JPH05244725A - Power generating device and operating method thereof, composite system of solar light power generating device and superconductive energy storage device, and operating method thereof - Google Patents

Abstract

PURPOSE:To permit the independent operation of both the devices by a method wherein a superconductive energy storage device is connected in parallel to a solar battery through DC buses so that the solar light power generating device and the superconductive energy storage device can be separated from a circuit. CONSTITUTION:An electric power system 30 is connected to an electric power converting device 9 through a switch 11 and a transformer 10. A superconductive energy storage device consisting of a superconductive coil 2 is connected in parallel to a solar battery 1 through DC buses. The converting device 9 accommodates an AC/DC converter and a DC/AC converter A controller 21 turns on/off the converting device 9 and self arc-extinguishing elements 4, 5 by signals from a power detector 18 and an energy transporting amount detector 20 to store the output of the solar battery 1 into the superconductive coil 2 or discharge it into the power system 30 through inverter operation or give-and-takes the energy between the superconductive coil 2 and the power system 30 regardless of the solar battery and effects independent operation or combined operation. According to this method, solar energy can be utilized effectively with a simple device and a low loss.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator, an operating method thereof, a combined system of a photovoltaic power generator and a superconducting energy storage device, and an operating method thereof, and more particularly to a power system through a power converter. A power generation device suitable for a solar power generation device to be connected or a superconducting energy storage device connected to a circuit of a fuel cell power generation device, an operating method thereof, and a composite of a solar power generation device and a superconducting energy storage device The present invention relates to a system and its operating method.

[0002]

2. Description of the Related Art In general, a solar power generation device including a solar cell connected to an electric power system through a power conversion device has a circuit to which a superconducting energy storage device is connected.

As an example of the operation method of the solar power generation device, a method of storing generated power from a solar cell and surplus power at night in a superconducting energy storage device to compensate for peaks in seasons and time zones when power demand is high, In addition, there is a method of compensating for load fluctuations that are connected to the power system and occur in a short time not only by the generated power of the solar cell but also by the high-speed response of the superconducting energy storage device.

As circuit configurations capable of realizing the above-mentioned operation system, there are a system in which a solar power generation device and a superconducting energy storage device are connected by a power system, and a system in which a solar cell and a superconducting coil are connected by direct current.

As a method of connecting the solar cell and the superconducting coil with direct current, there are a method of connecting the solar cell and the superconducting coil in series, and a method of connecting the solar cell and the superconducting coil in parallel.

[0006] For example, regarding the former, the proceedings of the National Conference of the Institute of Electrical Engineers of Japan, Electricity and Energy Division, 1990, P283-
P288.

As shown in FIG. 3, the solar power generation device described in this abstract includes a backflow prevention diode 22, a superconducting coil 2 connected in series with a solar cell 1, and a backflow prevention diode 22 ,.
Smoothing reactor 23, capacitor 7, step-down chopper 12 that controls the current flowing in superconducting coil 2, superconducting coil 2
Of the superconducting coil 2 and an electric power converter 9 for converting the electric current of the superconducting coil 2 into an alternating current, and are connected to the electric power system 30 via the electric power converter 9.

Electric power can be stored in the superconducting coil 2 from both the solar cell 1 and the electric power system 30, and the electric power converter 9 is operated as an inverter when necessary.
It is designed to supply energy to the grid.

Regarding the latter, JP-A-64-19929
There is a solar power generation device described in the publication.

This is a system in which the cooling system of the superconducting coil is used to lower the temperature of the solar cell below the normal operating temperature to increase the power generation efficiency of the solar cell, but it is connected to a power system independent from other power systems. Is a device for supplying electric power to a load.

[0011]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the case of a configuration in which the solar cell 1 and the solar cell 1 are connected in series, a circuit in which the solar power generation device and the superconducting energy storage device cannot operate independently (hereinafter, referred to as operation of only the solar power generation device and operation of only the superconducting energy storage device) is not possible. Due to the configuration, the voltage fluctuation due to the switching of the step-down chopper 12 that controls the constant voltage of the solar cell 1 becomes the AC loss of the superconducting coil 2.

