Power system adjustment device and power system adjustment program

Abstract

A microgrid of the present invention includes a solar power generation system, power customers, a power generation system, a hydrogen production system, and a storage battery system. An EMS comprises: a target presenting unit that presents a target power; a power acquiring unit that acquires confluent power obtained by adding the power output by the solar power generation system, the power consumed by the power customers, the power output by the power generation system, the power consumed by the hydrogen production system, and the power output or consumed by the storage battery system; and a command value generation unit that generates a command value so that the confluent power asymptotically approaches to the target power. The confluent power includes a long intermediate period component and a short period component. The command value generation unit outputs a command value corresponding to the long intermediate period component to the power generation system or the hydrogen production system. The command value generation unit outputs a command value corresponding to the short period component to the storage battery system.

Description

Technical Field

[0001] The present disclosure describes an adjustment device for a power system and an adjustment program for a power system.

Background Art

[0002] In recent years, the spread of renewable energy has been progressing. Renewable energy includes solar power generation and wind power generation. Renewable energy such as solar power generation and wind power generation is also called variable renewable energy. When a power generation device that generates renewable energy is directly connected to a power grid, it is known that depending on the scale of the power generation device, it may have an adverse effect on the voltage and frequency of the power grid. Under such circumstances, while the spread of renewable energy is progressing, concerns about the impact of the variability of renewable energy on the existing power network are also increasing.

[0003] For example, as a countermeasure to reduce the impact of the variability of renewable energy on the power network, attention has been focused on a technology (P2G) for producing hydrogen using surplus power of renewable energy. P2G converts the power obtained from renewable energy into hydrogen, which is a gas energy excellent for storage. That is, it converts a gas mainly composed of fossil fuel (such as city gas) into hydrogen.

[0004] Patent Documents 1 to 4 disclose technologies related to a power conditioning device using a water electrolysis device and a storage battery. Paragraphs 0051 to 0053 and FIG. 2 of Patent Document 1 disclose a system applicable to a facility equipped with a solar power generation facility. The system of Patent Document 1 combines a hydrogen production facility, a fuel cell, and a storage battery to monitor and control imbalance. The system of Patent Document 2 matches the set power supply and demand, such as demand response, by controlling the input power to the hydrogen production facility. The control technology of Patent Document 3 charges and discharges the storage battery so as not to deviate from the target range of power consumption. The control technology of Patent Document 3 corrects the target range of power consumption based on the difference between the current power generation amount of solar power generation and the planned purchase value of the generated power. Patent Document 4 discloses an energy management system. The energy management system of Patent Document 4 monitors the distribution power between the connection points of the solar power generation and the water electrolysis device. Then, the energy management system of Patent Document 4 creates a power consumption command value for water electrolysis based on a power threshold value.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Non-Patent Documents

[0006]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] The P2G system may be adjacent to power plants such as solar power generation and wind power generation. The P2G system does not simply use the surplus power of solar power generation or wind power generation. This is because the P2G system is required to convert energy into hydrogen by consuming power at the stage before the unstable power of renewable energy flows into the power grid.

[0008] In such a case, the P2G system is required to have an operation of consuming power based on unstable renewable energy and an operation of controlling the power (power reception and transmission power) at the connection part with the power grid. More specifically, the P2G system is required to have a power adjustment speed (instantaneous responsiveness) that can immediately absorb the power based on unstable renewable energy before it flows into the power grid. In addition to instantaneous responsiveness, the P2G system is also required to have sustainability for continuously adjusting the power.

[0009] This disclosure describes an adjustment device for a power system and an adjustment program for a power system that can achieve both instantaneous responsiveness and sustainability.

Means for Solving the Problem

[0010] One aspect of the present disclosure is an adjustment device for a power system. The power system includes a renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device with adjustable consumed power, an energy storage device having a second responsiveness equal to or higher than the first responsiveness and storing the received power and outputting the stored power, and a power consumer including facilities that consume the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the energy storage device. The adjustment device for the power system includes a target presentation unit that indicates a target power, a power acquisition unit that obtains a combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device and / or the power consumed by the demand device, the power output or consumed by the energy storage device, and the power consumed by the power consumer, and a command value generation unit that generates a first command value and a second command value such that the combined power approaches the target power. The combined power includes a long and medium cycle component including a first fluctuation component and a short cycle component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. The command value generation unit outputs the first command value corresponding to the long and medium cycle component to the power generation device and / or the demand device, and outputs the second command value corresponding to the short cycle component to the energy storage device.

Advantages of the Invention

[0011] According to the adjustment device for the power system and the adjustment program for the power system of the present disclosure, immediate responsiveness and sustainability can be achieved simultaneously.

Brief Description of the Drawings

[0012]

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Embodiments for Carrying Out the Invention

[0013] One aspect of the present disclosure is an adjustment device for a power system. The power system includes a renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device having adjustable consumed power, a storage energy device having a second responsiveness equal to or higher than the first responsiveness and storing the received power and outputting the stored power, and a power consumer including equipment that consumes the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the storage energy device. The adjustment device for the power system includes a target presentation unit that indicates a target power, a power acquisition unit that obtains a combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device and / or the power consumed by the demand device, the power output or consumed by the storage energy device, and the power consumed by the power consumer, and a command value generation unit that generates a first command value and a second command value such that the combined power approaches the target power. The combined power includes a long- and medium-period component including a first fluctuation component and a short-period component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. The command value generation unit outputs the first command value corresponding to the long- and medium-period component to the power generation device and / or the demand device, and outputs the second command value corresponding to the short-period component to the storage energy device.

[0014] Another aspect of the present disclosure is an adjustment program for a power system that causes a computer to adjust the power system. The power system includes a renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device with adjustable consumed power, an energy storage device having a second responsiveness equal to or higher than the first responsiveness and storing received power and outputting the stored power, and a power consumer including equipment that consumes the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the energy storage device. The adjustment program for the power system includes indicating a target power, obtaining a combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device and / or the power consumed by the demand device, the power output or consumed by the energy storage device, and the power consumed by the power consumer, and generating a first command value and a second command value such that the combined power asymptotically approaches the target power. The combined power includes a long and medium period component including a first fluctuation component and a short period component including a second fluctuation component characterized by belonging to a frequency band higher than the first fluctuation component. In generating the first command value and the second command value, the computer is caused to output the first command value corresponding to the long and medium period component to the power generation device and / or the demand device, and output the second command value corresponding to the short period component to the energy storage device.

[0015] The above-described power system adjustment device and power system adjustment program cause a power generation device and / or a demand device to bear a long- and medium-period component including a first fluctuation component for the combined power including power based on renewable energy. According to this configuration, it is possible to obtain the sustainability of continuously adjusting the power. The power system adjustment device and the power system adjustment program cause an energy storage device to bear a short-period component including a second fluctuation component that belongs to a frequency band higher than that of the first fluctuation component. According to this configuration, it is possible to obtain a power adjustment speed capable of immediately absorbing the power based on unstable renewable energy before it flows into the power grid. That is, immediate responsiveness can be obtained. As a result, the above-described power system adjustment device and power system adjustment program can achieve both immediate responsiveness and sustainability.

[0016] The power acquisition unit included in the power system adjustment device, which is one aspect, may further acquire the power output from the renewable energy power generation device and the power consumed by the power consumer. The command value generation unit may generate a first command value corresponding to the long- and medium-period component using the power output from the renewable energy power generation device, the power consumed by the power consumer, and the target power. The command value generation unit may generate a second command value corresponding to the short-period component using the combined power and the target power. According to this configuration, it is possible to generate the first command value that realizes the required sustainability. It is possible to generate the second command value that realizes the required power adjustment speed.

[0017] The power acquisition unit included in the power system adjustment device, which is one aspect, may further acquire the power stored in the energy storage device. The target presentation unit may further indicate a target energy storage value, which is a target value of the power stored in the energy storage device. The command value generation unit may generate the second command value so that the remaining amount of the power stored in the energy storage device asymptotically approaches the target energy storage value. According to this configuration, it is possible to asymptotically approach the remaining amount of the power stored in the energy storage device to a desired amount.

[0018] The target presentation unit included in the adjustment device of the power system, which is one aspect, may further indicate the minimum target command value that is the minimum value of the first command value and / or the maximum target command value that is the maximum value of the first command value. When the first command value is less than or equal to the minimum target command value, the command value generation unit may output the minimum target command value as the first command value. When the first command value is greater than or equal to the maximum target command value, the command value generation unit may output the maximum target command value as the first command value. According to this configuration, control can be performed in accordance with the operating conditions of the power generation device and / or the demand device.

[0019] The command value generation unit included in the adjustment device of the power system, which is one aspect, may output the minimum target command value or the maximum target command value to the demand device. The command value generation unit may output a complementary command value that causes the power generation device to supplement the power corresponding to the difference between the first command value and the minimum target command value or the power corresponding to the difference between the first command value and the maximum target command value. According to this configuration, control can be performed in accordance with the operating conditions of the power generation device and / or the demand device.

[0020] The command value generation unit included in the adjustment device of the power system, which is one aspect, may output the minimum target command value or the maximum target command value to the demand device. The command value generation unit may output a complementary command value that causes the energy storage device to supplement the power corresponding to the difference between the first command value and the minimum target command value or the power corresponding to the difference between the first command value and the maximum target command value. According to this configuration, control can be performed in accordance with the operating conditions of the power generation device and / or the demand device.

[0021] Yet another aspect of the present disclosure is an adjustment device for a power system. The power system includes a renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device having adjustable consumed power, an energy storage device having a second responsiveness equal to or higher than the first responsiveness and storing received power and outputting the stored power, and a power consumer including equipment that consumes the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the energy storage device. The adjustment device for the power system includes a target presentation unit that indicates a target power, and a power acquisition unit that obtains the power output by the renewable energy power generation device and the power consumed by the power consumer, and a command value generation unit that generates a first command value and a second command value such that the combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device and / or the power consumed by the demand device, the power output or consumed by the energy storage device, and the power consumed by the power consumer approaches the target power. The combined power includes a long- and medium-period component including a first fluctuation component and a short-period component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. The command value generation unit generates a first command value corresponding to the long- and medium-period component using the power output by the renewable energy power generation device, the power consumed by the power consumer, and the target power, and generates a second command value corresponding to the short-period component using the combined power and the target power.

