WO2012124131A1

WO2012124131A1 - Power control device and power control method

Info

Publication number: WO2012124131A1
Application number: PCT/JP2011/056750
Authority: WO
Inventors: 潤一郎山田; 西川　武男; 亘岡田
Original assignee: オムロン株式会社
Priority date: 2011-03-15
Filing date: 2011-03-22
Publication date: 2012-09-20
Also published as: JP5338831B2; JP2012196024A

Abstract

　The present invention more reliably prevents power of different voltages flowing in the same path. A solar panel power conditioning system (21) converts DC voltage power generated by a solar panel, which generates electricity in response to irradiation with sunlight, into AC voltage power. A charger AC/DC converter (23) converts the AC voltage power output from the solar panel power conditioning system (21) into DC voltage power. Relays (31, 32) are connected in series to wiring that supplies power from a system to the charger AC/DC converter (23). Furthermore, a control unit (28) switches the relays (31, 32) off when an interruption in the supply of power from the system is detected. This invention can be applied, for instance, to a photovoltaic system provided with a photovoltaic panel and a storage battery.

Description

Power control apparatus and power control method

The present invention relates to a power control apparatus and a power control method, and more particularly to a power control apparatus and a power control method that can more reliably prevent power of different voltages from flowing into the same path.

In recent years, solar power generation systems equipped with solar power generation panels and storage batteries have become widespread. In such a photovoltaic power generation system, the DC voltage power generated by the photovoltaic power generation panel is converted into AC voltage power by the power conditioner and then supplied to the load for consumption or to the commercial power system. It is returned and sold. In addition, by charging the storage battery with the power generated by the solar power generation panel, stable power supply that is not affected by the weather is performed.

Generally, in a commercial power system, power with an AC voltage of 200 V is transmitted, while with loads such as home appliances, power with an AC voltage of 100 V is consumed. Therefore, the power conditioner is configured to convert the output of the DC voltage generated by the solar power generation panel into the power of the

AC voltage

100V or 200V and switch the output.

For example, Patent Document 1 discloses a power conversion device that can detect a system voltage of a power system and switch output power at an AC voltage of 100V or 200V.

Also, in the solar power generation system, when a power failure occurs and the supply of power from the commercial power system is stopped, the solar power generation system is in a self-sustaining operation mode in which independent operation is performed independently from the commercial power system. In the self-sustained operation mode, the electric power generated by the photovoltaic power generation panel or the electric power charged in the storage battery is converted into electric power having an AC voltage of 100 V by the power conditioner and supplied to the load.

For example, Patent Document 2 discloses an inverter device having a grid-connected operation mode that is linked to a commercial power system and a self-sustained operation mode that performs independent operation independently from the commercial power system.

JP 2002-112461 A JP 2005-278297 A

By the way, when a power failure occurs and the power conditioner outputs power of AC voltage 100V in the self-sustaining operation mode, when the power failure is restored and AC voltage 200V power is supplied from the commercial power system, the voltage differs. A situation occurs in which the power paths are in electrical contact, and power of different voltages flows into the same path. When such a situation occurs, the inverter may be damaged and break down.

In the power conversion device described in Patent Document 1, when an abnormality occurs in the control unit due to thermal runaway or the like, there is a possibility that the path of AC voltage 100V and the path of 200V contact. In addition, in the inverter device described in Patent Document 2, when a malfunction occurs in the control unit and the open / close state of the relay becomes uncontrollable, the power path output in the self-sustaining operation mode and the commercial power system There is a possibility of contact with the power path.

The present invention has been made in view of such a situation, and can more reliably prevent power of different voltages from flowing into the same path.

A power control apparatus according to one aspect of the present invention includes a first conversion unit that converts a DC voltage power output from a power generation unit that generates power using natural energy into an AC voltage power, and a first conversion unit. A second conversion means for converting the power of the alternating voltage output from the power into the power of the direct current voltage; a first opening / closing means for opening and closing a wiring for supplying power from the system to the second conversion means; And an opening / closing control means for opening the first opening / closing means when it is detected that the supply of electric power has stopped.

