JP5903661B2 - Grid interconnection device - Google Patents

Grid interconnection device Download PDF

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Publication number
JP5903661B2
JP5903661B2 JP2012116100A JP2012116100A JP5903661B2 JP 5903661 B2 JP5903661 B2 JP 5903661B2 JP 2012116100 A JP2012116100 A JP 2012116100A JP 2012116100 A JP2012116100 A JP 2012116100A JP 5903661 B2 JP5903661 B2 JP 5903661B2
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power
circuit
dc power
dc
power system
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JP2013243870A (en
Inventor
俊介 飯田
俊介 飯田
前田 崇
崇 前田
剛史 関根
剛史 関根
晋平 菊池
晋平 菊池
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パナソニックIpマネジメント株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/10Photovoltaic [PV]
    • Y02B10/14PV hubs
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/20Sector-wide applications using renewable energy
    • Y02P80/23Solar energy

Description

The present invention relates to a grid interconnection device that converts DC power obtained from renewable energy into AC power and supplies the AC power to a power system.

A small-scale power system called a microgrid has been studied as a power supply system that can easily introduce a power generation device using renewable energy. In microgrids, power generation systems such as solar power generation systems and wind power generation systems and consumers who consume electricity (factories, schools, houses, stores, etc.) are connected in a closed distribution system separate from the commercial power system. Has been.
This power generation system includes a high-output power generation system exceeding megawatts, and a low-output power generation system of several kilograms to several tens of kilowatts as provided in consumers. The power generation system in the microgrid generates power so that the demand and supply of power are balanced with consumers.

In such a microgrid, when the use of power generation devices that use renewable energy advances, the charge for using power (power purchase fee, power sale fee) in the microgrid may become more advantageous than the commercial power system. is expected.

On the other hand, a grid interconnection device that converts DC power obtained from renewable energy (for example, sunlight, wind power, hydraulic power, etc.) to AC power synchronized with a commercial power system has been proposed. A normal grid interconnection device is connected to a commercial power system, and superimposes the converted AC power on the commercial power system and then supplies it to the load. In recent years, a grid interconnection device has been proposed in which DC power or AC power obtained from various energy sources is input and the power is collectively superimposed on a commercial power system (
Patent Document 1).

JP 2011-250605 A

The grid interconnection device is also used for a power generation system of a microgrid. In this case, the grid interconnection device is connected to the microgrid instead of the commercial power grid. Thereby, the consumer can use the power of the microgrid or supply the generated power to the microgrid.

However, in the microgrid, the power generation system must generate power so that the demand and supply of power are balanced with the consumer. For this reason, in an electric power system such as a microgrid, the supply of electric power to consumers may be unstable (it is more unstable than a commercial electric power system). In addition, when a grid interconnection device is connected to a commercial power system, it is not possible to enjoy the advantages of a power system such as a microgrid (for example, electricity charges).

The present invention has been made in view of the above-described problems, and provides a grid interconnection device that can utilize an electric power system that is advantageous to the consumer while the supply of electric power to the consumer is stable. The purpose is to do.

In order to achieve the above object, an inverter that converts DC power obtained from renewable energy into AC power synchronized with the first power system, supplies the AC power to the first power system, and then supplies it to the load. In a grid interconnection device provided with a circuit, the power connected to the second power system is converted to the DC power so that the power obtained from the second power system can be merged and supplied to the inverter circuit. An input / output circuit is provided that converts at least a part of the power into AC power synchronized with the second power system and can superimpose the AC power on the second power system.

According to the grid interconnection device of the present invention, even if the second power system (for example, a microgrid or the like) becomes unstable, the power of the first power system (for example, the commercial power system) is used. Therefore, it is possible to use a power system that is advantageous to the consumer while the supply of power to the consumer is stable.

In the above-mentioned invention, the input / output circuit includes a bidirectional conversion circuit that connects the DC power and the second power system, and the power consumption of the load is more than the DC power obtained from the renewable energy. When large, when the DC power obtained by rectifying the AC power of the second power system or the like by the bidirectional conversion circuit is output to the inverter circuit, the power consumption of the load is smaller than the DC power obtained from the renewable energy The DC power is superimposed on the second power system by the bidirectional conversion circuit.

In the above-described invention, the inverter circuit includes a DC booster circuit at a preceding stage and has a configuration for stabilizing DC power after the boosting.

