JP2013247843A - Electric power system, control device, and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contribute to the realization of power selling using a hybrid type electric power conversion device.SOLUTION: An electric power system includes: a hybrid PCS 100 capable of converting DC power output from each of a PV10 and a BT20 into AC power and outputting the converted power to a load 30; and a control unit 120 for controlling a discharge of the BT20 on the basis of a power value of generated power to be output from the PV10 to the hybrid PCS 100 and a power value of reverse flow power to be output from the hybrid PCS 100 to a system 1 so that the power value of the reverse flow power will not exceed the power value of the generated output.

Description

  The present invention relates to a power system, a control device, and a control method that use a hybrid power conversion device.

  For customers who have renewable energy power generation devices, especially solar power generation devices, power conversion devices (system interconnection devices) that can convert the DC power output by the solar power generation devices into alternating current and output them to the grid and load Is provided. The output of power by such a power conversion device to the system is called reverse power flow (that is, power sale).

  In addition, a consumer having a solar power generation device may be provided with a power storage device that can store inexpensive late-night power from the grid and surplus power of the solar power generation device and output the stored power to a load.

  Since the power storage device requires a power conversion device like the solar power generation device, when the solar power generation device and the power storage device are used in combination, two power conversion devices for the solar power generation device and the power storage device are provided. It will be.

  On the other hand, a hybrid power conversion device that can be shared by a solar power generation device and a power storage device has been developed (see, for example, Patent Document 1). The hybrid power conversion device is lower in cost than the case where two power conversion devices are provided, and can store the power output from the solar power generation device in the power storage device as a direct current.

JP 2011-120323 A

  However, in Japan, although the power output from the photovoltaic power generation apparatus is a target for purchase by an electric power company, the power output from the power storage apparatus is not a target for purchase.

  Here, since the hybrid type power conversion device outputs the power output from each of the photovoltaic power generation device and the power storage device in a mixed state, the output from the power storage device that is not a target for purchase is included. The power output from the power converter is not subject to purchase.

  Therefore, there is a possibility that the hybrid type power conversion device may not be widely used for the reason that power selling cannot be realized despite various merits.

  Then, an object of this invention is to provide the electric power system, control apparatus, and control method which can contribute to realization of the power sale by a hybrid type power converter device.

  In order to solve the above-described problems, the present invention has the following features.

  The power system of the present invention includes a power conversion device capable of systematically connecting a renewable energy power generation device and a power storage device, converting DC power output from each into AC and outputting the converted power to a load. And the reverse power flow based on the power value of the generated power output from the renewable energy power generation device to the power conversion device and the power value of the reverse power flow output from the power conversion device to the grid. It has a control part which controls discharge of the above-mentioned electric storage device so that the electric power value may not exceed the electric power value of the generated electric power.

  The control unit is configured so that the power value of the reverse flow power is equal to a value obtained by reducing the power value of the generated power by an offset corresponding to a DC-AC conversion loss of the power converter. The discharge may be controlled.

  The power system may further include a measuring device for obtaining a power value of the generated power, and the power conversion device may include a connection unit for externally connecting the measuring device to the power conversion device.

  The power system of the present invention includes a power conversion device capable of systematically connecting a renewable energy power generation device and a power storage device, converting DC power output from each into AC and outputting the converted power to a load. The integrated value of the charged power charged in the power storage device among the generated power output from the renewable energy power generation device, and the reverse power flow power output to the grid out of the discharged power output from the power storage device And a control unit that controls discharging of the power storage device so that the integrated value of the reverse flow power does not exceed the integrated value of the charging power.

  The power system further includes at least one measuring device for obtaining an integrated value of the charging power and an integrated value of the reverse flow power, and the power conversion device externally connects the measuring device to the power conversion device. It may also include at least one connection for

  The control device of the present invention controls the power conversion device capable of systematically connecting the renewable energy power generation device and the power storage device, converting the DC power output by each to AC, and outputting the converted power to the load. A power value of the generated power output from the renewable energy power generation device to the power conversion device and a power value of reverse power flow output from the power conversion device to the grid. It has a control part which controls discharge of the power storage device so that the power value of tidal power does not exceed the power value of the generated power.

