CN204046188U - Grid-connecting apparatus - Google Patents
Grid-connecting apparatus Download PDFInfo
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- CN204046188U CN204046188U CN201290001017.3U CN201290001017U CN204046188U CN 204046188 U CN204046188 U CN 204046188U CN 201290001017 U CN201290001017 U CN 201290001017U CN 204046188 U CN204046188 U CN 204046188U
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The purpose of this utility model is to provide a kind of grid-connecting apparatus that easily can utilize the load worked under single-phase alternating current.For this reason, of the present utility modelly to be characterised in that, possess: inverter circuit (5), alternating current is outputted to U phase line (Lu), V phase line (Lv), these 3 output lines (Lu, Lv, Lw) of W phase line (Lw) by it, grid-connected relay (7), its Jie is 3 output lines (Lu, Lv, Lw), and carries out the connection/off-the-line of commercial electric power system (3) and inverter circuit (5), with wiring (La, Lb), it is respectively from 3 output line (Lu, Lv, Lw) 2 output lines in branch out, and be connected with load via independent operation relay (8), when commercial electric power system (3) and inverter circuit (5) carry out interconnection running, inverter circuit (5) by overlapping for three-phase alternating current to commercial electric power system (3), when carrying out disconnecting inverter circuit (5) from commercial electric power system (3) and supplying the independent operation of electric power to load, DC power conversion is become single-phase alternating current and outputs to wiring (La by inverter circuit (5), Lb).
Description
Technical field
The utility model relates to and the DC power conversion exported from the DC power supply such as solar cell, fuel cell or storage battery is alternating current and by overlapping for this alternating current grid-connecting apparatus to commercial system.
Background technology
All the time, the DC power conversion provided the DC power supply such as solar cell, fuel cell or storage battery export is alternating current and is interconnected to the grid-connecting apparatus of three-phase commercial electric power system by grid-connected relay.
Grid-connecting apparatus is made up of inverter circuit, filter circuit, grid-connected relay and control circuit etc.The DC power conversion exported from DC power supply is become to have the three-phase alternating current of U phase, V phase, W phase by inverter circuit, and this alternating current is outputted to U phase line, V phase line, these 3 output lines of W phase line.Filter circuit has multiple filter electricity container, and makes a part for the output current of inverter circuit flow to filter electricity container from output line, makes the electric current eliminated after the higher harmonic components of output current flow to output line.Grid-connected relay is connected between filter circuit and commercial electric power system, is carried out the off-the-line/connection of DC power supply and commercial electric power system by its opening and closing.Control circuit is made up of microcomputer, provides signal, and carry out the control of the action of inverter circuit and grid-connected relay to inverter circuit and grid-connected relay.
In addition, in three-phase grid device, exist when commercial electric power system is in power failure, carry out disconnecting and grid-connecting apparatus (patent documentation 1) to the independent operation that load supplies with commercial electric power system.3 wirings that such three-phase grid device is branching out respectively from 3 output lines, are connected with load via the relay of independent operation.Then, when carrying out independent operation, open grid-connected relay to disconnect commercial electric power system and grid-connecting apparatus, and closed independent operation relay comes to 3 wiring supply three-phase alternating currents.
Patent documentation 1:JP Unexamined Patent 11-27957 publication
Utility model content
The problem that utility model will solve
But load used in the event of a loss of power is all urgent load, so mostly all utilize the single-phase alternating current that power consumption is less.Therefore, need when independent operation can easily use the load utilizing single-phase alternating current.
The utility model is the utility model of making in view of the above problems, and object is to provide a kind of grid-connecting apparatus that easily can utilize the load worked under single-phase alternating current.
In order to reach above-mentioned purpose, be of the present utility modelly characterised in that to possess: inverter circuit, DC power conversion is become to have the three-phase alternating current of U phase, V phase, W phase by it, and this alternating current is outputted to U phase line, V phase line, these 3 output lines of W phase line, grid-connected relay, it is installed on described 3 output lines, and carries out the connection/off-the-line of commercial electric power system and described inverter circuit, and wiring, it branches out from 2 output lines described 3 output lines respectively, and be connected with load via independent operation relay, when described commercial electric power system and described inverter circuit carry out interconnection running, grid-connectedly to connect described with relay, by described independent operation relay off-the-line, described inverter circuit is by overlapping for described three-phase alternating current extremely described commercial electric power system, when carrying out disconnecting described inverter circuit from described commercial electric power system and supplying the independent operation of electric power to described load, by described grid-connected relay off-the-line, described independent operation relay is connected, described DC power conversion is become single-phase alternating current and outputs to described wiring by described inverter circuit.