In addition, another grid interconnection apparatus of the present invention uses the first DC power obtained from renewable energy.
In the grid interconnection device provided with an inverter circuit that converts the AC power to be synchronized with the power system of the first power system and supplies the AC power to the load after being superimposed on the first power system, the second power system is connected, and The power obtained from the second power system is converted into the DC power so as to be merged and supplied to the inverter circuit, and at least a part of the DC power is converted into AC power synchronized with the second power system. And an input / output circuit capable of superimposing the AC power on the second power system and a conversion circuit for supplying power from the first power system to the input / output circuit.

According to another grid interconnection device of the present invention, even if the second power system (for example, a microgrid) becomes unstable, the power of the first power system (for example, commercial power system) is used. Therefore, it is possible to use a power system that is advantageous to the consumer while the supply of power to the consumer is stable.

In the above-mentioned invention, the conversion circuit uses the inverter circuit.

ADVANTAGE OF THE INVENTION According to this invention, the grid connection apparatus which can utilize a power grid advantageous with respect to a consumer can be provided, while supply of the electric power to a consumer is stabilized.

It is a schematic diagram showing a solar power generation system. It is an electric circuit diagram which shows a grid connection apparatus. It is a figure which shows the flowchart of operation | movement of a control circuit.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a solar power generation system 10. As shown in this figure, a solar power generation system 10 having a solar cell 1 and a grid interconnection device 2 is connected to a commercial power system 3 (first power system) and a microgrid 5 (second power system). ing.

The microgrid is connected to a power generation system such as a high-output solar power generation system 51 and a wind power generation system 52 and a consumer (such as a factory 53, a school 54, a house, and a store 55) that consumes electric power. It constitutes a closed small-scale power system. The power generation system in the microgrid generates power so that the demand and supply of power are balanced with consumers. In the present embodiment, the solar power generation system 10 is attached to a consumer.

Here, in the microgrid 5, power generation devices using renewable energy have been spread, and the power usage fee (power purchase fee, power sale fee) in the microgrid 5 is more advantageous than the commercial power system. Assuming that Further, here, the microgrid 5 and the commercial power system 3 have the same frequency (for example, 50 Hz, 60 Hz) and the same voltage (single-phase three-wire 20
0V etc.) is assumed.

The solar cell 1 converts sunlight (renewable energy) into DC power and outputs it. The solar cell 1 is configured such that a plurality of solar cells are connected in series and / or in parallel to obtain desired DC power.

The grid interconnection device 2 includes a booster circuit 21 (DC booster circuit), an inverter circuit 22, an input / output circuit 23, an interconnection relay 24, and a control circuit 25. FIG. 2 is an electric circuit diagram showing the grid interconnection device 2.

The booster circuit 21 is provided upstream of the inverter circuit 22 and boosts DC power obtained from the solar cell 1. The DC power obtained from the boosted solar cell 1 is supplied to the inverter circuit 22. The booster circuit 21 includes a reactor 11, a diode 12, a switch element 13, and a capacitor 14, and constitutes a non-insulated chopper circuit.

Specifically, the reactor 11 and the diode 12 are connected in series, and the reactor side of the series circuit of the reactor 11 and the diode 12 is connected to the positive terminal of the solar cell 1. The switch element is connected to the connection point between the reactor and the diode 12 and the negative terminal of the solar cell 1. The capacitor 14 is connected to the diode side of the series circuit and the negative terminal of the solar cell. As the switch element 13, a switch element such as IGBT or FET is preferably used. The capacitor 14 is a large-capacity capacitor, and is configured such that the voltage after boosting is stabilized.

The booster circuit 21 conducts / cuts off the switch element periodically, so that the capacitor 1
The DC power of the solar cell 1 boosted from both ends of 4 is output. At this time, the switch element 13
By changing the duty ratio (conducting time / (conducting time + interrupting time)) for conducting / cutting off periodically, a desired step-up ratio can be obtained. The output DC power is supplied to the inverter circuit 22 and the input / output circuit 23.

The inverter circuit 22 converts the DC power obtained from the solar cell 1 into AC power synchronized with the commercial power system 3. The inverter circuit 22 superimposes the converted AC power on the commercial power system 3 and then supplies it to the load 4 connected to the commercial power system 3.

