Solar network power plant system and operation method therefor

Abstract

To provide a solar network power plant system and its operation method capable of accurately and appropriately discharging and outputting power stored in a solar network power plant configured by virtual integration to a power transmission network at an arbitrary time with an arbitrary power amount.SOLUTION: A solar network power plant system is configured to be managed by an external management computer 70 with a solar storage battery unit 10 being provided as a terminal unit. An information network is provided such that an operation device of an external management computer 70 can access identification information given to a communication control device 35, unique information for each solar storage battery unit 10, power storage information for each solar storage battery unit 10, and power demand information. The external management computer 70 plans and controls discharge output for each solar storage battery unit 10 based on the identification information, the unique information, the power storage information, and the power demand information.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solar network power plant system and an operation method thereof, in which a solar storage battery unit is provided in each of a plurality of solar power plants as a terminal unit where solar power generation and storage are performed and which is connected to a power transmission grid via a power conditioner, the solar storage battery unit including a power generation unit that generates power from sunlight, a storage battery that can automatically charge the power generated by the power generation unit, and a communication control device equipped so that the discharge output from the storage battery can be controlled by instructions from outside, and a plurality of the solar storage battery units are connected to an external management computer via a communication network by each of the communication control devices, thereby being virtually integrated as a solar network power plant and managed by the external management computer. [Background technology]

[0002] As shown in FIG. 5, a conventional solar power plant 100 includes a power generation unit 20 having a plurality of solar power generation panels 21 connected in series, and a power conditioner 40 in which a plurality of the power generation units 20 are connected in parallel, and is connected to an electric power company 50. That is, the basic configuration of the photovoltaic power plant 100 is that first, a plurality of photovoltaic power generation panels 21 are connected in series to form one power generation unit 20 circuit so that the voltage matches the voltage received by the power conditioner 40. Furthermore, a plurality of the power generation unit 20 circuits are connected in parallel to the power conditioner 40 to form one power conditioner 40 system. The power generation output of the photovoltaic power plant 100 is the sum of the outputs of the power conditioners 40 connected in parallel.

[0003] A specific example of a conventional solar power plant will be described. A typical solar power generation panel 21 generates DC power with a normal output of 300 W, a maximum output voltage of 40 V, a normal generation voltage of 30 V, and a normal generation current of 10 A. Seven solar power generation panels 21 are connected in series to form a power generation unit 20, which is connected to a power conditioner 40 with a maximum output voltage of 280 V, a normal generation voltage of 210 V, a normal generation current of 10 A, and a system generation power of 2100 W (2.1 kW). This basic system configuration is almost standardized regardless of whether the solar power plant is small or large. The number of systems is adjusted according to the output of the power generation unit 20 and connected to the power conditioner 40. For example, in the case of a 5 kW power conditioner 40, three 2.1 kW solar power generation panel systems (power generation units 20) are connected in parallel. For a 50 kW power conditioner, 30 systems are connected, and for a 1000 kW mega solar power plant, 600 systems are connected. The power conditioner 40 has a characteristic of automatically outputting AC power in proportion to the DC input power from the photovoltaic power generation panel system.

[0004] Also, as a photovoltaic power storage device mainly for home use, a photovoltaic power generation storage and discharge device has been disclosed, which has a DC input terminal from a solar panel, a DC output terminal to a power conditioner (a device that converts DC power into commercial AC power), and a connection terminal for a signal line from a power sensor, and in which a control panel having a built-in circuit for storing power in the storage battery and controlling the DC output to the power conditioner based on a signal from the power sensor is fixed to the exterior of the storage battery, and the storage battery connection terminal of the control panel is wired and integrated with the storage battery (see Patent Document 1). According to this, it is possible to provide a photovoltaic power generation storage and discharge device that can store surplus power from photovoltaic power generation and consume the stored power at home, thereby significantly reducing the household's electricity purchase costs.

