable for short-term operation because it incurs power loss due to charging and discharging and power loss due to natural discharge.

[0019] 3 is a block diagram showing an example of the configuration of the hydrogen-powered storage system 7. The hydrogen-powered storage system 7 includes a hydrogen converter 12, a hydrogen storage facility 13, and a fuel cell 14.

[0020] The hydrogen converter 12 converts water (H ２Hydrogen (H ２ The hydrogen generated by the hydrogen converter 12 is stored in a hydrogen storage facility 13. Examples of the hydrogen storage facility 13 include a tank or a hydrogen storage alloy. The fuel cell 14 generates electricity by reacting oxygen with the hydrogen stored in the hydrogen storage facility 13. The hydrogen power storage system 7 is suitable for long-term operation because, although power loss occurs during hydrogen generation and power generation, loss during storage is small.

[0021] 4 is a block diagram showing an example of the configuration of the methane power storage system 8. The methane power storage system 8 includes a methane reactor 15, a methane storage facility 16, a reformer 17, and a fuel cell 18.

[0022] The methane reactor 15 uses the input power to produce water (H ２ O) and carbon dioxide (CO ２ ) to produce methane (CH ４ At this time, the methane reactor 15 may obtain carbon dioxide from the air by carbon capture or the like. The methane produced by the methane reactor 15 is stored in a methane storage facility 16. The methane storage facility 16 may be, for example, a tank. The reformer 17 converts the methane stored in the methane storage facility 16 into hydrogen (H ２ For example, the reformer 17 reacts water with methane stored in the methane storage facility 16 to produce hydrogen. The fuel cell 18 generates electricity by reacting oxygen with the hydrogen produced in the reformer 17. The methane power storage system 8 is suited to long-term operation because, although power loss occurs during methane production, hydrogen production, and power generation, loss during storage is small.

[0023] The methane storage facility 16 may store biomethane produced externally and may supply the stored methane to an external source to meet gas demand. However, in this disclosure, the methane storage facility 16 will be described as storing only the methane produced in the methane reactor 15 and not supplying methane to an external source.

[0024] 5 is a block diagram showing an example of the configuration of the operation planning device 3. The operation planning device 3 is connected to the microgrid 1 as shown in FIG. 1 , and acquires necessary information from the renewable energy power source 4, the power storage system 5, and the consumer 9. The operation planning device 3 also provides the formulated plan to the renewable energy power source 4 and the power storage system 5.

[0025] 5 , the operational planning device 3 includes a short-period adjustable amount calculation unit 19, a long-period plan formulation unit 24, and a short-period plan formulation unit 25. In the present disclosure, the operational planning device 3 is characterized by including the short-period adjustable amount calculation unit 19.

[0026] The short-term adjustable amount calculation unit 19 calculates the short-term (monthly or daily) adjustable amount of power storage and the adjustable amount of power generation. Specifically, the short-term adjustable amount calculation unit 19 calculates the adjustable amount of power storage and the adjustable amount of power generation at a granularity equal to or smaller than the granularity (monthly or daily) of the long-term plan formulated by the long-term plan formulation unit 24 on an annual basis.

[0027] The short-period adjustable amount calculation unit 19 includes a prediction unit 20 , a maximum gas production amount calculation unit 21 , a maximum gas-generated power generation amount calculation unit 22 , and an adjustable amount calculation unit 23 .

[0028] The prediction unit 20 predicts the power demand curve and the renewable energy power generation amount, which is the amount of power generated by renewable energy.

[0029] The maximum gas production amount calculation unit 21 calculates the maximum gas production amount, which is the maximum amount of gas production related to the power storage, based on the demand curve predicted by the prediction unit 20 and the amount of power generated by renewable energy.

[0030] The maximum gas power generation amount calculation unit 22 calculates the maximum gas power generation amount, which is the maximum amount of power generation using gas related to power storage, based on the demand curve predicted by the prediction unit 20 and the amount of renewable energy power generation.

[0031] The adjustable amount calculation unit 23 calculates the adjustable amount of power storage based on the maximum gas generation amount calculated by the maximum gas generation amount calculation unit 21, and calculates the adjustable amount of power generation based on the maximum gas generation amount calculated by the maximum gas generation amount calculation unit 22.

[0032] The long-term plan formulation unit 24 formulates a long-term plan, which is an operation plan including power storage and power generation on an annual basis, based on the power storage adjustable amount and power generation adjustable amount calculated by the short-term adjustable amount calculation unit 19.

[0033] The short-term plan formulation unit 25 formulates a short-term plan, which is an operation plan including power storage and power generation on a monthly or daily basis, based on the long-term plan formulated by the long-term plan formulation unit 24 .

[0034] The operation planning device 3 can also be applied to a device constructed as a system by appropriately combining servers and the like provided outside the operation planning device 3. In this case, each function or each component of the operation planning device 3 is distributed and arranged among the functions that construct the system.

[0035] 6 is a flowchart showing an example of the operation of the operation planning device 3, and mainly shows the operation of the short-period adjustable amount calculation unit 19. Note that the following will describe a case where the hydrogen power storage system 7 and the methane power storage system 8 of the power storage system 5 are used.

[0036] In step S1, the short-cycle adjustable amount calculation unit 19 selects a period of the short-cycle plan for which the adjustable amount has not been calculated. The adjustable amount includes the adjustable amount of power storage and the adjustable amount of power generation. In this disclosure, the short-cycle period is described as being in units of months. That is, the short-cycle adjustable amount calculation unit 19 selects a month for which the adjustable amount has not been calculated.