According to the utility model, not three-phase alternating current be supplied to the wiring of independent operation when independent operation but single-phase alternating current be supplied to the wiring of independent operation, therefore, it is possible to easily utilize the load worked under single-phase alternating current.
In addition, the feature of above-mentioned utility model is, described commercial electric power system is the power-supply system of the V wiring that V phase is grounded, described inverter circuit will be connected in series with the Bridge 1 arm circuit of 2 switch elements, the Bridge 2 arm circuit being connected in series with 2 switch elements and the series circuit being connected in series with 2 capacitors are connected in parallel and form, the tie point of 2 switch elements of described Bridge 1 arm circuit is connected with described U phase line, the tie point of 2 switch elements of described Bridge 2 arm circuit is connected with described W phase line, the tie point of 2 capacitors of described series circuit is connected with described V phase line, described wiring branches out from described U phase line and described W phase line.
In addition, the feature of above-mentioned utility model is, when carrying out described interconnection running, the switch timing of the switch element of described Bridge 1 arm circuit is decided based on the line current flowing to described U phase line, the switch timing of the switch element of described Bridge 2 arm circuit is decided based on the line current flowing to described W phase line, when carrying out described independent operation, decide the switch timing of the switch element of Bridge 1 arm circuit and the switch element of Bridge 2 arm circuit based on the voltage being applied to described U phase line and W phase line.
In addition, the feature of above-mentioned utility model is, described inverter circuit will be connected in series with the Bridge 1 arm circuit of 2 switch elements, the Bridge 2 arm circuit being connected in series with 2 switch elements and the 3rd bridge arm circuit being connected in series with 2 switch elements are connected in parallel and form, the tie point of 2 switch elements of described Bridge 1 arm circuit is connected with described U phase line, the tie point of 2 switch elements of described Bridge 2 arm circuit is connected with described W phase line, the tie point of 2 switch elements of described 3rd bridge arm circuit is connected with described V phase line, when carrying out described independent operation, the switch element of the described bridge arm circuit be connected with the output line of the branch not having described wiring is ended, and PWM control is carried out to the switch element of the described bridge arm circuit be connected with the output line branching out described wiring and described single-phase alternating current is supplied to described wiring.
In addition, the feature of above-mentioned utility model is to possess selection circuit, and this selection circuit branches out wiring respectively from described 3 output lines, and from 3 described wirings, selects described 2 be connected to load.
In addition, the feature of above-mentioned utility model is, the running number of times of each described independent operation or every determined described independent operation, all changes and carrys out selected wiring by described selection circuit.
Utility model effect
According to the utility model, a kind of grid-connecting apparatus that easily can utilize the load worked under single-phase alternating current can be provided.
Accompanying drawing explanation
Fig. 1 is the pie graph of the solar power system 100 represented involved by the 1st execution mode.
Fig. 2 is the figure of connection when representing the relay employing the contact chip with suitching type.
Fig. 3 is the pie graph of the solar power system 100a represented involved by the 2nd execution mode.
Fig. 4 is the figure of the connection represented for selecting 2 selection circuits connected up 80.
Embodiment
(the 1st execution mode)
Below, based on accompanying drawing, the 1st execution mode of the present utility model is described in detail.Fig. 1 is the pie graph of the solar power system 100 represented involved by the 1st execution mode.Solar power system 100 as shown in the drawing possesses solar cell 1 (DC power supply), grid-connecting apparatus 2.
Grid-connecting apparatus 2 possesses booster circuit 4, inverter circuit 5, filter circuit 6, grid-connected relay 7, independent operation relay 8, control circuit 9.Grid-connecting apparatus 2 carries out following interconnection running: the three-phase alternating current exported by inverter circuit 5 via grid-connected relay 7 is overlapping to commercial electric power system 3.In addition, when commercial electric power system 3 has a power failure, following independent operation is carried out: disconnect inverter circuit 5 and commercial electric power system 3 and single-phase alternating current is supplied to load 10.