[0005] Also, a network system of solar battery charging units has been disclosed that includes a solar battery module installed in a building, multiple solar battery charging units each equipped with a storage battery that stores the power generated by the solar battery module and a charger that supplies charging power to an electric vehicle, and a management device configured to be able to communicate with the multiple solar battery charging units via the Internet (see Patent Document 2). This makes it possible to popularize charging stations that use solar power generation and provide a network system of solar battery charging units that allows electric vehicles and the like to be charged on the go. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3223017 (Page 1) [Patent Document 2] Patent Publication No. 2021-97558 (Page 1) Summary of the Invention [Problem to be solved by the invention]

[0007] Under the new national FIT system (Feed-in Tariff Scheme for Renewable Energy) established in 2012, all electricity generated by solar power is sold to power companies at the same time as it is generated, but as this system becomes more widespread, the amount of electricity generated has increased, resulting in excess electricity generated during the day, and a social problem of electricity shortages in the evening and at night has arisen. In response to this, solar power plants are currently required to be able to stop generating electricity during the day to prevent excess electricity, and power generation is stopped by installing a power generation stop device. As a result, power generation companies incur economic losses due to the loss of generated energy during the power stop, and society as a whole faces the problem of electricity shortages outside of the daytime hours when excess electricity is generated.

[0008] Therefore, an object of the present invention is to provide a solar network power plant system and an operation method thereof that can more accurately and appropriately discharge electricity stored in a virtually integrated solar network power plant to a power grid at any time and in any amount without stopping solar power generation. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention has the following configuration. According to one embodiment of the solar network power plant system of the present invention, in each of a plurality of solar power plants, a solar storage battery unit is provided as a terminal unit where solar power generation and storage are performed and connected to a power grid via a power conditioner, the solar storage battery unit including a power generation unit that generates power from sunlight, a storage battery that can automatically charge the power generated by the power generation unit, and a communication control device equipped so that the discharge output from the storage battery can be controlled by an external instruction, and a plurality of the solar storage battery units are connected to an external management computer via a communication network by each of the communication control devices, thereby being virtually integrated as a solar network power plant and managed by the external management computer. In this solar network power plant system, An information network is provided to enable identification information attached to the communication control device, unique information linked to the identification information, which includes at least information on the installation location of each of the solar storage battery units, storage information which is variable information linked to the identification information, which includes at least information on the stored power amount of each of the solar storage battery units, and power demand information which is external information on power demand and is variable information, to access a calculation device of the external management computer, and the external management computer creates a discharge output plan for each of the solar storage battery units based on the identification information, the unique information, the storage information, and the power demand information, and controls the discharge output for each of the solar storage battery units so that the power stored in the solar network power plant can be discharged to a power transmission grid at any time and with any amount of power.

[0010] In addition, according to one embodiment of the solar network power plant system of the present invention, the storage information can be characterized in that it includes information on the amount of stored power estimated by measuring the voltage of the storage battery.

[0011] In addition, according to one embodiment of the solar network power plant system of the present invention, the information network is provided so that information on the discharge output of each solar storage battery unit, which information can be obtained by measuring the output voltage and output current of the storage battery over time, can be accessed by the external management computer.

[0012] Furthermore, according to one embodiment of a method for operating a solar network power plant system according to the present invention, the method for operating the solar network power plant system under control of the external management computer can include the steps of: determining, by the external management computer, an amount of stored power based on power storage information from each of the solar storage battery units; determining, by the external management computer, an amount of power demand predicted based on the power demand information; creating, by the external management computer, a plan for discharge output for each of the solar storage battery units based on the identification information, the unique information, the power storage information, and the power demand information as a power supply plan for supplying power from the solar network power plant to the power transmission network; and performing discharge output for each of the solar storage battery units in response to an instruction from the external management computer based on the plan for discharge output.

[0013] Furthermore, according to one embodiment of the method for operating a solar network power plant system of the present invention, the method can include a step of determining an operating condition of each of the solar storage battery units by comparing information on an estimated output power amount estimated from plan information on the discharge output planned for each of the solar storage battery units with information on the output power amount discharged to a power transmission grid by controlling the discharge output for each of the solar storage battery units, which information can be obtained by measuring the output voltage and output current of the battery over time, and correcting the plan and control related to the discharge output of each of the solar storage battery units by the external management computer.