Further, when the generated electric power of the solar cell 1 is stored, the bypass pair operation of the inverter is required, so that the loss due to the forward voltage drop of the semiconductor element increases.

Further, when the electric power of the electric power system 30 is stored, the forward voltage drop of the reflux diode 3 connected in series to the superconducting coil 2 becomes a loss.

Further, since the step-down chopper 12 is composed of non-self-extinguishing type elements, there is a drawback that the number of circuit constituent elements is large, and it cannot be a highly efficient solar power generation device.

On the other hand, since the solar power generation device described in Japanese Patent Laid-Open No. 64-19929 is a power generation device independent of other power systems, an operation for storing surplus power of the power system in the superconducting energy storage device. Therefore, it is not possible to actively use energy effectively. In addition, it is not possible to operate the system to connect it to the power system and suppress fluctuations in the system. The present invention has been made in view of the above points, and a first object thereof is to independently operate a photovoltaic power generation device including a solar cell, or a fuel cell power generation device including a fuel cell and a superconducting energy storage device. A second object is to reduce the number of circuit components to operate the device with low loss and to enable stable and highly efficient power generation, an operating method thereof, and a solar power generation device and a superconducting energy storage device. And a method of operating the same.

[0016]

According to the present invention, the first object is to configure a superconducting energy storage device in parallel with a DC bus connecting an electric power converter and a solar cell or a fuel cell. To be achieved. A second object is a circuit in which a first self-arc-extinguishing element is connected in series to a superconducting coil in which a free wheeling diode is connected in parallel, and a series circuit in which a first opening / closing means and a capacitor are connected in parallel with a solar cell. , A series circuit of a power converter connected to the power system and a second opening / closing means for opening / closing between the power converter and a circuit in which a second self-extinguishing element is connected in series to the solar cell are connected in parallel. An AC circuit that is configured as a whole or is provided between a power system and a power conversion device, and includes a second switch for disconnecting the solar power generation device from the power system, and a transformer for insulation. , A DC circuit breaker for protecting a DC circuit and a second self-arc-extinguishing element for controlling the generated power of the solar cell are connected in series between the power conversion device and the solar cell, Once store electricity And a DC circuit that is connected in series with the capacitor, and a first switch for disconnecting this capacitor from the circuit is connected in parallel with the solar cell, and a superconducting coil in parallel with the solar cell. And an energy storage circuit configured by being connected to each other.

[0017]

The power generator of the present invention has a structure in which the superconducting energy storage device is connected to the solar cell or the fuel cell in parallel with a DC bus, so that the solar power generation device or the fuel cell power generation device and the superconducting energy storage device are connected in a circuit. Since they can be electrically separated from each other, the solar power generation device or the fuel cell power generation device and the superconducting energy storage device can be independently operated.

Further, since the backflow prevention diode and the smoothing reactor of the solar cell are omitted from the circuit, and the energy transfer element is a self-turn-off element to reduce the number of circuit components, the circuit components are reduced and the device is reduced. It can be operated with low loss, and stable and highly efficient power generation becomes possible.

[0019]

The present invention will be described in detail below with reference to the illustrated embodiments. The same reference numerals are used for the same reference numerals.

FIG. 1 shows a position example of a main circuit configuration diagram in a composite system of a photovoltaic power generator and a superconducting energy storage device of the present invention.

In the figure, 30 is a power system, 9 is a power converter, and this power system 30 and power converter 9
The switch 1 which is the first opening / closing means for disconnecting the solar power generation device including the solar cell 1 from the power system 30 between
1 and a transformer 10 for insulation are provided to form an AC circuit. In addition, since the power conversion device 9 performs the single operation or the combined operation of the solar power generation device and the superconducting energy storage device, as shown in FIG. 2, the power conversion device 9-1 for the superconducting energy storage device and the solar power generation. The power conversion device for device 9-2 is used.