[0022] The above power system adjustment device generates a first command value corresponding to the long- and medium-term components by using the power output by the renewable energy power generation device, the power consumed by the power consumers, and the target power. According to this configuration, it is possible to obtain the sustainability of continuously adjusting the power. The above power system adjustment device generates a second command value corresponding to the short-term component by using the combined power and the target power. According to this configuration, it is possible to obtain a power adjustment speed that can immediately absorb the power based on unstable renewable energy before it flows into the power grid. That is, immediate responsiveness can be obtained. As a result, the above power system adjustment device can achieve both immediate responsiveness and sustainability.

[0023] Hereinafter, embodiments for implementing the present disclosure will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and redundant descriptions are omitted.

[0024] FIG. 1 is an example of a power system to which an energy management system, which is a power system adjustment device of the present disclosure, is applied. The energy management system is hereinafter referred to as EMS1. The power system shown in FIG. 1 is also called a microgrid 2. The microgrid 2 includes a solar power generation system 21, power consumers 22, a hydrogen production system 23A (demand device), a hydrogen storage system 23B, a battery system 24, a power generation system 25, a transmission power measurement unit 26A, and a reception power measurement unit 26B. The microgrid 2 is connected to an external power grid 3. The microgrid 2 can transmit power to the power grid 3. The microgrid 2 can also receive power from the power grid 3.

[0025] The solar power generation (PV) system 21, which is a renewable energy device, includes solar panels 211 and a power conditioner 212 (PV-PCS). The power conditioner 212 converts DC power into AC power.

[0026] The renewable energy devices included in the microgrid 2 to which the EMS1 of the present disclosure is applied are not limited to the solar power generation system 21. For example, the renewable energy device may be a wind power generation system or a geothermal power generation system. The renewable energy device may also be a biomass power generation system or a waste power generation system. The EMS1 of the present disclosure is also applicable to a microgrid 2 including an energy system without a generator.

[0027] The EMS1 of the present disclosure has the effect of suppressing disturbance factors with respect to the received and transmitted power. The disturbance factor is a variable factor of renewable energy. Therefore, the EMS1 of the present disclosure can be suitably used for a renewable energy device with a fluctuating output. For example, the power generation amount of the solar power generation system 21 fluctuates violently due to the influence of meteorological conditions such as solar radiation, temperature, and snowfall. For example, the power generation amount of the wind power generation system fluctuates due to the influence of wind speed. The power generation amounts of the biomass power generation system and the waste power generation system fluctuate due to the influence of the properties of the raw materials. For example, the properties of waste such as biomass, waste, and sludge are generally unstable. The power generation amounts of the biomass power generation system and the waste power generation system are not stable due to the temporary mixing of unsuitable incineration materials, etc.

[0028] For the above reasons, the EMS1 of the present disclosure is also applicable to the control of the microgrid 2 including a wind power generation system, a biomass power generation system, and a waste power generation system as renewable energy devices.

[0029] The power consumer 22 is a set of equipment groups that consume power. Examples of the equipment that consumes power include the server and display that constitute the EMS1 that controls the microgrid 2. The equipment that consumes power includes air conditioning equipment. The equipment that consumes power includes auxiliary machines such as a hydrogen compressor, an air compressor, and a cooling tower that constitute the hydrogen production system 23A and the hydrogen storage system 23B. The equipment that consumes power includes security devices such as lighting equipment or surveillance cameras inside the facility. The power consumption of the power consumer 22 is the sum of the power consumed by these equipment.

[0030] The power consumer 22 may include low-voltage consumers such as ordinary households. The EMS 1 can monitor the power consumption of the power consumer 22. On the other hand, the EMS 1 cannot control the power consumption of the power consumer 22.

[0031] The hydrogen production system 23A produces hydrogen by electrolyzing water. Generally, there are PEM (proton exchange membrane) type water electrolysis methods and alkaline water electrolysis methods for water electrolysis. The hydrogen production system 23A may be a device that employs the PEM (proton exchange membrane) type water electrolysis method. The hydrogen production system 23A may be a device that employs the alkaline water electrolysis method.

[0032] The hydrogen storage system 23B stores the hydrogen produced by the hydrogen production system 23A. The hydrogen stored in the hydrogen storage system 23B is filled into a girdle or a hydrogen trailer by, for example, a hydrogen compressor. Thereafter, the filled hydrogen may be transported to the hydrogen demand site. The filled hydrogen may be supplied to a fuel cell vehicle (FCV) locally via a dispenser. The latter is called an on-site hydrogen station. The hydrogen storage system 23B may supply hydrogen to another hydrogen demand site through a pipeline. In any form of utilization, hydrogen goes out from the microgrid 2 by transportation or the like. In this specification, the hydrogen storage system will not be referred to any further.

[0033] The microgrid 2 to which the EMS 1 of the present disclosure is applied may additionally include a power consumption device different from the hydrogen production system 23A and the hydrogen storage system 23B. The microgrid 2 to which the EMS 1 of the present disclosure is applied may include a power consumption device different from the hydrogen production system 23A and the hydrogen storage system 23B in place of them. For example, the microgrid 2 may include an electric boiler in place of the hydrogen production system 23A. The microgrid 2 may include a steam accumulator in place of the hydrogen storage system 23B.

[0034] The battery system 24 includes a device capable of storing energy. The battery system 24 is an energy storage device. Examples of the device capable of storing energy include secondary batteries such as lithium-ion batteries, lead-acid batteries, or redox flow batteries. Examples of the device capable of storing energy also include flywheels, compressed air energy storage (CAES) facilities, or large-capacity capacitors. Generally, the response speed of the battery system 24 is faster than that of the water electrolyzer included in the hydrogen production system 23A. The response speed of the battery system 24 can be regarded as substantially the same as that of a demand device such as an electric boiler. It can be said that the response speed of the battery system 24 is equivalent to that of a demand device such as an electric boiler. Note that "the response speeds are equivalent" or "equivalent responsiveness" does not require that the values indicating the response speed or responsiveness exactly match. That the responsiveness of the demand device and the energy storage device is equivalent can be defined as that the values indicating the responsiveness of the demand device and the values indicating the responsiveness of the energy storage device are within an allowable range that can be set based on various grounds. For example, the allowable range can also be set based on the range that does not significantly affect the control executed by the EMS1. The battery system 24 includes not only the battery but also a device for converting the direct current of the battery into alternating current and a device for monitoring the remaining amount of the battery.

[0035] The power generation system 25 can control the generated power in response to a command value (u_GR) issued from the EMS1. The solar power generation system 21 cannot specify the generated power according to a command value issued from the EMS1. The power generation system 25 is different from the above-described solar power generation system 21 in that the EMS1 can specify the generated power.

[0036] Examples of the power generation system 25 include, for example, gas engines, gas turbines, or diesel engines. When the hydrogen generated in the microgrid 2 is referred to as so-called CO 2 free hydrogen, a power generation system using a non-fossil fuel is suitable for the power generation system 25. Examples of the power generation system using a non-fossil fuel include, for example, CO 2A fuel cell using free hydrogen can be exemplified. In this case, the hydrogen in the hydrogen storage system 23B may be used as fuel.

[0037] The microgrid 2 to which the EMS1 of the present disclosure is applied does not have the power generation system 25 as an essential component. The EMS1 of the present disclosure is also applicable to the control of the microgrid 2 without the power generation system 25. The microgrid 2 to which the EMS1 of the present disclosure is applied is applicable to a configuration including a power consumption device and a storage battery. The microgrid 2 is also applicable to a configuration including a power generation device and a storage battery. The microgrid 2 is also applicable to a configuration including a power consumption device, a power generation device, and a storage battery.

[0038] The connection part 27 distributes electric power to each system constituting the microgrid 2. The electric power distributed by the connection part 27 may include the electric power received from the power grid 3 in addition to the electric power generated by the solar power generation system 21 or the like constituting the microgrid 2. The connection part 27 is, for example, a distribution board.

[0039] The received power measurement unit 26B measures the received power received from an external system (power grid). The transmitted power measurement unit 26A measures the transmitted power provided to an external system (power grid). The renewable energy power measurement unit 26C measures the power output by the solar power generation system 21, which is a renewable energy power generation system. The customer consumption power measurement unit 26D measures the consumption power consumed by the power customer 22. The received power measurement unit 26B, the transmitted power measurement unit 26A, the renewable energy power measurement unit 26C, and the customer consumption power measurement unit 26D are collectively referred to as the power measurement unit 26.

[0040] EMS1 uses the received and transmitted power as the control quantity. Therefore, it is desirable that the sampling periods of the received power measurement unit 26B and the transmitted power measurement unit 26A be equal to or faster than the response speed of the battery system 24. For example, it is desirable that the sampling periods of the received power measurement unit 26B and the transmitted power measurement unit 26A be in milliseconds. On the other hand, the sampling periods of the renewable energy power measurement unit 26C and the customer power consumption measurement unit 26D may be slower than the sampling periods of the received power measurement unit 26B and the transmitted power measurement unit 26A. The sampling periods of the renewable energy power measurement unit 26C and the customer power consumption measurement unit 26D may be, for example, 1 second or more. The sampling period may be 10 seconds or less. The power measured by the renewable energy power measurement unit 26C and the power measured by the customer power consumption measurement unit 26D are used for the feedforward control of the hydrogen production system 23A and the power generation system 25 with relatively slow responses.

[0041] Figure 2 is a functional block diagram of EMS1. Figure 2 shows only the functions related to power control that are necessary for explaining the functions of the EMS1 of the present disclosure. Therefore, other functions of EMS1 are not shown. For example, the database function and the demand monitoring function, which are functions of EMS1, are not shown.

