JP6705319B2 - Integrated control device, integrated control system, integrated control method, and integrated control program - Google Patents

Description

The present invention relates to an overall control device that controls a power generation system, an overall control system, an overall control method, and an overall control program.

In recent years, introduction of a generator using renewable energy such as solar power or wind power (hereinafter referred to as "renewable energy generator") into a power generation system in order to reduce CO ₂ emission and power generation cost. Is progressing. The power generation system can supply the electric power generated by the renewable energy generator to the power grid. On the other hand, since the power generation by the renewable energy generator is easily affected by the weather, there is also a problem that it is difficult for the power generation system to supply power of stable quality to the power grid.

The power supply to the power grid by multiple power generation systems is controlled by the grid central management system. However, in the existing grid central management system, it is necessary to appropriately control the power generation system when the power fluctuates. There are many things that cannot be done. This is because power generation using renewable energy has not been assumed in the first place. Therefore, it is necessary to cope with fluctuations in the power generated by the renewable energy generator while minimizing the impact on the central grid management system.

In order to solve such a problem, in Patent Document 1, when a storage battery is provided in the power generation system and the solar power generator generates power at or above an output target value according to a command from the center, surplus power is temporarily By charging the storage battery to the power source, low quality power is prevented from being supplied to the power grid.

Further, in Patent Document 2, even if the power generated by the renewable energy generator fluctuates based on the operation plan of the thermal power generator and the hydraulic power generator capable of stable power supply and the actual value of the power generation amount, the thermal power generator. And the hydroelectric generator is calculating the amount of electric power that can absorb the fluctuation (the amount that can be connected). Renewable energy generators generate electricity within the range of calculated interconnection capacity. This prevents low quality power from being supplied to the power grid.

JP, 2011-193551, A JP, 2014-90665, A

However, according to Patent Document 1, it is impossible to charge the generated power of renewable energy beyond the maximum capacity of the storage battery. Therefore, when the renewable energy generator generates more power than the power commanded by the system central management system when the storage battery is fully charged, low quality power will be supplied to the power system. For example, if the storage battery is approaching full charge, stop the generator that can control the generated power such as a thermal power generator so that the power generation system does not generate more power than the command power from the grid central management system. To However, it may be difficult to stop the power generation of a renewable energy generator such as a solar power generator. Therefore, after the storage battery is fully charged, there is no choice but to provide the power generated by the renewable energy generator to the power system. Therefore, low-quality power is supplied to the power system.

Further, according to Patent Document 2, the amount of power generated by the renewable energy generator is suppressed within the amount that can be interconnected. As a result, it is possible to prevent the power generated by the renewable energy generator from being supplied to the power system in excess of the capacity that can be interconnected. However, even if the power generated by a renewable energy generator is stable, it is rather supplied to the power grid to reduce thermal power generation from the viewpoint of reducing CO ₂ emissions and power generation costs. The power generated by machines should be suppressed.

The present invention has been made in view of such circumstances, and it is possible to supply stable electric power from a power generation system to a power system while actively causing a renewable energy generator included in the power generation system to generate power. It is an object of the present invention to provide an integrated control device capable of performing the above.

(1) In order to achieve the above object, a general control device according to an embodiment of the present invention includes a renewable energy generator that generates electricity by using renewable energy, and electric power generated by the renewable energy generator. Is a general control device for controlling a power generation system including at least a storage battery that stores electricity, and is stable from the power generation system to a power system based on a predicted power generation amount by the renewable energy generator and a charge amount of the storage battery. The power range information determining unit that determines the power range information that is the information indicating the range of power that can be supplied, and the power range information that the power range information determining unit determines in the planning device that plans the amount of power generation in the power generation system. And a power range information transmission unit for transmitting the.

(8) An overall control system according to another embodiment of the present invention includes at least a renewable energy generator that generates power by using renewable energy and a storage battery that stores the power generated by the renewable energy generator. A comprehensive control system for controlling a power generation system comprising: a range of power that can be stably supplied from the power generation system to a power grid based on a predicted power generation amount by the renewable energy generator and a charge amount of the storage battery. A power range information determining unit that determines the power range information that is the information, and a power range information transmitting unit that transmits the power range information determined by the power range information determining unit to a planning device that plans the amount of power generation in the power generation system. And a section.

(9) A general control method according to another embodiment of the present invention includes at least a renewable energy generator that uses renewable energy to generate power, and a storage battery that stores the power generated by the renewable energy generator. A comprehensive control method for controlling a power generation system comprising: a range of power that can be stably supplied from the power generation system to a power grid based on a predicted power generation amount by the renewable energy generator and a charge amount of the storage battery. It includes a step of determining power range information which is information to be shown, and a step of transmitting the determined power range information to a planning device that plans a power generation amount in the power generation system.

(10) An overall control program according to another embodiment of the present invention includes at least a renewable energy generator that generates electricity using renewable energy and a storage battery that stores the electric power generated by the renewable energy generator. An integrated control program for controlling a power generation system provided, capable of stably supplying a computer from the power generation system to a power grid based on a predicted power generation amount by the renewable energy generator and a charge amount of the storage battery. The power range information determining unit that determines power range information that is information indicating a range of power and a planning device that plans the amount of power generation in the power generation system, the power range information determined by the power range information determining unit is transmitted. It functions as a power range information transmitter.