As shown in the figure, be the commercial electric power system of V wiring with U phase, V phase, W phase, V phase is grounded commercial electric power system 3.U phase has the phase place of more advanced than V phase 120 °, and W phase has the phase place than backward 120 ° of V phase.
Booster circuit 4 boosts to the direct voltage exported from solar cell 1.Then, the direct voltage after this boosting exports to inverter circuit 5 by booster circuit 4.Booster circuit 4 as shown in Figure 1, has the such switch element 42 of reactor 41, IGBT (igbt) and diode 43 and forms.The input side of booster circuit 4 is connected with solar cell 1, and the positive pole of reactor 41 and diode 43 and solar cell 1 is connected in series.Switch element 42 is connected between the tie point of reactor 41 and diode 43 and the negative pole of solar cell 1, to carrying out opening and closing therebetween.
Booster circuit 4 carrys out control action by control circuit 9.Specifically, control circuit 9 determines conducting (ON) duty ratio, and will be supplied to the grid of switch element 42 with having the pulse signal cycle of this duty ratio.So switch element 42 periodically opening and closing, booster circuit 4 obtains the step-up ratio of (such as, proportional) regulation corresponding to duty ratio.
Inverter circuit 5 has 2 capacitors 51,52 and multiple switch element 53 ~ 56, and the DC power conversion exported from solar cell 1 via booster circuit 4 is become three-phase alternating current.Capacitor 51 and 52 is connected in series and constitutes series circuit.This series circuit is connected with the negative pole of diode 43 with solar cell 1.In addition, switch element 53 and switch element 54 are connected in series and form Bridge 1 arm circuit, and switch element 55 and switch element 56 are connected in series and form Bridge 2 arm circuit.These series circuits, Bridge 1 arm circuit and Bridge 2 arm circuit in parallel connect by inverter circuit 5 respectively, thus constitute semi-bridge type three-phase inverter circuitry.In addition, the tie point of 2 capacitors 51,52 of series circuit is connected with V phase line Lv, the tie point of 2 switch elements 53,54 of Bridge 1 arm circuit is connected with U phase line Lu, and the tie point of 2 switch elements 55,56 of Bridge 2 arm circuit is connected with W phase line Lw.
For the switch element 53 ~ 56 of inverter circuit 5, the switch element that IGBT is such can be used.Inverter circuit 5 controls its action by control circuit 9.Action about inverter circuit 5 will describe later.
Filter circuit 6 has reactor 61,62 and 3 filter electricity container 63a, 63b, 63c.In addition, the tie point of the tie point of filter circuit 6 and switch element 51 and switch element 52, switch element 53 and switch element 54 is connected (outlet side being arranged at inverter circuit 5) with the tie point of capacitor 51 and capacitor 51.Specifically, reactor 61 is situated between and is U phase line Lu, and reactor 62 is situated between and is W phase line Lw.Each filter electricity container 63a, 63b, 63c by wiring between each output line of 3 output lines Lu, Lv, Lw.In addition, each filter electricity container 63a ~ 63c such as to use at the capacitor of capacity.Filter circuit 6 output current of inverter circuit 5 is divided into flow to filter electricity container 63a, 63b, 63c condenser current and flow to the filter current of output line Lu, Lv, Lw.Thus, the filter current after the higher harmonic components of the output current of inverter circuit 5 is removed, is flowed to output line Lu, Lv, Lw of commercial electric power system 3 side, is fed into commercial electric power system 30 by filter circuit 6.
By being situated between, grid-connected relay 7 is that the contact chip of output line Lu, Lv, the Lw (between filter circuit 6 and commercial electric power system 3) be connected with commercial electric power system 3 carries out the opening and closing of output line Lu, Lv, Lw.This grid-connected relay 7 by controlling closure state and off-state from the control signal of control circuit 9, and is connected (interconnection) or off-the-line to inverter circuit 5 with commercial system 30.
By being situated between, independent operation relay 8 is that the contact chip of wiring La, the Lb branched out respectively from U phase line Lu and W phase line Lw carries out the opening and closing of wiring La, Lb.This independent operation relay 8 by controlling closure state and off-state from the control signal of control circuit 9, and is connected or off-the-line with load 10 inverter circuit 5.