The inverter circuit 22 includes a bridge circuit 41 obtained by bridge-connecting four switch circuits in which switch elements and diodes are connected in antiparallel, and a filter circuit 42 connected to the AC side of the bridge circuit 41. The DC side of the bridge circuit 41 is the capacitor 14 of the booster circuit 21.
Connected to (output side). The inverter circuit 22 periodically conducts / cuts off the switch element of the bridge circuit 41 by the PWM signal generated by the control circuit 25, thereby converting the input DC power into AC power synchronized with the commercial power system, and filtering it. Output from the circuit 42.

The input / output circuit 23 is connected to the microgrid 5 and converts the electric power obtained from the microgrid 5 into a DC power obtained from the solar cell 1 so as to be able to be merged.
And at least a part of the DC power obtained from the solar cell 1 is converted to AC power synchronized with the microgrid 5, and the converted AC power can be superimposed on the microgrid 5.

Specifically, the input / output circuit 23 includes a bidirectional circuit 23a and an inverter circuit 23b, and the DC power obtained from the solar cell 1 and the microgrid 5 by the bidirectional circuit 23a and the inverter circuit 23b. A bidirectional conversion circuit to be connected is configured.

The bidirectional circuit 23a is connected between the booster circuit 21 and the inverter circuit 23b.
The DC power output from the booster circuit 22 is supplied to the inverter circuit 23b as it is. In addition, the bidirectional circuit 23 a boosts the DC power of the microgrid supplied from the inverter circuit 23 b and supplies it to the inverter circuit 22.

Specifically, the bidirectional circuit 23a includes a reactor 31, a diode 32, and a switch element 33.
, A capacitor 34, and an open / close relay 35. Reactor 31 and diode 32
Are connected in series to form a series circuit, and the reactor 31 side of this series circuit is connected to the positive terminal on the DC side of the inverter circuit 23b. The switch element 33 is connected to a connection point between the reactor 31 and the diode 32 and a negative terminal of the inverter circuit 23b. One end of the capacitor 34 is connected to the positive terminal on the DC side of the inverter circuit 23b, and the other end of the capacitor 34 is
The inverter circuit 23b is connected to the negative terminal on the DC side. The open / close relay 35
Are connected in parallel with the series circuit of the reactor 31 and the diode 32.

The inverter circuit 23b has the same configuration as that of the inverter circuit 22 including the bridge circuit 41 and the filter circuit 42.

When DC power obtained from the solar cell 1 is supplied to the microgrid 5, the bidirectional circuit 2
3a closes the open / close relay 35 and shuts off the switch circuit 33. As a result, the booster circuit 21
Is output to the inverter circuit 23b as it is, bypassing the series circuit of the reactor 31 and the diode 32. Further, in this case, the inverter circuit 23 b periodically conducts / cuts off the switch element of the bridge circuit 41 by the PWM signal generated by the control circuit 25, so that the input DC power is synchronized with the microgrid 5. And output from the filter circuit 42. In this way, the input / output circuit 23 supplies DC power obtained from the solar cell 1 to the microgrid 5.

When the power supplied from the microgrid 5 is supplied to the inverter circuit 22, the AC power of the microgrid 5 is rectified by the diode of the bridge circuit 41 of the inverter circuit 23b, and the rectified DC power is supplied to the bidirectional circuit 23a. The Further, in this case, the bidirectional circuit 23a opens the open / close relay 35 and periodically turns on / off the switch circuit 33. By operating in this manner, the bidirectional circuit 23a operates as a non-insulated chopper circuit that boosts DC power input from the inverter circuit 23b and supplies the boosted DC power to the inverter circuit 22. Similarly to the step-up circuit 21, the bidirectional circuit 23 a also changes the duty ratio (conduction time / (conduction time + cut-off time)) at which the switch element 33 is periodically turned on / off to change the desired step-up ratio. Can be obtained. In this way, the input / output circuit 23 supplies the power supplied from the microgrid 5 to the inverter circuit 22.

The interconnection relay 24 is provided between the inverter circuit 22 and the commercial power system 3 and between the inverter circuit 23 b and the microgrid 5. The interconnection relay 24 provided between the inverter circuit 22 and the commercial power system 3 is opened when there is no power exchange between the grid interconnection device 2 and the commercial power system 3, and exchanges power. If there is, it is closed. In addition, the interconnection relay 2 provided between the inverter circuit 23b and the microgrid 5
Similarly, 4 is opened when there is no power exchange between the grid interconnection device 2 and the microgrid, and is closed when there is power exchange.