  The control device of the present invention controls the power conversion device capable of systematically connecting the renewable energy power generation device and the power storage device, converting the DC power output by each to AC, and outputting the converted power to the load. An integrated value of charging power charged in the power storage device among the generated power output from the renewable energy power generation device, and a reverse power flow output to the system from discharge power output from the power storage device And a controller that controls discharge of the power storage device so that the integrated value of the reverse flow power does not exceed the integrated value of the charging power based on the integrated value of the electric power.

  The control method of the present invention is a power system including a power conversion device capable of systematically connecting a renewable energy power generation device and a power storage device, converting DC power output from each to AC and outputting the converted power to a load. A control method for controlling the power storage device, the power value of the generated power output from the renewable energy power generation device to the power conversion device, and the reverse flow power output from the power conversion device to the grid And the discharge value of the power storage device is controlled so that the power value of the reverse power flow does not exceed the power value of the generated power.

  The control method of the present invention is a power system including a power conversion device capable of systematically connecting a renewable energy power generation device and a power storage device, converting DC power output from each to AC and outputting the converted power to a load. In the control method for controlling the power storage device, the integrated value of the charging power charged in the power storage device out of the generated power output from the renewable energy power generation device and the discharge output from the power storage device Controlling the discharge of the power storage device based on the integrated value of the reverse flow power output to the grid of the electric power so that the integrated value of the reverse flow power does not exceed the integrated value of the charging power. It is characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the electric power system, control apparatus, and control method which can contribute to realization of the power sale by a hybrid type power converter device can be provided.

It is a block diagram of the electric power system which concerns on 1st Embodiment and 2nd Embodiment. It is a block diagram of hybrid PCS concerning a 1st embodiment. It is a control flow figure by the control part concerning a 1st embodiment. It is a figure for demonstrating the direct current- alternating current conversion efficiency of hybrid PCS. It is a block diagram of hybrid PCS concerning the example 3 of a change of a 1st embodiment. It is a block diagram of hybrid PCS concerning a 2nd embodiment. It is a control flow figure by the control part concerning a 2nd embodiment. It is a block diagram of hybrid PCS which concerns on the example of a change of 2nd Embodiment.

  A first embodiment, a second embodiment, and other embodiments of the present invention will be described with reference to the drawings. In the drawings according to the following embodiments, the same or similar parts are denoted by the same or similar reference numerals.

(First embodiment)
FIG. 1 is a block diagram of a power system according to the present embodiment.

  As shown in FIG. 1, the power system according to the present embodiment includes a grid 1 and a house H as a consumer who receives power supply from the grid 1. The grid 1 is managed by an electric power company and supplies AC power to the house H.

  The house H includes a system power line L that transmits power to and from the system 1, and a smart meter 2 and a distribution board 3 provided on the system power line L.

  The smart meter 2 is connected to the external network NW1. The smart meter 2 measures the power consumption of the house H (that is, the purchased power from the grid 1) and the reverse power flow (that is, the power sold to the grid 1).

  The smart meter 2 can transmit information about the measured power via a network (external network NW1 and home network NW2). The smart meter 2 can also receive information regarding power control via the external network NW1.

  The distribution board 3 distributes the power input via the system power line L to the plurality of loads 30. The load 30 is not limited to a plurality of cases and may be one. The load 30 operates by consuming electric power input via the system power line L. The load 30 is a home electric appliance (for example, a refrigerator, an air conditioner, lighting, or the like) provided in the house H.