A power control method according to one aspect of the present invention includes a first conversion unit that converts DC voltage power output from a power generation unit that generates power using natural energy into AC voltage power, and first conversion unit. Power control comprising: second conversion means for converting the power of the alternating voltage output from the power into the power of the direct current voltage; and first opening / closing means for opening and closing a wiring for supplying power from the system to the second conversion means An apparatus power control method comprising the step of opening a first opening / closing means when detecting that the supply of power from the system has stopped.

In one aspect of the present invention, when it is detected that the supply of power from the system is stopped, the first opening / closing means for opening and closing the wiring for supplying power from the system to the second conversion means is opened.

According to one aspect of the present invention, it is possible to more reliably prevent power of different voltages from flowing into the same path.

It is a block diagram which shows the structural example of 1st Embodiment of the energy controller to which this invention is applied. It is a figure which shows the structural example of an exclusive circuit. The power path at the time of a power failure will be described. A description will be given of a power path in a normal state. It is a block diagram which shows the structural example of 2nd Embodiment of the energy controller to which this invention is applied. It is a block diagram which shows the structural example of 3rd Embodiment of the energy controller to which this invention is applied. It is a block diagram which shows the structural example of 4th Embodiment of the energy controller to which this invention is applied.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration example of a first embodiment of an energy controller to which the present invention is applied.

In FIG. 1, the energy controller 11 is connected to a solar panel (not shown) and connected to a commercial power system that supplies power with an AC voltage of 200 V via a distribution board 12.

The energy controller 11 charges the battery 13 with the electric power generated by the solar panel and the electric power supplied from the commercial power system, or the electric power generated by the solar panel and the electric power charged in the battery 13 as a load. Control power to be supplied. In addition, the energy controller 11 includes a normal operation mode that is an operation mode at a normal time when power is supplied from the commercial power system, and a self-sustained operation mode that is an operation mode at the time of a power failure when the supply of power from the commercial power system is stopped. I have. The energy controller 11 supplies power to the load via the distribution board 12 in the normal operation mode, and supplies power to the load connected to the independent output outlet 14 in the independent operation mode.

The energy controller 11 includes a solar panel PCS (Power Conditioning System) 21, a battery PCS 22, a charging AC / DC (Alternating Current / Direct Current) converter 23,

power monitors

25 and 26, and an input / output unit. 27 and a control unit 28.

In the energy controller 11,

relays

31 and 32 are connected in series to the wiring connecting the charging AC / DC converter 23 and the wiring breaker 44 of the distribution board 12. Furthermore, a relay 33 is connected to a wiring connecting the relay 32 and the charging AC / DC conversion unit 23 and a wiring connecting the self-sustained operation output terminal of the solar panel PCS 21. The relay 34 is connected to the wiring connecting the wiring breaker 44 and the relay 31 of the distribution board 12 and the battery PCS 22.

In the distribution board 12, the terminal 41 is connected to the power line of the commercial power system. In addition, the wiring connected to the terminal 41 is connected to the battery PCS 22 and the charging AC / DC conversion unit 23 via the leakage breaker 42, the breaker unit 43, and the wiring breaker 44. The solar panel PCS 21 is connected to the wiring connecting the terminal 41 and the earth leakage breaker 42 via the earth leakage breaker 45. The breaker unit 43 has a plurality of breakers, and a load such as an electric device in the house is connected through the breakers.

The solar panel PCS 21 adjusts the power generated by the solar panel (not shown), converts the DC voltage power generated by the solar panel into AC voltage power, and outputs it. For example, when the energy controller 11 is in the normal operation mode, the solar panel PCS 21 converts power supplied from the solar panel into power of an AC voltage of 200 V and supplies the power to the distribution board 12. This electric power is supplied to a load connected to each breaker of the breaker unit 43 via the earth leakage breaker 45 and the earth leakage breaker 42, or returned to the commercial power system via the earth leakage breaker 45 and the terminal 41 for sale. To do.

Moreover, the PCS 21 for solar panel is provided with a self-sustained operation output terminal. When a signal instructing the transition to the self-sustained operation mode (hereinafter referred to as a self-sustained operation signal as appropriate) is supplied from the control unit 28, the solar panel PCS 21 outputs power with an AC voltage of 100 V from the self-sustained operation output terminal. To do. The power output from the self-sustained operation output terminal of the solar panel PCS 21 is supplied to the charging AC / DC converter 23 via the relay 33.