[0037] In step S2, the prediction unit 20 predicts a power demand curve and a renewable energy power generation amount, which is the amount of power generated by renewable energy. Specifically, the operation planning device 3 externally acquires information on past power demand and the amount of power generated in the past by the renewable energy power source 4. The prediction unit 20 then predicts a power demand curve based on the information on the past power demand, and predicts the renewable energy power generation amount based on the amount of power generated in the past by the renewable energy power source 4.

[0038] The information regarding past power demand and the amount of power generated by the renewable energy power source 4 in the past may be information for the past year or for the past several years. This information is stored, for example, in an external server. The prediction unit 20 may also use annual climate forecasts or annual humidity forecasts published by the Japan Meteorological Agency as supplementary information. The functions of the prediction unit 20 may be possessed by an external device. In this case, the operation planning device 3 acquires the power demand curve predicted by the external device and the renewable energy power generation amount, which is the amount of power generated by the renewable energy power source 4.

[0039] 7 and 8 show examples of demand curves for April predicted by the prediction unit 20. In FIGS. 7 and 8, the horizontal axis represents time (hourly granularity), and the vertical axis represents the amount of demanded energy. FIG. 7 shows a one-day demand curve obtained by averaging the demand curves for weekdays (22 days). FIG. 8 shows a one-day demand curve obtained by averaging the demand curves for holidays (8 days).

[0040] Figures 9 to 12 show examples of renewable energy power generation amounts for April predicted by the prediction unit 20. In Figures 9 to 12, the horizontal axis represents time (hourly granularity), and the vertical axis represents power generation amount. Figure 9 shows the daily renewable energy power generation amount obtained by averaging the renewable energy power generation amounts on sunny days (13 days). Figure 10 shows the daily renewable energy power generation amount obtained by averaging the renewable energy power generation amounts on sunny days (9 days). Figure 11 shows the daily renewable energy power generation amount obtained by averaging the renewable energy power generation amounts on cloudy days (5 days). Figure 12 shows the daily renewable energy power generation amount obtained by averaging the renewable energy power generation amounts on rainy days (3 days).

[0041] Returning to Figure 6, in step S3, the maximum gas production amount calculation unit 21 calculates, by simulation, the maximum gas production amount, which is the maximum amount of gas production related to power storage, based on the demand curve predicted by the prediction unit 20 and the amount of renewable energy power generation.

[0042] Specifically, the maximum gas production amount calculation unit 21 calculates the maximum methane production amount and maximum hydrogen production amount generated when methane is prioritized, and the maximum methane production amount and maximum hydrogen production amount generated when hydrogen is prioritized. Here, "methane priority" refers to operating the methane reactor 15 (FIG. 4) with priority over the hydrogen converter 12 (FIG. 3). Also, "hydrogen priority" refers to operating the hydrogen converter 12 (FIG. 3) with priority over the methane reactor 15 (FIG. 4).

[0043] 13 is a diagram for explaining the calculation of the maximum methane production amount and the maximum hydrogen production amount when methane is prioritized. In FIG. 13, the horizontal axis represents time (hourly intervals), and the vertical axis represents the amount of power demand or the amount of power generation. Note that the hydrogen converter 12 and the methane reactor 15 are assumed to be operating at rated capacity.

[0044] In Figure 13, the average demand curve for weekdays in April (Figure 7) is superimposed on the average renewable energy power generation amount on a sunny day in April (Figure 9). The portion where the renewable energy power generation amount exceeds the power demand amount corresponds to the portion where the renewable energy power source 4 generates excess power (surplus power). The maximum gas production amount calculation unit 21 calculates the maximum methane production amount and maximum hydrogen production amount that can be produced using this surplus power.

[0045] Specifically, when the surplus power shown in Figure 13 reaches the rated power required for methane production, the methane reactor 15 starts rated operation to produce methane. Then, when the rated power required for hydrogen production further reaches the rated power required for hydrogen production, the hydrogen converter 12 starts rated operation to produce hydrogen. Thereafter, when the power falls below the rated power required for hydrogen production, the hydrogen converter 12 stops rated operation and terminates hydrogen production, and then when the power falls below the rated power required for methane production, the methane reactor 15 stops rated operation and terminates methane production. In this way, the methane reactor 15 produces methane with the amount of power for methane production shown in Figure 13, and the hydrogen converter 12 produces hydrogen with the amount of power for hydrogen production shown in Figure 13.

[0046] The maximum gas production amount calculation unit 21 calculates the amount of methane produced by the methane reactor 15 (maximum methane production amount) based on the operation time of the methane reactor 15 and the amount of methane production that the methane reactor 15 can produce per unit time. The maximum gas production amount calculation unit 21 also calculates the amount of hydrogen produced by the hydrogen converter 12 (maximum hydrogen production amount) based on the operation time of the hydrogen converter 12 and the amount of hydrogen production that the hydrogen converter 12 can produce per unit time.

[0047] Although the above describes the case where a "weekday" is combined with "clear," the maximum gas production rate calculation unit 21 also calculates the maximum methane production rate and the maximum hydrogen production rate in the methane-prioritized state and the hydrogen-prioritized state for each combination of a "weekday" with "clear ( FIG. 10 )," "cloudy ( FIG. 11 )," and "rainy ( FIG. 12 )." Furthermore, the maximum gas production rate calculation unit 21 also calculates the maximum methane production rate and the maximum hydrogen production rate in the methane-prioritized state and the hydrogen-prioritized state for each combination of a "holiday ( FIG. 8 )" with "clear ( FIG. 9 )," "clear ( FIG. 10 )," "cloudy ( FIG. 11 )," and "rainy ( FIG. 12 )."