  The house H includes a solar power generation device (hereinafter “PV”) 10, a power storage device (hereinafter “BT”) 20, and a hybrid PCS (Power Conditioning System) 100. In this embodiment, the hybrid PCS 100 corresponds to a power conversion device for systematic connection of the PV 10 and the BT 20. In this embodiment, PV10 corresponds to a renewable energy power generation device.

  The PV 10 is connected to the hybrid PCS 100 via a PV output power line. The PV 10 receives sunlight, which is renewable energy, and generates power, and outputs direct-current power (hereinafter referred to as “PV generated power”) obtained by the power generation to the hybrid PCS 100. The PV generated power is subject to power sale (ie, purchase by an electric power company).

  The BT 20 is connected to the hybrid PCS 100 via the BT input / output power line. For example, the BT 20 may be a lithium ion battery or a lead storage battery. The BT 20 is charged with DC power supplied from the hybrid PCS 100. The BT 20 discharges and outputs DC power obtained by the discharge (hereinafter, “BT discharge power”) to the hybrid PCS 100. At present, in Japan, BT discharge power is not subject to purchase, unlike PV generated power.

  Hybrid PCS 100 is connected to system power line L. Hybrid PCS 100 converts the purchased power from system 1 into direct current, outputs the converted power to BT 20, and charges BT 20. Further, the hybrid PCS 100 can charge the BT 20 by outputting the PV generated power from the PV 10 to the BT 20 in a direct current state.

  The hybrid PCS 100 converts each of the PV generated power and the BT discharge power into alternating current, and outputs the converted power to the system power line L. As a result, the electric power from the hybrid PCS 100 is output to the grid 1 and the load 30 via the grid power line L.

  Since the hybrid PCS 100 outputs the PV generated power and the BT discharge power in a mixed state, at present, the power output by the hybrid PCS 100 cannot be sold in Japan.

  In this embodiment, the hybrid PCS 100 monitors the PV generated power and the power that is reversely flowed (sold) from the hybrid PCS 100 to the grid 1 (hereinafter “reverse flow power”), and the power value of the reverse flow power. Controls the discharge of the BT 20 so as not to exceed the power value of the PV generated power.

  As a result, only the power corresponding to the PV generated power can be allowed to reverse flow, and the reverse power flow corresponding to the BT discharge power can be prohibited, so that the constraint that the PV generated power is subject to purchase can be satisfied. . Therefore, it can contribute to the realization of power selling by the hybrid PCS 100.

  Each of the smart meter 2, the load 30, and the hybrid PCS 100 is connected to the home network NW2. The home network NW2 may be a wireless network such as Zigbee (registered trademark) or a wired network such as Ethernet (registered trademark). Furthermore, at least a part of the home network NW2 may be shared with the system power line L by power line communication (PLC).

  The HEMS 200 is connected to the home network NW2. The HEMS 200 manages power consumption in the house H, and can communicate with each device connected to the home network NW2 to control the device. The HEMS 200 may communicate with the external network NW1 via the smart meter 2 or not via the smart meter 2.

  Next, the configuration of the hybrid PCS 100 according to the present embodiment will be described. FIG. 2 is a block diagram of the hybrid PCS 100 according to the present embodiment.

  As shown in FIG. 2, the hybrid PCS 100 includes a bidirectional converter 110 and a control unit 120.

  Bidirectional converter 110 converts PV generated power and BT discharge power into alternating current, and outputs the converted power to system power line L. Bidirectional converter 110 can also convert AC power from system power line L to DC and output the converted power to BT 20.

  In the present embodiment, the control unit 120 is connected to a wattmeter (measuring instrument) 51 provided on the system power line L and a wattmeter (measuring instrument) 52 provided on the output power line of the PV 10. The The connection between the control unit 120 and the power meter 51 is not limited to a connection via a dedicated line, but may be a connection via a home network NW2. Further, the smart meter 2 shown in FIG. 1 may be used as the wattmeter 51.