The battery PCS 22 converts the electric power stored in the battery 13 into AC voltage electric power and outputs it. For example, when the energy controller 11 is in the normal operation mode, the battery PCS 22 converts the power supplied from the battery 13 into power having an AC voltage of 200 V and supplies the power to the distribution board 12 via the relay 34. This electric power is adjusted according to the power consumption at the load, supplied only to the load connected to the breaker unit 43 via the wiring breaker 44, and is prevented from flowing out to the commercial power system.

Further, the battery PCS 22 includes a self-sustained operation output terminal, and when a self-sustained operation signal is supplied from the control unit 28, outputs power with an AC voltage of 100 V from the self-sustained operation output terminal. The electric power output from the self-sustained operation output terminal of the battery PCS 22 is supplied to a load connected to the self-sustained output outlet 14 via the terminal 37.

The charging AC / DC conversion unit 23 converts AC voltage (100 V or 200 V) power into DC voltage power suitable for charging the battery 13, supplies the battery 13 with the power, and charges the battery 13. For example, the charging AC / DC conversion unit 23 checks the charge amount of the battery 13 and charges the battery 13 with a voltage controlled according to the charge amount. Depending on the amount of charge of the battery 13 or the like, the power output from the charging AC / DC conversion unit 23 is supplied to the battery PCS 22.

The power monitor 25 monitors the power input to the charging AC / DC conversion unit 23 and notifies the control unit 28 of the amount of power (current value A1 and voltage value V1). The power monitor 26 monitors the power supplied from the commercial power system to the distribution board 12 and notifies the control unit 28 of the amount of power (current value A2 and voltage value V2). The amount of power (current value A3 and voltage value V3) output from the charging AC / DC conversion unit 23 is notified to the control unit 28 by the charging AC / DC conversion unit 23.

The input / output unit 27 is an interface (for example, System I / O board) for communication between each unit in the energy controller 11 and the control unit 28.

The control unit 28 communicates with each unit in the energy controller 11 via the input / output unit 27 to perform various controls.

For example, when the control unit 28 detects that the supply of power from the commercial power system is stopped based on the amount of power notified from the power monitor 26, that is, when a power failure is detected, A self-sustained operation signal is supplied to the battery PCS 22. At this time, the control unit 28 controls to turn off the connection of the relays 31 and 32 (open state) and turn on the connection of the relay 33 (connected state).

Further, for example, when the control unit 28 detects that the power failure has been recovered and the supply of power from the commercial power system has been started, the control unit 28 releases the self-sustained operation for the solar panel PCS 21 and the battery PCS 22. Supply the signal. At this time, the control unit 28 performs control to turn on the connection of the

relays

31 and 32 and turn off the connection of the relay 33.

Thus, in the energy controller 11, in the self-sustained operation mode, the connections of the

relays

31 and 32 are turned off and the connection of the relay 33 is turned on. On the other hand, in the normal operation mode, the connections of the

relays

31 and 32 are turned on. The connection 33 is turned off. In this way, the relays 31 to 33 constitute an exclusive circuit so that the

relays

31 and 32 and the relay 33 function exclusively on and off.

FIG. 2 is a diagram illustrating a configuration example of an exclusive circuit configured by the relays 31 to 33.

The relay 31 includes a coil 31a,

main switches

31b and 31c, and an auxiliary switch 31d. The

main switches

31b and 31c are normally open, and the auxiliary switch 31d is normally closed. That is, in the relay 31, the

main switches

31b and 31c are closed while the current is flowing through the coil 31a, while the auxiliary switch 31d is opened and the current is not flowing through the coil 31a. 31c is opened, while auxiliary switch 31d is closed.

The relay 32 includes a coil 32a, main switches 32b and 32c, and an auxiliary switch 32d, and performs the same operation as the relay 31.

The relay 33 includes a coil 33a,

main switches

33b and 33c, and

auxiliary switches

33d and 33e. The

main switches

33b and 33c are normally open, and the

auxiliary switches

33d and 33e are normally closed. That is, in the relay 33, the

main switches

33b and 33c are closed while the current is flowing through the coil 33a, while the

auxiliary switches

33d and 33e are opened, and the

main switch

33b and 33c are not flowing through the coil 33a. 33b and 33c are opened, while

auxiliary switches

33d and 33e are closed.