[0042] EMS1 includes a command value generation unit 11, an operation unit 121, and an external communication unit 122. The target values (r_SYS) of the received and transmitted power and the target value (r_SOC) of the battery remaining amount used by the command value generation unit 11 are given from above. For example, the target values are input from the operation unit 121 (monitor / keyboard, etc.) by the plant operator. The target values may be given via communication from an external power utility or resource aggregator 4. Based on the given target values, the command value generation unit 11 outputs command values to the power generation system 25, the battery system 24, and the hydrogen production system 23A. Various information necessary for plant control can be obtained from the battery system 24 or the power measurement unit 26.

[0043] EMS1 includes a command value generation unit 11, a target presentation unit 12, and a power acquisition unit 13. The target presentation unit 12 corresponds to the operation unit 121 and / or the external communication unit 122. The power acquisition unit 13 is connected to the power measurement unit 26. The power acquisition unit 13 obtains power information necessary for control from the power measurement unit 26. The acquisition of power information performed by the power acquisition unit 13 includes the operation of obtaining the power itself. The acquisition of power information performed by the power acquisition unit 13 includes the operation of obtaining information different from the power that can estimate the power and estimating the power from the different information. The acquisition of power information performed by the power acquisition unit 13 includes the operation of obtaining a value obtained by calculation or estimation based on indirect information for estimating the power. The information obtained by the power acquisition unit 13 may be a measured value of the power directly measured by the power measurement unit 26. The information obtained by the power acquisition unit 13 may be indirect information for estimating the power. The information obtained by the power acquisition unit 13 may be a value obtained by calculation or estimation based on indirect information for estimating the power.

[0044] For example, the power acquisition unit 13 may obtain a measured value of the power output by the renewable energy power generation device. The power acquisition unit 13 may obtain indirect information for estimating the value of the power output by the renewable energy power generation device. The indirect information for estimating the value of the power is, for example, the sunshine duration. In this case, the power acquisition unit 13 may estimate the generated power output by the photovoltaic power generation system 21 using the information obtained from the pyranometer and the thermometer. The power acquisition unit 13 may obtain a value of the power estimated from the indirect information for estimating the value of the power output by the renewable energy power generation device. The power acquisition unit 13 may obtain an estimated value by executing the operation of estimating the power by itself. The power acquisition unit 13 may execute the operation of estimating the power by an element different from the power acquisition unit 13 and obtain a calculated value obtained by the operation of the different element. The "power output by the renewable energy power generation device" described in the claims may include a measured value of the power directly obtained by measurement, an estimated value of the power obtained using indirect information for estimating the value of the power, and a calculated value of the power obtained using indirect information for calculating the value of the power.

[0045] The power acquisition unit 13 may obtain the measured value of the power consumed by the power consumer 22. The power acquisition unit 13 may obtain indirect information for estimating the value of the power consumed by the power consumer 22. The power acquisition unit 13 may obtain the value of the power estimated from the indirect information for estimating the value of the power consumed by the power consumer 22. For example, when there are a plurality of power consumers 22, the total power consumed by the plurality of power consumers 22 may be measured by one power measurement unit. The power acquisition unit 13 may obtain the one total power. For example, when there are a plurality of power consumers 22, the individual power consumed by each of the plurality of power consumers 22 may be measured by a plurality of power measurement units. The power acquisition unit 13 may obtain the plurality of individual powers and perform an operation of adding them together to obtain the total power consumed by the plurality of power consumers 22. The operation of obtaining the plurality of individual powers and adding them together to obtain the total power may be executed by an element separate from the power acquisition unit 13, and the power acquisition unit 13 may obtain the calculation result of the operation. The "power consumed by the demand device" described in the claims may include the measured value of the power directly obtained by measurement, the estimated value of the power obtained by using indirect information for estimating the value of the power, and the calculated value of the power obtained by using indirect information for calculating the value of the power.

[0046] In short, the power acquisition unit 13 may obtain an estimated value by executing the operation of estimating the power by itself. The power acquisition unit 13 may obtain the calculated value obtained by the operation of the other element where the operation of estimating the power is executed by an element separate from the power acquisition unit 13.

[0047] The command value generation unit 11 generates several command values to be provided to the hydrogen production system 23A, the power generation system 25, and the battery system 24. The command value generation unit 11 includes a feedforward control unit 111, a command value correction unit 112, and a feedback control unit 113. The feedforward control unit 111 generates a command value (u_EC) to be provided to the hydrogen production system 23A and a command value (u_GR) to be provided to the power generation system 25. The command value correction unit 112 corrects the load command value (v_FF) in consideration of the state of the battery system 24. The feedback control unit 113 generates a command value (u_BAT) to be provided to the battery system 24.

[0048] The control content of the command value generation unit 11 will be described in more detail. FIG. 3 shows a block diagram of the command value generation unit 11. The symbols in the figure are as follows.

[0049] [Input signal from the upper level] r_SOC: Target value of battery remaining capacity (SOC) [%]. r_SYS: Target value of power reception and transmission power [kW] (power reception is positive, power transmission is negative). [Input signal from the power measurement unit]. y_SYS: Measured value of power reception and transmission power [kW] (power reception is positive, power transmission is negative). d_(PV_est): Measured value (or estimated value) of photovoltaic power generation power [kW]. d_(LD_est): Measured value (or estimated value) of power consumption of power consumers [kW]. [Input signal from the battery system] y_SOC: Current battery remaining capacity (SOC) [%]. [Output signal of the control unit] u_EC: Consumption power command value for the hydrogen production system [kW] (always positive). u_GR: Power generation power command value for the power generation system [kW] (always positive). u_BAT: Charge / discharge power command value for the battery system [kW] (charging is positive, discharging is negative). [Signal on the plant side] y_EC: Consumption power of the hydrogen production system [kW]. y_GR: Power generation of the power generation system [kW]. y_BAT: Charge / discharge power of the battery system [kW] (charging is positive and discharging is negative). d_PV: Photovoltaic power generation [kW]. d_LD: Power consumption of the power consumer [kW]. [Parameters inside the controller] Kp_SOC: Gain for SOC control [kW / %].

[0050] There is one power consumer shown in the figure. However, in reality, it is associated with multiple feeder powers, and it may be difficult to measure the power consumption of the consumer at a single location. In that case, the power consumption of the consumer may be calculated by adding, subtracting, or a combination of addition and subtraction of multiple power measurement values. For example, consider that the power A output by one power supply device is distributed to power B, power C, power D, and power E. And assume that power C, power D, and power E are the powers consumed by the power consumer. In this case, the power consumed by the consumer can be obtained by addition such as power C + power D + power E. The power consumed by the consumer can also be obtained by subtraction such as power A - power B. If there is a consumer whose power consumption is difficult to measure but stable, in the above calculation, the power consumption of that consumer may be treated as a constant value. If it is determined that the power consumption is negligible, the constant value may be 0.

[0051] As shown in FIG. 3, the command value generation unit 11 is roughly divided into three calculation parts.

[0052] The first calculation part is the feedforward control unit 111.

[0053] The feed-forward control unit 111 outputs a load command value (v_FF) to the power generation system 25 and the hydrogen production system 23A by using the estimated value of the power output by the photovoltaic power generation system 21 (d_(PV_est)), the estimated value of the power consumed by the power consumer 22 (d_(LD_est)), and the target value of the power received and transmitted (r_SYS). When the sign of the load command value (v_FF) is positive, it means consumption. When the sign of the load command value (v_FF) is negative, it means power generation. The command value generation unit 11 generates a command value without using the control quantity y_SYS. That is, a so-called feedback loop is not formed.

[0054] The feed-forward control unit 111 includes a smoothing filter 111a. The smoothing filter 111a functions to smooth the command value (v_FF) with respect to the power output by the photovoltaic power generation system 21, the power consumed by the power consumer 22, and the variation of the target value of the power received and transmitted.

[0055] Generally, the efficiency of the electrolyzer provided in the hydrogen production system 23A and the generator provided in the power generation system 25 decreases when the change in the operating state is severe. As a result, the physical burden on the equipment also increases. Therefore, it is desirable that the variation of the load command value (v_FF) be as gentle as possible. As the smoothing filter 111a, a low-pass filter such as a moving average or a first-order lag filter may be used. The smoothing filter 111a belongs to the feed-forward system. Therefore, the load command value (v_FF) does not become unstable.

[0056] The feed-forward control unit 111 includes a distribution element 111b. The distribution element 111b distributes the load command value (v_FF) to the command value (u_EC) for the hydrogen production system 23A or the command value (u_GR) for the power generation system 25 according to the positive or negative sign of the load command value (v_FF). When the sign of the load command value (v_FF) is positive, it means adjustment on the consumption side. Therefore, the feed-forward control unit 111 outputs the command values (u_EC = v_FF, u_GR = 0). When the sign of the load command value (v_FF) is negative, it means adjustment on the power generation side. Therefore, the feed-forward control unit 111 outputs the command values (u_EC = 0, u_GR = -v_FF).

[0057] The second calculation part is the feedback control unit 113.

[0058] The feedback control unit 113 calculates the charge / discharge power (u_BAT) using the measured value (y_SYS) of the received / sent power and the target value (r_SOC). The command value correction unit 112 constitutes the feedback control system.

[0059] The estimated value (d_(PV_est)) and / or the estimated value (d_(LD_est)) may deviate from the actual value. The fluctuations in the power output by the photovoltaic power generation system 21, the fluctuations in the power consumed by the power consumer 22, and the fluctuations in the target value (r_SYS) of the received / sent power may exceed the load following performance of the water electrolyzer in the hydrogen production system 23A and / or the load following performance of the power generation system. For these reasons, the feed-forward control executed by the feed-forward control unit 111, which is the first calculation part, may not be sufficient to achieve sufficient follow-up performance of the received / sent power.