  The wattmeter 51 is provided on the grid 1 side from the junction P1 between the grid power line L and the input / output power line of the hybrid PCS 100. The wattmeter 51 measures the power value of the reverse power flow and outputs the measurement result to the control unit 120.

  The wattmeter 52 is provided on the output power line of the PV 10 inside the hybrid PCS 100. However, the wattmeter 52 may be provided on the output power line of the PV 10 outside the hybrid PCS 100. The wattmeter 52 measures the power value of the PV generated power and outputs the measurement result to the control unit 120.

  The control unit 120 controls the BT 20 based on the outputs of the wattmeter 51 and the wattmeter 52. The connection between the control unit 120 and the BT 20 is not limited to a connection via a dedicated line, but may be a connection via a home network NW2.

  Based on the power value of the reverse power flow obtained by the power meter 51 and the power value of the PV generated power obtained by the power meter 52, the control unit 120 converts the power value of the reverse power flow into the power value of the generated power. The discharge of the BT 20 is controlled so as not to exceed. In the present embodiment, the control unit 120 corresponds to a control device that controls the BT 20.

  Next, details of control by the control unit 120 according to the present embodiment will be described. FIG. 3 is a control flow diagram by the control unit 120 according to the present embodiment.

  As shown in FIG. 3, in step S <b> 11, the control unit 120 sets an allowable value of reverse flow power from the power value of the PV generated power obtained by the wattmeter 52. In the present embodiment, the control unit 120 sets the power value of the PV generated power as the allowable reverse power flow value.

  In step S12, the control unit 120 controls the discharge of the BT 20 so that the power value of the reverse flow power obtained by the wattmeter 51 is equal to or less than the allowable reverse flow power value set in step S11. In other words, control is performed so that the discharge of the BT 20 does not exceed the consumption at the load 30 so that the power value of the reverse flow power obtained by the power meter 51 does not exceed the allowable reverse flow power value set in step S11. It becomes.

  As described above, the control unit 120 controls the discharge of the BT 20 so that the power value of the reverse flow power does not exceed the power value of the PV generated power. As a result, an operating environment in which reverse power flow is allowed only for the power corresponding to the PV generated power (that is, the power corresponding to the BT discharge power is not reverse flowed) is constructed. Therefore, since it is possible to satisfy the restriction that the PV generated power is a purchase target, it is possible to contribute to the realization of power selling by the hybrid PCS 100.

(Modification 1 of the first embodiment)
Conversion loss occurs when converting PV generated power into alternating current. In consideration of such conversion loss, the first embodiment described above can be modified as follows.

  Assuming a PCS dedicated to PV10, it is possible to reverse power flow with less conversion loss than PV generated power. For this reason, as in the first embodiment described above, if the reverse power flow to the grid 1 is allowed with the power value of the PV generated power as the upper limit, a large amount of power can be reverse flow compared to the PCS dedicated to PV10. Therefore, fairness with the PCS dedicated to PV10 cannot be secured.

  Therefore, in the present modification example, the control unit 120 sets a value (fixed value) obtained by reducing the power value of the PV generated power by an offset corresponding to the conversion loss as a reverse flow allowable power value. That is, in the present modification example, the reverse flow allowable power value is set as follows.

Allowable reverse power flow value = PV power generation power value−offset value Here, the offset value can be an average DC / AC conversion loss value of the hybrid PCS 100 (bidirectional converter 110).

  Therefore, according to this modified example, an operating environment similar to that of the PC 10 dedicated to PV 10 can be constructed, which can contribute to the realization of power sale by the hybrid PCS 100.

(Modification 2 of the first embodiment)
In the first modification of the first embodiment, the offset value is fixed, but in this modification, the offset value is variable.

  As shown in FIG. 4, when the power value of the DC input power is small, the hybrid PCS 100 has poor conversion efficiency to AC. Further, the conversion efficiency of the hybrid PCS 100 does not increase linearly with an increase in the power value of the DC input power.