One terminal of the

main switches

31b and 31c of the relay 31 is connected to a power line of a commercial power system that supplies power of an AC voltage of 200 V via the distribution board 12 of FIG. The other terminals of the

main switches

31b and 31c of the relay 31 are connected to one terminal of the main switches 32b and 32c of the relay 32, and the other terminals of the main switches 32b and 32c of the relay 32 are connected to the charging AC / The DC converter 23 is connected.

Further, one terminal of the

main switches

33b and 33c of the relay 33 is connected to the self-sustained operation output terminal of the PCS 21 for solar panel, and the other terminal of the

main switches

33b and 33c of the relay 33 is connected to the relay 32 and the charge. It is connected to the wiring which connects the AC / DC conversion unit 23 for use.

Here, the input / output unit 27 has a terminal A, a terminal B, and a terminal C that apply a voltage of +24 V, and a voltage is applied to the terminal A, the terminal B, and the terminal C according to the control of the control unit 28. Thus, opening / closing of the relays 31 to 33 is controlled.

Between the terminal A and GND of the input / output unit 27, an auxiliary switch 31d of the relay 31, an auxiliary switch 32d of the relay 32, and a coil 33a of the relay 33 are connected in series. Between terminal B of input / output unit 27 and GND, coil 31a of relay 31 and auxiliary switch 33e of relay 33 are connected in series. Between the terminal C and GND of the input / output unit 27, a coil 32a of the relay 32 and an auxiliary switch 33d of the relay 33 are connected in series.

With such a connection configuration, the connection to the charging AC / DC conversion unit 23 is exclusive between the commercial power system and the solar panel PCS 21. That is, when the charging AC / DC conversion unit 23 and the commercial power system are connected, the connection between the charging AC / DC conversion unit 23 and the solar panel PCS 21 is released. On the other hand, when the charging AC / DC conversion unit 23 and the solar panel PCS 21 are connected, the connection between the charging AC / DC conversion unit 23 and the commercial power system is released.

Specifically, in the normal operation mode, the control unit 28 applies a voltage of + 24V to the terminal B and the terminal C of the input / output unit 27 and stops applying the voltage to the terminal A of the input / output unit 27 (0V Control).

Thereby, in the relay 31, a current flows through the coil 31a, the

main switches

31b and 31c are closed and energized, and the auxiliary switch 31d is opened. In the relay 32, a current flows through the coil 32a, the main switches 32b and 32c are closed and energized, and the auxiliary switch 32d is opened. In the relay 33, the

main switches

33b and 33c are opened and cut off, and the

auxiliary switches

33d and 33e are closed. Therefore, in the normal operation mode, the charging AC / DC conversion unit 23 and the commercial power system are connected, while the connection between the charging AC / DC conversion unit 23 and the solar panel PCS 21 is released. .

In this state, it is assumed that a problem occurs and a voltage of +24 V is applied to the terminal A of the input / output unit 27. In this case, since the auxiliary switch 31d of the relay 31 and the auxiliary switch 32d of the relay 32 are opened, no current flows through the coil 33a of the relay 33, and the

main switches

33b and 33c of the relay 33 are closed. Absent. That is, even in this case, the state where the connection between the charging AC / DC conversion unit 23 and the solar panel PCS 21 is released is maintained, and the

main switches

33b and 33c of the relay 33 are prevented from being energized. .

In the self-sustained operation mode, the control unit 28 applies a voltage of +24 V to the terminal A of the input / output unit 27 and stops applying the voltage to the terminals B and C of the input / output unit 27 (set to 0 V). Take control.

Thereby, in the relay 31, the

main switches

31b and 31c are opened and cut off, and the auxiliary switch 31d is closed. Further, in the relay 32, the main switches 32b and 32c are opened and cut off, and the auxiliary switch 32d is closed. In the relay 33, a current flows through the coil 33a, the

main switches

33b and 33c are closed and energized, and the

auxiliary switches

33d and 33e are opened. Therefore, in the self-sustaining operation mode, the charging AC / DC conversion unit 23 and the solar panel PCS 21 are connected, while the connection between the charging AC / DC conversion unit 23 and the commercial power system is released. .