It may be realized as a semiconductor integrated circuit that realizes a part or all of the integrated control device, or may be realized as another system including the integrated control device.

According to the present invention, it is possible to supply stable electric power from the power generation system to the power system while actively causing the renewable energy power generator included in the power generation system to generate power.

FIG. 1 is a block diagram showing a configuration of a power generation system according to an embodiment of the present invention. FIG. 2 is a flowchart showing a flow of processing executed by the overall control device according to the embodiment of the present invention. FIG. 3A is a diagram for explaining the power range information determination processing (S3 in FIG. 2). FIG. 3B is a diagram for explaining the power range information determination processing (S3 in FIG. 2). FIG. 3C is a diagram for explaining the power range information determination processing (S3 in FIG. 2). FIG. 4 is a graph showing changes over time in the generated power of the wind power generator, the generated power of the solar power generator, and the planned power determined by the system central management system. FIG. 5 is a graph showing the control result of the control unit by executing the operation plan based on the planned power.

First, embodiments of the present invention will be listed and described.
(1) An integrated control device according to an embodiment of the present invention includes at least a renewable energy generator that generates power by using renewable energy, and a storage battery that stores the power generated by the renewable energy generator. A general control device for controlling a power generation system, which indicates a range of power that can be stably supplied from the power generation system to a power system based on a predicted power generation amount by the renewable energy generator and a charge amount of the storage battery. A power range information determination unit that determines power range information that is information, and a power range information transmission unit that transmits the power range information determined by the power range information determination unit to a planning device that plans the amount of power generation in the power generation system. With.

According to this configuration, the power range information determination unit determines the power range information indicating the range of power that can be stably supplied from the power generation system to the power system. For example, the power range information determination unit can determine the range of the amount of power that can be charged and discharged in the storage battery as the power range information. This power range information is calculated based on the predicted power generation amount by the renewable energy generator. Therefore, it is determined in consideration of the power generation amount when the renewable energy power generator actively generates power. In addition, the power range information transmission unit transmits the determined power range information to a planning device (for example, a system central management system) that plans the amount of power generation in the power generation system. Therefore, the planning device can determine the power generation plan of the power generation system based on the power range information. Therefore, stable power can be supplied from the power generation system to the power grid.

(2) Preferably, the power range information determination unit calculates the range of the amount of power that can be charged and discharged in the storage battery, based on the predicted amount of power generated by the renewable energy generator and the amount of charge of the storage battery. The power range information is determined based on the calculated range of the amount of power that can be charged and discharged in the storage battery.

With this configuration, the power range information determination unit can determine the range of the amount of power that can be charged/discharged in the storage battery as the power range information. This power range information is calculated based on the predicted power generation amount by the renewable energy generator. Therefore, the power range information is determined in consideration of the power generation amount when the renewable energy power generator actively generates power.

(3) Preferably, the power range information determination unit is based on the predicted power generation amount by the renewable energy generator, the charge amount of the storage battery, and the maximum capacity of the storage battery, the renewable energy generator. Of the predicted power generation amount according to the above equation, an unchargeable amount that is an amount of electric power that cannot charge the storage battery is calculated, and a lower limit value of the range of the stable supplyable electric power is determined based on the calculated unchargeable amount.

According to this configuration, it is possible to transmit the power range information, which is the lower limit value of the power that can stably supply the power based on the unchargeable amount, to the planning device. Therefore, the planning device can determine a power generation plan that causes the power system to supply at least the electric power based on the unchargeable amount. Therefore, the power generation system can charge the storage battery with the power generated by the renewable energy generator while discharging the unchargeable amount from the storage battery. Therefore, stable power can be supplied from the power generation system to the power system.

(4) Preferably, the power range information determination unit further determines the power range information based on an output characteristic of the power generation system.

According to this configuration, for example, by using the output characteristic of the existing thermal power generator as the output characteristic of the power generation system, the planning device can regard the power generation system as equivalent to the thermal power generator. For example, a thermal power generator takes time to start once it is stopped, but by giving the power generation system the same characteristics, the planning device regards the power generation system as a thermal power generator and determines the power generation plan. can do.

(5) Preferably, the power range information determination unit determines, as the power range information, a range of energy used for power generation that corresponds to the range of stable power that can be supplied.

According to this configuration, the power range information can be determined as the energy range. Some existing planning devices determine a power generation plan based on a range such as the amount of fuel in a thermal power generator or the amount of water in a hydropower generator. Therefore, it is possible to transmit the power range information from the integrated control device to the planning device without changing the existing planning device.

(6) Preferably, the power generation system further includes a power generator that uses fuel or hydraulic power to generate power, and the power range information determination unit further uses a power generator that uses the fuel or hydraulic power to generate power. The power range information is determined based on the power generation amount.

According to this configuration, even if the power generation system includes a generator that can stably generate electric power, such as a thermal power generator or a hydraulic power generator, the amount of power generated by such a generator is high. The power range information can be determined in consideration of the above.

(7) Preferably, the integrated control device further includes a power generation plan information acquisition unit that acquires power generation plan information based on the power range information from the planning device, and the predicted power generation amount by the renewable energy power generator. And an operation plan calculation unit that calculates an operation plan of the renewable energy generator and the storage battery based on the power generation plan information acquired by the power generation plan information acquisition unit.

With this configuration, the renewable energy generator and the storage battery can be operated based on the power generation plan information based on the power range information.