[0014] Furthermore, according to one embodiment of the method for operating a solar network power plant system according to the present invention, the method can include a step of determining an operating status of the solar power plant by comparing, by the external management computer, information on the amount of power supply output from the solar power plant to the power grid, which is determined by measuring with a calibration power meter provided for each of the solar power plants, with information on an estimated amount of power supply of the solar power plant, which is estimated by integrating information on the amount of output power from each of the solar storage battery units, and correcting plans and controls related to the discharge output of each of the solar storage battery units by the external management computer. Effect of the Invention

[0015] The solar network power plant system and its operating method of the present invention have the particularly advantageous effect of being able to discharge electricity stored in a virtually integrated solar network power plant more accurately and appropriately to the power grid at any time and in any amount of electricity, without stopping solar power generation. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a configuration diagram illustrating an example of a solar network power plant system according to the present invention. [Diagram 2] FIG. 11 is an explanatory diagram for explaining access to information relating to an operation example of the solar network power plant system of the present invention. [Diagram 3] FIG. 2 is a single-line diagram showing an example of the configuration of each of the photovoltaic power plants shown in FIG. 1. [Figure 4] 2 is a single-line diagram showing an example of the configuration of each storage battery unit in the example of FIG. 1. [Diagram 5] FIG. 1 is a single-line diagram showing an example of a configuration of a conventional solar power plant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, examples of a solar network power plant system and an operation method thereof according to the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 to 4).

[0018] In the solar network power plant system according to the present invention, as shown in Figures 1 to 4, in each of a plurality of solar power plants 100, a solar storage battery unit 10 is provided as a terminal unit where solar power generation and storage are performed and which is connected to a power transmission grid 55 via a power conditioner 40. The solar storage battery unit 10 includes a power generation unit 20 that generates power from solar light, a storage battery 31 (see Figure 4) that can automatically charge the power generated by the power generation unit 20, and a communication control device 35 (see Figure 4) that is equipped so that the discharge output from the storage battery 31 can be controlled by external instructions.

[0019] In addition, multiple solar storage battery units 10 are connected to an external management computer 70 via a communication network (e.g., the Internet 60) by their respective communication control devices 35, thereby virtually integrating them into a solar network power plant, forming a solar network power plant system that is managed by the external management computer 70.

[0020] Furthermore, in the solar network power plant system of the present invention, an information network is provided so that identification information attached to the communication control device 35 to identify each solar storage battery unit 10, unique information related to each solar storage battery unit 10 and including at least information related to the installation location and linked to the identification information, power storage information which is variable information related to each solar storage battery unit 10 and including at least information related to the stored power amount and linked to the identification information, and power demand information which is variable information and is external information related to power demand, can access the arithmetic device of the external management computer 70.

[0021] In the present invention, the solar network power plant system is such that the external management computer 70 creates a discharge output plan for each solar storage battery unit 10 based on the identification information, the unique information, the storage information, and the power demand information, and controls the discharge output for each solar storage battery unit 10, so that the electricity stored in the solar network power plant can be discharged and output to the power transmission grid 55 at any time and in any amount of electricity.

[0022] This provides the special advantageous effects of enabling the virtually integrated photovoltaic network power plant to be managed rationally, enabling the photovoltaic power plant 100 to be used without being shut down and the power stored in the photovoltaic network power plant to be discharged to the power grid more accurately and appropriately at any time and with any amount of power. In addition, since each photovoltaic storage battery unit 10 is managed individually, it becomes possible to grasp the degradation of power generation performance and storage battery performance and equipment failure in the smallest unit, and problems can be grasped and dealt with without shutting down the entire photovoltaic power plant 100.

[0023] The identification information according to the present invention is an identification means such as an identification code that is assigned so as to enable management by the external management computer 70, and the identification code may, for example, be an identification number consisting of numbers only, or it may of course be one that uses letters, symbols, etc.

[0024] In addition, the unique information according to the present invention is fixed information, and can include, in addition to information on the installation location such as position information, individual information on the solar power generation panel 21 (an example of a form of power generation device constituting the power generation unit 20) and the storage battery 31 that deteriorate over time.

[0025] In addition, the power storage information according to the present invention can include information for grasping the fluctuating power storage situation for each solar storage battery unit 10, such as information on the amount of stored power estimated by measuring the voltage of the storage battery 31, and information on the amount of stored power predicted for each region (each solar power plant 100) depending on weather conditions.