[0048] 14 is a diagram for explaining the calculation of the maximum methane production amount and the maximum hydrogen production amount when hydrogen is prioritized. In FIG. 14, the calculation is the same as in FIG. 13 except that hydrogen is prioritized.

[0049] Specifically, when the surplus power shown in Figure 14 reaches the rated power required for hydrogen production, the hydrogen converter 12 starts rated operation to produce hydrogen. Then, when the rated power required for methane production is reached, the methane reactor 15 starts rated operation to produce methane. Thereafter, when the power falls below the rated power required for methane production, the methane reactor 15 stops rated operation and terminates methane production, and when the power falls below the rated power required for hydrogen production, the hydrogen converter 12 stops rated operation and terminates hydrogen production. In this way, the hydrogen converter 12 produces hydrogen with the amount of power for hydrogen production shown in Figure 14, and the methane reactor 15 produces methane with the amount of power for methane production shown in Figure 14.

[0050] The maximum gas production amount calculation unit 21 calculates the maximum hydrogen production amount and the maximum methane production amount when hydrogen is prioritized in the same manner as when methane is prioritized.

[0051] Returning to Figure 6, in step S4, the maximum gas power generation calculation unit 22 calculates, through simulation, the maximum gas power generation amount, which is the maximum amount of power generation using gas related to power storage, based on the demand curve and renewable energy power generation amount predicted by the prediction unit 20.

[0052] Specifically, the maximum gas power generation amount calculation unit 22 calculates the maximum methane power generation amount and maximum hydrogen power generation amount generated when methane is prioritized, and the maximum methane power generation amount and maximum hydrogen power generation amount generated when hydrogen is prioritized.

[0053] Figure 15 is a diagram for explaining the calculation of the maximum methane power generation yield and the maximum hydrogen power generation yield when methane is prioritized. In Figure 15, the horizontal axis represents time (hourly intervals), and the vertical axis represents the amount of power demand or the amount of power generation. Note that the hydrogen converter 12 and the methane reactor 15 are assumed to be operating at rated capacity.

[0054] 15 , as with FIGS. 13 and 14 , the average weekday demand curve in April ( FIG. 7 ) is superimposed on the average renewable energy power generation amount on a clear day in April ( FIG. 9 ). The portion where the renewable energy power generation amount is less than the power demand corresponds to the portion where the amount of power generation from the renewable energy power source 4 is insufficient (power shortage). To compensate for this power shortage, the maximum gas power generation amount calculation unit 22 calculates the maximum methane power generation amount and the maximum hydrogen power generation amount that can be generated using the methane stored in the methane storage facility 16 ( FIG. 4 ) and the hydrogen stored in the hydrogen storage facility 13 ( FIG. 3 ). Note that the amounts of methane stored in the methane storage facility 16 and the hydrogen stored in the hydrogen storage facility 13 are not taken into consideration here. In other words, it is assumed that the amount of methane required for power generation is stored in the methane storage facility 16, and the amount of hydrogen required for power generation is stored in the hydrogen storage facility 13.

[0055] Specifically, during the portion of the power shortage shown in Fig. 15, the reformer 17 and fuel cell 18 operate at rated speed to generate power using methane. The maximum gas power generation calculation unit 22 calculates the amount of power generated in this manner as the maximum methane power generation amount.

[0056] Next, during the portion of the power shortage shown in Fig. 15, the fuel cell 14 generates electricity using hydrogen at rated operation. The maximum gas power generation calculation unit 22 calculates the amount of power generated in this manner as the maximum hydrogen power generation amount.

[0057] 15, the calculation of the maximum methane power generation yield and the maximum hydrogen power generation yield when methane is prioritized is described, but the same applies to the calculation of the maximum methane power generation yield and the maximum hydrogen power generation yield when hydrogen is prioritized. That is, the maximum gas power generation yield calculation unit 22 calculates the maximum methane power generation yield and the maximum hydrogen power generation yield when methane is prioritized and when hydrogen is prioritized for each combination of "weekday (FIG. 7)" and "holiday (FIG. 8)" with each combination of "fine (FIG. 9)," "fine (FIG. 10)," "cloudy (FIG. 11)," and "rainy (FIG. 12)."

[0058] 6 , in step S5, the adjustable amount calculation unit 23 calculates the adjustable amount of power storage based on the maximum gas production rates (the maximum methane production rate and the maximum hydrogen production rate when methane is prioritized and the maximum hydrogen production rate when hydrogen is prioritized) calculated by the maximum gas production rate calculation unit 21. The adjustable amount calculation unit 23 also calculates the adjustable amount of power generation based on the maximum gas power generation rates (the maximum methane power generation rate and the maximum hydrogen power generation rate when methane is prioritized and the maximum hydrogen power generation rate when hydrogen is prioritized) calculated by the maximum gas power generation rate calculation unit 22.