(8) An overall control system according to another embodiment of the present invention includes at least a renewable energy generator that generates power by using renewable energy and a storage battery that stores the power generated by the renewable energy generator. A comprehensive control system for controlling a power generation system comprising: a range of power that can be stably supplied from the power generation system to a power grid based on a predicted power generation amount by the renewable energy generator and a charge amount of the storage battery. A power range information determining unit that determines the power range information that is the information, and a power range information transmitting unit that transmits the power range information determined by the power range information determining unit to a planning device that plans the amount of power generation in the power generation system. And a section.

The integrated control system includes the same components as the integrated control device described above. Therefore, the same operation and effect as those of the above-mentioned integrated control device can be obtained.

(9) A general control method according to another embodiment of the present invention includes at least a renewable energy generator that uses renewable energy to generate power, and a storage battery that stores the power generated by the renewable energy generator. A comprehensive control method for controlling a power generation system comprising: a range of power that can be stably supplied from the power generation system to a power grid based on a predicted power generation amount by the renewable energy generator and a charge amount of the storage battery. It includes a step of determining power range information which is information to be shown, and a step of transmitting the determined power range information to a planning device that plans a power generation amount in the power generation system.

The overall control method includes steps corresponding to the processing units included in the above-described overall control device. Therefore, the same operation and effect as those of the above-mentioned integrated control device can be obtained.

(10) An overall control program according to another embodiment of the present invention includes at least a renewable energy generator that generates electricity using renewable energy and a storage battery that stores the electric power generated by the renewable energy generator. An integrated control program for controlling a power generation system provided, capable of stably supplying a computer from the power generation system to a power grid based on a predicted power generation amount by the renewable energy generator and a charge amount of the storage battery. The power range information determining unit that determines power range information that is information indicating a range of power and a planning device that plans the amount of power generation in the power generation system, the power range information determined by the power range information determining unit is transmitted. It functions as a power range information transmitter.

The overall control program causes a computer to function as each processing unit included in the above-described overall control device. Therefore, the same operation and effect as those of the above-mentioned integrated control device can be obtained.

[Details of Embodiment of Present Invention]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. The invention is defined by the claims. Therefore, among the constituent elements in the following embodiments, the constituent elements not described in the independent claims showing the highest concept of the present invention are not necessarily required to achieve the object of the present invention, but It is described as constituting the preferred form.

[1. Power generation system configuration]
FIG. 1 is a block diagram showing a configuration of a power generation system according to an embodiment of the present invention.
The power generation system 1 is a system that includes at least a renewable energy generator that uses renewable energy to generate power, and a storage battery that stores the power generated by the renewable energy generator. The power generation system 1 includes an integrated control device 10, a wind power generator 20, a solar power generator 30, a storage battery 40, and a thermal power generator 50.

The configuration of the generator included in the power generation system 1 is not limited to this, and may include a hydroelectric generator, a gas generator, a fuel cell, and the like.

Here, the wind power generator 20 and the solar power generator 30 are examples of renewable energy power generators. The power generation system 1 may include a solar heat generator or the like as a renewable energy generator. Although the hydroelectric generator uses water, which is a renewable energy, it may not be included in the renewable energy generator because it can stably generate electricity.

The integrated control device 10 is connected to the grid central management system 3 that is an example of a planning device that plans the amount of power generation in the power generation system 1, and according to the power generation planning information transmitted from the grid central management system 3, the wind power generator 20, the solar It controls the photovoltaic power generator 30, the storage battery 40, and the thermal power generator 50. Although not shown, a power conditioner is connected to each generator and storage battery 40, and the overall control device 10 controls each generator and storage battery 40 via the power conditioner as appropriate.

The storage battery 40 is, for example, a lead storage battery, a sodium/sulfur battery, a redox flow battery, a nickel/hydrogen battery, a lithium ion battery, or the like.

The integrated control device 10 is connected to the weather forecast server 2 and the grid central management system 3 via a communication line such as the Internet, and has a power generation prediction unit 11, a power range information determination unit 12, a power range information transmission unit 13, The power generation plan information acquisition unit 14, the operation plan calculation unit 15, and the control unit 16 are provided.

The power generation prediction unit 11 receives weather information from the weather forecast server 2 via the communication I/F (interface). For example, the power generation prediction unit 11 receives predicted value information of the amount of solar radiation and wind speed every 30 minutes as weather information.

The power generation prediction unit 11 is based on the received weather information and the rating information of the wind power generator 20 and the solar power generator 30, and the wind power generator 20 and the solar power generator 30 for each unit time (for example, 30 minutes). Predict the power generation amount of. That is, the power generation prediction unit 11 uses the solar power generator 30 for 30 minutes based on the predicted value of the solar radiation amount and the rated value of the solar power generator 30 (the maximum power generation amount of the solar power generator 30, the system output coefficient, etc.). Predict the power generation amount of. Further, the power generation prediction unit 11 predicts the amount of power generated by the wind power generator 20 for 30 minutes based on the predicted value of the wind speed and the rated value of the wind power generator 20 (maximum power generation amount of the wind power generator 20, output coefficient, etc.). To do. As the prediction method, a known method can be used instead of the main purpose of the present application.

The power range information determination unit 12 determines the amount of power that can be stably supplied from the power generation system 1 to the power grid based on the predicted power generation amount by the power generation prediction unit 11 and the charging amount of the storage battery 40 at a predetermined time (for example, the current time). The power range information, which is the information indicating the range, is determined.