The control circuit 25 can detect the voltage or current at any location detected by the voltage sensor or current sensor, and based on the detected voltage or current, the booster circuit 21, the inverter circuit 22, the input / output circuit 23, The operation of the system relay 24 is controlled.

The control circuit 25 sets the duty ratio of the booster circuit 21 to the DC power (
Control is performed so that the input power to the booster circuit 21 is maximized. Specifically, the DC power obtained from the solar cell 1 input to the booster circuit 21 is calculated from the input current and input voltage to the booster circuit 21. If the calculated DC power is greater than the previously calculated DC power, change the duty ratio to the same one that changed the previous duty ratio (lower the previous duty ratio, lower it again, increase the previous duty ratio) If you do, increase it). Conversely, if the DC power is smaller than the previously calculated DC power, change the duty ratio to the opposite of the one that changed the previous duty ratio (higher if the previous duty ratio is lower, and higher the previous duty ratio) If so, lower).

The control circuit 25 generates a PWM signal for turning on / off the switch element of the inverter circuit 22. Specifically, the control circuit 25 outputs the output current command value It of the inverter circuit 22.
To generate a PWM signal that outputs the output voltage of the inverter circuit 22 so that the output current of the inverter circuit 22 matches the output current command value It.

When the power consumption of the load 4 is greater than the DC power obtained from the solar cell 1, the control circuit 25 converts the DC power obtained by rectifying the AC power of the microgrid 5 by the input / output circuit 23 (bidirectional conversion circuit) into an inverter circuit. The input / output circuit 23 is operated so as to output to the output 22. In addition, when the power consumption of the load 4 is smaller than the DC power obtained from the solar cell 1, the control circuit 25 operates so that at least a part of this DC power is superimposed on the microgrid 5 by the input / output circuit 23.

The operation of these control circuits 25 will be described with reference to the drawings. FIG. 3 is a flowchart showing the operation of the control circuit. The control circuit 25 detects the power consumption PL of the load 4 (step S11), and detects the DC power PP obtained from the solar cell 1 (step S12). The detection of the power consumption PL of the load may be performed by calculation using the AC power output from the inverter circuit 22 and the AC power supplied from the commercial power system 3, or the power consumption PL of the load can be directly detected. Anyway. As described above, the DC power PP obtained from the solar cell 1 is
The input power of the booster circuit 21 may be detected.

Next, the control circuit 25 determines whether or not the power consumption PL is larger than the DC power PP (
Step S13). When the power consumption PL is greater than the DC power PP, as described above, the input / output circuit 23 (bidirectional conversion circuit) outputs the DC power obtained by rectifying the AC power of the microgrid 5 to the inverter circuit 22. The circuit 23 is operated (step S14), and the process returns to step S11.

Specifically, the control circuit 25 shuts off all the switches of the inverter circuit 23b, opens the open / close relay 35 of the bidirectional circuit 23a, and generates a switching signal of the switch element 33 of the bidirectional circuit 23a. As for the switching signal, the current Id output from the bidirectional circuit 31 is the target current It.
A signal having a duty ratio so as to be d is generated. The target current Itd is the bidirectional circuit 2
The voltage Vd on the output side (boost circuit side) 3a may be detected and obtained by dividing the difference between the DC power PP and the power consumption PL by the voltage Vd. By doing so, the amount of power consumed by the load 4 is supplied from the microgrid 5 to the load 4. Inverter circuit 2
The target current It of 2 is determined in consideration of the power supplied from the microgrid to the inverter circuit 22 (the target current It increases by this power).

When the power consumption PL is smaller than the DC power PP, as described above, at least a part of the DC power PP obtained from the solar cell 1 is superimposed on the microgrid 5 by the input / output circuit 23 (step S15) and the process proceeds to step S11. Return.

Specifically, the control circuit 25 closes the open / close relay 35 of the bidirectional circuit 23a, and the bidirectional circuit 23
The switch element 33 of a is cut off, and a PWM signal for conducting / cutting off the switch element of the inverter circuit 23b is generated. Specifically, the control circuit 25 calculates the output current command value Itq of the inverter circuit 23b, and the output current Iq of the inverter circuit 23b becomes the output current command value I
A PWM signal is generated so as to output the output voltage of the inverter circuit 23b so as to coincide with tq. The target current It of the inverter circuit 22 is determined in consideration of the power supplied to the microgrid among the DC power obtained from the solar cell (the target current It is reduced by this power).

