JP6556482B2 - Power storage control system - Google Patents

Description

  The present invention relates to a power storage control system in which a power generation system using renewable energy and a power storage system are connected, and an operation control method thereof.

  Currently, the introduction of renewable energy is recommended for reasons such as environmental problems and reduction of risks when power generation facilities are shut down. As a power generation system using these renewable energies, each electric power company accepts the power of renewable energy by connecting a renewable energy power generation facility to their grid. On the other hand, since renewable energy fluctuates, output fluctuation mitigation technology is required.

  In the conventional technology for mitigating output fluctuations of renewable energy by storage batteries, output adjustment is performed following a wattmeter, but output fluctuations of renewable energy cannot be predicted, and thus output fluctuations cannot be completely eliminated. In addition, power generation systems that use renewable energy may interfere with the stable supply of electricity if the balance between power demand and supply is not maintained. There are restrictions on the introduction of stable renewable energy for the purpose of selling electricity. Further, there is a limit to the surplus power that can suppress the power generation output of the power plant in order to maintain a supply-demand balance. For example, the amount of renewable energy that can be connected is determined on the basis of the situation where demand is the least. In addition, measures may be taken to reduce the power generated by renewable energy during times when the supply-demand balance is severe.

  As a background art related to this technical field, there is JP 2014-1113034 (Patent Document 1). Patent Document 1 discloses a power generation facility that uses renewable energy, a first storage battery that charges power supplied from the power generation facility, a second storage battery that supplies power to a system, and the first storage battery. And a connection switching device that switches the second storage battery, and a control device that controls the connection switching device, the switching determined based on the power generation amount prediction of the power generation facility and the demand prediction of the system The timing describes that the control device performs control to switch the connection switching device.

JP 2014-113034 A

  In the above-mentioned Patent Document 1, when the generated power is effectively used without being discarded, the battery capacity that is twice as much as the generated power per day of the power generation facility is required, which reduces the installation space and further increases the cost. is there. In addition, when switching the first and second storage batteries while reducing the influence on the system, it is necessary to switch the output finely after distributing the output, the connection switching device becomes complicated, and the cost is similarly increased. There is a problem.

  Accordingly, an object of the present invention is to provide a power storage control system using renewable energy that solves the above-described problems and realizes stabilization of the system easily and at low cost, and an operation control method thereof.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. To give an example, a power storage control system includes a renewable energy power conversion device, a power storage power conversion device, and the power system. It has a disconnection device that is connected or disconnected, and a control device that controls them, and the control device uses the generated power generated by the renewable energy power generation device in a state where the disconnection device is disconnected, for renewable energy. Rechargeable energy power converter for charging a storage battery connected to a power storage device for power storage via a power conversion device, and power from a renewable energy power generation device or power from a storage battery in a state where a disconnection device is connected Alternatively, the power is supplied to the power system via the power storage power conversion device.

  It is possible to provide a power storage control system using renewable energy that realizes stabilization of a system easily and at low cost, and an operation control method thereof.

It is a whole lineblock diagram of the power generation system in a present Example. It is an assumption electric power generation graph of 1 day in the case of no control of the solar power generation system at the time of fine weather in a present Example. It is an operation | movement control flowchart of the electrical storage control system in a present Example. It is an operation | movement control flowchart of the electrical storage control system in a present Example. It is a block diagram which shows the operation control state in the power sale mode of the electrical storage control system in a present Example. It is a block diagram which shows the driving | running control state in the charge mode preliminary | backup operation | movement of the electrical storage control system in a present Example. It is a block diagram which shows the driving | running control state in the charge mode of the electrical storage control system in a present Example. It is a block diagram which shows the driving | running control state in the discharge mode of the electrical storage control system in a present Example. It is the figure which showed the relationship with the time of the day of the photovoltaic power generation electric power of the electrical storage control system in a present Example, electric power selling electric power, and storage battery charging / discharging electric power.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an overall configuration diagram of a power generation system according to the present embodiment. In FIG. 1, 1 is a power system, 2 is a transformer, 3 is a disconnecting device, 4 is a photovoltaic power generation panel as an example of renewable energy, 5 is a power conversion device for photovoltaic power generation, 6 is a storage battery, 7 is The power storage device for power storage 8 is a control device. Moreover, 9 which put together the photovoltaic power generation panel 4 and the power converter device 5 for photovoltaic power generation is a photovoltaic power generation system, and 10 which put together the storage battery 6 and the power converter device 7 for electrical storage is a power storage system. In addition, the power storage control system 20 in this embodiment is configured by a disconnecting device 3, a control device 8, a solar power generation power conversion device 5, and a power storage power conversion device 7 connected to the power system 1. Here, the power converter is a so-called power conditioner, and is a device that converts AC to DC or DC to AC, or changes the voltage. The disconnecting device 3 is a device that links or disconnects the system, and a typical one is a magnet conductor. The control device 8 is a controllable device such as a PLC (Programmable Logic Controller).