In this state, it is assumed that a problem occurs and a voltage of +24 V is applied to the terminals B and C of the input / output unit 27. In this case, since the

auxiliary switches

33d and 33e of the relay 33 are open, no current flows through the coil 31a of the relay 31 and the coil 32a of the relay 32, and the

main switches

31b and 31c of the relay 31 and the main switch of the relay 32 The switches 32b and 32c are never closed. That is, even in this case, the connection between the charging AC / DC converter 23 and the commercial power system is maintained, and the

main switches

31b and 31c of the relay 31 and the main switches 32b and 32c of the relay 32 are energized. This is avoided.

Next, with reference to FIG. 3 and FIG. 4, the power path of the energy controller 11 at the time of power failure and normal time will be described. In FIG. 3 and FIG. 4, each power path is represented by a thick line.

Fig. 3 shows the power path during a power failure.

As described above, when the control unit 28 detects that the supply of power from the commercial power system is stopped based on the amount of power notified from the power monitor 26, the control unit 28 controls the solar panel PCS 21 and the battery PCS 22. Supply a self-sustained operation signal. At the same time, the control unit 28 turns off the connection of the relays 31 and 32 (stops the application of voltage to the terminals B and C in FIG. 2) and turns on the connection of the relay 33 (the terminal A in FIG. 2). Voltage of + 24V is applied).

The solar panel PCS 21 converts the power of the DC voltage supplied from the solar panel into the power of the AC voltage 100V in accordance with the self-sustained operation signal, and outputs it from the self-sustained operation output terminal. At this time, since the connection of the relay 33 is on, the power output from the self-sustained operation output terminal of the solar panel PCS 21 is supplied to the charging AC / DC conversion unit 23 via the relay 33.

At this time, since the connection of the

relays

31 and 32 is off, the power output from the solar panel PCS 21 does not flow to the distribution board 12 side. Furthermore, in the energy controller 11, since the

relays

31 and 32 are connected in series, even if one of the

relays

31 and 32 breaks down and the connection cannot be turned off, it depends on the person who has not failed. The connection can be turned off. As described above, by connecting the

relays

31 and 32 in series, it is possible to more reliably perform control so that power is not output to the distribution board 12.

The charging AC / DC conversion unit 23 converts the AC voltage power supplied from the solar panel PCS 21 into DC voltage power, and supplies it to the battery 13 or the battery PCS 22. Note that whether the power output from the charging AC / DC conversion unit 23 is supplied to the battery 13 or the battery PCS 22 depends on the amount of charge of the battery 13 or the load connected to the independent output outlet 14. It depends on the power consumption (that is, the amount of power output from the battery PCS 22) and the like.

The battery PCS 22 converts the DC voltage power supplied from the charging AC / DC converter 23 or the DC voltage power charged in the battery 13 into AC voltage power of 100 V in accordance with the self-sustained operation signal. Output from the self-sustained operation output terminal. Thereby, the power output from the self-sustained operation output terminal of the battery PCS 22 is supplied to the load connected to the self-sustained output outlet 14.

At this time, the earth leakage breaker 45 is turned off by the user who has detected a power failure, and the electrical connection between the solar panel PCS 21 and the commercial power system is cut. Even if the earth leakage breaker 45 is not turned off, in the self-sustaining operation mode, the solar panel PCS 21 does not output power to the terminals connected to the commercial power system, and the solar panel PCS 21 does not output power. No power flows out to 12.

In addition, a relay that can be controlled to open and close by the control unit 28 is connected between the solar panel PCS 21 and the leakage breaker 45 so that when the control unit 28 detects a power failure, the relay is turned off. Also good. The control unit 28 also turns off the connection of the relay 34 and disconnects the electrical connection between the battery PCS 22 and the commercial power system.

FIG. 4 shows a power path in a normal time.

For example, when the control unit 28 detects that the supply of power from the commercial power system has been resumed (recovering from a power failure) based on the amount of power notified from the power monitor 26, the control unit 28 causes the PCS 21 for solar panels and the PCS 22 for batteries to In response, a signal for releasing the independent operation is supplied. At the same time, the control unit 28 turns on the connection of the relays 31 and 32 (applies a voltage of +24 V to the terminals B and C in FIG. 2) and turns off the connection of the relay 33 (the terminal A in FIG. 2). To stop the voltage application). The control unit 28 also turns on the connection of the relay 34.