As described above, according to the present embodiment, the power connected to the microgrid 5 is converted into the DC power obtained from the solar cell 1 so as to be merged with the power obtained from the microgrid and supplied to the inverter circuit 22. At least a part of this DC power
And an input / output circuit that converts the AC power to the microgrid 5 so as to be superimposable. For this reason, even if the microgrid 5 becomes unstable, the power of the commercial power system 5 can be used. An advantageous microgrid 5 can be used.

Moreover, according to this embodiment, when the power consumption of the load 4 is larger than the DC power obtained from the solar cell 1, the DC power obtained by rectifying the AC power of the microgrid 5 by the bidirectional conversion circuit (input / output circuit 23). Electric power is output to the inverter circuit 22. For this reason, when the load 4 cannot be covered with the DC power obtained from the solar cell 1 and the power supplied from the microgrid 5, the power is supplied from the commercial power system 5. Thereby, it is possible to utilize the microgrid 5 that is advantageous in terms of the charge system for the customer to the maximum extent.

Moreover, when the power consumption of the load 4 is smaller than the DC power obtained from the solar cell 1, at least a part of this DC power is superimposed on the microgrid 5 by the bidirectional conversion circuit. For this reason, it is possible to sell power to the microgrid 5 which has an advantageous fee structure.

Further, according to the present embodiment, the power supplied from the microgrid 5 to the load 4 is converted into DC power by the input / output circuit 23, and then the commercial power system 3 by the inverter circuit 22.
Therefore, even if the AC power between the microgrid 5 and the commercial power system 3 is not synchronized, power can be supplied from the microgrid 5 to the load 4.

In addition, according to the present embodiment, when the power consumption of the load 4 is smaller than the DC power obtained from the solar cell 1, the insufficient power is supplied from the microgrid 5 to the load 4. The reverse power flow to the commercial power system 5 is prevented.

As mentioned above, although one Embodiment of this invention was described, the above description is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof.

For example, in this embodiment, although the example which made the commercial power grid 5 the 1st power grid was given,
A microgrid different from the microgrid 5 used as the second power system may be used as the first power system.

For example, in this embodiment, it is good to prevent the electric power of the commercial power grid 3 from being supplied to the microgrid 5. As a result, it is possible to prevent the high-priced commercial power system 5 from selling power to the low-priced microgrid 5 and losing power.

Further, for example, in the present embodiment, the description will be made on the assumption that the second power system (microgrid 5) is more advantageous than the first power system (commercial power system 3). I was trying to reverse flow to 5. However, if there is a possibility of a reversal in the power sale fee, the control circuit 25 inputs information on the power sale fee for the first power system and the power sale fee in the case of reverse power flow to the second power system. You may make it reversely flow the direct-current power obtained from the solar cell 1 to the one where a charge is higher.

Further, for example, in the present embodiment, when the control circuit 25 receives a command to reversely flow DC power obtained from the solar cell 1 to the microgrid 5 from the outside, and receives the reverse power flow command, the input / output circuit 23 may convert and superimpose a predetermined amount of DC power obtained from the solar cell 1 into AC power synchronized with the microgrid 5.

As a result, even when power is insufficient in the microgrid 5, the microgrid 5
Since the DC power obtained from the solar cell 1 can be reversely flowed in accordance with the reverse flow command transmitted from the side (external), it is possible to contribute to stabilization of the power supply of the microgrid 5.

Moreover, by this, when payment by electricity is permitted instead of money at the store 55 in the microgrid 5, a reverse power flow command can be issued from the store 55 side to collect electricity.

Further, for example, in the present embodiment, the available electric energy of the microgrid 5 is received from the outside, and the input / output circuit 23 can obtain the electric power obtained from the microgrid 5 for the available electric energy from the solar cell 1. It may be converted to DC power so as to be merged and supplied to the inverter circuit 22. Thereby, it is possible to use the power of the microgrid 5 after paying the power charge first. In addition, by this, when shopping at the store 55 in the microgrid 5 can be obtained and points can be converted into the amount of power that can be used in the microgrid 5, the control circuit 25 The amount of power that can be used by the microgrid 5 according to this point is received, and the power of the microgrid 5 can be used.