[0059] Specifically, the adjustable amount calculation unit 23 calculates the maximum methane production amount and the maximum hydrogen production amount for an average day on a weekday and the maximum methane production amount and the maximum hydrogen production amount for an average day on a holiday by summing up each combination of the demand curve (weekday, holiday) and the renewable energy power generation amount (clear, sunny, cloudy, rainy) for the maximum methane production amount and the maximum hydrogen production amount during the methane-priority period and the hydrogen-priority period calculated by the maximum gas production amount calculation unit 21. The adjustable amount calculation unit 23 then calculates the maximum methane production amount and the maximum hydrogen production amount for an average day on a weekday for one month (e.g., 22 days in April) and the maximum methane production amount and the maximum hydrogen production amount for an average day on a holiday for one month (e.g., 8 days in April).

[0060] The method for calculating the maximum methane production amount and the maximum hydrogen production amount for one month is not limited to the above. For example, in Figures 7 to 12, the combination of "weekday" and "clear" has approximately 9.54 days, which can be converted to an integer to 10 days, and the average daily maximum methane production amount and maximum hydrogen production amount for the combination of "weekday" and "clear" for 10 days can be calculated. The same calculations can be performed for other combinations, and the maximum methane production amount and maximum hydrogen production amount for each combination can be summed to calculate the maximum methane production amount and maximum hydrogen production amount for one month. The maximum methane production amount and maximum hydrogen production amount calculated in this way for one month correspond to the adjustable amount of power storage.

[0061] Although the method for calculating the adjustable amount of power storage has been described above, the same applies to the method for calculating the adjustable amount of power generation.

[0062] FIG. 16 is a diagram illustrating the adjustable amount of power storage. In FIG. 16, the vertical axis indicates the range in which methane can be produced (methane producible range), and the horizontal axis indicates the range in which hydrogen can be produced (hydrogen producible range). The maximum value of the "methane producible range" corresponds to the maximum amount of methane produced when methane is prioritized. The maximum value of the "hydrogen producible range" corresponds to the maximum amount of hydrogen produced when hydrogen is prioritized. Note that the line connecting the maximum value of the "methane producible range" and the maximum value of the "hydrogen producible range" is a linear approximation of the relationship between these two points, but it is also possible to connect them in a stepped or nonlinear manner. The methane producible range, the hydrogen producible range, and the range enclosed by the approximated straight lines correspond to the adjustable amount of power storage.

[0063] FIG. 17 is a diagram illustrating the adjustable amount of power generation. In FIG. 17, the vertical axis indicates the range in which power generation is possible using methane (methane power generation range), and the horizontal axis indicates the range in which power generation is possible using hydrogen (hydrogen power generation range). The maximum value of the "methane power generation range" corresponds to the maximum amount of methane power generation when methane is prioritized. The maximum value of the "hydrogen power generation range" corresponds to the maximum amount of hydrogen power generation when hydrogen is prioritized. Note that the line connecting the maximum value of the "methane power generation range" and the maximum value of the "hydrogen power generation range" is a linear approximation of the relationship between these two points, but it is also possible to connect them in a stepped or nonlinear manner. The methane power generation range, hydrogen power generation range, and the range enclosed by the approximated straight lines correspond to the adjustable amount of power generation.

[0064] 6, in step S6, the short-period adjustable amount calculation unit 19 determines whether the adjustable amount for the entire period has been calculated. If the adjustable amount for the entire period has been calculated, the operation in FIG. 6 ends. On the other hand, if the adjustable amount for the entire period has not been calculated, the process returns to step S1.

[0065] FIG. 18 is a graph showing an example of the formulation of a long-period plan. The long-period plan formulation unit 24 formulates a long-period plan, which is an operation plan including annual power storage and power generation, based on the power storage adjustable amount and power generation adjustable amount calculated by the short-period adjustable amount calculation unit 19. Specifically, the long-period plan formulation unit 24 calculates and optimizes costs in order to efficiently generate methane and hydrogen and efficiently generate power using the methane and hydrogen. As shown in FIG. 18 , the granularity of the long-period plan (one month) is consistent with the monthly adjustable amount calculated by the short-period adjustable amount calculation unit 19. While an example is shown in which the calculation unit of the adjustable amount calculated by the short-period adjustable amount calculation unit 19 is consistent with the granularity of the long-period plan, the calculation unit of the adjustable amount calculated by the short-period adjustable amount calculation unit 19 may be any period equal to or smaller than the granularity of the long-period plan.

[0066] Although FIG. 18 shows a plan for carrying out either generation or power generation for each month, it is also possible to have a plan for carrying out both generation and power generation in the same month.

[0067] The short-term plan formulation unit 25 formulates a short-term plan, which is an operation plan including power storage and power generation on a monthly or daily basis, based on the long-term plan formulated by the long-term plan formulation unit 24. Specifically, when the long-term plan formulation unit 24 formulates the long-term plan shown in Fig. 18, the short-term plan formulation unit 25 formulates a short-term plan on a daily basis to match the plan for each month. In this case, the short-term plan formulation unit 25 may formulate a plan at an hourly granularity.

[0068] For the above reasons, the operation planning device according to the first embodiment calculates the adjustable amount of power storage and the adjustable amount of power generation in the short period before formulating a long-period plan. This makes it possible to avoid the short-period plan becoming infeasible or to avoid leaving too much margin for control related to power generation or power storage in the short-period plan. In other words, according to the first embodiment, it is possible to formulate an efficient operation plan.