The solar panel PCS 21 stops the output of the power from the self-sustained operation output terminal according to the signal for canceling the self-sustained operation, converts the power of the DC voltage supplied from the solar panel into the power of the AC voltage 200V, Supply to distribution board 12. Thereby, the electric power generated by the solar panel is supplied to the load connected to the breaker unit 43 of the distribution board 12. At this time, the earth leakage breaker 45 is turned on by the user who has detected the recovery from the power failure.

Since the connection of the relay 33 is off, even if the AC voltage 100V is output from the self-sustained operation output terminal of the solar panel PCS 21, the AC voltage 100V and the commercial power are output. It is avoided that the power of the AC voltage 200V supplied from the power system flows into the same path.

The charging AC / DC conversion unit 23 converts the power of the AC voltage 200 V supplied from the commercial power system into the power of the DC voltage, and supplies it to the battery 13.

The battery PCS 22 converts the DC voltage power supplied from the battery 13 into the AC voltage 200 V according to the signal for canceling the self-sustained operation, and supplies it to the distribution board 12 via the relay 34. Thereby, the electric power charged in the battery 13 is supplied to the load connected to the breaker unit 43 of the distribution board 12.

As described above, in the energy controller 11, the power path is switched during a power failure and during a normal time.

For example, since the connection of the relay 33 is turned on and the connection of the

relays

31 and 32 is turned off at the time of a power failure, the power output from the self-sustained operation output terminal of the solar panel PCS 21 flows out to the distribution board 12 side. This can be prevented. Thereby, even if there is a worker who is working to recover from a power failure on the commercial power system side, the work can be performed safely, and the safety can be ensured.

Further, when the power failure is restored, the connection of the

relays

31 and 32 is turned on and the connection of the relay 33 is turned off. Therefore, the power of the AC voltage 200 V supplied from the commercial power system and the PCS 21 for solar panel are used. The situation where the power of the AC voltage 100V output from the self-sustained operation output terminal flows into the same path is avoided. Thereby, the failure assumed when such a situation generate | occur | produces can be avoided and the reliability of the energy controller 11 can be improved.

Next, FIG. 5 is a block diagram showing a configuration example of the second embodiment of the energy controller to which the present invention is applied.

In FIG. 5, the energy controller 11A is connected to a solar panel (not shown) as in the energy controller 11 of FIG. It is connected.

The energy controller 11A has the same configuration as the energy controller 11 of FIG. 1 in that it includes a solar panel PCS 21, a battery PCS 22, power monitors 25 and 26, an input / output unit 27, and a control unit 28. The detailed explanation is omitted. In other words, the energy controller 11A is different from the energy controller 11 in that it includes a charging AC / DC converter 23A.

Further, as shown in FIG. 5, the energy controller 11A does not include the relays 31 to 33 included in the energy controller 11, and the wiring from the distribution board 12 is directly connected to the charging AC / DC converter 23A. While being connected, the self-sustained operation output terminal of the solar panel PCS 21 is directly connected. That is, in the energy controller 11A, the charging AC / DC conversion unit 23A has a built-in function of an exclusive circuit formed by the relays 31 to 33.

Therefore, in the energy controller 11A, the control unit 28 also supplies the independent operation signal to the charging AC / DC conversion unit 23A, and within the charging AC / DC conversion unit 23A, The connection with the self-sustained operation output terminal of the optical panel PCS 21 is switched exclusively.

That is, in the energy controller 11A, during a power failure, the charging AC / DC conversion unit 23A releases the connection with the commercial power system according to the self-sustained operation signal and connects with the self-sustained operation output terminal of the solar panel PCS 21. As described above, the exclusive circuit is switched inside the charging AC / DC conversion unit 23A. Further, when the power failure is restored, the charging AC / DC conversion unit 23A releases the connection with the self-sustained operation output terminal of the solar panel PCS 21 according to the signal for canceling the self-sustaining operation and connects with the commercial power system. As described above, the exclusive circuit is switched inside the charging AC / DC conversion unit 23A.

As a result, in the energy controller 11A, as in the energy controller 11 in FIG. 1, in addition to ensuring safety and reliability, the charging AC / DC conversion unit 23A has a function of an exclusive circuit. By doing so, the apparatus can be simplified and downsized.