On the other hand, a DC circuit breaker 8 for protecting the DC circuit and a second self-extinguishing element 5 for controlling the generated power of the solar cell 1 are connected in series between the power converter 9 and the solar cell 1. And a capacitor 7 for temporarily storing the generated power of the solar cell 1, and a switch 6 connected in series with the capacitor 7 for disconnecting the capacitor 7 from the circuit.
And are connected in parallel to the solar cell 1 to form a DC circuit.

Further, the superconducting coil 2 is connected in parallel to the solar cell 1 via a DC bus to form an energy storage circuit. A reflux diode 3 is connected in parallel to the superconducting coil 2 to the energy storage circuit, and further has a function of separating the energy storage circuit and the solar cell circuit and a function of transferring the electrostatic energy of the capacitor 7 to the superconducting coil 2. One self-extinguishing element 4 is connected in series.

Further, regarding the control system, the DC current and DC voltage of the solar cell 1 and the DC current of the superconducting coil 2 are detected by the DC measuring current transformers 14 and 15, and the detected DC current and DC voltage are used as energy. The energy transfer amount is detected by inputting it to the transfer amount detector 20. In addition, power system 3
It is appropriate that the controller 21 constantly monitors the power detector 18 that detects the power supplied to 0 by the AC measuring transformer 16 and the AC measuring current transformer 17 and the energy transfer amount detector 20. Gate circuit 1 for various gate pulse commands
Control is performed by applying the power conversion device 9 to the power conversion device 9, the first and second self-extinguishing elements 4 and 5.

Next, the operation of this apparatus will be described.

First, as a basic operation of this apparatus, the operation of storing the generated electric power of the solar cell 1 in the superconducting coil 2 in mode 1, the energy stored in the superconducting coil 2 is operated by the inverter of the power converter 9-1. The operation of releasing the generated power of the solar cell 1 to the power system 30 by operating the power conversion device 9-2 with the inverter without using the superconducting coil 2 is the mode 3, power Mode 4 is an operation in which the power of the grid 30 is forward-converted by the power converter 9-1 and stored in the superconducting coil 2.

Therefore, each mode will be specifically described as follows.
In mode 1, first, the gate block of the power converter 9 and the DC breaker 8 are opened to perform the power converter 9
Prevent energy from flowing into the side. Next, the switch 6 is turned on to control the second self-arc-extinguishing element 5, the generated power of the solar cell 1 is charged to the capacitor 7 to the set voltage, and then the second self-extinguishing element 5 is turned on. When turned off, the first self-extinguishing element 4 is turned on to turn on the capacitor 7
The superconducting coil 2 is excited by the discharge of. Further, when the discharge of the capacitor 7 is completed, the freewheeling diode 3 becomes conductive, and the freewheeling diode 3 and the superconducting coil 2 form a closed loop, energy is transferred to the superconducting coil 2, and the first self-extinguishing element 4 is turned off. To do. Here, the second self-extinguishing element 5 is turned on, the above operation is monitored by the energy transfer amount detector 20 repeatedly until the target value is reached, and the control device 21 controls the energy to the superconducting coil 2. Is stored.

In mode 2, the second self-extinguishing element 5 and the switch 6 are turned off, the first self-extinguishing element 4 and the DC breaker 8 are turned on, and then the power converter 9-1 is used. The reverse voltage is once applied to the return diode 3 to turn it off, and then the power converter 9-1 is operated by an inverter to release the energy stored in the superconducting coil 2 to the power system 30.

In the mode 3, the circuit of the solar cell 1 and the superconducting coil are turned on by turning on the switch 6, the second self-extinguishing element 5 and the DC breaker 8 and turning off the first self-extinguishing element 4. The circuit of No. 2 is electrically disconnected, and the solar cell 1 that supplies the generated power of the solar cell 1 to the power system 30 via the power converter 9-2 is operated independently.