[0069] <Second Embodiment> In the first embodiment, a case has been described in which methane and hydrogen are produced using electric power generated by the renewable energy power source 4 when the maximum gas production amount calculation unit 21 calculates the maximum gas production amount by simulation. In the second embodiment, a case will be described in which methane and hydrogen are produced using electric power purchased from an external source in addition to electric power generated by the renewable energy power source 4. Here, electric power purchased from an external source includes, for example, electric power generated by the external power source 2. The configuration and basic operation are the same as those in the first embodiment.

[0070] Fig. 19 is a diagram for explaining the operation of the operation planning device 3 according to the second embodiment. In Fig. 19, the vertical axis indicates the amount of methane produced, and the horizontal axis indicates the amount of hydrogen produced. The range of "gas generation using surplus power" corresponds to the adjustable amount of power storage shown in Fig. 16. The range of "gas generation using purchased power" indicates the amount of methane and hydrogen produced using power purchased from an external source.

[0071] In Figure 19, a case where methane and hydrogen are produced under the conditions indicated by point A will be described. Methane can be produced using surplus electricity. On the other hand, hydrogen can be produced using surplus electricity to produce hydrogen amount A1, but hydrogen amount A2 must be produced using electricity purchased from an external source. The maximum gas production amount calculation unit 21 calculates the hydrogen amount A2 and the purchase price of electricity required to produce hydrogen amount A2. The maximum gas production amount calculation unit 21 calculates the purchase price of electricity based on a unit price set in advance for each month or the monthly average of the predicted unit price of electricity for each day. The purchase price of electricity may also be a unit price.

[0072] The long-term plan formulation unit 24 performs optimization calculations for the long-term plan assuming that, if there is surplus electricity generated by the renewable energy power source 4, that amount can be used free of charge to generate gas (methane, hydrogen), but if the surplus electricity cannot be used, a separate purchase price is required for gas generation. Specifically, when formulating the long-term plan, the amount of gas generated using surplus electricity and the amount of gas generated using purchased electricity (received electricity) are defined as separate variables (see equations (1) and (2) below). Then, for gas generation using purchased electricity, the purchase price is added when evaluating the cost.

[0073] G(4, source)min≦G(4, source)≦G(4, source)max (1) G(4, receiver)min≦G(4, receiver)≦G(4, receiver)max (2) Formula (1) shows the range constraints on the amount of gas generated when using surplus power in the source area (microgrid 1) in April. For example, G(source)min is zero.

[0074] Equation (2) shows the range constraint of the gas production amount when using the purchased electricity in April. For example, G(received)min is zero.

[0075] The evaluation function in the optimization calculation of a long-term plan can be a weighted sum of various costs required for system operation, but it can be realized by adding the following terms to this weighted sum:

[0076] Evaluation function: F = Xa + Xb + ... + C(4) x G(4, receiving) + C(5) x G(5, receiving) + ... + C(3) x G(3, receiving) In the above evaluation function, C(4) represents the unit price of electricity required to generate gas using the electricity purchased in April. Also, "Xa" and "Xb" represent various costs required for system operation.

[0077] As described above, according to the second embodiment, it is possible to formulate a long-term plan that includes the case where gas is generated using electricity purchased from outside.

[0078] <Embodiment 3> In embodiment 1, a case has been described in which the hydrogen converter 12 and fuel cell 14 in the hydrogen power storage system 7, and the methane reactor 15, reformer 17, and fuel cell 18 in the methane power storage system 8 are operated at rated power. In embodiment 3, the hydrogen converter 12 and fuel cell 14 in the hydrogen power storage system 7, and the methane reactor 15, reformer 17, and fuel cell 18 in the methane power storage system 8 are capable of not only rated output at rated operation, but also intermediate output. Other configurations and basic operations are the same as in embodiment 1.

[0079] 20 is a diagram for explaining the calculation of the maximum methane production amount and the maximum hydrogen production amount when methane is prioritized according to the third embodiment. In FIG. 20, the areas (four locations) surrounded by dashed lines are where methane and hydrogen are produced by intermediate power output. The rest is the same as in FIG. 13.

[0080] 20 shows the maximum methane production amount and maximum hydrogen production amount when methane is prioritized, but the same applies to the maximum methane production amount and maximum hydrogen production amount when hydrogen is prioritized. Furthermore, the maximum methane power generation amount and maximum hydrogen power generation amount when methane is prioritized and when hydrogen is prioritized are also generated at intermediate output.

[0081] According to the third embodiment, surplus electricity can be used without waste to generate gas (methane, hydrogen), and electricity can be generated efficiently.

[0082] Fourth Embodiment In the first to third embodiments, a case has been described in which a plan is formulated using the hydrogen power storage system 7 and the methane power storage system 8. In a fourth embodiment, a case will be described in which a plan is formulated using the storage battery system 6 in addition to the hydrogen power storage system 7 and the methane power storage system 8.

[0083] The battery system 6 may be a NAS battery or a redox flow battery with a large hourly capacity, or a lithium ion battery (LiB) with a small hourly capacity. Depending on the characteristics and installed capacity, the battery system 6 may be used only for short-term plans or may be used for long-term plans.

[0084] When using the storage battery system 6, for example, the surplus power shown in Fig. 13 may be first charged to the storage battery system 6, and then the surplus power may be used to produce methane and hydrogen. Furthermore, the power charged to the storage battery system 6 may be discharged during a time period when the amount of power demand is greater than the amount of power generated by renewable energy.