[0060] Therefore, feedback control is performed by the battery system 24 with a fast response speed. When the error of the estimated value described above can be ignored, the charge / discharge power becomes 0 kW in the steady state due to the effect of feedforward control. Similarly, when the fluctuations in the power output by the solar power generation system 21, the fluctuations in the power consumed by the power consumer 22, and the fluctuations in the target value (r_SYS) of the received / sent power can be regarded as constant values, the charge / discharge power becomes 0 kW in the steady state due to the effect of feedforward control. In the battery system 24 where there are energy losses due to charge / discharge and the battery capacity is limited, this characteristic is desirable.

[0061] Summarizing the explanations so far, the fluctuations in the power output by the solar power generation system 21, the fluctuations in the power consumed by the power consumer 22, and the fluctuations in the target value (r_SYS) of the received / sent power include long-period fluctuation components and short-period fluctuation components. And the response to long-period fluctuations is assigned to the hydrogen production system 23A and / or the power generation system 25. The response to short-period fluctuations is assigned to the battery system 24.

[0062] The third calculation part is the command value correction unit 112.

[0063] The command value correction unit 112 corrects the load command value (v_FF) based on the SOC of the battery system 24 to keep it within an appropriate range and the SOC target value (r_SOC). The command value correction unit 112 includes a correction element 112b. The correction element 112b subtracts the correction command value (v_SOC) from the load command value (v_FF). This operation has two meanings. First, when the SOC is higher than the target value (r_SOC) of the SOC, it means increasing the power consumption of the hydrogen production system 23A. Second, it means performing a correction to reduce the power generation of the power generation system 25. In other words, when the SOC is lower than the target value (r_SOC), the power consumption of the hydrogen production system 23A is reduced or the power generation of the power generation system is increased.

[0064] As described above, the battery system 24 performs feedback control. Therefore, by correcting the loads of the hydrogen production system 23A and / or the power generation system 25, the battery system 24 can restore the remaining amount of the battery to an appropriate range.

[0065] [Hardware Configuration] Referring to FIG. 4, the hardware configuration of the EMS1 will be described. FIG. 4 is a diagram showing an example of the hardware configuration of the EMS1. The EMS1 includes one or more computers 100. The computer 100 has a CPU (Central Processing Unit) 101, a main storage unit 102, an auxiliary storage unit 103, a communication control unit 104, an input device 105, and an output device 106. The EMS1 is composed of one or more computers 100 configured by these hardware and software such as programs.

[0066] When the EMS1 is composed of a plurality of computers 100, these computers 100 may be locally connected or connected via a communication network such as the Internet or an intranet. With this connection, a logically single EMS1 is constructed.

[0067] The CPU 101 executes an operating system, application programs, etc. The main storage unit 102 is composed of a ROM (Read Only Memory) and a RAM (Random Access Memory). The auxiliary storage unit 103 is a storage medium composed of a hard disk, a flash memory, etc. The auxiliary storage unit 103 generally stores a larger amount of data than the main storage unit 102. The communication control unit 104 is composed of a network card or a wireless communication module. The input device 105 is composed of a keyboard, a mouse, a touch panel, a microphone for voice input, etc. The output device 106 is composed of a display, a printer, etc.

[0068] The auxiliary storage unit 103 stores in advance a program 110 and data necessary for processing. The program 110 causes the computer 100 to execute each functional element of the EMS1. For example, the program 110 is read by the CPU 101 or the main storage unit 102 and operates at least one of the CPU 101, the main storage unit 102, the auxiliary storage unit 103, the communication control unit 104, the input device 105, and the output device 106. For example, the program 110 reads and writes data in the main storage unit 102 and the auxiliary storage unit 103.

[0069] The program 110 may be provided after being recorded on a tangible recording medium such as a CD-ROM, a DVD-ROM, or a semiconductor memory. The program 110 may be provided as a data signal via a communication network.

[0070] [Operational Effects] The operational effects of the power system adjustment device and the power system adjustment program of the present disclosure will be described. Before describing the operational effects, the problems of the prior art exemplified as Patent Documents 1 to 4 will be described.

[0071] It has already been described that a power system including a P2G system is required to have sustainability and responsiveness. In particular, responsiveness is also important from the viewpoint of free hydrogen production. In a system with low responsiveness, when the power output by a renewable energy device suddenly decreases, there is a risk that the power from the power grid will be consumed by the water electrolysis device. Unless the grid power is 2 free power, the hydrogen produced by the aforementioned equipment cannot be called free hydrogen. However, in general, it is known that a contract for free grid power has a higher electricity charge than a general power contract. 2 2 2

[0072] ​​​As described in paragraph 0052 of Patent Document 1, the technology disclosed in Patent Document 1 first charges the storage battery when surplus power exists. When the SOC (State Of Charge), which is an indicator of the remaining capacity of the battery, exceeds a certain threshold value, the water electrolysis device included in the hydrogen production device is operated. Exceeding a certain threshold value means that the storage battery is fully charged. In such a so-called if-then logic, when the capacity of the storage battery is small, the storage battery will quickly become fully charged. That is, in almost all cases, as shown in step S112 of FIG. 2 in Patent Document 1, surplus power must be consumed by hydrogen production. However, as already described, a single water electrolysis device cannot completely absorb the fluctuations in the generated power of variable renewable energy such as solar power generation. That is, it is difficult to control the received and transmitted power from the perspective of the device performance.

[0073] The technology disclosed in Patent Document 2 focuses on the delay in the responsiveness of the hydrogen production facility. As disclosed in paragraph 0007 of Patent Document 2, the technology disclosed in Patent Document 2 makes the input power to the hydrogen production facility match the target value before the start time of the demand response. However, during the start of the demand response, that is, during the power adjustment, it is expected that the generated power of the adjacent renewable energy device or the renewable energy device included in the microgrid will fluctuate. Therefore, it is also as difficult to control the received and transmitted power by the technology disclosed in Patent Document 2 as in Patent Document 1.

[0074] The technology disclosed in Patent Document 3 controls the received and transmitted power with the power grid using only a storage battery. When applying the technology disclosed in Patent Document 3 to the above-mentioned P2G system, the capacity of the storage battery must be made sufficiently large. The adoption of a large-capacity storage battery leads to an increase in the purchase cost and maintenance cost, which is not desirable. Therefore, the technology disclosed in Patent Document 3 has a problem in sustainability.

[0075] The technology disclosed in Patent Document 4 attempts to consume the power of solar power generation using only a water electrolysis device with relatively low responsiveness. Therefore, the technology disclosed in Patent Document 4 has a problem from the perspective of immediate responsiveness. In fact, referring to FIG. 5 of Patent Document 4, it can be seen that the power consumption of the water electrolysis device fluctuates violently due to the fluctuations in the power of solar power generation. When such operation is performed, it is expected that a problem will occur in that the efficiency of the water electrolysis device deteriorates. Furthermore, it is assumed that a problem will occur in that the power supplied to the water electrolysis device includes power other than solar power generation. The technology disclosed in Patent Document 4 performs control based on a threshold value with respect to the distribution power. As a result, in the technology disclosed in Patent Document 4, the power consumption command value is likely to be a discontinuous signal.

[0076] The EMS1, which is an adjustment device for the power system of the present disclosure, solves the problems of the technologies disclosed in the above Patent Documents 1 to 4 with the following configuration.

[0077] The microgrid 2 includes a solar power generation system 21 that generates power using renewable energy, a power generation system 25 having a first responsiveness and adjustable output power, a hydrogen production system 23A with adjustable power consumption, a battery system 24 having a second responsiveness equal to or greater than the first responsiveness and storing and outputting the received power, and a power consumer 22 that consumes the power output by the solar power generation system 21, the power output by the power generation system 25, and the power output by the battery system 24. The EMS 1 applied to the microgrid 2 includes a target presentation unit 12 that indicates a target power, a power acquisition unit 13 that obtains a combined power obtained by adding the power output by the solar power generation system 21, the power output by the power generation system 25, the power consumed by the hydrogen production system 23A, the power output or consumed by the battery system 24, and the power consumed by the power consumer 22, and a command value generation unit 11 that outputs a first command value and a second command value such that the combined power approaches the target power. The combined power includes a long- and medium-period component including a first fluctuation component and a short-period component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. The command value generation unit 11 outputs a first command value corresponding to the long- and medium-period component to the power generation system 25 and / or the hydrogen production system 23A, and outputs a second command value corresponding to the short-period component to the battery system 24.

[0078] In other words, EMS1 controls the microgrid 2 that owns the solar power generation system 21, the power consumer 22, the battery system 24, the power generation system 25, and the hydrogen production system 23A and can exchange energy with the outside. EMS1 controls the charge and discharge power of the battery system 24, the power consumption of the hydrogen production system 23A, and the power generation of the power generation system 25 so that the upstream power where the generated power of the solar power generation system 21, the output power of the battery system 24, the consumed power of the power consumer 22, the consumed power of the hydrogen production system 23A, and the generated power of the power generation system 25 converge becomes a desired target value (r_SYS). EMS1 responds to the generated power of the solar power generation system 21, the target value (r_SYS) of the above-mentioned upstream power, and the fluctuations in the consumed power of other connected power consumers. The long and medium-term component power of the fluctuation component is handled by the hydrogen production system 23A and the power generation system 25, while the short-term component power is handled by the battery system 24.

[0079] Regarding the fluctuations in the combined power including the power based on renewable energy, the above-mentioned EMS1 makes the power generation system 25 and the hydrogen production system 23A bear the long and medium-term components. According to this configuration, it is possible to obtain the sustainability of continuously adjusting the power. EMS1 makes the battery system 24 bear the short-term component. According to this configuration, it is possible to obtain a power adjustment speed that can immediately absorb the power based on unstable renewable energy before it flows into the power grid 3. Therefore, responsiveness can be obtained. As a result, EMS1 can achieve both responsiveness and sustainability.