In mode 4, the second self-extinguishing element 5,
Then, the switch 6 is turned off, the DC circuit breaker 8 and the first self-extinguishing element 4 are turned on to disconnect the solar cell 1 from the circuit, and then the power converter 9-1 is operated as a converter to operate the power system 30. Electric power is stored in the superconducting coil 2.

Further, in the apparatus of this embodiment, the following operating method is possible by combining the above basic modes.

First, when used as a power supply source for a specific load of the power system 30, the energy transfer amount detector 2
While the controller 21 constantly monitors 0, the operation of mode 1 is repeated to control the stored energy of the superconducting coil 2 until it reaches a target value. When the stored energy of the superconducting coil 2 reaches the target value, the operation is switched to mode 2. Thereby, electric power can be supplied to the specific load of the electric power system 30.

On the other hand, when compensating for a short-term load fluctuation of the power system 30, the superconducting coil 2 is preliminarily stored with energy in the mode 1 or mode 4 operation. At this time, when the load increases, the generated power of the solar cell 1 is constantly monitored, and if the generated power of the solar cell 1 is larger than the set value, the power is discharged to the power system 30. On the contrary, if the generated power of the solar cell 1 is smaller than the set value, the stored energy of the superconducting coil 2 is changed to the power system 30.
To release. Further, when the load decreases, the superconducting coil 2 absorbs energy. This makes it possible to compensate for short-term load fluctuations in the power system 30.

Furthermore, when leveling the daily load fluctuations of the power system 30, the surplus power of the power system 30 is stored in the superconducting coil 2 in the operation of mode 4, and the solar cell 1 of the solar cell 1 is loaded at the peak load in the daytime. The generated power is compared with the set value, and when the generated power is large, the power is released to the power system 30 in the mode 3 operation, and when the generated power is small, the stored energy of the superconducting coil 2 is stored in the power system in the mode 2 operation. Release to 30. This makes it possible to equalize the daily load fluctuations of the power system 30.

It goes without saying that the control device 21 controls the operation in each of the above modes appropriately.

By adopting each of the embodiments of the present invention as described above, the solar power generation device and the superconducting energy storage device can be operated independently, and the backflow prevention diode and the smoothing reactor of the solar cell are connected from the circuit. Since the number of circuit components is reduced by using the energy transfer element as a self-extinguishing element, the number of circuit components can be reduced, the device can be operated with low loss, and stable and highly efficient power generation can be achieved. In addition, by combining the respective operation modes of the present embodiment, it is possible to supply power to a specific load of the power system, and of course, it is possible to compensate for short-term load fluctuations of the power system and to shorten the power system. It is possible to obtain the various effects that the load change over time can be compensated and further the daily load change of the power system can be leveled.

In the above-mentioned embodiment, the solar cell is used to combine the superconducting energy storage device with each other. However, instead of the solar cell, a fuel cell is used to combine the superconducting energy storage device with the superconducting energy storage device. The same effects as those obtained by using the solar cell can be obtained by using the same method as in the example.

[0038]

According to the power generator of the present invention, the method of operating the same, the combined system of the photovoltaic power generator and the superconducting energy storage device, and the method of operating the same, the power converter and the solar cell, or A power generator configured by connecting a superconducting energy storage device in parallel to a direct current bus connecting a fuel cell, and a superconducting energy connected in parallel to a solar power generator or a direct current bus connecting a fuel cell power generator and a power converter The storage device is electrically disconnected, and the solar power generation device, or the operation method of the solar power generation device that supplies the generated power of the fuel cell power generation device to the power system through the power conversion device is used. Switching between the single operation and the combined operation of the power generation device or the fuel cell power generation device and the superconducting energy storage device can be easily performed.