For example, in this embodiment, the power of the first power system (commercial power system 3) is the second power.
The power system (microgrid 5) is not supplied to the power system, but is provided with a conversion circuit that supplies power from the first power system to the input / output circuit 23, and the power of the first power system is the second power system. It may be supplied to the power system.

Specifically, by providing the same configuration as the bidirectional circuit 23a of the input / output circuit 23 between the inverter circuit 22 and the booster circuit 21, the inverter circuit 22 and the newly provided bidirectional circuit can A conversion circuit is configured to supply power from one power system to the input / output circuit. That is, the conversion circuit uses an inverter circuit.

By doing in this way, since the electric power of the commercial power system 3 can be supplied to the microgrid 3, it is possible to prevent the microgrid 3 from becoming unstable (power shortage).




DESCRIPTION OF SYMBOLS 1 Solar cell 2 Grid connection apparatus 3 Commercial power system (1st power system)
4 Load 5 Microgrid (second power system)
21 Booster Circuit 22 Inverter Circuit 23 Input / Output Circuit 24 Interconnection Relay 25 Control Circuit 51 Solar Power Plant 52 Wind Power Plant 53 Factory 54 School 55 Shop

Claims (4)

  1. A grid interconnection device including an inverter circuit that converts DC power obtained from renewable energy into AC power synchronized with the first power system, and supplies the AC power to the load after being superimposed on the first power system In
    The power connected to the second power system and converted from the power obtained from the second power system so as to be merged with the DC power is supplied to the inverter circuit, and at least a part of the DC power is supplied to the second power system. An input / output circuit that converts the AC power to be synchronized with the grid and superimposes the AC power on the second power grid;
    The input / output circuit includes a bidirectional conversion circuit that connects the DC power and a second power system, and when the power consumption of the load is larger than the DC power obtained from the renewable energy, the bidirectional conversion circuit When the DC power obtained by rectifying the AC power of the second power system is output to the inverter circuit, and the power consumption of the load is smaller than the DC power obtained from the renewable energy, at least a part of the DC power is A grid interconnection device, wherein the bidirectional converter circuit superimposes the second grid on a second power system.
  2. 2. The grid interconnection apparatus according to claim 1, wherein the inverter circuit includes a DC booster circuit in a previous stage and a configuration for stabilizing DC power after the boosting.
  3. A grid interconnection device including an inverter circuit that converts DC power obtained from renewable energy into AC power synchronized with the first power system, and supplies the AC power to the load after being superimposed on the first power system In
    The power connected to the second power system and converted from the power obtained from the second power system so as to be merged with the DC power is supplied to the inverter circuit, and at least a part of the DC power is supplied to the second power system. An input / output circuit that converts AC power synchronized with the grid and superimposes the AC power to the second power grid, and a conversion circuit that supplies power from the first power grid to the input / output circuit,
    The input / output circuit includes a bidirectional conversion circuit that connects the DC power and a second power system, and when the power consumption of the load is larger than the DC power obtained from the renewable energy, the bidirectional conversion circuit When the DC power obtained by rectifying the AC power of the second power system is output to the inverter circuit, and the power consumption of the load is smaller than the DC power obtained from the renewable energy, at least a part of the DC power is A grid interconnection device, wherein the bidirectional converter circuit superimposes the second grid on a second power system.
  4. The grid interconnection apparatus according to claim 3, wherein the conversion circuit uses the inverter circuit.
JP2012116100A 2012-05-22 2012-05-22 Grid interconnection device Expired - Fee Related JP5903661B2 (en)

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CN106300323B (en) * 2016-10-11 2019-03-08 耿天侃 Distributed generation resource power grid

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JPH06274233A (en) * 1993-03-24 1994-09-30 Sanyo Electric Co Ltd Power system
JP2004180467A (en) * 2002-11-29 2004-06-24 Hitachi Home & Life Solutions Inc Systematically interconnecting power supply system
WO2008047400A1 (en) * 2006-10-16 2008-04-24 Vpec, Inc. Electric power system
US7518266B2 (en) * 2006-11-01 2009-04-14 Electric Power Research Institute, Inc. Method and apparatus for improving AC transmission system dispatchability, system stability, and power flow controllability using DC transmission systems
ES2636570T3 (en) * 2009-03-12 2017-10-06 Vpec, Inc. Standalone Distributed AC Power System

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