[0026] Furthermore, the electricity demand information of the present invention can include fluctuation information such as the market price of electricity other than the FIT system determined by JEPX (Japan Electric Power Exchange, a general incorporated association) and demand forecasts that vary from region to region depending on weather conditions.

[0027] This information can be used, for example, to determine the priority order of the solar storage battery units 10 that are discharged, or to select or exclude the solar storage battery units 10 that are discharged at a specific time or in a specific area. For example, the operation of the solar network power plant system can be optimized by controlling the solar storage battery units 10 to be discharged preferentially from those close to areas with high power demand, or by controlling the solar storage battery units 10 to be discharged preferentially from those with high stored power.

[0028] In this embodiment, the information network can be provided so that information on the amount of output power, which can be obtained by measuring the output voltage and output current of the storage battery 31 over time as information on the discharge output of each solar battery unit 10, can be accessed by the external management computer 70. This allows the operating status of the solar network power plant system to be properly understood as described below, and the operation can be properly corrected and optimized.

[0029] Next, an embodiment of an operation method for the above-mentioned solar network power plant system will be described with reference to Fig. 2. In this embodiment of the operation method, the solar network power plant system is operated under the control of an external management computer 70, and includes a step of grasping the amount of stored power (step 1), a step of grasping the amount of power demand (step 2), a step of creating a discharge output plan (step 3), a step of performing a discharge output (step 4), and a step of comparing and collating the discharge output. The step of comparing and collating the discharge output may include a step of collating plan information on the amount of output power for each solar storage battery unit 10 with information on the amount of output power for each solar storage battery unit 10 (step 5), and a step of collating information on the estimated amount of power supply of the solar power plant 100, which is integrated from information on the amount of output power for each solar storage battery unit 10, with information on the amount of power supply measured by a calibration wattmeter 45 provided for each solar power plant 10 (step 6).

[0030] In the step of grasping the amount of stored power (step 1), the external management computer 70 grasps the amount of stored power from the power storage information from each solar battery unit 10. This makes it possible to grasp the total amount of stored power in the solar network power plant, as well as the amount of stored power in each solar battery unit 10, which is the terminal unit where solar power generation and storage are performed, and therefore makes it possible to manage the most efficient supply of power to the power grid 55.

[0031] In the step of grasping the power demand (step 2), the power demand predicted by power demand information from, for example, JEPX (Japan Electric Power Exchange), is grasped by the external management computer 70. According to this, for example, when the power demand is larger than the amount of stored power, it is possible to discharge output from all the solar storage battery units 10 so that the entire amount of stored power in the entire solar network power plant is supplied to the power grid 55. Also, when the power demand is smaller than the amount of stored power, it is possible to manage so that a priority for discharge output is determined for each solar storage battery unit 10, for example, as described above.

[0032] In the step of creating a discharge output plan (step 3), the external management computer 70 creates a discharge output plan for each solar storage battery unit 10 based on the identification information, the unique information, the power storage information, and the power demand information as a power supply plan for supplying power from the solar network power plant to the power grid 55. This makes it possible to create a more accurate and appropriate discharge output plan.

[0033] Then, in a step of discharging (step 4), based on the plan for discharging, each solar storage battery unit 10 is discharged in response to an instruction from the external management computer 70. This allows the power stored in the solar network power plant to be discharged to the power grid more accurately and appropriately at any time and in any amount.

[0034] 2, in this embodiment, information on the estimated output power amount estimated from the plan information of the discharge output planned for each solar storage battery unit 10 and information on the output power amount discharged to the power transmission grid 55 by controlling the discharge output for each solar storage battery unit 10, which can be obtained by measuring the output voltage and output current of the storage battery 31 over time, are collated by the external management computer 70 to grasp the operating status of each solar storage battery unit 10, and the plan and control related to the discharge output for each solar storage battery unit 100 are corrected by the external management computer 70 (step 5). According to this, it is possible to feed back control for discharging the power stored in the solar network power plant to the power transmission grid 55 at any time with any amount of power (step 7), and it is possible to more accurately and appropriately manage each solar power plant 100 and each solar storage battery unit 10.

