Solar network power plant system and method for operating same

Abstract

The present invention provides a solar network power plant system and a method for operating the same capable of more accurately and appropriately discharging / outputting electric power stored in a solar network power plant configured to be virtually integrated, to a power transmission network at an arbitrary power amount at an arbitrary time. This solar network power plant system is provided with a solar storage battery unit 10 as a terminal unit unit and configured to be managed by an external management computer 70, wherein an information network is provided so that identification information attached 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 can be accessed by an arithmetic device of the external management computer 70, and the external management computer 70 plans and controls the discharge output for each solar storage battery unit 10 on the basis of the identification information, the unique information, the power storage information, and the power demand information.

Description

Solar network power plant system and its operation method

[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 at 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 external instructions, and in which 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.

[0002] As shown in Fig. 5 , a conventional solar power plant 100 includes a power generation unit 20 in which a plurality of solar power generation panels 21 are 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 solar power plant 100 is that first, a plurality of solar power generation panels 21 are connected in series to form one power generation unit 20 circuit so that the voltage matches the voltage accepted 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 solar 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 of these 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 2,100 W (2.1 kW). This basic system configuration is generally standardized for both small and large solar power plants. The number of systems connected to the power conditioner 40 is adjusted according to the output of the power generation unit 20. For example, a 5 kW power conditioner 40 has three 2.1 kW solar power generation panel systems (power generation units 20) connected in parallel. For a 50 kW system, 30 systems are connected, and a 1,000 kW mega solar power plant has 600 systems connected. The power conditioner 40 has a characteristic of automatically outputting AC power in proportion to the DC input power from the solar power generation panel system.

[0004] Furthermore, as a solar power storage device primarily for home use, a solar power generation storage / discharge device has been disclosed that includes 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 the control panel has a built-in circuit that stores power in the storage battery and controls the DC output to the power conditioner based on a signal from the power sensor, and the control panel is fixed to the exterior of the storage battery, and the storage battery connection terminal on the control panel is wired and integrated with the storage battery (see Patent Document 1).This makes it possible to provide a solar power generation storage / discharge device that can store surplus power from solar power generation and consume the stored power at home, thereby significantly reducing the household's electricity purchase costs.

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

[0006] Utility Model Registration No. 3223017 (Page 1) JP 2021-97558 (Page 1)

[0007] Under the national FIT system (feed-in tariff system for renewable energy), which was established in 2012, all solar-generated electricity is sold to electric power companies at the same time as it is generated. However, as this system has become more widespread, the amount of electricity generated has increased, resulting in excess electricity generated during the daytime, and a social problem of electricity shortages during times such as the evening and night has arisen. In response to this, solar power plants are currently required to be able to stop generating electricity during the daytime in order 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 power generation stoppages, and society as a whole is faced with the problem of electricity shortages outside of the time periods when excess electricity is generated during the daytime.

[0008] Therefore, an object of the present invention is to provide a solar network power plant system and an operation method thereof that can 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.

[0009] In order to achieve the above object, the present invention has the following configuration: In one embodiment of a solar network power plant system according to the present invention, in the solar network power plant system configured by a plurality of solar power plants connected by a power transmission network, in each of the plurality of solar power plants, a solar storage battery unit is configured by 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 that is equipped so that the discharge output from the storage battery can be controlled by an external instruction, as a terminal unit where solar power generation and storage are performed and which is connected to the power transmission network via a power conditioner, and the plurality of solar storage battery units are connected to an external management computer via a communication network by each of the communication control devices, separately from a network that is connected to an electric power company via a calibration wattmeter, thereby virtually unifying them as a solar network power plant, and the external management computer and an information network is provided to enable the external management computer to access identification information attached to the communication control device so as to identify each of the solar storage battery units, unique information linked to the identification information, which includes information on at least the installation location of each of the solar storage battery units, power storage information which is variable information linked to the identification information, which includes information on at least the amount of stored power, for each of the solar storage battery units, and power demand information which is variable information and is external information on power demand, 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 power 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 grid at any time and with any amount of power.

[0010] According to one aspect of the solar network power plant system of the present invention, the power storage information includes information on the amount of stored power estimated by measuring the voltage of the storage battery. According to one aspect of the solar network power plant system of the present invention, the solar storage battery unit includes the power generation unit, the storage battery that charges the power generated by the power generation unit via a charging circuit and discharges the power generated by the power generation unit via a discharging circuit, a power storage information acquisition means connected to the storage battery and acquires power storage information, and a communication control device that receives instructions from the external management computer and controls the discharge circuit so as to transmit the power storage information to the outside and control the discharge output from the storage battery, and the storage battery unit connected between the power generation unit and the power conditioner is configured by integrating the storage battery, the charging circuit, the discharging circuit, the power storage information acquisition means, and the communication control device into a single unit.