[0085] <Hardware Configuration> The functions of the prediction unit 20, maximum gas generation rate calculation unit 21, maximum gas-fired power generation rate calculation unit 22, adjustable amount calculation unit 23, long-term plan formulation unit 24, and short-term plan formulation unit 25 in the operation planning device 3 are realized by processing circuits. That is, the operation planning device 3 includes processing circuits for predicting the power demand curve and the renewable energy power generation amount, calculating the maximum gas generation rate, calculating the adjustable amount of power storage and the adjustable amount of power generation, formulating long-term plans that are operation plans including power storage and power generation on an annual basis, and formulating short-term plans that are operation plans including power storage and power generation on a monthly or daily basis. The processing circuit may be dedicated hardware or a processor (also referred to as a CPU, central processing unit, processing device, arithmetic unit, microprocessor, microcomputer, or DSP (Digital Signal Processor)) that executes a program stored in memory.

[0086] When the processing circuit is dedicated hardware, the processing circuit 26 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof, as shown in Fig. 21. The functions of the prediction unit 20, the maximum gas production amount calculation unit 21, the maximum gas-powered electricity generation amount calculation unit 22, the adjustable amount calculation unit 23, the long-term plan formulation unit 24, and the short-term plan formulation unit 25 may be realized individually by the processing circuit 26, or all of the functions may be realized together by a single processing circuit 26.

[0087] When the processing circuit 26 is the processor 27 shown in FIG. 22 , the functions of the prediction unit 20, the maximum gas generation rate calculation unit 21, the maximum gas-fired power generation rate calculation unit 22, the adjustable amount calculation unit 23, the long-term plan formulation unit 24, and the short-term plan formulation unit 25 are realized by software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in the memory 28. The processor 27 implements each function by reading and executing the program recorded in the memory 28. That is, the operation planning device 3 includes the memory 28 for storing programs that result in the execution of the steps of predicting the power demand curve and the renewable energy power generation amount, calculating the maximum gas generation rate, calculating the adjustable amount of power storage and the adjustable amount of power generation, formulating a long-term plan that is an operation plan including power storage and power generation on an annual basis, and formulating a short-term plan that is an operation plan including power storage and power generation on a monthly or daily basis. These programs can also be said to cause a computer to execute the procedures or methods of the prediction unit 20, the maximum gas production amount calculation unit 21, the maximum gas-generated power generation amount calculation unit 22, the adjustable amount calculation unit 23, the long-term plan formulation unit 24, and the short-term plan formulation unit 25. Here, the memory may be, for example, a non-volatile or volatile semiconductor memory such as a random access memory (RAM), a read-only memory (ROM), a flash memory, an erasable programmable read-only memory (EPROM), or an electrically erasable programmable read-only memory (EEPROM), a magnetic disk, a flexible disk, an optical disk, a compact disk, a digital versatile disk (DVD), or any storage medium that will be used in the future.

[0088] In addition, with regard to each function of the prediction unit 20, maximum gas generation amount calculation unit 21, maximum gas power generation amount calculation unit 22, adjustable amount calculation unit 23, long-term plan formulation unit 24, and short-term plan formulation unit 25, some functions may be realized by dedicated hardware, and other functions may be realized by software or firmware.

[0089] Thus, the processing circuitry can implement each of the above-described functions through hardware, software, firmware, or a combination thereof.

[0090] Within the scope of the present disclosure, the embodiments can be freely combined, modified, or omitted as appropriate.

[0091] Although the present disclosure has been described in detail, the above description is illustrative in all respects and is not restrictive. It is understood that countless variations not illustrated can be envisioned.

[0092] <Supplementary Notes> Various aspects of the present disclosure will be summarized below as supplementary notes.

[0093] (Supplementary Note 1) An operation planning device comprising: a short-cycle adjustable amount calculation unit that calculates an adjustable amount of power storage and an adjustable amount of power generation; a long-cycle plan formulation unit that formulates a long-cycle plan, which is an operation plan including power storage and power generation in a cycle longer than a calculation unit of the short-cycle adjustable amount calculation unit, based on the adjustable amount of power storage and the adjustable amount of power generation calculated by the short-cycle adjustable amount calculation unit; and a short-cycle plan formulation unit that formulates a short-cycle plan, which is an operation plan including power storage and power generation in a cycle shorter than a cycle of the long-cycle plan formulated by the long-cycle plan formulation unit, based on the long-cycle plan formulated by the long-cycle plan formulation unit.

[0094] (Supplementary Note 2) An operation planning device comprising: a short-term adjustable amount calculation unit that calculates an adjustable amount of power storage and an adjustable amount of power generation on a monthly or daily basis; a long-term plan formulation unit that formulates a long-term plan that is an operation plan including power storage and power generation on a yearly basis, based on the adjustable amount of power storage and the adjustable amount of power generation calculated by the short-term adjustable amount calculation unit; and a short-term plan formulation unit that formulates a short-term plan that is an operation plan including power storage and power generation on a monthly or daily basis, based on the long-term plan formulated by the long-term plan formulation unit.

[0095] (Supplementary Note 3) The operation planning device according to Supplementary Note 1 or 2, wherein the short-term adjustable amount calculation unit includes: a prediction unit that predicts an electricity demand curve and a renewable energy power generation amount, which is the amount of power generated by renewable energy; a maximum gas generation amount calculation unit that calculates a maximum gas generation amount, which is the maximum amount of gas generation related to electricity storage, based on the demand curve and the renewable energy power generation amount predicted by the prediction unit; a maximum gas power generation amount calculation unit that calculates a maximum gas power generation amount, which is the maximum amount of power generation using gas related to the electricity storage, based on the demand curve and the renewable energy power generation amount predicted by the prediction unit; and an adjustable amount calculation unit that calculates the electricity storage adjustable amount based on the maximum gas generation amount calculated by the maximum gas generation amount calculation unit, and calculates the power generation adjustable amount based on the maximum gas power generation amount calculated by the maximum gas power generation amount calculation unit.