  Therefore, in the present modification, the control unit 120 derives the DC / AC conversion loss value from the power value of the PV generated power based on the conversion efficiency shown in FIG. 4, and uses the derived DC / AC conversion loss value. The offset value. The derivation here is not limited to the case of using a table in which the power value of the PV generated power is associated with the value of the DC / AC conversion loss, but the value of the DC-AC conversion loss is calculated from the power value of the PV generated power. A calculation formula may be used.

  Therefore, according to this modification example, the offset value can be set to an appropriate value in accordance with the change in the power value of the PV generated power by dynamically changing the offset value based on the power value of the PV generated power.

(Modification 3 of the first embodiment)
In the first embodiment described above, the wattmeter 52 is provided inside the hybrid PCS 100. In this case, it is difficult to confirm the PV generated power (or its integrated value) from the outside of the hybrid PCS 100. On the other hand, when the power sale by the hybrid PCS 100 is possible, it is assumed that not only the smart meter 2 but also the wattmeter 52 is a target of meter reading by an electric power company or the like.

  Therefore, in this modification, the hybrid PCS 100 is configured so that the wattmeter 52 can be externally connected (external connection). FIG. 5 is a block diagram of the hybrid PCS 100 according to this modification. As shown in FIG. 5, the hybrid PCS 100 according to this modification includes a connection unit 101 for externally connecting the power meter 52 to the hybrid PCS 100. The wattmeter 52 is connected to the connection unit 101. Connection unit 101 includes an interface for outputting the measurement value of power meter 52 to control unit 120.

  Therefore, according to this modification, it is possible to provide the hybrid PCS 100 in which the wattmeter 52 can be externally attached (external connection).

(Second Embodiment)
Hereinafter, the difference between the second embodiment and the first embodiment will be mainly described.
In the first embodiment described above, it is assumed that only PV generated power is a target for purchase. However, in this embodiment, not only PV generated power but also BT discharge corresponding to PV generated power charged by BT 20 is used. Assume that power is also subject to purchase.

  FIG. 6 is a block diagram of the hybrid PCS 100 according to the present embodiment.

  As shown in FIG. 6, the hybrid PCS 100 according to the present embodiment is different from the first embodiment in that it further includes a power meter (measuring instrument) 53, but the other configurations are the same as those in the first embodiment.

  The wattmeter 53 is provided on the power line between the junction point P2 between the output power line of the PV 10 and the input / output power line of the BT 20 and the bidirectional converter 110 in the hybrid PCS 100. The wattmeter 53 measures the total power value of the PV generated power and the BT discharge power (hereinafter, “PV / BT total output power value”) and outputs the measurement result to the control unit 120.

  The control unit 120 controls the BT 20 based on the outputs of the wattmeter 51, the wattmeter 52, and the wattmeter 53.

  In the present embodiment, the control unit 120 includes the integrated value of the power charged in the BT 20 in the PV generated power (hereinafter, “charged power from the PV 10”) and the reverse power flow output to the system 1 in the BT discharge power. Based on the integrated value of power (hereinafter referred to as “reverse power flow from BT20”), discharge of BT20 is performed so that the integrated value of reverse power flow from BT does not exceed the integrated value of charge power from PV. Control. In the present embodiment, the control unit 120 corresponds to a control device that controls the BT 20.

  Next, details of control by the control unit 120 according to the present embodiment will be described. FIG. 7 is a control flow diagram by the control unit 120 according to the present embodiment.

  As shown in FIG. 7, in step S <b> 21, the control unit 120 obtains and accumulates the power value of the charging power from the PV 10, obtains and accumulates the power value of the reverse power flow from the BT 20, and each accumulated value. Remember.