  The disconnecting device 3 interconnects or disconnects the power system 1, the photovoltaic power generation system 9, and the power storage system 10.

  The control device 8 controls the interconnection or disconnection of the disconnecting device 3, the power generation of the solar power generation system 9, and the charge / discharge control of the power storage system 10. The control device 8 charges the power storage system 10 with power generated by the photovoltaic power generation system 9 when the disconnecting device 3 is disconnected, and sunlight when the disconnecting device 3 is connected. Control is performed so that power from the power generation system 9 or power from the power storage system 10 is supplied to the power system 1.

  Further, for the control of the control device 8, the charge / discharge power value of the power storage system 10 and the power generation power value of the solar power generation system 9 are obtained from, for example, the power storage power conversion device 7 or the solar power generation power conversion device 5. If it is a specification that can be obtained or cannot be measured, it is measured with a power meter that measures power, and the above control is performed according to the power value.

  Next, specific operation control of the power storage control system 20 in the present embodiment will be described.

  First, as a premise, FIG. 2 shows an assumed generated power graph for a day when the solar power generation system during clear weather is not controlled. In FIG. 2, the horizontal axis represents the time of one day, and the vertical axis represents the photovoltaic power generation. As shown in FIG. 2, sunlight hits the solar panel from about 5 o'clock in the morning, and the generated power increases, reaches a peak at 12:00 noon, and there is no solar radiation at 20:00, resulting in zero generated power. And In the following description, the sunshine hours are based on this graph, and the startup control of the solar system based on the presence or absence of solar sunshine is assumed to be working at all times, and is not particularly described.

  3A and 3B show flowcharts of operation control of the power storage control system in the present embodiment when the photovoltaic power generation system generates power according to FIG. In FIG. 3A, when starting operation is started, the photovoltaic power generation system is connected to the grid, and the SOC value of the storage battery is 20%. Here, SOC is an abbreviation for State of Charge, which indicates the state of charge of the storage battery and is fully charged at 100%.

  First, at the start of the starting operation, setting items are set in S01. That is, (1) charge mode start time, (2) charge mode end time, (3) discharge mode start time, (4) discharge mode end time, (5) charge start SOC value [%], (6) discharge power [KW], (7) Charging mode preliminary operation start time is set. Next, in S02, an operation for starting operation is performed. In the power storage control system in this embodiment at this time, as shown in FIG. 4, the control device 8 is activated, and the disconnecting device 3 connects the power system 1, the photovoltaic power generation system 9, and the power storage system 10. In this state, the photovoltaic power generation system 9 is in an operating state, and the power storage system 10 is in a stopped state. This operation control operation is hereinafter referred to as operation control A. Here, although the solar power generation system 9 is in the operating state and the power storage system 10 is in the stopped state, the actual control is performed when the solar power generation power conversion device 5 in the solar power generation system 9 is in the operating state. The storage power converter 7 in the system 10 is in a stopped state. Hereinafter, the operation and stop state of the solar power generation system 9 and the power storage system 10 will be described as being operated and stopped as a system, but the solar power generation power conversion device 5 and the power storage system 10 in the solar power generation system 9 It may be replaced that the power storage power conversion device 7 is operating and stopped.

  Therefore, in the operation control A shown in FIG. 4, the power generated by the solar power generation system 9 can be supplied to the power system 1. In S03, the photovoltaic power generation system 9 becomes a voltage that can generate power from 5 o'clock, and in S04, power generation starts and power sales start at the same time. Thus, the operation control A is an operation control state in the power sale mode.