[0096] (Supplementary Note 4) The operation planning device according to Supplementary Note 3, wherein the demand curve includes a demand curve for each of weekdays and holidays.

[0097] (Supplementary Note 5) The operation planning device according to Supplementary Note 3 or 4, wherein the renewable energy power generation amount includes a power generation amount by weather.

[0098] (Supplementary Note 6) The operation planning device according to any one of Supplementary Notes 3 to 5, wherein the maximum gas production amount calculation unit calculates the maximum gas production amount using the renewable energy during a period in which the amount of power generation from the renewable energy exceeds the demand curve.

[0099] (Supplementary Note 7) The operation planning device according to any one of Supplementary Notes 3 to 6, wherein the maximum gas-fired power generation amount calculation unit calculates the maximum gas-fired power generation amount during a period in which the amount of renewable energy power generation does not exceed the demand curve.

[0100] (Supplementary Note 8) The operation planning device according to any one of Supplementary Notes 3 to 7, wherein the gas includes methane and hydrogen, the maximum gas production amount includes a maximum methane production amount and a maximum hydrogen production amount, and the maximum gas power generation amount includes a maximum methane power generation amount and a maximum hydrogen power generation amount.

[0101] (Supplementary Note 9) The operation planning device according to Supplementary Note 8, wherein the maximum gas production amount calculation unit calculates the maximum methane production amount and the maximum hydrogen production amount when the methane is preferentially produced, and the maximum methane production amount and the maximum hydrogen production amount when the hydrogen is preferentially produced.

[0102] (Supplementary Note 10) The operation planning device according to Supplementary Note 8 or 9, wherein the maximum gas power generation yield calculation unit calculates the maximum methane power generation yield and the maximum hydrogen power generation yield when power generation is prioritized over methane, and the maximum methane power generation yield and the maximum hydrogen power generation yield when power generation is prioritized over hydrogen.

[0103] (Supplementary Note 11) The operation planning device according to Supplementary Note 6, wherein the maximum gas production amount calculation unit calculates a purchase price of electricity required to produce the gas and an amount of the gas produced equivalent to the purchase price during a period in which the amount of electricity generated from renewable energy does not exceed the demand curve.

[0104] (Supplementary Note 12) The operation planning device according to Supplementary Note 6, wherein the maximum gas production amount calculation unit calculates the maximum gas production amount based on a rated output and an intermediate output of the device that produces the gas.

[0105] (Supplementary Note 13) The operation planning device according to Supplementary Note 7, wherein the maximum gas-fired power generation amount calculation unit calculates the maximum gas-fired power generation amount based on a rated output and an intermediate output of the device that generates power from the gas.

[0106] (Supplementary Note 14) The operation planning device according to any one of Supplementary Notes 3 to 13, wherein the maximum gas production amount calculation unit calculates the maximum gas production amount taking into account a storage battery.

[0107] (Supplementary Note 15) The operation planning device according to any one of Supplementary Notes 3 to 14, wherein the maximum gas-fired power generation amount calculation unit calculates the maximum gas-fired power generation amount taking into account a storage battery.

[0108] (Supplementary Note 16) An operational planning method comprising: calculating an adjustable amount of power storage and an adjustable amount of power generation on a monthly or daily basis; formulating a long-term plan, which is an operational plan including power storage and power generation on a yearly basis, based on the calculated adjustable amount of power storage and the adjustable amount of power generation; and formulating a short-term plan, which is an operational plan including power storage and power generation on a monthly or daily basis, based on the formulated long-term plan.

[0109] (Supplementary Note 17) An operational planning system that formulates an operational plan regarding power storage and power generation in a power storage system, comprising: a short-term adjustable amount calculation unit that calculates a monthly or daily adjustable amount of power storage and an adjustable amount of power generation; a long-term plan formulation unit that formulates a long-term plan that is an operational plan including power storage and power generation on a yearly basis, based on the adjustable amount of power storage and the adjustable amount of power generation calculated by the short-term adjustable amount calculation unit; and a short-term plan formulation unit that formulates a short-term plan that is an operational plan including power storage and power generation on a monthly or daily basis, based on the long-term plan formulated by the long-term plan formulation unit.

[0110] 1 Microgrid, 2 External power source, 3 Operation planning device, 4 Renewable energy power source, 5 Power storage system, 6 Battery system, 7 Hydrogen power storage system, 8 Methane power storage system, 9 Consumer, 10 PCS, 11 Battery, 12 Hydrogen converter, 13 Hydrogen storage equipment, 14 Fuel cell, 15 Methane reactor, 16 Methane storage equipment, 17 Reformer, 18 Fuel cell, 19 Short-term adjustment possible amount calculation unit, 20 Prediction unit, 21 Maximum gas production amount calculation unit, 22 Maximum gas power generation amount calculation unit, 23 Adjustable amount calculation unit, 24 Long-term planning unit, 25 Short-term planning unit, 26 Processing circuit, 27 Processor, 28 Memory.