That is, the power range information determination unit 12 calculates the range of the amount of power that can be charged and discharged in the storage battery 40, and corresponds to the range of the amount of power that is calculated based on the calculated range of the amount of power that can be charged and discharged in the storage battery 40. The power range is determined as power range information. A method of determining the power range information by the power range information determination unit 12 will be described later.

The power range information transmission unit 13 transmits the power range information determined by the power range information determination unit 12 to the system central management system 3 via the communication I/F. Thus, the system central management system 3 can know the maximum amount of power that the power generation system 1 can generate and the minimum amount of power that the power generation system 1 can generate or the maximum amount of power that the power generation system 1 can charge.

That is, the system central management system 3 can regard the power generation system 1 as a combination of a power generator capable of generating power within the range indicated by the power range information and a rechargeable storage battery, or within the range indicated by the power range information. It can also be regarded as one chargeable/dischargeable storage battery.

The system central management system 3 creates the power generation plan information by the power generation system 1 based on the power range information received from the integrated control device 10 and the predicted value of the power demand of the customer. In addition to the power generation system 1 shown in FIG. 1, a plurality of power generation systems 1 are connected to the system central management system 3. Therefore, for example, the grid central management system 3 determines a power generation plan for each power generation system 1 so as to minimize the total power cost or CO ₂ emission amount of the plurality of power generation systems 1, and outputs the power generation plan information. It is transmitted to the integrated control device 10.

That is, the system central management system 3 sets the total power cost or CO ₂ emission amount of the plurality of power generation systems 1 as an objective function, and can generate the maximum power amount and the minimum power amount that can be generated in each power generation system 1 and the power consumption in the customer. The forecast value of demand and the constraint condition. The power system central management system 3 solves the power generation amount or the charge amount of each power generation system 1 when the objective function is minimized under a constraint condition by using a mathematical programming method such as a linear programming method to generate a power generation plan. You may decide.

Such determination of the power generation plan may be performed every unit time (for example, 30 minutes).

The power generation plan information acquisition unit 14 acquires the power generation plan information by receiving the power generation plan information from the system central management system 3 via the communication I/F. For example, the power generation plan information acquisition unit 14 receives power generation plan information for each unit time (for example, 30 minutes) from the system central management system 3.

The operation plan calculation unit 15 calculates each power generator based on the predicted power generation amount of the wind power generator 20 and the solar power generator 30 predicted by the power generation prediction unit 11 and the power generation plan information acquired by the power generation plan information acquisition unit 14. An operation plan for 20, 30, and 50 and the storage battery 40 is calculated.

For example, it is assumed that it is necessary to generate electric power of 1000 kWh per unit time based on the electric power generation plan information. Further, it is assumed that the total predicted power generation amount of the wind power generator 20 and the solar power generator 30 per unit time predicted by the power generation prediction unit 11 is 2500 kWh. In this case, the operation plan calculation unit 15 discharges 1000 kWh of electric power from the storage battery 40 to the power system per unit time, and charges the storage battery 40 with 2500 kWh of electric power generated by the wind power generator 20 and the solar power generator 30. To calculate.

The control unit 16 controls each generator and the storage battery 40 based on the operation plan of each generator and the storage battery 40 calculated by the operation plan calculation unit 15.

For example, based on the above-mentioned operation plan, the control unit 16 controls the storage battery 40 to discharge the electric power of 1000 kWh to the electric power system during the unit time. In addition, the control unit 16 controls the wind power generator 20, the solar power generator 30, and the storage battery 40 so that the total power of 2500 kWh generated by the wind power generator 20 and the solar power generator 30 during a unit time is stored in the storage battery 40. To charge. As a result, the storage battery 40 is charged with 1500 kWh of electric power at the end of the unit time as compared with the start of the unit time.

[2. Process flow of integrated control device 10]
FIG. 2 is a flowchart showing a flow of processing executed by centralized control device 10 according to the embodiment of the present invention.

The power generation prediction unit 11 receives, from the weather forecast server 2, predicted value information of the amount of solar radiation and wind speed as weather information (S1).

The power generation prediction unit 11 is based on the received weather information and the rating information of the wind power generator 20 and the solar power generator 30, and the wind power generator 20 and the solar power generator 30 for each unit time (for example, 30 minutes). The power generation amount is predicted (S2).

The power range information determination unit 12 determines power range information, which is information indicating a range of power that can be stably supplied from the power generation system 1 to the power grid, based on the charge amount of the storage battery 40 at a predetermined time (for example, the current time). Determine (S3).
Hereinafter, the power range information determination process (S3) will be described in detail.

3A to 3C are diagrams for explaining the power range information determination process (S3). 3A to 3C are graphs showing power range information of different patterns. The horizontal axis of the graph represents time and the vertical axis represents power.

The rated discharge power is the sum of the maximum generated power of the wind power generator 20, the maximum generated power of the solar power generator 30, the maximum discharged power of the storage battery 40, and the maximum generated power of the thermal power generator 50. That is, the rated discharge power indicates the maximum power that can be discharged (provided) from the power generation system 1 to the power system.

The rated charging power is the maximum charging power of the storage battery 40. That is, the rated charging power indicates the maximum power that the power generation system 1 can receive and charge from the power grid.