[0080] EMS1 improves the system's responsiveness by combining the water electrolyzer included in the hydrogen production system 23A, which is a power-consuming device, with a small-capacity storage battery. EMS1 performs feedforward control on the hydrogen production system 23A, which is a power-consuming device, using the generated power of the solar power generation system 21, the power consumption of the power consumer 22, and the target value (r_SYS) of the power reception / supply power. EMS1 performs feedback control on the battery system 24 using the power reception / supply power and the target value (r_SYS) of the power reception / supply power. By these controls, the long-period fluctuation component and the medium-period fluctuation component of the renewable energy can be consumed by the hydrogen production system 23A. Furthermore, the short-period fluctuation component of the renewable energy can be absorbed by the battery system 24.

[0081] A configuration is assumed in which both the hydrogen production system 23A including the water electrolyzer and the battery system 24 are controlled by feedback control using the power reception / supply power and the target value (r_SYS) of the power reception / supply power. This control system corresponds to the design of a one-input two-output controller. Generally, for a control system with one input and two outputs, the design of the stability of the closed-loop system and the like is complicated. However, the EMS1 of the present disclosure combines feedforward control and one-input one-output feedback control. Therefore, the design of each control system is easy. Also, adjustment is easy. For example, a PID controller, which is generally well known as a one-input one-output feedback controller, can be used for the feedback control unit 113.

[0082] The power acquisition unit 13 included in the EMS1 further acquires the power output by the solar power generation system 21 and the power consumed by the power consumer 22. The command value generation unit 11 generates a first command value corresponding to the long- and medium-term components by using the power output by the solar power generation system 21, the power consumed by the power consumer 22, the power output or consumed by the battery system 24, and the target power. The command value generation unit 11 generates a second command value corresponding to the short-term component by using the combined power and the target power. According to this configuration, the EMS1 can generate a first command value that realizes the required sustainability. The EMS1 can also generate a second command value that realizes the required power adjustment speed.

[0083] In other words, based on the generated power of the solar power generation system 21, the above-described target value (r_SYS) of the upstream power, and the power consumed by the power consumer 22, the EMS1 determines a power generation command value for the power generation system 25 and a load power command value for the hydrogen production system 23A. The EMS1 determines a command value for the charge / discharge power of the battery system 24 based on the above-described upstream power and the target value (r_SYS) of the upstream power.

[0084] The power acquisition unit 13 included in the EMS1 further acquires the power stored in the battery system 24. The target presentation unit 12 further indicates a target stored energy value, which is the target value of the power stored in the battery system 24. The command value generation unit 11 generates the second command value so that the remaining amount of the power stored in the battery system 24 asymptotically approaches the target stored energy value. According to this configuration, the remaining amount of the power stored in the battery system 24 can be asymptotically approached to a desired amount.

[0085] In other words, when the remaining amount of the battery system 24 is low, EMS1 corrects the command value so as to increase the generated power of the power generation system 25. When the remaining amount of the battery system 24 is low, EMS1 corrects the command value so as to decrease the load power of the hydrogen production system 23A. Conversely, when the remaining amount of the battery system 24 is high, EMS1 corrects the command value so as to decrease the generated power of the power generation system 25. When the remaining amount of the battery system 24 is high, EMS1 corrects the command value so as to increase the load power of the hydrogen production system 23A. As a result, the remaining amount of the battery system 24 can be made to approach a desired amount. Thereby, the sustainability of the P2G system can be improved.

[0086] Conventionally, a large-capacity battery has been required for power adjustment. According to EMS1, power can be controlled by a small-scale battery. Batteries are expensive. Generally, the price of a battery tends to be proportional to the battery capacity. Therefore, since this technology enables power control using a small-scale battery, it is useful in terms of cost.

[0087] The above technology maintains the remaining amount of the battery system 24 by introducing feedback control. As a result, overcharging and / or over-discharging of the battery system 24 can be prevented. When overcharging and / or over-discharging occurs, the battery system 24 needs to stop operating. When the operation of the battery system 24 stops, the ability to adjust the power of the P2G system decreases. When the operation of the battery system 24 stops, the ability to adjust the power of the P2G system is lost. According to EMS1, a decrease and loss of the ability to adjust the power of the P2G system can be suppressed. For the battery system 24, operation that avoids overcharging and / or over-discharging states is possible. For example, it is known that in the case of a lithium-ion battery, if over-discharge or over-charge states continue, the performance degradation of the battery accelerates. That is, in the battery system 24 equipped with a lithium-ion battery, an effect of reducing the degradation of the battery performance can be expected.

[0088] The microgrid 2 includes a solar power generation system 21 that generates power using renewable energy, a power generation system 25 having a first responsiveness and adjustable output power and / or a hydrogen production system 23A with adjustable power consumption, a battery system 24 having a second responsiveness equal to or higher than the first responsiveness and storing the received power and outputting the stored power, and a power consumer 22 that consumes the power output by the solar power generation system 21, the power output by the power generation system 25, and the power output by the battery system 24. The EMS 1 applied to the microgrid 2 includes a target presentation unit 12 that indicates a target power, and a power acquisition unit 13 that obtains the power output by the solar power generation system 21, the power consumed by the power consumer 22, and the power output or consumed by the battery system 24. The EMS 1 also includes a command value generation unit 11 that outputs a first command value and a second command value such that the combined power obtained by adding the power output by the solar power generation system 21, the power consumed by the power consumer 22, and the power output or consumed by the battery system 24 approaches the target power. The command value generation unit 11 generates a first command value corresponding to a long- and medium-term component using the power output by the solar power generation system 21, the power consumed by the power consumer 22, the power output or consumed by the battery system 24, and the target power, and generates a second command value corresponding to a short-term component using the combined power and the target power.

[0089] In other words, EMS1 controls the microgrid 2 that owns the photovoltaic power generation system 21, the battery system 24, the power generation system 25, and the hydrogen production system 23A and can exchange energy with the outside. EMS1 controls the charge and discharge power of the battery system 24, the power consumption of the hydrogen production system 23A, and the power generation power of the power generation system 25 so that the upstream power where the power generation power of the photovoltaic power generation system 21, the output power of the battery system 24, the power consumption of the hydrogen production system 23A, and the power generation power of the power generation system 25 converge becomes a desired target value (r_SYS). EMS1 determines a command value (u_GR) for the power generation system 25 and a command value (u_EC) for the hydrogen production system 23A based on the power generation power of the photovoltaic power generation system 21, the target value (r_SYS) of the upstream power described above, and the power consumption of the power consumer 22. Further, EMS1 determines a command value (u_BAT) for controlling the charge and discharge of the battery system 24 based on the upstream power and the target value (r_SYS) of the upstream power.

[0090] EMS1 applied to the above microgrid 2 generates a first command value corresponding to the long- and medium-term components using the power output by the photovoltaic power generation system 21, the power consumed by the power consumer 22, the power output or consumed by the battery system 24, and the target power. According to this configuration, it is possible to obtain the persistence of continuously adjusting the power. EMS1 of the above microgrid 2 generates a second command value corresponding to the short-term component using the combined power and the target power. According to this configuration, it is possible to obtain a power adjustment speed that can immediately absorb the power based on unstable renewable energy before it flows into the power grid. That is, immediate responsiveness can be obtained. As a result, EMS1 can achieve both immediate responsiveness and persistence.

[0091] [Premises of the simulation] Hereinafter, the operation of EMS1 will be verified through simulation. The performance of each device constituting the microgrid 2 was determined as follows. Output power of the photovoltaic power generation system 21: Rated 1000 kW. Output power of hydrogen production system 23A: Rated 1000 kW. Output power of power generation system 25: Rated 1000 kW. Performance of the storage battery: Capacity 500 kWh, charge / discharge power ±500 kW. Time constant of storage battery system 24: 0.01 sec. Time constant of hydrogen production system 23A: 5 sec. Time constant of power generation system 25: 5 sec.

[0092] The characteristics of the elements constituting EMS1 were defined as follows. Target value of the remaining battery level (r_SOC): Always 50%. Gain (Kp_SOC): 1. Smoothing filter 111a: First-order lag filter. Time constant of smoothing filter 111a: 150 seconds. Sampling period of the measured value (d_(PV_est)) of the power generation of the solar power generation system 21: 1 second. Measured value (d_(LD_est)) of the power consumption of the power consumer 22: 1 second.

[0093] Figure 5 shows the fluctuations in the power generation output by the solar power generation system 21. During the day, the power generation output fluctuates. These fluctuations in power generation are due to the influence of clouds.

[0094] [Example 1] In Example 1, as the target value (r_SYS) of the received and transmitted power, a condition of always transmitting 5 kW was set. It was assumed that the microgrid 2 could not use the power generation system 25. As a condition where the power generation system 25 could not be used, a power generation power command value (u_GR = 0) was set. This setting is equivalent to producing so-called CO-free hydrogen using only the power generated by the renewable energy device provided in the microgrid 2. The power consumption (d_LD) of the power consumer 22 was assumed to be 0 kW. 2 It is equivalent to producing free hydrogen. The power consumption (d_LD) of the power consumer 22 was assumed to be 0 kW.

[0095] Figures 6 and 7 show the results of the simulation of Example 1. Fig. 6(a) shows the charge and discharge power of the battery system 24. Fig. 6(b) shows the power consumption of the hydrogen production system 23A. Referring to Fig. 6(a), it was found that control was performed to supplement short-period components by the battery system 24 with respect to the fluctuations in the power generation of the solar power generation system 21 (see Fig. 5). The fluctuations appearing in the graph shown in Fig. 6(a) correspond to short-period components including the second fluctuation component. The graph of Fig. 6(a) can also be said to show the responsiveness of the battery system 24.

[0096] Referring to Fig. 6(b), it was also found that control was performed to supplement long- and medium-period components by the hydrogen production system 23A with respect to the fluctuations in the power generation of the solar power generation system 21 (see Fig. 5). The fluctuations appearing in the graph shown in Fig. 6(b) correspond to long- and medium-period components including the first fluctuation component. The graph of Fig. 6(b) can also be said to show the responsiveness of the hydrogen production system 23A.