Claims

1. An operation planning device comprising: a short-period adjustable amount calculation unit that calculates an adjustable amount of power storage and an adjustable amount of power generation; a long-period plan formulation unit that formulates a long-period plan, which is an operation plan including power storage and power generation with a period longer than a calculation unit of the short-period adjustable amount calculation unit, based on the adjustable amount of power storage and the adjustable amount of power generation calculated by the short-period adjustable amount calculation unit; and a short-period plan formulation unit that formulates a short-period plan, which is an operation plan including power storage and power generation with a period shorter than the period of the long-period plan formulated by the long-period plan formulation unit, based on the long-period plan formulated by the long-period plan formulation unit.

2. An operation planning device comprising: a short-term adjustable amount calculation unit that calculates an adjustable amount of power storage and an adjustable amount of power generation on a monthly or daily basis; a long-term plan formulation unit that formulates a long-term plan that is an operation plan including power storage and power generation on an annual basis based on the adjustable amount of power storage and the adjustable amount of power generation calculated by the short-term adjustable amount calculation unit; and a short-term plan formulation unit that formulates a short-term plan that is an operation plan including power storage and power generation on a monthly or daily basis based on the long-term plan formulated by the long-term plan formulation unit.

3. The operation planning device according to claim 1 or 2, wherein the short-term adjustable amount calculation unit includes: a prediction unit that predicts an electricity demand curve and a renewable energy power generation amount, which is the amount of power generated by renewable energy; a maximum gas generation amount calculation unit that calculates a maximum gas generation amount, which is the maximum amount of gas generation related to electricity storage, based on the demand curve and the renewable energy power generation amount predicted by the prediction unit; a maximum gas power generation amount calculation unit that calculates a maximum gas power generation amount, which is the maximum amount of power generation using gas related to the electricity storage, based on the demand curve and the renewable energy power generation amount predicted by the prediction unit; and an adjustable amount calculation unit that calculates the electricity storage adjustable amount based on the maximum gas generation amount calculated by the maximum gas generation amount calculation unit, and calculates the power generation adjustable amount based on the maximum gas power generation amount calculated by the maximum gas power generation amount calculation unit.

4. The operation planning device according to claim 3, wherein the demand curves include demand curves for weekdays and holidays.

5. An operation planning device as described in claim 3 or 4, wherein the renewable energy power generation amount includes a power generation amount by weather.

6. An operational planning device described in any one of claims 3 to 5, wherein the maximum gas production amount calculation unit calculates the maximum gas production amount using the renewable energy during a period in which the amount of renewable energy power generation exceeds the demand curve.

7. An operation planning device described in any one of claims 3 to 6, wherein the maximum gas power generation amount calculation unit calculates the maximum gas power generation amount during a period in which the renewable energy power generation amount does not exceed the demand curve.

8. An operation planning device according to any one of claims 3 to 7, wherein the gas includes methane and hydrogen, the maximum gas production amount includes a maximum methane production amount and a maximum hydrogen production amount, and the maximum gas power generation amount includes a maximum methane power generation amount and a maximum hydrogen power generation amount.

9. An operational planning device as described in claim 8, wherein the maximum gas production amount calculation unit calculates the maximum methane production amount and the maximum hydrogen production amount when methane is produced preferentially, and the maximum methane production amount and the maximum hydrogen production amount when hydrogen is produced preferentially.

10. An operation planning device as described in claim 8 or 9, wherein the maximum gas power generation calculation unit calculates the maximum methane power generation yield and the maximum hydrogen power generation yield when power generation is prioritized over methane, and the maximum methane power generation yield and the maximum hydrogen power generation yield when power generation is prioritized over hydrogen.

11. The operational planning device described in claim 6, wherein the maximum gas production amount calculation unit calculates the purchase price of electricity required to generate the gas and the amount of gas produced equivalent to that purchase price during a period in which the amount of renewable energy power generation does not exceed the demand curve.

12. The operation planning device according to claim 6, wherein the maximum gas production amount calculation unit calculates the maximum gas production amount based on a rated output and an intermediate output of the gas generating device.

13. The operation planning device according to claim 7, wherein the maximum gas-fired power generation calculation unit calculates the maximum gas-fired power generation amount based on the rated output and intermediate output of the gas-fired power generation device.

14. An operation planning device according to any one of claims 3 to 13, wherein the maximum gas production amount calculation unit calculates the maximum gas production amount taking into account a storage battery.

15. An operation planning device according to any one of claims 3 to 14, wherein the maximum gas-fired power generation calculation unit calculates the maximum gas-fired power generation amount taking into account a storage battery.

16. An operational planning method comprising: calculating an adjustable amount of power storage and an adjustable amount of power generation on a monthly or daily basis; formulating a long-term plan, which is an operational plan including power storage and power generation on an annual basis, based on the calculated adjustable amount of power storage and the adjustable amount of power generation; and formulating a short-term plan, which is an operational plan including power storage and power generation on a monthly or daily basis, based on the formulated long-term plan.

17. An operational planning system that formulates an operational plan for power storage and power generation in a power storage system, comprising: a short-term adjustable amount calculation unit that calculates a monthly or daily adjustable amount of power storage and a daily adjustable amount; a long-term plan formulation unit that formulates a long-term plan, which is an operational plan including power storage and power generation on an annual basis, based on the adjustable amount of power storage and the adjustable amount of power generation calculated by the short-term adjustable amount calculation unit; and a short-term plan formulation unit that formulates a short-term plan, which is an operational plan including power storage and power generation on a monthly or daily basis, based on the long-term plan formulated by the long-term plan formulation unit.

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