Next, FIG. 6 is a block diagram showing a configuration example of a third embodiment of the energy controller to which the present invention is applied.

In FIG. 6, the energy controller 11B is connected to a solar panel (not shown) as in the energy controller 11 of FIG. 1, and is connected to a commercial power system that supplies power of an AC voltage of 200 V via the distribution board 12. It is connected.

The energy controller 11B has the same configuration as the energy controller 11 of FIG. 1 in that it includes a solar panel PCS 21, power monitors 25 and 26, an input / output unit 27, a control unit 28, and relays 31 to 33. Detailed description is omitted. That is, the energy controller 11B is different from the energy controller 11 in that it includes a bidirectional AC / DC converter 23B.

The bidirectional AC / DC conversion unit 23B converts the AC voltage power supplied via the distribution board 12 into DC voltage power, and supplies the battery 13 for charging. In addition, the bidirectional AC / DC conversion unit 23B converts the DC voltage power supplied from the battery 13 into AC voltage power during normal operation, and supplies the AC voltage power to each breaker of the breaker unit 43 via the distribution board 12. Supply the connected load. In addition, the bidirectional AC / DC conversion unit 23B is supplied from the power obtained by converting the power of the DC voltage supplied from the battery 13 into the AC voltage or the self-sustained operation output terminal of the solar panel PCS 21 during a power failure. The power of the AC voltage is supplied to the load connected to the outlet 14 for independent output.

That is, the bidirectional AC / DC conversion unit 23B has a configuration including both functions of the battery PCS 22 and the charging AC / DC conversion unit 23 of FIG.

In the energy controller 11B, the control unit 28 performs control to turn off the connection of the

relays

31 and 32 and turn on the connection of the relay 33 during a power failure. Further, in a normal time, the control unit 28 performs control to turn on the connection of the

relays

31 and 32 and turn off the connection of the relay 33. That is, in the energy controller 11B, as in the energy controller 11 of FIG. 1, the relays 31 to 33 constitute an exclusive circuit.

Therefore, the energy controller 11B can ensure safety and reliability in the same manner as the energy controller 11 of FIG. 1, and in addition, the bidirectional AC / DC conversion unit 23B is connected to the battery PCS 22 of FIG. By providing both functions of the charging AC / DC conversion unit 23, the device can be simplified and downsized.

Next, FIG. 7 is a block diagram showing a configuration example of a fourth embodiment of the energy controller to which the present invention is applied.

In FIG. 7, the energy controller 11C is connected to a solar panel (not shown) as in the energy controller 11 of FIG. 1, and is connected to a commercial power system that supplies power with an AC voltage of 200 V via the distribution board 12. It is connected.

The energy controller 11C has the same configuration as the energy controller 11 of FIG. 1 in that it includes a solar panel PCS 21, power monitors 25 and 26, an input / output unit 27, and a control unit 28, and detailed description thereof is omitted. To do. That is, the energy controller 11C has a configuration different from the energy controller 11 in that the bidirectional AC / DC conversion unit 23C is provided.

Further, as shown in FIG. 7, the energy controller 11C does not include the relays 31 to 33 included in the energy controller 11, and the wiring from the distribution board 12 is directly connected to the bidirectional AC / DC conversion unit 23C. While being connected, the self-sustained operation output terminal of the solar panel PCS 21 is directly connected.

That is, in the energy controller 11C, the bidirectional AC / DC conversion unit 23C has a built-in function of the exclusive circuit formed by the relays 31 to 33. Therefore, in the energy controller 11C, the control unit 28 also supplies the self-sustained operation signal to the bidirectional AC / DC conversion unit 23C, and in the bidirectional AC / DC conversion unit 23C, connection with the commercial power system, solar The connection with the self-sustained operation output terminal of the optical panel PCS 21 is switched exclusively.

Further, the bidirectional AC / DC conversion unit 23C is configured to have both functions of the battery PCS 22 and the charging AC / DC conversion unit 23 of FIG. 1 as with the bidirectional AC / DC conversion unit 23B of FIG. Is done.