Further, a solar cell, a control means for controlling the output of electric power generated by the solar cell, a superconducting energy storage device connected in parallel with the solar cell, and a superconducting energy storage device for connecting the solar cell to the solar cell. An energy transfer device for transferring generated energy, which is a composite system of a solar power generation device and a superconducting energy storage device, which are connected to a power system via a power conversion device, and an operating method thereof. Therefore, since the circuit components can be reduced, the device can be operated with low loss, and stable and highly efficient solar power generation can be performed, so that the energy can be effectively used.

[Brief description of drawings]

FIG. 1 is a main circuit configuration diagram showing an embodiment of a combined system of a solar power generation device and a superconducting energy storage device of the present invention.

FIG. 2 is a configuration diagram of the power conversion device shown in FIG.

FIG. 3 is a diagram showing a main circuit configuration of a conventional solar power generation device.

[Explanation of Codes] 1 ... Solar cell, 2 ... Superconducting coil, 3 ... Reflux diode, 4 ... First self-extinguishing element, 5 ... Second self-extinguishing element, 6 ... Switch, 7 ... Capacitor, 8 ... DC circuit breaker, 9 ... Power converter, 9-1 ... Power converter for superconducting energy storage device, 9-2 ... Power converter for photovoltaic power generator, 10 ... Transformer, 11 ... Switch, 18 ... Electric power detector, 19 ... Gate circuit, 20 ... Energy transfer amount detector, 21 ... Control device.

Claims (22)