The power range information determination unit 12 determines the power range information from the predetermined time t to the unit time n. The predetermined time can be, for example, the current time.
The charge amount indicates the charge amount of the storage battery 40 at the predetermined time t.

The scheduled charging amount indicates the total predicted power generation amount of the wind power generator 20 and the solar power generator 30 from the time t to the time (t+n) predicted by the power generation prediction unit 11. It is assumed that the storage battery 40 is once charged with the electric power generated by the wind power generator 20 and the solar power generator 30.
The sum of the charge amount and the scheduled charge amount is defined as pre_charge.
The chargeable amount is calculated by the following formula 1.
Chargeable amount=max_SOC-pre_charge (Equation 1)
Here, max_SOC indicates the maximum capacity (maximum chargeable electric energy) of the storage battery 40.

That is, the chargeable amount indicates the amount of electric power that can be further charged even if the storage battery 40 is fully charged with the scheduled charge amount.
FIG. 3A shows a case where the chargeable amount>0.

The thermal power generation power amount indicates the amount of power that can be generated by the thermal power generator 50 from time t to time (t+n). The thermal power generation amount is determined according to the fuel amount of the thermal power generator 50 such as oil, but when the fuel is abundant, the thermal power generation amount should be the maximum power generation amount of the thermal power generator 50. You can

As shown in FIG. 3A, when the chargeable amount is >0, the power range information determination unit 12 divides the value obtained by inverting the sign of the chargeable amount (−chargeable amount) by the time n, It is determined to be the minimum value (SO_min) of the power range that can be stably supplied from the power generation system 1 to the power system. Here, the minimum value (SO_min) of the power range is a negative value, which indicates that the power system can be charged with the power SO_min from the power system.

Further, the power range information determination unit 12 determines a value obtained by dividing the sum of pre_charge and the thermal power generation amount by the time n as the maximum value (SO_max) of the power range indicated by the power range information.

FIG. 3B shows the case where the chargeable amount=0. In this case, the power range information determination unit 12 determines the minimum value (SO_min) of the power range to be 0. Further, as in the case of FIG. 3A, the power range information determination unit 12 determines the value obtained by dividing the sum of pre_charge and thermal power generation amount by the time n as the maximum value (SO_max) of the power range.

FIG. 3C shows the case where the chargeable amount <0. That is, even if the storage battery 40 is fully charged with the scheduled charging amount, the amount of electric power that cannot be fully charged is generated. The amount of charge that cannot be fully charged in the storage battery 40 is referred to as an unchargeable amount here. The unchargeable amount is defined by the following Expression 2.
Unchargeable amount =-Rechargeable amount
=pre_charge-max_SOC (Equation 2)

In the case of the chargeable amount<0 (non-chargeable amount>0) shown in FIG. 3C, the power range information determination unit 12 sets the value obtained by dividing the chargeable amount by the time n as the minimum value (SO_min) of the power range. decide. In addition, the power range information determination unit 12 determines a value obtained by dividing the sum of the unchargeable amount, pre_charge, and the thermal power generation power amount by the time n as the maximum value (SO_max) of the power range. Thereby, the power range can be determined such that the unchargeable amount of power is forcibly discharged from the power generation system 1 to the power grid between time t and time (t+n).

It should be noted that the minimum value (SO_min) and the maximum value (SO_max) of the power range are not limited to the values calculated by the above-described method, and for example, a value obtained by adding a certain value to the calculated value is the power range. May be the minimum value (SO_min) and the maximum value (SO_max).

The power range information transmission unit 13 transmits the power range information determined by the power range information determination unit 12 as described above to the system central management system 3 via the communication I/F (S4).

The power generation plan information acquisition unit 14 acquires the power generation plan information by receiving the power generation plan information from the system central management system 3 via the communication I/F (S5). In the power generation plan information, for example, the output power from the power generation system 1 to the power grid for each unit time (hereinafter, referred to as “planned power”) is shown.

The operation plan calculation unit 15 uses the predicted power generation amounts of the wind power generator 20 and the solar power generator 30 predicted by the power generation prediction unit 11 in step S2 and the power generation plan information acquired by the power generation plan information acquisition unit 14 in step S5. Based on this, an operation plan for each of the generators 20, 30 and 50 and the storage battery 40 is calculated (S6).

For example, the operation plan calculation unit 15 charges the storage battery 40 from the wind power generator 20 and the solar power generator 30 with the power of the predicted power generation amount during the unit time, while discharging the power from the storage battery 40 and the thermal power generator 50. The operation plan of each generator and the storage battery 40 is calculated such that the total of the generated electric power of the above is equal to the planned electric power.

The operation plan calculation unit 15 may calculate the operation plan by solving a mathematical programming problem such as a linear programming problem. The objective function at this time is the total power cost or CO ₂ emission amount of the power generation system 1. The constraint conditions are the planned power, the predicted power generation amount of the wind power generator 20 and the solar power generator 30, the SOC (State of Charge) of the storage battery 40, and the like.

The control unit 16 controls each generator and the storage battery 40 based on the operation plan of each generator and the storage battery 40 calculated by the operation plan calculation unit 15 (S7). Since the power generation prediction unit 11 predicts the power generation amount based on the weather information, a difference may occur between the actual power generation amount and the predicted power generation amount. Therefore, the control unit 16 monitors the above-mentioned difference and appropriately adjusts the output of the storage battery or the controllable generator so that the power generation plan received from the system central management system 3 can be achieved.