[0035] 2, this embodiment can include a step (step 6) in which the external management computer 70 compares information on the amount of power supply output from the photovoltaic power plant 100 to the power grid 55, which is obtained by measuring the amount of power supply measured by the calibration wattmeter 45 provided for each photovoltaic power plant 100 and transmitting the information to the external management computer 70, with information on the estimated amount of power supply from the photovoltaic power plant, which is estimated by integrating information on the amount of output power from each photovoltaic storage battery unit 10, to understand the operating status of the photovoltaic power plant 100, and corrects plans and controls related to the discharge output of each photovoltaic storage battery unit by the external management computer. This also makes it possible to feed back control for discharging the power stored in the photovoltaic network power plant to the power grid 55 (step 7), and management of each photovoltaic power plant 100 and each photovoltaic storage battery unit 10 can be performed more accurately and appropriately.

[0036] 2, this embodiment can include a step (step 8) of storing the power generation data for which the power generation data has been collated in step 5 or step 6. This power generation data is used as information for AI learning, and the information obtained by the AI ​​learning can be used to more appropriately control the operation of each solar battery unit 10, each solar power plant 100, or the solar network power plant as a whole.

[0037] In the solar power plant 100 of the embodiment shown in Fig. 3, a storage battery unit 30 (see Fig. 4) including a storage battery 31 and a communication control device 35 is connected between the power generation unit 20 and the power conditioner 40 for each power generation unit 20, thereby providing a solar storage battery unit 10 by the power generation unit 20 and the storage battery unit 30. This storage battery unit 30 can be charged with power generated by the power generation unit 20 and can be managed by an external management computer 70 so that the stored power can be discharged to the power conditioner 40 as desired (see Fig. 2).

[0038] A specific configuration example of the solar power plant 100 will now be described with reference to Fig. 3. Seven 300W solar power generation panels 21 are used to configure a power generation circuit (power generation units 20) with 2.1 kW, DC voltage of 280V, and DC current of 7.5A. Three circuits of the power generation units 20 are connected in parallel to a power conditioner 40 to configure a 5kW power conditioning system. A storage battery unit 30 is connected to each of the power generation units 20 of the three circuits. In order to charge most of the power generated during the day, each storage battery unit 30 should be provided with a 10kWh storage battery 31 (see Fig. 4).

[0039] 4 includes a charging circuit 32, a storage battery 31 in which the entire amount of power generated by the power generation unit 20 is automatically charged by the charging circuit 32, a discharging circuit 33 that discharges the power stored in the storage battery 31 to the power conditioner 40, and a communication control device 35 for remotely operating the discharging circuit 33. The storage battery 31 is connected to a voltmeter (not shown) that measures the voltage to grasp the amount of stored power, and an ammeter (not shown) that measures the output current to calculate the amount of power together with the output voltage measured by the voltmeter, and may be connected to the communication control device 35 so that information on the voltage and output voltage related to the amount of stored power and information on the output current can be communicated to the external management computer 70.

[0040] According to this, for example, all of the power generated by sunlight can be stored in the storage battery 31, and although it varies depending on the season, for example, around 3:00 pm, the approximate amount of stored power for that day can be grasped for each solar storage battery unit 10. Based on this, for example, by individually controlling a selected plurality (large number) of solar storage battery units 10 in accordance with the amount of power demand that is expected to increase from around 5:00 pm, in contrast to the decrease in the amount of power generated by sunlight, the solar network power plant system can freely discharge the amount of power required during the required time period. This eliminates the need to stop power generation at the solar power plant to prevent excess power during the day, and allows solar energy to be used effectively.

[0041] In addition, many photovoltaic storage battery units 10, each of which is made up of a power generation unit 20 and a storage battery unit 30, will be installed, but these photovoltaic storage battery units 10 can be mass-produced at low cost, reducing the equipment costs (initial costs) of the photovoltaic network power plant system. Furthermore, since the storage battery units 30 are installed for each power generation unit 20, they can be installed in a distributed manner within the photovoltaic power plant 100, with the advantage that no additional space is required.

[0042] Furthermore, although there are many manufacturers of power generation units 20 (e.g., photovoltaic power generation panels 21) and power conditioners 40, the basic specifications of the power generation circuits are the same. Therefore, even when a storage battery unit 30 is to be connected later to an already installed power generation unit 20, the storage battery unit 30 can be standardized and can be easily installed in an existing photovoltaic power plant 100. This makes it possible to mass-produce the storage battery unit 30, thereby reducing costs.