That is, in the energy controller 11C, in the event of a power failure, the bidirectional AC / DC conversion unit 23C releases the connection with the commercial power system according to the self-sustained operation signal and connects with the self-sustained operation output terminal of the solar panel PCS 21. As described above, the exclusive circuit is switched inside the bidirectional AC / DC converter 23C. The bidirectional AC / DC converter 23C converts the DC voltage power supplied from the battery 13 into an AC voltage, or the AC voltage power supplied from the self-sustained operation output terminal of the solar panel PCS 21. Is supplied to the load connected to the outlet 14 for self-supporting output.

In the energy controller 11C, when the power failure is restored, the bidirectional AC / DC conversion unit 23C releases the connection with the self-sustained operation output terminal of the solar panel PCS 21 in accordance with a signal for canceling the self-sustained operation. The exclusive circuit is switched inside the bidirectional AC / DC converter 23C so as to be connected to the power system. The bidirectional AC / DC conversion unit 23C converts the DC voltage power supplied from the battery 13 into AC voltage power, and loads connected to the breakers of the breaker unit 43 via the distribution board 12. To supply.

Therefore, in the energy controller 11C, safety and reliability can be ensured similarly to the energy controller 11 in FIG. Furthermore, in the energy controller 11C, the bidirectional AC / DC conversion unit 23C incorporates the functions of the exclusive circuit and the functions of both the battery PCS 22 and the charging AC / DC conversion unit 23 of FIG. Further simplification and downsizing of the apparatus can be achieved.

In the above-described embodiment, the exclusive circuit is configured by the relays 31 to 33. However, the exclusive circuit may not necessarily be configured by the relays 31 to 33. That is, the control unit 28 may independently control the opening and closing of the relays 31 to 33 based on the supply of power from the commercial power system. When a power failure is detected, at least the

relays

31 and 32 are turned off. Thus, safety and reliability can be ensured. Then, the control unit 28 may turn on the relay 33 after turning off the

relays

31 and 32. As the relays 31 to 33, in addition to the one driven at 24V described in FIG. 2, for example, one driven at a voltage according to the design, such as one driven at 12V, can be adopted.

Furthermore, in the present embodiment, a power generation system using a solar power generation panel as a power generation means has been described. However, the present technology generates power using natural energy, such as wind power generation, in addition to a solar power generation panel. The present invention can be applied to a power generation system that uses power generated by power generation means.

The embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

11 Energy controller, 12 Distribution board, 13 Battery, 14 Stand-alone output outlet, 21 Solar panel PCS, 22 Battery PCS, 23 Charging AC / DC conversion unit, 25 and 26 Power monitor, 27 Input / output unit, 28 control unit, 31 to 34 relay, 37 terminal, 41 terminal, 42 earth leakage breaker, 43 breaker part, 44 wiring breaker, 45 earth leakage breaker

Claims

First conversion means for converting DC voltage power output from power generation means for generating power using natural energy into AC voltage power;
Second conversion means for converting AC voltage power output from the first conversion means into DC voltage power;
First opening / closing means for opening / closing a wiring for supplying power from the system to the second conversion means;
An open / close control means for opening the first open / close means when detecting that the supply of electric power from the system is stopped.
A second opening / closing means for opening / closing a wiring for supplying electric power from the first conversion means to the second conversion means;
The power control apparatus according to claim 1, wherein the opening / closing control means closes the second opening / closing means when detecting that the supply of electric power from the system is stopped.
The power control apparatus according to claim 2, wherein the first opening / closing means and the second opening / closing means are configured by an exclusive circuit.
The power control apparatus according to claim 2 or 3, wherein the first opening / closing means and the second opening / closing means are incorporated in the second conversion means.
The power output from the second conversion means or the power stored in the storage means for storing the power output from the second conversion means is converted into AC voltage power and supplied to the load. The power control apparatus according to claim 1, further comprising third conversion means.
The power control apparatus according to claim 5, wherein the second conversion unit and the third conversion unit are integrally configured.
The first conversion means for converting the power of the DC voltage output from the power generation means for generating power using natural energy into the power of the AC voltage, and the power of the AC voltage output from the first conversion means, In a power control method of a power control apparatus comprising: a second conversion unit that converts power into a DC voltage; and a first opening / closing unit that opens and closes a wiring that supplies power to the second conversion unit from a system.
A power control method comprising: opening the first opening / closing means when detecting that the supply of power from the system is stopped.