The processes of steps S1 to S7 described above are periodically executed at predetermined time intervals (loop A).

[3. Example of control by integrated control device 10]
Next, a control example of each generator and the storage battery 40 by the integrated control device 10 will be described.

FIG. 4 is a graph showing changes over time in the generated power 101 of the wind power generator 20, the generated power 102 of the solar power generator 30, and the planned power 103 determined by the system central management system 3. The horizontal axis of the graph represents time (h) and the vertical axis represents electric power (kW).

It can be seen that the generated power 101 of the wind power generator 20 is unstable due to large power fluctuations. Further, it can be seen that the generated power 102 of the solar power generator 30 is unstable, though not so much as the generated power 101 of the wind power generator 20.

The integrated control device 10 determines the power range information based on the predicted power generation amounts of the wind power generator 20 and the solar power generator 30, and the SOC and rating of the storage battery 40. The grid central management system 3 calculates the planned power 103 in the power generation system 1 based on the power range information determined by the centralized control device 10 and the power demand forecast in the area under its control. Although not shown, a plurality of power generation systems 1 are included in an area controlled by the grid central management system 3, and the grid central management system 3 calculates the planned power 103 of each of the plurality of power generation systems 1. Good.

The integrated control device 10 controls each facility (the storage battery 40 and the thermal power generator 50 in this embodiment) so that the power generation system 1 can generate power according to the planned power 103 indicated in the power generation plan information received from the grid central management system 3. Create an operation plan. Hereinafter, the operation plan created according to the planned power 103 shown in FIG. 4 is referred to as an operation plan X.

FIG. 5 is a graph showing the control result of the control unit 16 by executing the operation plan X based on the planned power 103. The horizontal axis of the graph represents time (h), and the vertical axis represents electric power (kW) or SOC (%) of the storage battery 40. The graph shows the output power 104 of the power generation system 1, the generated power 105 of the thermal power generator 50, the charge/discharge power 106 of the storage battery 40, and the SOC 107 of the storage battery 40.

The control unit 16 controls the thermal power generator 50 and the storage battery 40 so that the electric power is output from the power generation system 1 according to the planned electric power 103 shown in FIG. 4 according to the operation plan X. Further, since the planned generated power of the wind power generator 20 and the planned generated power of the solar power generator 30 are values based on the prediction, they are the actual generated power 101 of the wind power generator 20 and the actual generated power 102 of the solar power generator 30. May be different. Therefore, the control unit 16 monitors the power generation power 101 of the wind power generator 20 and the power generation power 102 of the solar power generator 30, and the storage battery so that the power generation plan received from the grid central management system 3 can be achieved. The output of 40 and the thermal power generator 50 is adjusted appropriately. Therefore, the output power 104 of the power generation system 1 becomes equal to the planned power 103.

In fact, for example, between 9:00 and 11:00, the generated power 102 of the solar power generator 30 is large, but the planned power 103 is small. In such a time zone, the charge/discharge power 106 has a negative value, and it can be seen that the generated power 102 of the solar power generator 30 is being charged.

Further, between 21:00 and 22:00, the generated power 101 of the wind power generator 20 and the generated power 102 of the solar power generator 30 are small, but the planned power 103 is large. In such a time zone, the charging/discharging power 106 has a positive value, and it can be seen that the power discharged from the storage battery 40 is provided to the power system.

Furthermore, when the generated power 102 of the solar power generator 30 is large and the planned power 103 is also large, as in the time zone slightly before 9 o'clock, the charge/discharge power 106 changes slightly above 0. is doing. In such a time zone, it can be seen that the electric power generated by the solar battery 30 is being charged into the storage battery 40 while the electric power discharged from the storage battery 40 is being provided to the power system.

[4. Effects of First Embodiment, etc.]
As described above, according to the embodiment of the present invention, the power range information determination unit 12 determines the power range information indicating the range of power that can be stably supplied from the power generation system 1 to the power grid. For example, the power range information determination unit 12 can determine the range of the amount of power that can be charged and discharged in the storage battery 40 as the power range information. This power range information is calculated based on the predicted power generation amount by the renewable energy generator (the wind power generator 20 and the solar power generator 30). Therefore, it is determined in consideration of the power generation amount when the renewable energy power generator actively generates power. Further, the power range information transmission unit 13 transmits the determined power range information to the system central management system 3 as a planning device that plans the amount of power generation in the power generation system 1. Therefore, the system central management system 3 can determine the power generation plan of the power generation system 1 based on the power range information. Therefore, stable power can be supplied from the power generation system 1 to the power grid.

Further, as shown in FIG. 3C, the power range information determination unit 12 determines the power range information that is the lower limit value of the power that can stably supply the power based on the unchargeable amount, and the power range information transmission unit 13 The power range information determined by the power range information determination unit 12 is transmitted to the system central management system 3. Therefore, the system central management system 3 can determine a power generation plan that allows the power system to supply at least the electric power based on the unchargeable amount. Therefore, the power generation system 1 can charge the storage battery 40 with the electric power generated by the renewable energy generator while discharging the storage battery 40 with an unchargeable amount. Therefore, the power generated by the renewable energy generator is not directly supplied to the power system. Therefore, stable power can be supplied from the power generation system 1 to the power grid.

In addition, even when the power range information determining unit 12 includes a generator capable of generating stable power, such as the thermal power generator 50 or the hydraulic power generator, in the power generation system 1, The power range information can be determined in consideration of the amount of power generated by such a generator.