[0043] The information network in this embodiment uses, for example, the Internet 60 as a communication network, and a wireless LAN (Local Area Network) can be used in each solar power plant 100. This wireless LAN can be easily installed at low cost by using the widely used Wi-Fi.

[0044] The present invention relates to a power plant system for solar power generation. However, in addition to the configuration described above, it is of course possible to add a power generation system that uses other natural energies such as wind power and hydraulic power.

[0045] Although the present invention has been described above in various preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. [Explanation of symbols]

[0046] 10. Solar battery unit 20 Power Generation Units 21 Solar panels 30 Battery Unit 31 Storage battery 32 Charging circuit 33 Discharge circuit 35 Communication control device 40 Power conditioner 45 Calibration power meter 50 Electric Power Company 55 Power grid 60 Internet 70 External Management Computer 100 Solar power plants

Claims

1. In each of the multiple solar power plants, a solar storage battery unit is provided as a terminal unit where solar power generation and storage are performed and which is connected to a power grid via a power conditioner, the solar storage battery unit including a power generation unit which generates power from sunlight, a storage battery which can automatically charge the power generated by the power generation unit, and a communication control device which is equipped so that the discharge output from the storage battery can be controlled by an external instruction; A solar network power plant system configured such that a plurality of the solar storage battery units are connected to an external management computer via a communication network by the respective communication control devices, thereby being virtually integrated as a solar network power plant and being managed by the external management computer, Identification information assigned to the communication control device so as to identify each of the solar storage battery units; Unique information associated with the identification information, the unique information including at least information regarding an installation location of each of the solar battery units; Power storage information is variable information linked to the identification information, the power storage information including at least information regarding a stored power amount related to each of the solar battery storage units; an information network is provided so that external information relating to the demand for electricity, which is variable information, and power demand information can be accessed by the arithmetic unit of the external management computer; A solar network power plant system characterized in that the external management computer creates a discharge output plan for each solar storage battery unit based on the identification information, the unique information, the storage information, and the power demand information, and controls the discharge output for each solar storage battery unit, so that the electricity stored in the solar network power plant can be discharged and output to the power grid at any time and in any amount.

2. The solar network power plant system according to claim 1 , wherein the power storage information includes information on a stored power amount estimated by measuring a voltage of the storage battery.

3. The solar network power plant system according to claim 1, characterized in that the information network is provided so that information on the discharge output of each solar storage battery unit, which information can be obtained by measuring the output voltage and output current of the storage battery over time, can be accessed by the external management computer.

4. A method for operating the solar network power plant system according to any one of claims 1 to 3 under control of the external management computer, A step of grasping the amount of stored power by the external management computer based on the power storage information from each of the solar battery storage units; A step of grasping an amount of power demand predicted based on the power demand information by the external management computer; A step of creating a discharge output plan for each of the solar storage battery units in the external management computer based on the identification information, the unique information, the power storage information, and the power demand information as a power supply plan for supplying power from the solar network power plant to the power transmission grid; A method for operating a solar network power plant system, comprising: a step of discharging output for each solar storage battery unit based on the discharge output plan and in response to instructions from the external management computer.

5. The method for operating a solar network power plant system according to claim 4, further comprising a step of: determining an operating condition of each of the solar storage battery units by comparing, by the external management computer, information on an estimated output power amount estimated from plan information on a discharge output planned for each of the solar storage battery units; and information on an output power amount discharged to a power transmission grid by controlling the discharge output for each of the solar storage battery units, which information can be obtained by measuring an output voltage and an output current of the battery over time.; and correcting plans and controls relating to the discharge output of each of the solar storage battery units by the external management computer.

6. The method for operating a solar network power plant system according to claim 5, further comprising a step of: grasping an operating status of the solar power plant by comparing, by the external management computer, information on an amount of power supply output from the solar power plant to the power grid, which is grasped by measuring with a calibration power meter provided for each of the solar power plants, with information on an estimated amount of power supply of the solar power plant, which is estimated by integrating information on the amount of output power from each of the solar storage battery units; and correcting a plan or control related to a discharge output of each of the solar storage battery units by the external management computer.

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