  Next, in S05, when (8) charging mode preliminary operation start time set at the start of the start-up operation is 8:00, the power storage system starts charging in the interconnected operation in S06. As shown in FIG. 5, the power storage control system in this embodiment at this time is in a state where the power generated by the solar power generation system 9 can be supplied to the power system 1, and the power storage system 10 is also charged. It is possible. Here, the interconnection operation is a state in which the system is connected to the grid and operating in a system that is grid-connected with commercial grid power. In this case, the photovoltaic power generation system 9 generates power. The power storage system 10 is charged with the generated power. This operation control operation is hereinafter referred to as operation control B. In step S07, the charging power is gradually increased, the generated power and the charging power are set to the same value, and the selling power is set to approximately 0 kW. This is because sudden fluctuations in the reverse power flow at the time of disconnection can be suppressed by controlling the power flowing back to the grid by charging to 0 kW. Then, in the next S08, the charging mode start time is reached, and then the charging mode is switched. Thus, the operation for switching without affecting the system is the charging mode preliminary operation, and (7) the charging mode preliminary operation start time is the time for starting the operation. This time, (1) the charging mode start time is set to 9:00, one hour before (9) the charging mode preliminary operation starting time is set, but this time is arbitrary, and can be several minutes, for example. It should be noted that in order to reduce the sold power to 0 kW without stopping the power generation, it is necessary to set the generated power = the charged power, and it is necessary to measure the sold power. Therefore, it is necessary to obtain generated power information from the photovoltaic power conversion device 5 or install a wattmeter for measuring the generated power. As described above, the operation control B is an operation control state in the charge mode preliminary operation.

  When the charging mode start time is reached in S08, the power generation of the solar power generation system is stopped in S09, the power storage system is stopped in S10, and the power storage system 10 and the solar power generation system 9 are connected using the disconnecting device 3 in S11. Disconnect from 1. In S11, the photovoltaic power generation system and the power storage system are disconnected from the grid 1 because the generated power is autonomously charged in the self-sustaining operation mode without reverse power flow while being disconnected and charged. This is because of the purpose. Moreover, the reason for temporarily stopping the photovoltaic power generation system and the power storage system in S09 and S10 is that this system is not a UPS (uninterruptible power supply). This is because it is necessary to stop.

  In S12, the power storage system 10 is activated in a self-sustaining operation, and the power generation of the solar power generation system 9 is resumed in S13 in FIG. 3B. At the same time, the generated power flows into the power storage system 10 and is charged. Here, self-sustained operation means that in a system that is grid-connected with commercial grid power, the system is disconnected from the grid and the consumer load (in this case, the photovoltaic power generation system) is directly operated by the system. State. As shown in FIG. 6, in the power storage control system in this example at this time, the disconnecting device 3 disconnects the power system 1, the solar power generation system 9, and the power storage system 10, and the solar power generation system 9 The generated power flows into the power storage system 10 and is charged. This operation control operation is hereinafter referred to as operation control C. In S14, it is checked whether the SOC value of the current power storage system has reached 100 [%], and charging is continued until it reaches 100 [%]. Thus, the operation control C is an operation control state in the charging mode.

  Next, when the charging mode end time is reached in S15, the power generation of the solar power generation system is stopped in S16, the power storage system is stopped in S17, and the power storage system 10 and the solar power generation system using the disconnecting device 3 in S18. 9 is connected to system 1. The reason why the solar power generation system and the power storage system are temporarily stopped in S16 and S17 is that the purpose is to switch the connection destination of the solar power generation system from the power storage system to the grid 1.

  In S19, the photovoltaic power generation system resumes power generation and resumes power sales. At this time, the power storage system continues to stop. The power storage control system in the present embodiment at this time is the operation control A operation shown in FIG. 4 and is in the operation control state in the power sale mode. Then, solar radiation disappears in S20, the power generation of the solar system stops, and the discharge mode start time is reached in S21.

  In S22, it is determined whether or not the SOC value of the current power storage system is higher than the set (5) charge start SOC value [%]. If not, the process returns to S03 without discharging. This means that the fact that the charge start SOC value and the current set value are below 20% means that sufficient power cannot be sold, and therefore no discharge is performed.