[0097] Comparing Fig. 6(a) and Fig. 6(b), it was found that the graph of Fig. 6(a) fluctuates in a shorter period. It can be seen that the short-period components appearing in the graph shown in Fig. 6(a) contain higher-frequency components than the long- and medium-period components appearing in the graph shown in Fig. 6(b). In other words, it was found that the short-period components appearing in the graph shown in Fig. 6(a) have a shorter period than the long- and medium-period components appearing in the graph shown in Fig. 6(b).

[0098] Comparing Fig. 6(a) and Fig. 6(b), it was found that the graph of Fig. 6(a) fluctuates in a shorter period. As a result, it was also found that the responsiveness (first responsiveness) of the hydrogen production system 23A is higher than the responsiveness (second responsiveness) of the hydrogen production system 23A.

[0099] If the time constant of the smoothing filter 111a is increased, the power consumption of the hydrogen production system 23A can be made smoother. On the other hand, if the time constant of the smoothing filter 111a is increased, the charge / discharge power command value (u_BAT) of the battery system 24 will increase. As a result, there is a risk of exceeding the rating of the battery system 24. The waveform of the command value (u_EC) to the hydrogen production system 23A is almost the same as the waveform in Fig. 6(a). The waveform of the command value (u_BAT) to the battery system 24 is also almost the same as the waveform in Fig. 6(b). Therefore, the illustration of the waveform of the command value (u_EC) to the hydrogen production system 23A and the waveform of the command value (u_BAT) to the battery system 24 are omitted.

[0100] Fig. 7(a) shows the target value (r_SOC) of the remaining amount of the battery system 24. Fig. 7(b) shows the remaining amount (y_SOC) of the battery system 24. Referring to Fig. 7(a) and Fig. 7(b), it can be seen that the battery system 24 is discharging during the time period when the power generation of the solar power generation system 21 is low (from 0:00 to 7:00). Specifically, it can be seen that the battery system 24 is transmitting 5 kW of power. As a result, it can also be seen that the SOC of the battery system 24 is gradually decreasing (see Fig. 7(b)). On the other hand, it can also be seen that the SOC is gradually being restored to an appropriate range by using the power generation of the solar power generation system 21 during the day.

[0101] Fig. 7(c) shows the target value (r_SYS) of the power reception / transmission power. The target value (r_SYS) of the power reception / transmission power is set as a fixed value of -5 kW. Fig. 7(d) shows the power reception / transmission power. Referring to Fig. 7(c) and Fig. 7(d), it can be seen that the power reception / transmission power shown in Fig. 7(d) can be accurately controlled to a constant value with respect to the target value (r_SYS) of the power reception / transmission power shown in Fig. 7(c). It can also be seen that the power reception / transmission power is always on the negative side. This means that power has never been received. Therefore, it can be seen that all the power used in the hydrogen production system 23A is the power generated by the solar power generation system 21. That is, the generated hydrogen is 2 proven to be CO-free hydrogen.

[0102] [Example 2] Figure 8(a) shows the target value (r_SYS) of the received and transmitted power in Example 2. Different from Example 1, in Example 2, mainly the target value (r_SYS) of the received power was given. This assumes the case where the operator or the upper system determines that it is better to produce hydrogen even by purchasing electricity, considering comprehensively the electricity market price, hydrogen price, etc. As shown in the graph of Figure 8(a), the transmission target value switches for about one and a half hours starting from 13:00. This is a setting assuming the occurrence of tight power supply and demand and a demand response from the general power transmission and distribution operator. The target values of the received and transmitted power do not necessarily have to be determined for all 24 hours at 0:00. It is sufficient that the target value at that time is determined.

[0103] Figure 8(b) shows the set value of the power consumption of the power consumer 22. In Example 1, it was assumed that the power generation system 25 of the microgrid 2 was not available. In Example 2, it is assumed that the power generation system 25 can be used.

[0104] Figures 9 and 10 show the results of the simulation in Example 2. Figure 9(a) shows the charge and discharge power of the battery system 24. Figure 9(b) shows the power consumption of the hydrogen production system 23A. Figure 9(c) shows the power generation of the power generation system 25. Referring to Figure 9(a), it can be seen that the battery system 24 performs control to compensate for the high-frequency fluctuations in the power generation of the solar power generation system 21, the power consumption of the power consumer 22, and the target value (r_SYS) of the received and transmitted power. Referring to Figure 9(b), it can be seen that the hydrogen production system 23A performs control to compensate for the low-frequency fluctuations in the power generation of the solar power generation system 21, the power consumption of the power consumer 22, and the target value (r_SYS) of the received and transmitted power. Similarly, referring to Figure 9(c), it can also be seen that the power generation system 25 performs control to compensate for the low-frequency fluctuations in the power generation of the solar power generation system 21, the power consumption of the power consumer 22, and the target value (r_SYS) of the received and transmitted power.

[0105] Referring to FIGS. 9(b) and 9(c), it was also found that during power transmission, the hydrogen production system 23A was stopped and the power generation system 25 was generating power. Since the respective command values are almost the same, the illustration is omitted.

[0106] FIG. 10(a) shows the target value (r_SOC) of the remaining amount of the battery system 24. FIG. 10(b) shows the remaining amount (y_SOC) of the battery system 24. Referring to FIG. 10(b), it was found that the SOC can be maintained within an appropriate range.

[0107] FIG. 10(c) is the target value (r_SYS) of the received and transmitted power. FIG. 10(d) is the received and transmitted power (y_SYS). It was found that the received and transmitted power (y_SYS) shown in FIG. 10(d) can be controlled to accurately follow the target value (r_SYS) shown in FIG. 10(c).

[0108] Generally, when procuring power from the market, if there is a deviation between the planned amount of power and the actual amount of power used, the deviation is separately charged as an imbalance charge. Demand response also needs to meet the specified required accuracy. Therefore, a system equipped with an EMS1 that can achieve accurate received and transmitted power with respect to the target value (r_SYS) does not need to pay a large amount of imbalance charges. By providing adjustment power such as demand response, it is also possible to receive a separate reward. As a result, it becomes possible to further reduce the hydrogen production cost.

[0109] When the microgrid 2 owns both the hydrogen production system 23A and the power generation system 25 and only uses one of them at all times, the equipment operation rate will be low as a whole. Therefore, at first glance, it may seem that it is not economically reasonable for the microgrid 2 to own both the hydrogen production system 23A and the power generation system 25. However, in a specific microgrid, as a disaster countermeasure (BCP response) for the region, a fuel cell that uses hydrogen in the microgrid as an emergency fuel may be provided. In that case, since the fuel cell will only be used during disasters, the operation rate of the fuel cell will be quite low. However, according to the EMS1, it is possible to use the fuel cell as the power generation system 25 described above for power generation during demand response. As a result, the equipment operation rate of the fuel cell can be improved.

[0110] This disclosure is not necessarily limited to the above-described embodiments. Various modifications are possible without departing from the gist thereof.

[0111] [Modification Example 1] As shown in Example 1, the microgrid 2 may include either or both of the power generation device which is the power generation system 25 and the power consumption device which is the hydrogen production system 23A. In this specification, the power generation device such as the power generation system 25 and the power consumption device such as the hydrogen production system 23A are collectively referred to as the power generation and load adjustment capable device. For example, FIG. 11 shows the control block of the command value generation unit 11A included in the EMS when the power generation system 25 is provided but the hydrogen production system 23A is not provided. FIG. 12 shows the control block of the command value generation unit 11B included in the EMS when the hydrogen production system 23A is provided but the power generation system 25 is not provided.

[0112] [Modification Example 2] In the above description, the term "power received and transmitted" is used, but this is not necessarily limited to the power at the contractual liability demarcation point of facilities such as the microgrid 2 or the building. The EMS 1 of the present disclosure controls the power generated by the renewable energy power generation device, the charge / discharge power in the battery system, and the power on the power line upstream of the power generation / load adjustment device.

[0113] [Modification Example 3] The EMS 1 may stop the feedback control for the battery system 24 on the condition that the remaining amount of power stored in the battery system 24 becomes equal to or less than a certain value. The EMS 1 may stop the feedback control for the battery system 24 on the condition that the remaining amount of power stored in the battery system 24 becomes equal to or greater than a certain value.

[0114] [Modification Example 4] The EMS 1 of the present disclosure generates a load command value (v) based on feedforward control and SOC constant control. The EMS 1 of the present disclosure distributes all of the generated load command values (v) to the hydrogen production system 23A and / or the power generation system 25.

[0115] For example, when the load command value (v) becomes a small value near 0, following the sign inversion, the hydrogen production system 23A repeats the operation of producing a small amount of hydrogen and the power generation system 25 repeats the operation of generating a small amount of power alternately. Generally, it is not preferable that the start and stop of equipment are frequently switched. Therefore, on the condition that the magnitude of the load command value (v) is equal to or less than a certain value, the load command value (v) may be distributed to the charge / discharge command value (u_BAT) of the battery system 24 (u_BAT = v + u_BAT). As a result, the load command value (v) of the hydrogen production system 23A can be set to 0, and the load command value (v) to the power generation system 25 can be set to 0. Therefore, it is possible to prevent the operation and stop of the hydrogen production system 23A and the power generation system 25 from being frequently switched. Note that the distribution process to the battery system 24 may be performed only for the hydrogen production system 23A. The distribution process to the battery system 24 may be performed only when the absolute value of the load command value (v) is small and the load command value (v) is positive. The distribution process to the battery system 24 may be performed only for the power generation system 25. That is, the distribution process to the battery system 24 may be performed only when the absolute value of the load command value (v) is small and the load command value (v) is negative.

[0116] According to these configurations, control can be performed in accordance with the operating conditions of the power generation system 25 and / or the hydrogen production system 23A.

[0117] In short, when the magnitude of the power generation / load power command value is small, the EMS1 may distribute the power generation / load power command value to the charge / discharge power of the energy storage device instead of the power generation / load adjustment device.