[0011] Furthermore, 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 is information on the amount of output power that 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, there is provided a method for operating the solar network power plant system under control by the external management computer, which can include the steps of: ascertaining, by the external management computer, an amount of stored power based on power storage information from each of the solar storage battery units; ascertaining, by the external management computer, an amount of power demand predicted based on the power demand information; creating, by the external management computer, a discharge output plan 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 grid; and performing discharge output for each of the solar storage battery units in accordance with an instruction from the external management computer based on the discharge output plan.

[0013] Furthermore, one embodiment of the method for operating a solar network power plant system according to the present invention can be characterized by including a step in which the external management computer compares information on an estimated amount of output power estimated from plan information on the discharge output planned for each of the solar storage battery units with information on the amount of output power discharged to a power transmission network by controlling the discharge output for each of the solar storage battery units, the information being obtainable by measuring the output voltage and output current of the battery over time. The information is then used to grasp the operating status of each of the solar storage battery units, and the plan and control related to the discharge output for each of the solar storage battery units are corrected by the external management computer.

[0014] Furthermore, one embodiment of the method for operating a solar network power plant system according to the present invention can be characterized by including a step of determining the operating status of the solar power plant by using the external management computer to compare 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 the 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.

[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 and output electricity stored in a virtually integrated solar network power plant to the power grid more accurately and appropriately at any time and in any amount of electricity without stopping solar power generation.

[0016] Fig. 1 is a configuration diagram illustrating an example embodiment of a solar network power plant system according to the present invention. Fig. 2 is an explanatory diagram illustrating access to information relating to an example operation of the solar network power plant system according to the present invention. Fig. 3 is a single-line diagram illustrating an example embodiment of each solar power plant in the example embodiment of Fig. 1. Fig. 4 is a single-line diagram illustrating an example embodiment of each storage battery unit in the example embodiment of Fig. 1. Fig. 5 is a single-line diagram illustrating an example embodiment of a conventional solar power plant.

[0017] Hereinafter, examples of a solar network power plant system and an operating 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, each of the multiple solar power plants 100 is provided with a solar storage battery unit 10 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 sunlight, 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] Furthermore, 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, separate from the network connected to the electric power company via a test wattmeter, thereby virtually integrating them as a solar network power plant and 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 according to the present invention, an information network is provided so that the identification information attached to the communication control device 35 to identify each solar storage battery unit 10, unique information linked to the identification information which includes information relating to at least the installation location of each solar storage battery unit 10, power storage information which is variable information linked to the identification information which includes information relating to at least the amount of stored power for each solar storage battery unit 10, and power demand information which is variable information and external information relating to power demand can be accessed by the arithmetic device of the external management computer 70, etc., for information processing.

[0021] In the present invention, the external management computer 70 creates a discharge output plan for each of the solar storage battery units 10 based on the identification information, the unique information, the power storage information, and the power demand information so that the power stored in the solar network power plant can be discharged and output to the power grid 55 at any time and in any amount, and controls the discharge output for each of the solar storage battery units 10. It goes without saying that the information processing according to the present invention can also be performed by using cloud computing or distributed information processing (information processing by multiple servers).

[0022] This has the special advantageous effect of enabling the virtually integrated solar network power plant to be managed rationally, enabling the solar power plant 100 to be used without being shut down and without waste, and enabling the power stored in the solar network power plant to be discharged more accurately and appropriately to the power grid at any time and in any amount. Furthermore, since each solar storage battery unit 10 is managed individually, it becomes possible to grasp any deterioration in power generation performance or storage battery performance or equipment malfunction in the smallest unit, and problems can be identified and addressed without shutting down the entire solar 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 that it can be managed by the external management computer 70, and the identification code may, for example, be an identification number consisting of only numbers, 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 in addition to information about the installation location such as location information, it can include individual information about the solar power generation panel 21 (such as the form of the power generation device that constitutes the power generation unit 20) and the storage battery 31, which deteriorate over time.

[0025] Furthermore, the power storage information according to the present invention can include information for grasping the fluctuating power storage situation for each solar battery unit 10, such as information on the amount of power storage estimated by measuring the voltage of the storage battery 31, and information on the amount of power storage 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 that under the FIT system determined by JEPX (Japan Electric Power Exchange, General Incorporated Association) and demand forecasts that vary by 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 to be discharged, or to select or exclude solar storage battery units 10 that are to be 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 that are closer to places with high power demand to be discharged first, or by controlling the solar storage battery units 10 that have a high amount of stored power to be discharged first.

[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 storage battery unit 10, can be accessed by the external management computer 70. This makes it possible to properly grasp the operating status of the solar network power plant system, as will be described later, and to properly correct and optimize its operation.