  Here, the reverse power flow from the BT 20 can be obtained as follows. First, the control unit 120 calculates a reverse power flow allowable power value from the power value of the PV generated power obtained by the wattmeter 52 in the same manner as in the first embodiment or the modification thereof. Secondly, the control unit 120 sets the value obtained by subtracting the allowable reverse flow power value from the reverse flow power value obtained by the wattmeter 51 as the reverse flow power value from the BT 20. However, since the power value of the reverse power flow from the BT 20 here is an AC power value, it is converted to a DC power value by adding the above-described offset value to the power value.

  Moreover, about the electric power value of the charging power from PV10, it can obtain | require as follows. The controller 120 subtracts the PV / BT total output power value obtained by the power meter 53 from the power value of the PV generated power obtained by the power meter 52 when the BT 20 is charging. , And the power value of the charging power from PV10.

  In step S22, the control unit 120 controls the discharge of the BT 20 so that the integrated value of the reverse flow power from the BT is equal to or less than the integrated value of the charging power from the PV. In other words, the discharging of the BT 20 is controlled so that the integrated value of the reverse flow power from the BT does not exceed the integrated value of the charging power from the PV.

  As described above, the control unit 120 controls the discharge of the BT 20 so that the integrated value of the reverse flow power from the BT does not exceed the integrated value of the charging power from the PV. As a result, an operating environment in which reverse power flow is allowed only for power corresponding to PV generated power (including PV generated power charged in BT 20) is constructed. Therefore, since it is possible to satisfy the restriction that the PV generated power is a purchase target, it is possible to contribute to the realization of power selling by the hybrid PCS 100.

(Modification of the second embodiment)
In the second embodiment described above, the wattmeter 52 and the wattmeter 53 are provided inside the hybrid PCS 100. In this case, it is difficult to confirm the PV generated power (or its integrated value) and the PV / BT total output power value (or its integrated value) from the outside of the hybrid PCS 100. On the other hand, when the hybrid PCS 100 can sell power, it is assumed that not only the smart meter 2 but also the power meter 52 and the power meter 53 are subject to meter reading by an electric power company or the like.

  Therefore, in this modified example, the hybrid PCS 100 is configured so that the wattmeter 52 and the wattmeter 53 can be externally attached (externally connected). FIG. 8 is a block diagram of the hybrid PCS 100 according to this modification. As shown in FIG. 8, the hybrid PCS 100 according to this modification includes a connection unit 102 for externally connecting the power meter 53 to the hybrid PCS 100 in addition to the connection unit 101 for externally connecting the power meter 52 to the hybrid PCS 100. Have The wattmeter 53 is connected to the connection unit 102. Connection unit 102 includes an interface for outputting the measurement value of power meter 53 to control unit 120.

  Therefore, according to this modification, it is possible to provide the hybrid PCS 100 in which the wattmeter 52 and the wattmeter 53 can be externally attached (external connection).

(Other embodiments)
The descriptions and drawings forming part of this disclosure should not be construed as limiting the invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, each of the wattmeter 51, the wattmeter 52, and the wattmeter 53 may be configured by a combination of an ammeter and a voltmeter. In this case, the control unit 120 can calculate power based on the current value output from the ammeter and the voltage value output from the voltmeter.

  In the embodiment described above, an example in which the control unit 120 provided in the hybrid PCS 100 directly controls the BT 20 has been described, but the control unit 120 may indirectly control the BT 20 via the HEMS 200. For example, the control unit 120 transmits a control command for the BT 20 to the HEMS 200, and the HEMS 200 controls the BT 20 according to the received control command.

  Or you may control BT20 led by HEMS200 instead of controlling BT20 led by control part 120 provided in hybrid PCS100. In detail, HEMS200 acquires each measured value of wattmeter 51 and wattmeter 52 (and wattmeter 53), and performs control flow concerning a 1st embodiment or a 2nd embodiment based on the acquired measured value. Run. In this case, the HEMS 200 corresponds to a control device that controls the BT 20.