[Claims] 1. A power generator including a solar cell connected to a power system via a power converter, in which a superconducting energy storage device is connected in parallel to a DC bus connecting the solar cell and the power converter. A power generation device characterized by: 2. An output control means for controlling an output of the solar cell and an energy transfer device for transferring generated energy of the solar cell to the superconducting energy storage device, between the power conversion device and the solar cell. The power generator according to claim 1, wherein 3. A circuit in which a first self-extinguishing element is connected in series to a superconducting coil in which a return diode is connected in parallel, a series circuit in which a first opening / closing means and a capacitor are connected in parallel to a solar cell, and a power system. A series circuit of a connected power conversion device and a second opening / closing means for opening / closing the power conversion device, and a circuit in which a second self-extinguishing element was connected in series to the solar cell were connected in parallel to form the whole. A power generator characterized in that. 4. A solar cell that is connected to a power system via a power conversion device and a superconducting energy storage device that is connected in parallel to a DC bus connecting the solar cell and the power conversion device are electrically disconnected. A method of operating a photovoltaic power generation device, characterized in that power generated by the solar cell is supplied to the power system via the power conversion device. 5. A circuit in which a first self-extinguishing element is connected in series to a superconducting coil in which a free wheel diode is connected in parallel, a series circuit in which a first switching means and a capacitor which are connected in parallel to a solar cell are connected in series, and to a power system. A series circuit of a connected power conversion device and a second opening / closing means for opening / closing between the power conversion device and a circuit in which a second self-extinguishing element is serially connected to a solar cell are connected in parallel, and the first self The solar cell is electrically disconnected by closing the arc extinguishing element and opening the second self-extinguishing element, and the stored energy stored in the superconducting coil is converted into the power conversion device. A method for operating a power generation device, characterized in that the power is supplied to the electric power system via a power line. 6. A circuit in which a first self-extinguishing element is connected in series to a superconducting coil in which a return diode is connected in parallel, a series circuit in which a first switching means and a capacitor which are connected in parallel to a solar cell are connected in series, and to a power system. A series circuit of a connected power conversion device and a second opening / closing means for opening / closing between the power conversion device and a circuit in which a second self-extinguishing element is serially connected to a solar cell are connected in parallel, and the first opening / closing circuit is provided. With the means closed, the second opening and closing means is opened, the first self-arc-extinguishing element, and the second self-arc-extinguishing element are respectively closed to the capacitor from the solar cell. The generated power is charged, the energy charged in the capacitor is transferred to the superconducting coil, and the generated power of the solar power generation device is stored in the superconducting energy storage device by repeating this operation. The method of operating a complex system of photovoltaic power generator and the superconducting energy storage device for. 7. A solar power generation device including a solar cell connected to a power system via a power conversion device, and a superconducting energy storage device connected in parallel to a DC bus connecting the solar power generation device and the power conversion device. However, when the generated power of the solar power generation device is larger than a set value or substantially matches, the superconducting energy storage device is electrically cut off and power is supplied to the power system in an isolated operation of the solar power generation device. When the generated power of the solar power generation device is smaller than a set value, the solar power generation device is electrically disconnected and the superconducting energy storage device operates independently to supply power to the power grid. A method of operating a combined system of a solar power generation device and a superconducting energy storage device, characterized in that 8. A solar power generation device including a solar cell connected to a power system via a power conversion device, the solar power generation device being provided between the power system and the power conversion device, and separating the solar power generation device from the power system. AC switch composed of a second switch for switching and a transformer for insulation, and a DC circuit breaker for protecting a DC circuit and generated power of the solar cell between the power conversion device and the solar cell. A second self-extinguishing element to be controlled is connected in series, a capacitor for temporarily storing the power generated by the solar cell and a series connection with the capacitor, and a first switch for disconnecting the capacitor from the circuit are provided. Solar light comprising a direct current circuit configured by being connected in parallel with the solar cell, and an energy storage circuit configured by connecting a superconducting coil in parallel with the solar cell. Collector. 9. The energy storage circuit has a freewheeling diode connected in parallel with the superconducting coil, a function of disconnecting the energy storage circuit from the solar cell circuit, and a function of transferring electrostatic energy of the capacitor to the superconducting coil. 9. The solar power generation device according to claim 8, wherein the first self-arc-extinguishing element having is connected in series. 10. A circuit in which a first self-extinguishing element is connected in series to a superconducting coil in which a free wheeling diode is connected in parallel, a series circuit in which a first opening / closing means and a capacitor which are connected in parallel to a solar cell are connected to a power system. A series circuit of a connected power conversion device and a second opening / closing means for opening and closing the space between the power conversion device and the second self-extinguishing element is connected in parallel to a solar cell, and is configured in parallel. An energy transfer amount detector for detecting an energy transfer amount by detecting a direct current, a direct current voltage of the solar cell and a direct current of the superconducting coil; a power detector for detecting electric power supplied to the power system; While constantly monitoring the power supplied to the power system in the power detector, and the energy transfer amount of the solar cell and the superconducting coil in the energy transfer amount detector,