[0029] Next, an example of an operation method for the above-described solar network power plant system will be described with reference to FIG. 2 . In this example of the operation method, the solar network power plant system is operated under the control of an external management computer 70, and includes the steps of determining the amount of stored power (step 1), determining the amount of power demand (step 2), creating a discharge output plan (step 3), performing the discharge output (step 4), and comparing the discharge output. The step of comparing the discharge output may include the steps of comparing planned 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 comparing information on the estimated power supply amount of the solar power plant 100, which is calculated from the 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 power storage information from each solar storage battery unit 10. This makes it possible to grasp the overall amount of stored power in the solar network power plant, as well as the amount of stored power in each solar storage battery unit 10, which is an end unit where solar power generation and storage are performed, and therefore allows management to achieve the most efficient power supply to the power grid 55. For example, grasping (monitoring) the amount of stored power can be performed by the external management computer 70 from data (voltage and current data, etc.) intermittently transmitted (sent) from the communication control device 35 at set time intervals.

[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, a general incorporated association) is grasped by the external management computer 70. According to this, for example, when the power demand is greater than the amount of stored power, it is possible to discharge output from all the photovoltaic storage battery units 10 so that all the amount of stored power in the entire photovoltaic network power plant is supplied to the power grid 55. Furthermore, 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 photovoltaic storage battery unit 10, as described above, for example.

[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 transmission grid 55. This makes it possible to create a more accurate and appropriate discharge output plan.

[0033] Then, in the step of discharging output (step 4), based on the plan for discharge output, discharge output is performed for each solar storage battery unit 10 in accordance with 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 of power.

[0034] 2 , the present embodiment can include a step (step 5) in which the external management computer 70 compares information on the estimated output power amount estimated from plan information on the discharge output planned for each solar storage battery unit 10 with 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 information can be obtained by measuring the output voltage and output current of the storage battery 31 over time, to understand the operating status of each solar storage battery unit 10, and corrects the plan and control related to the discharge output for each solar storage battery unit 100 by the external management computer 70. This allows feedback (step 7) of control to discharge and output power stored in the solar network power plant to the power transmission grid 55 at any time with any amount of power, thereby enabling more accurate and appropriate management of each solar power plant 100 and each solar storage battery unit 10.

[0035] 2 , the present 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 a calibration wattmeter 45 provided in each photovoltaic power plant 100 and transmitting the information to the external management computer 70 via the network of the electric power company 50, with information on the estimated amount of power supply of the photovoltaic power plant, which is estimated by integrating information on the amount of power output 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 of discharging and outputting the power stored in the photovoltaic network power plant to the power grid 55 (step 7), thereby enabling more accurate and appropriate management of each photovoltaic power plant 100 and each photovoltaic storage battery unit 10.

[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 storage 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 each power generation unit 20 and the power conditioner 40, thereby providing a solar storage battery unit 10 consisting of 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). Furthermore, this storage battery unit 30 only needs to be simply connected between the power generation unit 20 and the power conditioner 40, and the power to operate this storage battery unit 30 (such as the communication control device 35) can also be provided by the power from the power generation unit 20.

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

[0039] 4 includes a charging circuit 32, a storage battery 31 that is automatically charged by the charging circuit 32 with all of the power generated by the power generation unit 20, a discharge 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 discharge circuit 33. The storage battery 31 is connected to a voltmeter (not shown) that measures the voltage to determine 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 can 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. 4, the solar storage battery unit 10 is configured to include a power generation unit 20, a storage battery 31 that charges the power generated by the power generation unit 20 via a charging circuit 32 and discharges it via a discharging circuit 33, a power storage information acquisition means that is connected to the storage battery 31 and acquires power storage information, and a communication control device 35 that receives instructions from an external management computer 70 and controls the discharge circuit 33 so as to be able to transmit power storage information to the outside and to control the discharge output from the storage battery 31, and the storage battery unit 30 that is connected between the power generation unit 20 and the power conditioner 40 is configured by integrating the storage battery 31, the charging circuit 32, the discharge circuit 33, the power storage information acquisition means, and the communication control device 35 into a single unit. The power storage information acquisition means in this embodiment can be configured using the above-mentioned voltmeter, ammeter, etc.

[0040] This allows, for example, all of the electricity generated by sunlight to be stored in the storage battery 31. Although this varies depending on the season, the approximate amount of electricity stored for that day can be determined for each solar storage battery unit 10, for example, around 3:00 PM. Based on this, for example, by individually controlling a selected plurality (or large number) of solar storage battery units 10 in accordance with the expected increase in electricity demand from around 5:00 PM, as opposed to the decrease in solar power generation, the solar network power plant system can freely discharge the required amount of electricity 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, allowing for effective use of solar energy. While this embodiment of the power generation system is designed in principle to sell all of the generated electricity, it goes without saying that the use of that electricity can be appropriately configured, such as by self-consuming the electricity used to operate the system. Furthermore, although this embodiment is a power generation system that is assumed in principle to charge all of the generated electricity into the storage battery 31, this is not limited to this, and a circuit may be added so that some of the generated electricity, or depending on the time period, all of it, is sent directly from the power generation unit 20 to the power conditioner 40 and supplied to the power transmission network 55.