  Moreover, in embodiment mentioned above, although the house H as a consumer was illustrated and HEMS200 which performs electric power management by the house H unit was illustrated, BEMS intended for buildings, FEMS intended for factories, or a store are targeted SEMS or the like may be used.

  H ... Housing, L ... Grid power line, NW1 ... External network, NW2 ... In-home network, 1 ... Grid, 2 ... Smart meter, 3 ... Distribution board, 10 ... PV, 20 ... BT, 30 ... Load, 51, 52 53 ... Power meter, 100 ... Hybrid PCS, 101,102 ... Connector, 110 ... Bidirectional converter, 120 ... Control unit, 200 ... HEMS

Claims (9)

A power system including a power conversion device capable of systematically connecting a renewable energy power generation device and a power storage device, converting DC power output from each into AC, and outputting the converted power to a load,
Based on the power value of the generated power output from the renewable energy power generator to the power converter and the power value of the reverse power output from the power converter to the grid, the power value of the reverse power flow A power system comprising: a control unit that controls discharge of the power storage device so that the power value of the generated power does not exceed the power value.   The control unit is configured so that the power value of the reverse flow power is equal to a value obtained by reducing the power value of the generated power by an offset corresponding to a DC / AC conversion loss of the power converter. The electric power system according to claim 1, wherein discharge is controlled. A measuring instrument for obtaining a power value of the generated power;
The power system according to claim 1, wherein the power conversion device includes a connection unit for externally connecting the measuring instrument to the power conversion device. A power system including a power conversion device capable of systematically connecting a renewable energy power generation device and a power storage device, converting DC power output from each into AC, and outputting the converted power to a load,
Of the generated power output from the renewable energy power generation device, the integrated value of the charging power charged in the power storage device, and the integrated value of the reverse power flow output to the grid out of the discharged power output from the power storage device; And a control unit that controls discharge of the power storage device so that the integrated value of the reverse flow power does not exceed the integrated value of the charging power. At least one measuring instrument for obtaining the integrated value of the charging power and the integrated value of the reverse flow power;
The power system according to claim 4, wherein the power conversion device includes at least one connection unit for externally connecting the measuring instrument to the power conversion device. A control device for controlling a power conversion device capable of connecting a renewable energy power generation device and a power storage device to each other, converting DC power output from each into AC power, and outputting the converted power to a load,
Based on the power value of the generated power output from the renewable energy power generator to the power converter and the power value of the reverse power output from the power converter to the grid, the power value of the reverse power flow The control device controls discharge of the power storage device so that does not exceed a power value of the generated power. A control device for controlling a power conversion device capable of connecting a renewable energy power generation device and a power storage device to each other, converting DC power output from each into AC power, and outputting the converted power to a load,
Of the generated power output from the renewable energy power generation device, the integrated value of the charging power charged in the power storage device, and the integrated value of the reverse power flow output to the grid out of the discharged power output from the power storage device; The control device controls discharge of the power storage device so that the integrated value of the reverse flow power does not exceed the integrated value of the charging power, based on. In a power system including a power conversion device capable of systematically connecting a renewable energy power generation device and a power storage device, converting DC power output from each into AC and outputting the converted power to a load, the power storage device is controlled A control method for
Based on the power value of the generated power output from the renewable energy power generator to the power converter and the power value of the reverse power output from the power converter to the grid, the power value of the reverse power flow Controlling the discharge of the power storage device so that does not exceed the power value of the generated power. In a power system including a power conversion device capable of systematically connecting a renewable energy power generation device and a power storage device, converting DC power output from each into AC and outputting the converted power to a load, the power storage device is controlled A control method for
Of the generated power output from the renewable energy power generation device, the integrated value of the charging power charged in the power storage device, and the integrated value of the reverse power flow output to the grid out of the discharged power output from the power storage device; The control method is characterized in that the discharge of the power storage device is controlled so that the integrated value of the reverse flow power does not exceed the integrated value of the charging power based on the above.

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