[0118] [Modification Example 5] In the simulations of Examples 1 and 2, the time constant of the first-order lag used for the smoothing filter 111a was fixed. The time constant of the first-order lag used for the smoothing filter 111a may be variable. For example, when the generated power of the solar power generation system 21 fluctuates greatly and rapidly, there is a possibility that the charge / discharge power command value (u_BAT) of the battery system 24 may temporarily exceed the rated value of the charge / discharge power. In such a case, there is a risk that a large deviation may occur between the received / sent power and the target value (r_SYS). Therefore, as the charge / discharge power command value (u_BAT) of the battery system 24 approaches the rated value of charge / discharge, the time constant of the smoothing filter 111a is decreased. As a result, the load change of the hydrogen production system 23A and / or the power generation system 25 is temporarily accelerated. Therefore, it becomes possible to reduce the deviation of the received / sent power from the target value (r_SYS).

[0119] [Modification Example 6] In the above-described embodiment, a PID controller was exemplified as the feedback control unit 113 used for the battery system 24. The controller used as the feedback control unit 113 may be other controllers such as a PI controller, a PD controller, an I-PD controller, or a two-degree-of-freedom PID controller. The controller used as the feedback control unit 113 may be a controller using control theory such as H 2 control theory or H ∞ control theory.

[0120] [Modification Example 7] In Examples 1 and 2, the target value (r_SOC) of the remaining amount of the battery system 24 was fixed at 50%. The target value (r_SOC) of the remaining amount of the battery system 24 may be variable. For example, it may be possible to perform an energy shift that charges during the day and discharges at night using the battery system 24. In this case, the target value (r_SOC) of the remaining amount of the battery system 24 may be a curve that gradually increases from sunrise to sunset and gradually decreases from sunset to sunrise.

[0121] The target value (r_SOC) of the remaining amount of the battery system 24 may be set each time using the weather forecast for the next day. For example, when it is predicted that the generated power of the solar power generation system 21 will greatly exceed the sum of the power demand and the rated value of the water electrolysis device, the target value (r_SOC) may be set so that the remaining amount of the battery gradually increases during the day. In other words, when it is predicted that there will be too much power, the target value (r_SOC) may be set so that the remaining amount of the battery gradually increases during the day. Further, the target value (r_SOC) of the remaining amount of the battery system 24 may be set to 50% on the condition of cloudy weather or the like. The target value (r_SOC) of the remaining amount of the battery system 24 may be manually set by the operator. The target value (r_SOC) of the remaining amount of the battery system 24 may be given from another higher-level system determined by an optimization method or the like to the EMS1.

[0122] [Modification Example 8] The number of hydrogen production systems 23A and the number of power generation systems 25 included in the power system that is the control target of the EMS1 are not particularly limited. In the above-described embodiment, the microgrid 2 included one hydrogen production system 23A and one power generation system 25. However, the number of hydrogen production systems 23A and power generation systems 25 included in the microgrid 2 is not limited to one each.

[0123] For example, when there are a plurality of hydrogen production systems 23A, the EMS1 distributes the power consumption command value (u_EC) to the hydrogen production systems 23A of Examples 1 and 2 according to the rated ratio for each of the hydrogen production systems 23A. The EMS1 may distribute the power consumption command value (u_EC) to the hydrogen production systems 23A of Examples 1 and 2 according to the equipment operation time. The power consumption equipment may be an ammonia production system instead of the hydrogen production system 23A. In this case, the hydrogen storage system becomes an ammonia storage system. The power generation system 25 may be a fuel cell using ammonia as fuel. There may be a power consumption facility in the plant that produces both hydrogen and ammonia. The power generation system 25 may be a fuel cell that uses both hydrogen and ammonia as fuel.

[0124] [Modification Example 9] The renewable energy power generation device is not limited to one including only the solar power generation system 21. For example, the renewable energy power generation device may be a composite system including the solar power generation system 21 and a wind power generation system.

[0125] [Modification Example 10] In the above-described embodiment, the power has been described as AC power. The received / sent power used as the control amount may be DC. In the case of AC, there may be a capacitor or the like for controlling the power factor as power equipment.

[0126] [Modification Example 11] As the control of the remaining amount of the battery system 24, the proportional gain element 112a was used. Instead of the proportional gain element 112a, a non-linear gain element may be used. For example, the non-linear gain element has a small gain when the absolute value of the difference between the gain for SOC control (Kp_SOC) and the target value (r_SOC) of the remaining battery amount (SOC) is small. In this case, the gain may be 0. The non-linear gain element may be set to a large gain when the deviation is large. In other words, the non-linear gain element may be set to a large gain when approaching the upper and lower limits of the battery capacity. Further in other words, the non-linear gain element may be set to a large gain when approaching the upper and lower limits of the battery capacity. The control technology of the present disclosure does not aim at precise control of the remaining amount of the battery system 24. Therefore, control using such a non-linear gain element is suitable within a range where there is no problem with the remaining amount of the battery system 24.

[0127] [Modification Example 12] In Example 2, from 13:00 to one and a half hours, since the target value (r_SYS) was power transmission, the power consumption of the hydrogen production system 23A became zero (see Fig. 9(b)). However, some power-consuming equipment may not be able to set the minimum power consumption for operation to 0 kW. For example, as the minimum operating condition of the power-consuming equipment, it may be up to 10% of the rated power. Manual work is required for the operation to stop the power-consuming equipment. When starting the power-consuming equipment, it may take about several hours due to temperature rise or the like. That is, there may be some restrictions in the operation of the power-consuming equipment.

[0128] Therefore, when a short-term (one and a half hours) demand response as in Example 2 is assumed, it may be more convenient to continue operating at the minimum load rather than setting the power consumption of the power-consuming device to 0 kW.

[0129] FIG. 13 is a control block diagram of a command value generation unit 11C included in the EMS of Modification 12. The EMS1 includes a saturator 111c. The saturator 111c sets the minimum power consumption added before the command value (u_BAT) of the hydrogen production system 23A as the lower limit. When the command value (u_BAT) is between the minimum target command value and the maximum target command value, the saturator 111c outputs the input command value (u_BAT) as it is. When the command value (u_BAT) is less than or equal to the minimum target command value, the saturator 111c outputs the minimum target command value as the new command value (u_BAT) instead of the input command value (u_BAT). When the command value (u_BAT) is greater than or equal to the maximum target command value, the saturator 111c outputs the maximum target command value as the new command value (u_BAT) instead of the input command value (u_BAT). The EMS1 adds the difference before and after the saturator 111c to the command value (u_GR) of the power generation system 25. For example, the EMS1 adds the difference between the command value (u_BAT) input to the saturator 111c and the minimum target command value set as the new command value (u_BAT) to the command value (u_GR) of the power generation system 25. Thereby, the lower limit of the power consumption of the hydrogen production system 23A is suppressed to a certain value. The power consumption is compensated by the power generation system 25. It may also be a block that does not add the difference before and after the saturator 111c to the power generation system 25. A configuration that only adds the saturator 111c may be adopted. In that case, the minimum power consumption is compensated by the discharge of the battery system 24. When the minimum power consumption × duration is sufficiently small compared to the capacity of the battery, the latter method can be used to handle it.

[0130] The target presentation unit 12 included in the EMS1 further indicates the minimum target command value, which is the minimum value of the first command value, and / or the maximum target command value, which is the maximum value of the first command value. When the first command value is less than or equal to the minimum target command value, the command value generation unit 11C outputs the minimum target command value as the first command value. When the first command value is greater than or equal to the maximum target command value, the command value generation unit 11C outputs the maximum target command value as the first command value. According to this configuration, control can be performed according to the operating conditions of the power generation system 25 and the hydrogen production system 23A.

[0131] The command value generation unit 11C included in the EMS1 outputs a minimum target command value or a maximum target command value to the hydrogen production system 23A. The command value generation unit 11C outputs a complementary command value to the power generation system 25 to complement the power corresponding to the difference between the first command value and the minimum target command value or the power corresponding to the difference between the first command value and the maximum target command value. According to this configuration, control in accordance with the operating conditions of the power generation system 25 and the hydrogen production system 23A can be performed well.

[0132] The command value generation unit 11C included in the EMS1 outputs a minimum target command value or a maximum target command value to the hydrogen production system 23A. The command value generation unit 11C outputs a complementary command value to the battery system 24 to complement the power corresponding to the difference between the first command value and the minimum target command value or the power corresponding to the difference between the first command value and the maximum target command value. Also according to this configuration, control in accordance with the operating conditions of the power generation device and / or the demand device can be performed well.

[0133] [Appendix] Hydrogen is attracting attention as a next-generation energy source. The adjustment device for the power system and the adjustment program for the power system of the present disclosure can perform hydrogen production using surplus power of renewable energy. Therefore, the adjustment device for the power system and the adjustment program for the power system of the present disclosure contribute to the spread of CO 2 free hydrogen. The adjustment device for the power system and the adjustment program for the power system of the present disclosure show a technology for suppressing the adverse effects on the power grid, which is an issue of renewable energy sources, and also contribute to the spread and expansion of renewable energy sources themselves. That is, the adjustment device for the power system and the adjustment program for the power system of the present disclosure contribute to Target 7.2 and Target 9.3 listed in the Sustainable Development Goals (SDGs) led by the United Nations.

[0134] Target 7.2 is "to significantly expand the share of renewable energy in the global energy mix by 2030."

[0135] Target 9.3 is "By 2030, improve sustainability through improved infrastructure and industrial improvement by enhancing resource utilization efficiency and introducing and expanding clean technologies and environmentally considerate technologies and industrial processes. All countries will take actions according to their respective capabilities."

[0136] [Appendix] This disclosure includes the following configurations.