[0041] Furthermore, although a large number of photovoltaic storage battery units 10, each consisting of a power generation unit 20 and a storage battery unit 30, will be installed, these photovoltaic storage battery units 10 can be manufactured at low cost through mass production, thereby 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 dispersed manner within the photovoltaic power plant 100, which has the advantage of not requiring additional space. That is, for example, by storing the storage battery units 30 in a waterproof housing to improve durability, they can be installed outdoors in a dispersed manner corresponding to each power generation unit 20.

[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 connected to an already installed power generation unit 20 as an add-on, the storage battery unit 30 can be standardized and can be easily installed in existing photovoltaic power plants 100. This makes it possible to mass-produce the storage battery unit 30, thereby reducing costs.

[0043] The information network of 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. Of course, other communication means such as a mobile phone line or Bluetooth can also be used.

[0044] Although the present invention relates to a power plant system for photovoltaic power generation, it is of course possible to add a power generation system using other natural energy sources such as wind power and hydropower in addition to the configuration described above. Furthermore, it is also possible to add a control and management system so that surplus commercial power generated by base load power sources can be charged and discharged by the storage battery 31 in accordance with predicted power demand.

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

[0046] REFERENCE SIGNS LIST 10 Photovoltaic storage battery unit 20 Power generation unit 21 Photovoltaic power generation panel 30 Storage battery unit 31 Storage battery 32 Charging circuit 33 Discharge circuit 35 Communication control device 40 Power conditioner 45 Test wattmeter 50 Electric power company 55 Power transmission network 60 Internet 70 External management computer 100 Photovoltaic power plant

Claims

1. A solar network power plant system in which a plurality of solar power plants are connected by a power transmission network, wherein each of the plurality of solar power plants is provided with a power generation unit that generates power from sunlight as a terminal unit where solar power generation and storage are performed and connected to the power transmission network via a power conditioner, 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 to form a solar storage battery unit, wherein the plurality of solar storage battery units are connected to an external management computer via a communication network by each of the communication control devices, separately from a network connected to a power company via a calibration wattmeter, so that the solar storage battery units are virtually integrated as a solar network power plant and are managed by the external management computer, wherein identification information attached to the communication control device so as to identify each of the solar storage battery units, unique information linked to the identification information, which includes at least information on the installation location of each of the solar storage battery units, and storage information which is variable information linked to the identification information, which includes at least information on the amount of stored power, which is related to each of the solar storage battery units, A solar network power plant system comprising: an information network that enables external information regarding power demand, which is variable information, and power demand information to be accessible to the external management computer; and 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 power stored in the solar network power plant can be discharged to a power transmission grid at any time and in any amount.

2. The solar network power plant system according to claim 1, characterized in that the power storage information includes information on the amount of stored power estimated by measuring the 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 a solar network power plant system according to any one of claims 1 to 3 under control of the external management computer, comprising the steps of: ascertaining, by the external management computer, an amount of stored power from power storage information from each of the solar storage battery units; ascertaining, by the external management computer, an amount of power demand predicted from the power demand information; creating, by the external management computer, a discharge output plan 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 grid; 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 discharge output plan.

5. A method for operating a solar network power plant system as described in claim 4, characterized in that it includes 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 voltage and output current of the battery that can be obtained over time by measuring the output voltage and output current of the battery, the information being information on the output power amount discharged to a power grid by controlling the discharge output for each of the solar storage battery units, and correcting plans and controls relating to the discharge output of each of the solar storage battery units by the external management computer.

6. A method for operating a solar network power plant system according to claim 5, further comprising a step of: determining an operating status of the solar power plant by using the external management computer to compare 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 from 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 relating to the discharge output of each of the solar storage battery units by the external management computer.

7. The solar storage battery unit comprises: the power generation unit; the storage battery that charges the power generated by the power generation unit via a charging circuit and discharges it via a discharging circuit; a storage battery information acquisition means that is connected to the storage battery and acquires storage information; and the communication control device that receives instructions from the external management computer and controls the discharge circuit so as to transmit the storage information to the outside and control the discharge output from the storage battery, and the solar network power plant system described in claim 1, characterized in that the storage battery unit connected between the power generation unit and the power conditioner is constituted by integrating the storage battery, the charging circuit, the discharging circuit, the storage battery information acquisition means and the communication control device into an integral unit.

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