Further, the operation plan calculation unit 15 can operate the renewable energy generator and the storage battery 40 based on the power generation plan information created by the system central management system 3 based on the power range information.

[5. Note]
The power generation system 1 according to the embodiment of the present invention has been described above centering on the overall control device 10, but the present invention is not limited to this embodiment.

The power range information determination unit 12 may determine the power range information based on the output characteristics of the power generation system 1. For example, by using the output characteristic of the existing thermal power generator as the output characteristic of the power generation system 1, the system central management system 3 can regard the power generation system 1 as equivalent to the thermal power generator. For example, although it takes time for the thermal power generator to start up once it is stopped, the power generation system 1 may be provided with the same characteristics and power range information that gradually increases the generated power may be created. For example, the upper limit value may be corrected by multiplying the upper limit value of the power range information by a coefficient that increases with time from 0 to 1 for a predetermined time from the start of the power generation system 1. Thus, the system central management system 3 can determine the power generation plan by regarding the power generation system 1 as a thermal power generator.

The power range information determination unit 12 determines, as the power range information, the range of power that can be stably supplied from the power generation system 1 to the power grid. However, the range of power that can be stably supplied corresponds to the range of energy used for power generation. The range may be determined as the power range information. That is, the power range information determination unit 12 may determine, as the power range information, a range of energy that can generate power within the range of power that can be stably supplied. Energy is, for example, fuel in the thermal power generator 50 or water in the hydroelectric power generator. Some of the existing system central management systems 3 determine a power generation plan based on, for example, the amount of fuel (liter) of the thermal power generator 50 or the amount of water (square meter) of the hydroelectric generator. Therefore, it is possible to transmit the power range information from the integrated control device 10 to the system central management system 3 without changing the existing system central management system 3.

The overall control device 10 may be specifically configured as a computer system including a microprocessor, a ROM, a RAM, a hard disk drive, a display unit, a keyboard, a mouse, and the like. A computer program is stored in the RAM or the hard disk drive. The integrated control device 10 achieves its function by the microprocessor operating according to the computer program. Here, the computer program is configured by combining a plurality of instruction codes indicating instructions to the computer in order to achieve a predetermined function.

Further, some or all of the constituent elements of the overall control device 10 may be composed of one system LSI. The system LSI is a super-multifunctional LSI manufactured by integrating a plurality of constituent parts on one chip, and specifically, is a computer system including a microprocessor, ROM, RAM and the like. .. A computer program is stored in the RAM. The system LSI achieves its function by the microprocessor operating according to the computer program.

Further, the present invention may be the methods described above. Further, the present invention may be a computer program that realizes these methods by a computer, or may be a digital signal including the computer program.

Furthermore, the present invention may be a computer-readable non-transitory recording medium such as a hard disk drive, a CD-ROM, or a semiconductor memory in which the computer program or the digital signal is recorded. Further, it may be the digital signal recorded on these non-temporary recording media.

Further, each step included in the above program may be executed by a plurality of computers. That is, the integrated control device 10 may be realized as an integrated control system. Each processing unit included in the integrated control device 10 is distributed and arranged in a plurality of computers included in the integrated control system. For example, the overall control system may include a first computer that determines power range information and a first computer that calculates an operation plan and controls each generator and storage battery 40. When the first computer and the second computer perform the linked operation, the integrated control system can achieve the same operation and effect as the integrated control device 10.
Further, the above embodiment and the above modifications may be combined.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above meaning but by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

DESCRIPTION OF SYMBOLS 1 power generation system 2 weather forecast server 3 system central management system 10 integrated control device 11 power generation prediction unit 12 power range information determination unit 13 power range information transmission unit 14 power generation plan information acquisition unit 15 operation plan calculation unit 16 control unit 20 wind power generator 30 Solar power generator 40 Storage battery 50 Thermal power generator

Claims (12)