[0137] The adjustment device for a power system of the present disclosure is [1] "a renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device with adjustable consumed power, an energy storage device having a second responsiveness equal to or higher than the first responsiveness and storing the received power and outputting the stored power, and a power consumer including facilities that consume the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the energy storage device. An adjustment device for a power system, comprising a target presentation unit that indicates a target power, a power acquisition unit that obtains a combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device, and / or the power consumed by the demand device, the power output or consumed by the energy storage device, and the power consumed by the power consumer, and a command value generation unit that generates a first command value and a second command value such that the combined power approaches the target power. The combined power includes a long- and medium-term cycle component including a first fluctuation component and a short-term cycle component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. The command value generation unit outputs the first command value corresponding to the long- and medium-term cycle component to the power generation device and / or the demand device, and outputs the second command value corresponding to the short-term cycle component to the energy storage device."

[0138] The adjustment device for the power system of the present disclosure is "[2] The power acquisition unit further acquires the power output by the renewable energy power generation device and the power consumed by the power consumer, and the command value generation unit uses the power output by the renewable energy power generation device, the power consumed by the power consumer, and the target power to generate the first command value corresponding to the long and medium period components, and uses the combined power and the target power to generate the second command value corresponding to the short period component. The adjustment device for the power system according to [1] above."

[0139] The adjustment device for the power system of the present disclosure is "[3] The power acquisition unit further acquires the power stored in the energy storage device, the target presentation unit further shows the target energy storage value which is the target value of the power stored in the energy storage device, and the command value generation unit generates the second command value such that the remaining amount of the power stored in the energy storage device approaches the target energy storage value. The adjustment device for the power system according to [1] or [2] above."

[0140] The adjustment device for the power system of the present disclosure is "[4] The target presentation unit further shows the minimum target command value which is the minimum value of the first command value and / or the maximum target command value which is the maximum value of the first command value, and when the first command value is less than or equal to the minimum target command value, the command value generation unit outputs the minimum target command value as the first command value, and when the first command value is greater than or equal to the maximum target command value, the command value generation unit outputs the maximum target command value as the first command value. The adjustment device for the power system according to any one of [1] to [3] above."

[0141] The adjustment device for the power system of the present disclosure is "[5] The command value generation unit outputs the minimum target command value or the maximum target command value to the demand device, and outputs a complementary command value to the power generation device to complement the power corresponding to the difference between the first command value and the minimum target command value or the power corresponding to the difference between the first command value and the maximum target command value. The adjustment device for the power system according to [4] above."

[0142] The adjustment device for the power system of the present disclosure is as described in [6] "The command value generation unit outputs the minimum target command value or the maximum target command value to the demand device, and outputs a complementary command value to the energy storage device to complement the power corresponding to the difference between the first command value and the minimum target command value or the power corresponding to the difference between the first command value and the maximum target command value. The adjustment device for the power system described in the above [4]."

[0143] The adjustment program for the power system of the present disclosure is as described in [7] "A renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and whose output power is adjustable and / or a demand device whose consumed power is adjustable, and a second responsiveness that is equal to or higher than the first responsiveness, and an energy storage device that accumulates the received power and outputs the accumulated power, and an electric power consumer including a facility that consumes the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the energy storage device. An adjustment program for a power system that causes a computer to perform adjustment of the power system, which includes indicating a target power, obtaining a combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device, and / or the power consumed by the demand device and the power output or consumed by the energy storage device, and the power consumed by the power consumer, and generating a first command value and a second command value such that the combined power approaches the target power. The combined power includes a long and medium cycle component including a first fluctuation component and a short cycle component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. In generating the first command value and the second command value, causing the computer to output the first command value corresponding to the long and medium cycle component to the power generation device and / or the demand device, and output the second command value corresponding to the short cycle component to the energy storage device. An adjustment program for a power system."

[0144] The adjustment device for a power system according to the present disclosure is an adjustment device for a power system including a renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device having adjustable consumed power, an energy storage device having a second responsiveness equal to or higher than the first responsiveness and storing the received power and outputting the stored power, and a power consumer including facilities that consume the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the energy storage device. The adjustment device includes a target presentation unit that indicates a target power, a power acquisition unit that obtains the power output by the renewable energy power generation device and the power consumed by the power consumer, and a command value generation unit that generates a first command value and a second command value such that the combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device and / or the power consumed by the demand device, the power output or consumed by the energy storage device, and the power consumed by the power consumer approaches the target power. The combined power includes a long- and medium-period component including a first fluctuation component and a short-period component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. The command value generation unit generates the first command value corresponding to the long- and medium-period component using the power output by the renewable energy power generation device, the power consumed by the power consumer, and the target power, and generates the second command value corresponding to the short-period component using the combined power and the target power.

Explanation of Signs

[0145] 1 EMS (Adjustment Device for Power System) 2 Microgrid 3 Power Grid 4 Resource Aggregator 11, 11C Command Value Generation Unit 12 Target Presentation Unit 13 Power Acquisition Unit 21 Photovoltaic Power Generation System 22 Power Consumer 23A Hydrogen production system 23B Hydrogen storage system 24 Battery system 25 Power generation system 26 Power measurement unit 26A Transmission power measurement unit 26B Reception power measurement unit 26C Renewable energy power measurement unit 26D Customer consumption power measurement unit 27 Connection unit 101 CPU 102 Main memory unit 103 Auxiliary memory unit 104 Communication control unit 105 Input device 106 Output device 110 Program 111 Feedforward control unit 111a Smoothing filter 111b Distribution element 111c Saturator 112 Command value correction unit 112a Proportional gain element 112b Correction element 113 Feedback control unit 121 Operation unit 122 External communication unit 211 Solar panel 212 Power conditioner

Claims

1. A renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device having adjustable power consumption, a power storage energy device having a second responsiveness equal to or higher than the first responsiveness, storing the received power and outputting the stored power, and a power consumer including a facility that consumes the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the power storage energy device. A control device for a power system, comprising: A target presentation unit that indicates a target power; A power acquisition unit that obtains a combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device and / or the power consumed by the demand device, the power output or consumed by the power storage energy device, and the power consumed by the power consumer, the power output by the renewable energy power generation device, and the power consumed by the power consumer; A command value generation unit that generates a first command value and a second command value such that the combined power approaches the target power. The combined power includes a long- and medium-term cycle component including a first fluctuation component and a short-term cycle component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. The command value generation unit: Generates the first command value corresponding to the long- and medium-term cycle component using the power output by the renewable energy power generation device, the power consumed by the power consumer, and the target power, and outputs the first command value corresponding to the long- and medium-term cycle component to the power generation device and / or the demand device. A control device for a power system that generates the second command value corresponding to the short-term cycle component using the combined power and the target power, and outputs the second command value corresponding to the short-term cycle component to the power storage energy device.

2. The power acquisition unit further obtains the power stored in the power storage energy device. The target presentation unit further indicates a target stored energy value that is the target value of the power stored in the power storage energy device. The command value generation unit generates the second command value such that the remaining amount of the power stored in the power storage energy device approaches the target stored energy value. The control device for a power system according to Claim 1.

3. The target indication unit further indicates a minimum target command value that is the minimum value of the first command value and / or a maximum target command value that is the maximum value of the first command value. The command value generation unit outputs the minimum target command value as the first command value when the first command value is less than or equal to the minimum target command value, and outputs the maximum target command value as the first command value when the first command value is greater than or equal to the maximum target command value. The power system adjustment device according to claim 1.

4. The command value generation unit outputs the minimum target command value or the maximum target command value to the demand device, and outputs a complementary command value to the power generation device to complement the power corresponding to the difference between the first command value and the minimum target command value or the power corresponding to the difference between the first command value and the maximum target command value. The power system adjustment device according to claim 3.

5. The command value generation unit outputs the minimum target command value or the maximum target command value to the demand device, and outputs a complementary command value to the energy storage device to complement the power corresponding to the difference between the first command value and the minimum target command value or the power corresponding to the difference between the first command value and the maximum target command value. The power system adjustment device according to claim 3.

6. A renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device having adjustable consumed power, and a second responsiveness equal to or higher than the first responsiveness. An energy storage device that accumulates the received power and outputs the accumulated power, and a power consumer that includes a facility that consumes the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the energy storage device. A power system adjustment program that causes a computer to execute the adjustment of the power system, indicating the target power, obtaining the combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device and / or the power consumed by the demand device and the power output or consumed by the energy storage device, the power output by the renewable energy power generation device, and the power consumed by the power consumer, and generating a first command value and a second command value such that the combined power approaches the target power. The combined power includes a long- and medium-period component including a first fluctuation component and a short-period component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. In generating the first command value and the second command value, the first command value corresponding to the long- and medium-period component is generated using the power output by the renewable energy power generation device, the power consumed by the power consumer, and the target power, and the first command value corresponding to the long- and medium-period component is output to the power generation device and / or the demand device. A power system adjustment program that causes the computer to generate the second command value corresponding to the short-period component using the combined power and the target power, and output the second command value corresponding to the short-period component to the energy storage device.

7. An adjustment device for a power system, including a renewable energy power generation device that generates power using renewable energy, a power generation device having a first responsiveness and adjustable output power and / or a demand device having adjustable consumed power, an energy storage device having a second responsiveness equal to or higher than the first responsiveness and storing received power and outputting the stored power, and a power consumer including a facility that consumes the power output by the renewable energy power generation device, the power output by the power generation device, and the power output by the energy storage device. A target presentation unit that indicates a target power; A power acquisition unit that obtains the power output by the renewable energy power generation device and the power consumed by the power consumer; A command value generation unit that generates a first command value and a second command value such that the combined power obtained by adding the power output by the renewable energy power generation device, the power output by the power generation device and / or the power consumed by the demand device, the power output or consumed by the energy storage device, and the power consumed by the power consumer approaches the target power. The combined power includes a long- and medium-period component including a first fluctuation component and a short-period component including a second fluctuation component belonging to a frequency band higher than the first fluctuation component. The command value generation unit generates the first command value corresponding to the long- and medium-period component using the power output by the renewable energy power generation device, the power consumed by the power consumer, and the target power. An adjustment device for a power system that generates the second command value corresponding to the short-period component using the combined power and the target power.

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