  When it is higher than the set (5) charge start SOC value [%], the power storage system 10 performs a grid connection operation in S23, and starts discharging at the set (6) discharge power [kW]. As shown in FIG. 7, in the power storage control system in this embodiment at this time, the disconnecting device 3 is connected to the power system 1, the solar power generation system 9, and the power storage system 10. Reference numeral 9 denotes a stopped state, in which the power storage system 10 is discharged in a grid operation. This operation control operation is hereinafter referred to as operation control D. Thus, the operation control D is an operation control state in the discharge mode. In S24, it is checked whether the SOC value of the current power storage system has reached the set (5) charge start SOC value [%], and discharging is continued until the SOC value is reached. In this operation example, this is a storage battery capacity that can sell enough power and reduce the SOC of the power storage system by discharging it to the SOC value at the start of charging, so that all of the photovoltaic power generated at the next charging time can be charged. This is to ensure If the discharge end time is reached before reaching the charge start SOC value, it is necessary to increase the discharge command value or extend the discharge time. Therefore, although not shown in this flowchart, control may be added to continue discharging when the storage battery SOC is higher than the discharge start SOC value when the discharge end time is reached.

  When the discharge mode end time is reached in S25, the power storage system is stopped in S26, the discharge mode is ended, and the process returns to S03.

  A calendar function may be introduced into the host control system to enable setting corresponding to the difference in the supply and demand balance depending on the season.

  Also, (8) Discharge start SOC value [%] is provided, and (8) Discharge start SOC value when the SOC of the battery is less than (8) Discharge start SOC value at the end of the charge mode in S15. It is good also as control which continues the charge to a stock battery until it secures as much as possible the electric power sales amount at night.

  Although the flowchart of the operation control of the power storage control system in the present embodiment has been described above, the relationship between the time of day and the electric energy will be described below. FIG. 8 is a diagram showing the relationship between the solar power generation power, the power sales power, and the storage battery charge / discharge power with respect to the time of each day.

  FIG. 8A shows the relationship between the photovoltaic power generation time and the time. 104 is set at the start of the start-up operation in FIG. 3A, and (4) discharge mode end time, and 107 is (7) charge mode preliminary operation start. Time, 101 indicates (1) charge mode start time, 102 indicates (2) charge mode end time, 103 indicates (3) discharge mode start time, and 106 indicates (6) discharge power. And A shows the operation control A in the power sale mode described in FIG. 3A, B shows the operation control B in the power sale mode preliminary operation, C shows the operation control C in the charge mode, D indicates the operation control D in the discharge mode.

  As shown in FIG. 8A, when the discharge mode end time 104 is reached, the power storage control system enters the operation control A state of the power sale mode, and the solar panel hits the solar panel as the sun rises, and the photovoltaic power generation increases. When the charging mode start time 101 is reached, the solar power generation system is temporarily stopped when the solar power generation system is disconnected from the grid 1 as described above. Become. Then, after the photovoltaic power generation system is disconnected from the grid 1, the operation of the photovoltaic power generation system is resumed and the photovoltaic power generation increases. In the state of the operation control C in the charging mode, the photovoltaic power generation reaches a peak, but since the power corresponds to the power sale prohibition time, the power storage system 10 is charged without going to the grid. When the charging mode end time 102 is reached, the solar power generation system is temporarily stopped when the solar power generation system is connected to the grid 1, as described above. Become. Then, after the photovoltaic power generation system is connected to the grid 1, the photovoltaic power generation system is restarted to increase the photovoltaic power generation power. After that, there is no solar radiation and the generated power becomes zero.

  FIG. 8B shows the relationship between the power sales power and the time. Since the power storage control system enters the power sales mode at the discharge mode end time 104, the power sales power increases as the photovoltaic power generation increases. To do. Then, when the charging mode preliminary operation start time 107 is reached, as described above, the power storage system starts charging in the grid operation, so that the electric power sales gradually decreases and becomes almost zero. This is to make it possible to suppress sudden fluctuations in the reverse power flow when the power storage system 10 and the photovoltaic power generation system 9 are disconnected from the grid 1 for the subsequent charging mode. When the charging mode start time 101 is reached, the power storage system 10 and the photovoltaic power generation system 9 are disconnected from the grid 1, so that the power sales power is zero. Then, when the charging mode end time 102 is reached, the solar power generation system is connected to the grid 1, so that the electric power sold corresponds to the solar power generation power. When the discharge mode start time 103 is reached, as described above, the power storage control system enters the discharge mode, and the power stored in the power storage system 10 is discharged, so that the power sold is increased.