A solar power generation device and a superconducting energy storage device, comprising: a control device that controls by applying an appropriate gate pulse command to the power conversion device, the first self-extinguishing element, and the second self-extinguishing element. Complex system with. 11. A means for preventing energy from flowing into a power conversion device side connected to a power system, and then turning on a first switch connected in parallel with the solar cell to turn on the solar cell. The second self-extinguishing element connected in series is controlled, and the power generated by the solar cell is connected to a capacitor connected in series with the first switch and in parallel with the solar cell. Is charged to a set voltage, then the second self-extinguishing element is turned off, and further the first self-extinguishing element connected in series with the superconducting coil connected in parallel to the solar cell. Is turned on to excite the superconducting coil by discharging the capacitor, and when the discharging of the capacitor is completed, the freewheeling diode connected in parallel with the superconducting coil becomes conductive to form a closed loop with the superconducting coil. Energy is transferred, the first self-extinguishing element is turned off, and thereafter this operation is repeated until the target value is reached, and the power generated by the solar cell is stored in the superconducting coil. A method for operating a combined system of a device and a superconducting energy storage device. 12. A second self-extinguishing element connected in series with a solar cell and a first switch connected in parallel with the solar cell are turned off and connected in parallel with the solar cell. The first self-extinguishing element connected in series with the superconducting coil, the power converter connected to the power grid, and the DC circuit breaker connected in series between the solar cell and In the power converter, once the reverse voltage is applied to the freewheeling diode connected in parallel with the superconducting coil, it is turned off.
Then, the power converter is operated by an inverter, and the stored energy of the superconducting coil is supplied to the electric power system. A method of operating a combined system of a photovoltaic power generator and a superconducting energy storage device. 13. A second self-extinguishing element connected in series with a solar cell, a first switch connected in parallel with the solar cell, and a power converter connected to a power system, Turn on the DC breaker connected in series with the solar cell
And the first self-arc-extinguishing element connected in series with the superconducting coil connected in parallel to the solar cell is turned off to disconnect the circuit of the solar cell from the circuit of the superconducting coil, Is supplied to the electric power system through the power conversion device, and a method for operating a combined system of a solar power generation device and a superconducting energy storage device. 14. A power converter connected to a power system while turning off a second self-extinguishing element connected in series with the solar cell and a first switch connected in parallel with the solar cell. A first self-extinguishing element connected in series with a DC circuit breaker connected in series between the device and the solar cell and a superconducting coil connected in parallel with the solar cell is turned on.
And disconnecting the solar cell from the circuit, and then performing a converter operation of the power conversion device to store the electric power of the power system in the superconducting coil. A composite of a solar power generation device and a superconducting energy storage device. How to operate the system. 15. The operation mode according to claim 11 is repeated until the stored energy of the superconducting coil reaches a target value.
13. A photovoltaic power generation device, characterized in that when the stored energy of the superconducting coil reaches a target value, the stored energy of the superconducting coil is supplied to a specific load of a power system by switching to the operation mode according to claim 12. And method for operating a combined system of a superconducting energy storage device. 16. When the operation mode according to claim 11 or 14 stands by in a state where energy is stored in the superconducting coil in advance, and when the load of the power system increases, the generated power of the solar cell exceeds the set value. Solar power generation characterized by supplying the generated power of the solar cell to the power system if larger, and conversely supplying the stored energy of the superconducting coil to the power system if the generated power of the solar cell is smaller than a set value. A method for operating a combined system of a device and a superconducting energy storage device. 17. When the operation mode according to claim 11 or 14 stands by in a state where energy is stored in the superconducting coil in advance, and the load of the power system increases, the generated power of the solar cell is higher than the set value. If it is larger, the generated power of the solar cell is supplied to the power system. Conversely, if the generated power of the solar cell is smaller than the set value, the stored energy of the superconducting coil is supplied to the power system, and the load on the power system is reduced. In this case, the method for operating a combined system of a photovoltaic power generation device and a superconducting energy storage device, characterized in that the superconducting coil absorbs energy. 18. Surplus power of the electric power system is stored in the superconducting coil in the operation mode according to claim 14, and the generated power of the solar cell is compared with the generated power of the solar cell at the peak load in the daytime. When it is large, the generated power of the solar cell is supplied to the power system in the operation mode according to claim 13, and when the generated power of the solar cell is small, the stored energy of the superconducting coil is supplied to the power system in the operation mode according to claim 12. A method for operating a combined system of a solar power generation device and a superconducting energy storage device, which is characterized by supplying. 19. A solar power generation device including a solar cell connected to a power system via a power conversion device, and a superconducting energy storage device including a superconducting coil connected to a circuit of the solar power generation device. A composite system of a solar power generation device and a superconducting energy storage device, which is configured to be able to operate independently. 20. A solar cell, a control means for controlling the output of electric power generated by the solar cell, a superconducting energy storage device connected in parallel with the solar cell, and a superconducting energy storage device for connecting the solar cell to the solar cell. A solar power generation system, comprising: an energy transfer device that transfers generated energy, and these are connected to a power system via a power conversion device. 21. A power generator including a battery connected to a power system via a power converter, wherein a superconducting energy storage device is connected in parallel to a DC bus connecting the battery and the power converter. Power generation device characterized by. 22. The power generator according to claim 21, wherein the battery is a solar cell or a fuel cell.