Control circuit 9 is described above, controls the action of booster circuit 4, inverter circuit 5, grid-connected relay 7 and independent operation relay 8.Control circuit 9 when inverter circuit 5 is connected with commercial electric power system 3 carry out interconnection running, connect grid-connected with relay 7, and independent operation used relay off-the-line.In addition, independent operation relay, when carrying out independent operation, by grid-connected relay 7 off-the-line, and connects by control circuit 9.
Control circuit 9 makes booster circuit 4 perform MPPT action, makes the output power of solar cell become maximum.MPPT action carries out computing by the input voltage vin of the input current Iin and booster circuit that utilize booster circuit to electric power Pn, and the step-up ratio adjusting booster circuit makes electric power Pn become maximum carries out.
Control circuit 9, when carrying out interconnection running and when carrying out independent operation, can change the action of inverter circuit 5.Control circuit 9 is when carrying out interconnection running, for inverter circuit 5, control to make each switch element 53 ~ 56 periodically conduction and cut-off according to PWM (Pulse Width Modulation), and the DC power conversion exported from solar cell is become three-phase alternating current.Thus, the three-phase alternating current after conversion is outputted to 3 output lines Lu, Lv, Lw by inverter circuit 5.
The PWM carrying out interconnecting under working order controls to be undertaken by following Current Control: be more positioned at the electric current (hereinafter referred to as U phase line current Iu) of the U phase line Lu of rear class than filter circuit 6 to flowing through and flow through the electric current (hereinafter referred to as W phase line current Iw) being more positioned at the W phase line Lu of rear class than filter circuit 6 and detect, allowing line current Iu, Iw become desired value Iut, Iwt respectively.Specifically, the switch timing of the switch element 53,54 of Bridge 1 arm circuit decides based on line current Iu, and the switch timing of the switch element 55,56 of Bridge 2 arm circuit decides based on line current Iw.That is, control circuit 9 is made command value Iut, Iwt to each bridge arm circuit each, and controls the switch timing of the switch element of each bridge arm circuit.
Control circuit 9 is when carrying out independent operation, for inverter circuit 5, control to make each switch element 51 ~ 54 periodically conduction and cut-off according to PWM (Pulse Width Modulation), and the DC power conversion exported from solar cell is become single-phase alternating current.Thus, the single-phase alternating current after conversion is outputted to U phase line Lu and W phase line Lw by inverter circuit 5.
PWM when carrying out independent operation controls, undertaken by following voltage control: the voltage V (or wiring voltage between La, Lb) being applied to the U phase line Lu and W phase line Lw that are more positioned at rear class than filter circuit 6 is detected, allows this voltage V become desired value Vt.Specifically, the switch timing of the switch element 53,54 of Bridge 1 arm circuit and the switch element 55,56 of Bridge 2 arm circuit decides based on voltage V.That is, control circuit 9 to two the 1st, Bridge 2 arm circuit is made common command value Vt, and to two the 1st, the switch timing of the switch element of Bridge 2 arm circuit controls.
As mentioned above, according to the 1st execution mode, when independent operation and non-supply three-phase alternating current but supply single-phase alternating current, therefore, it is possible to easily utilize the load worked under single-phase alternating current.
In addition, passing through semi-bridge type three-phase inverter circuitry, when carrying out independent operation, if generation three-phase alternating current, and come load supply electric power from each cross streams electricity extraction single-phase alternating current, then with each load of being connected mutually and in unbalanced situation, the balance of voltage collapse of capacitor 51,52 and become and supply electric power (that is, the load of connection is very limited) without normal load.But, in the 1st embodiment, when carrying out independent operation, owing to performing an action as bridge-type single-phase inverter circuit, can without the need to performing an action with taking notice of the balance of voltage of capacitor 51,52, therefore, it is possible to utilize various load.
In addition, in the 1st execution mode, the example relay of the contact chip with open and close type being used for grid-connected relay 7 and independent operation relay 8 is illustrated, but also can uses 1 relay with the contact chip of suitching type carrying out switching selected in multiple outgoing route.Fig. 2 is the figure of connection when representing the suitching type relay 70 employing the contact chip with suitching type.Suitching type relay 70 shown in Fig. 2 has the contact chip of 3 suitching types.Suitching type relay 70 is undertaken connecting thus switching outgoing route by selecting 1 in the input side contact of each contact chip and 2 outlet side contacts corresponding with each input side contact.