  FIG. 8C shows the relationship between storage battery charge / discharge power and time. When the discharge mode end time 104 is reached, the power storage control system is in the power selling mode and the power storage system is stopped, so the storage battery charge / discharge power is zero. When the charging mode preliminary operation start time 107 is reached, as described above, the power storage system starts charging in the grid operation, so that the charging power increases and increases to a value equal to the photovoltaic power generation power. At this time, the electric power sold becomes zero. When the charging mode start time 101 is reached, the power storage system 10 is disconnected from the grid 1 and enters the charging mode, and the photovoltaic power is charged by the power storage system 10. When the charging mode end time 102 is reached, the power storage control system enters the power selling mode, the power storage system stops, and the storage battery charge / discharge power becomes zero. When the discharge mode start time 103 is reached, the power storage control system enters the discharge mode, and the power stored in the power storage system 10 is discharged, so the discharge power increases.

  As mentioned above, the present Example demonstrated the system configuration and control which implement | achieve system stabilization by introduction of a photovoltaic power generation system, and the time slot | zone setting of electric power sale. According to the present embodiment, it is possible to completely prevent the reverse power flow due to the fluctuation of the photovoltaic power generation while the solar power generation system and the power storage system are separated from the system because they are disconnected. Therefore, it is possible to introduce a photovoltaic power generation system even in an area where the power supply / demand balance is strictly maintained and the time zone in which power can be sold is limited.

  In addition, by controlling the power flowing backward to the grid by charging to zero, it is possible to suppress a sudden fluctuation in the reverse power flow at the time of disconnection. Thereby, the influence on the system | strain by a line-separation can be prevented.

  Moreover, the photovoltaic power generation is stopped only at the time of operation switching, and the electric power can be effectively utilized by charging the photovoltaic battery with the photovoltaic power generation during the control of the fluctuation control of the reverse power flow.

  In addition, compared to conventional systems, when solar power is effectively used without being discarded, it is possible to construct a system with almost the same amount of installed battery capacity as the amount of power generated per day for power generation facilities when power cannot be sold. Become. Thereby, space saving and cost reduction are possible.

  Compared to the conventional system, the two solar power generation systems and the power storage system are not operated alternately. Instead, the two systems are separated from the grid at the same time. Control becomes possible.

  In the description of the above embodiment, the solar power generation system in clear weather has been described as an example, but in the rainy weather, the solar power generation system does not generate power, and therefore does not charge, depending on the SOC of the current power storage system. Discharge.

  In the description of the above embodiment, the solar power generation system has been described as an example. However, other renewable energy power generation systems may be used. For example, there are solar thermal power generation, ocean power generation, wind power generation and the like. Therefore, the solar power generation in the above embodiment may be read as renewable energy power generation, and the solar panel may be read as a renewable energy power generation device. For example, the solar power generation system may be a renewable energy power generation system.

  As described above, the present embodiment is a power storage control system, and includes a renewable energy power converter, a power storage power converter, a renewable energy power converter, and a power storage converter. And a control device that controls the disconnection device, the renewable energy power conversion device, and the storage power conversion device. The control device disconnected the disconnection device. Regenerative energy power generation in a state where the power generated by the renewable energy power generation device is charged to the storage battery connected to the power storage power storage device via the power conversion device for renewable energy and the disconnection device is connected The power from the device or the power from the storage battery is configured to be supplied to the power system via the power converter for renewable energy or the power converter for power storage.

  Further, in the power storage control system, the control device is connected to the power storage power conversion device via the power conversion device for renewable energy, with the generated power from the renewable energy power generation device connected to the disconnection device. Charge the storage battery, gradually increase the charging power for charging to make the generated power and charging power approximately the same, and reduce the selling power supplied to the power system to almost zero, and then switch the disconnecting device to the disconnected state. Configure as follows.

  Further, in the power storage control system, when the switching device switches from a connected state to a disconnected state, or when switching from a disconnected state to a connected state, the control device is used for renewable energy. The power converter and the power storage power converter are configured to be temporarily stopped and switched in a stopped state.