A general control device for controlling a power generation system including at least a renewable energy generator that generates power using renewable energy, and a storage battery that stores the power generated by the renewable energy generator,
Based on the predicted power generation amount by the renewable energy generator and the charge amount of the storage battery, the range of the amount of power that can be charged and discharged in the storage battery is calculated, and the range of the amount of power that can be charged and discharged in the storage battery that has been calculated. A power range information determining unit that determines power range information, which is information indicating a range of power that can be stably supplied from the power generation system to a power system,
An integrated control device comprising: a planning device that plans the amount of power generation in the power generation system; and a power range information transmission unit that transmits the power range information determined by the power range information determination unit. A general control device for controlling a power generation system including at least a renewable energy generator that generates power using renewable energy, and a storage battery that stores the power generated by the renewable energy generator,
Power range information that determines power range information that is information indicating a range of power that can be stably supplied from the power generation system to the power grid based on the predicted power generation amount by the renewable energy generator and the charge amount of the storage battery. The decision section,
A planning device that plans the amount of power generation in the power generation system, and a power range information transmission unit that transmits the power range information determined by the power range information determination unit,
The power range information determination unit, based on the predicted power generation amount by the renewable energy generator, the charge amount of the storage battery, and the maximum capacity of the storage battery, the predicted power generation amount of the renewable energy generator An overall control device that calculates an unchargeable amount, which is an amount of electric power that cannot charge the storage battery, and determines a lower limit value of the range of the stable supplyable electric power based on the calculated unchargeable amount. The integrated control device according to claim 1 or 2, wherein the power range information determination unit further determines the power range information based on an output characteristic of the power generation system. The said electric power range information determination part determines the range of the energy utilized for electric power generation corresponding to the range of the electric power which can be stably supplied as the said electric power range information. Integrated control device. The power generation system further includes a generator that generates power using fuel or hydraulic power,
The power range information determining unit further determines the power range information based on the amount of power generated by a generator that generates power using the fuel or hydraulic power. Integrated control device. further,
From the planning device, a power generation plan information acquisition unit that acquires power generation plan information based on the power range information,
An operation plan calculation unit that calculates an operation plan of the renewable energy generator and the storage battery based on the predicted power generation amount by the renewable energy generator and the power generation plan information acquired by the power generation plan information acquisition unit. The integrated control device according to claim 1, further comprising: A comprehensive control system for controlling a power generation system including at least a renewable energy generator that generates power using renewable energy, and a storage battery that stores the power generated by the renewable energy generator,
Based on the predicted power generation amount by the renewable energy generator and the charge amount of the storage battery, the range of the amount of power that can be charged and discharged in the storage battery is calculated, and the range of the amount of power that can be charged and discharged in the storage battery that has been calculated. A power range information determining unit that determines power range information, which is information indicating a range of power that can be stably supplied from the power generation system to a power system,
An integrated control system comprising: a planning device that plans the amount of power generation in the power generation system; and a power range information transmission unit that transmits the power range information determined by the power range information determination unit. A comprehensive control system for controlling a power generation system including at least a renewable energy generator that generates power using renewable energy, and a storage battery that stores the power generated by the renewable energy generator,
Power range information that determines power range information that is information indicating a range of power that can be stably supplied from the power generation system to the power grid based on the predicted power generation amount by the renewable energy generator and the charge amount of the storage battery. The decision section,
A planning device that plans the amount of power generation in the power generation system, and a power range information transmission unit that transmits the power range information determined by the power range information determination unit,
The power range information determination unit, based on the predicted power generation amount by the renewable energy generator, the charge amount of the storage battery, and the maximum capacity of the storage battery, the predicted power generation amount of the renewable energy generator An overall control system for calculating an unchargeable amount, which is an amount of electric power that cannot charge the storage battery, and determining a lower limit value of the range of stable power that can be stably supplied based on the calculated unchargeable amount. A general control method for controlling a power generation system comprising at least a renewable energy generator that generates power using renewable energy, and a storage battery that stores the power generated by the renewable energy generator,
Based on the predicted power generation amount by the renewable energy generator and the charge amount of the storage battery, the range of the amount of power that can be charged and discharged in the storage battery is calculated, and the range of the amount of power that can be charged and discharged in the storage battery that has been calculated. A step of determining power range information, which is information indicating a range of power that can be stably supplied from the power generation system to a power system,
Transmitting the determined power range information to a planning device that plans the amount of power generation in the power generation system. A general control method for controlling a power generation system comprising at least a renewable energy generator that generates power using renewable energy, and a storage battery that stores the power generated by the renewable energy generator,
Deciding power range information, which is information indicating a range of power that can be stably supplied from the power generation system to a power grid, based on the predicted power generation amount by the renewable energy generator and the charge amount of the storage battery;
A step of transmitting the power range information determined in the step of determining the power range information to a planning device that plans the amount of power generation in the power generation system,
In the step of determining the power range information, the predicted power generation by the renewable energy generator based on the predicted power generation amount by the renewable energy generator, the charge amount of the storage battery, and the maximum capacity of the storage battery. An uncontrollable amount, which is an amount of electric power that cannot charge the storage battery, is calculated, and a lower limit value of a range of the stable supplyable electric power is determined based on the calculated unchargeable amount. A comprehensive control program for controlling a power generation system including at least a renewable energy generator that generates power using renewable energy, and a storage battery that stores the power generated by the renewable energy generator,
Computer,
Based on the predicted power generation amount by the renewable energy generator and the charge amount of the storage battery, the range of the amount of power that can be charged and discharged in the storage battery is calculated, and the range of the amount of power that can be charged and discharged in the storage battery that has been calculated. A power range information determining unit that determines power range information, which is information indicating a range of power that can be stably supplied from the power generation system to a power system,
An integrated control program for causing a planning device that plans the amount of power generation in the power generation system to function as a power range information transmission unit that transmits the power range information determined by the power range information determination unit. A comprehensive control program for controlling a power generation system including at least a renewable energy generator that generates power using renewable energy, and a storage battery that stores the power generated by the renewable energy generator,
Computer,
Power range information that determines power range information that is information indicating a range of power that can be stably supplied from the power generation system to the power grid based on the predicted power generation amount by the renewable energy generator and the charge amount of the storage battery. The decision section,
A comprehensive control program for causing a planning device that plans the amount of power generation in the power generation system to function as a power range information transmission unit that transmits the power range information determined by the power range information determination unit,
The power range information determination unit, based on the predicted power generation amount by the renewable energy generator, the charge amount of the storage battery, and the maximum capacity of the storage battery, the predicted power generation amount of the renewable energy generator An integrated control program for calculating an unchargeable amount, which is an amount of electric power that cannot be charged to the storage battery, and determining a lower limit value of the range of the electric power that can be stably supplied based on the calculated unchargeable amount.