  Further, the operation control method is used in a power storage control system including a renewable energy power generation system, a power storage system, and a disconnection device that connects or disconnects the renewable energy power generation system and the power storage system to a power system. When the disconnecting device is disconnected, the power generation system is charged with the generated power generated by the renewable energy power generation system. When the disconnecting device is connected, the power from the renewable energy power generation system or the storage system The power from is supplied to the power system.

  Also, in the operation control method, with the disconnection device linked, the generated power generated by the renewable energy power generation system is charged to the power storage system, and the charging power for charging is gradually increased so that the generated power and the charged power are substantially the same. Then, after the power selling power supplied to the power system is reduced to almost zero, the disconnecting device is switched to the disconnected state.

  Further, in the operation control method, when the disconnecting device is switched from the connected state to the disconnected state, or when the disconnected device is switched from the disconnected state to the connected state, the renewable energy power generation system and the storage system Is temporarily stopped and switched in the stopped state.

  As a result, it is possible to provide a power storage control system using renewable energy that realizes system stabilization at a low cost and an operation control method thereof. In addition, system stabilization can be realized by setting the time zone for selling power.

  Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the solar power generation power conversion device 5 and the power storage power conversion device 7 may be integrated, or may serve both for solar power generation and power storage. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

1: power system, 2: transformer, 3: disconnection device, 4: solar power generation panel, 5: power conversion device for solar power generation, 6: storage battery, 7: power conversion device for power storage, 8: control device, 9: Solar power generation system, 10: Power storage system, 20: Power storage control system, 101: Charge mode start time, 102: Charge mode end time, 103: Discharge mode start time, 104: Discharge mode end time, 106: Discharge power 107: Charging mode preliminary operation start time

Claims (7)

A power converter for renewable energy,
A power conversion device for electricity storage;
A disconnection device for connecting or disconnecting the renewable energy power conversion device and the storage power conversion device to a power system;
A control device that controls the disconnection device, the renewable energy power conversion device, and the storage power conversion device;
The control device charges the storage battery connected to the power storage power storage device via the renewable energy power conversion device with the power generated by the renewable energy power generation device in a state where the disconnection device is disconnected. The power from the renewable energy power generation device or the power from the storage battery is connected to the power system via the power conversion device for renewable energy or the power conversion device for power storage while the disconnection device is connected. supplied,
The control device is connected to the storage battery connected to the storage power converter through the renewable energy power converter with the power generated from the renewable energy generator connected to the disconnection device. After charging, gradually increasing the charging power of the charging so that the generated power and the charging power are substantially the same, and the selling power supplied to the power system is substantially zero, and then the disconnecting device is disconnected. A power storage control system characterized by switching . The power storage control system according to claim 1,
When the control device switches the disconnecting device from the connected state to the disconnected state, or when switching from the disconnected state to the connected state, the renewable energy power conversion device and A power storage control system characterized in that the power conversion device for power storage is temporarily stopped and switched in a stopped state . The power storage control system according to claim 1,
The renewable energy power generation device is a solar power generation panel, and the renewable energy power conversion device is a solar power generation power conversion device . The power storage control system according to claim 1 ,
The power storage control system further comprising a storage battery connected to the power storage device for power storage. The power storage control system according to claim 1 ,
The power storage control system, wherein the renewable energy power converter and the power storage power converter are integrated . An operation control method used in a power storage control system having a renewable energy power generation system, a power storage system, and a disconnection device that connects or disconnects the renewable energy power generation system and the power storage system to a power system,
When the disconnecting device is disconnected, the power storage system is charged with the generated power generated by the renewable energy power generation system, and when the disconnecting device is connected, the power from the renewable energy power generation system is charged. Alternatively, supply power from the power storage system to the power system.
In a state where the disconnecting device is connected, the power generation system generates power generated by the renewable energy power generation system, charges the power storage system, and gradually increases the charging power for the charging so that the generated power and the charging power are substantially the same. The operation control method is characterized in that after the selling power supplied to the electric power system is made substantially zero, the disconnecting device is switched to a disconnected state . The operation control method according to claim 6,
When switching the disconnected device from a connected state to a disconnected state, or when switching from a disconnected state to a connected state, the renewable energy power generation system and the power storage system are temporarily An operation control method characterized by stopping and switching in a stopped state .

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