Each input side contact of suitching type relay 70 is connected with each output line Lu, Lw, Lv, and the side in 2 outlet side contacts is connected with output line Lu, Lw, Lv of being connected to commercial electric power system 3 respectively.In addition, the opposing party in 2 outlet side contacts, is connected with wiring La, the Lb being connected to load 10, can be switched the supply target of the alternating current after being converted by inverter circuit 5 by the linking objective of the contact chip to suitching type relay 70.Specifically, wiring La, Lb are connected with the outlet side contact being connected to output line Lu, Lw, and the outlet side contact be connected with output line Lv is not connected whatever and is in open-circuit condition.When independent operation, from the 1st, Bridge 2 arm circuit output line Lu, Lw of being connected supply alternating current to connect up La, Lb.
Suitching type relay 70 pairs of contact chips switch, making when carrying out interconnection running, inverter circuit 5 to be connected with commercial electric power system 3, not carrying out when carrying out the situation etc. of independent operation interconnection operates, inverter circuit 5 being connected with load 10.Suitching type relay 70 is between output line Lu, Lv, Lw and connect up between La, Lb, doubles as grid-connected relay and independent operation relay.
Relay 71 has the contact chip of 3 open and close types, and these 3 contact chips are situated between and are output line Lu, Lv, Lw.Relay 71 is for disconnecting grid-connecting apparatus 2 and commercial electric power system 3 and load 10.Relay 71 when inverter circuit 5 works (comprise interconnection running time and independent operation time) make output line Lu, Lv, Lw become connection status, make output line Lu, Lv, Lw become open-circuit condition when inverter circuit 5 stops.
(the 2nd execution mode)
In the 1st execution mode, semi-bridge type three-phase inverter circuitry is applied to inverter circuit 5, and in the 2nd execution mode, carry out describing to the example of application bridge-type three-phase inverter circuitry.Fig. 3 is the pie graph of the solar power system 100b represented involved by the 2nd execution mode.
In bridge-type three-phase inverter circuitry 5a, replace the series circuit be made up of capacitor 51,52, and the 3rd bridge arm circuit making electricity container 59 and 2 switch elements 57,58 are connected in series.Bridge-type three-phase inverter circuitry 5a, by being connected by these capacitors 59 and the 3rd bridge arm circuit with Bridge 1 arm circuit and Bridge 2 arm circuit in parallel and forming.Now V phase line Lv is connected with the tie point of 2 switch elements 57,58 of the 3rd bridge arm circuit.
The PWM carried out when interconnecting running controls to be undertaken by following Current Control: to U phase line current Iu, W phase line current Iw and flow through the electric current (hereinafter referred to as V phase line current Iv) being more positioned at the V phase line Lv of rear class than filter circuit 6a and detect, and allows line current Iu, Iv, Iw become desired value Iut, Ivt, Iwt respectively.Specifically, the switch timing of the switch element 53,54 of Bridge 1 arm circuit decides based on line current Iu, and the switch timing of Bridge 2 arm circuit decides based on line current Iw, and the switch timing of the 3rd bridge arm circuit decides based on line current Iv.That is, control circuit 9 is made command value Iut, Ivt, Iwt to each bridge arm circuit each, and controls the switch timing of the switch element of each bridge arm circuit.
PWM when carrying out independent operation controls, undertaken by following voltage control: the voltage V (or wiring voltage between La, Lb) being applied to the U phase line Lu and W phase line Lu that are more positioned at rear class than filter circuit 6 is detected, allows this voltage V become desired value Vt.The switch timing of the switch element 53,54 of Bridge 1 arm circuit and the switch element 55,56 of Bridge 2 arm circuit decides based on voltage V, and the switch element 57,58 of the 3rd bridge arm circuit is controlled as cut-off (OFF) state.Namely, control circuit 9 is for 2 bridge arm circuit the (the 1st be connected with output line Lu, Lw line branching out connect up La, Lb, Bridge 2 arm circuit) be made common command value Vt, and to the 1st, the switch timing of the switch element 53 ~ 56 of Bridge 2 arm circuit controls (carrying out PWM control).In addition, the switch element 57,58 of the bridge arm circuit be connected with the output line Lv of the branch of do not connect up La, Lb is ended.
As mentioned above, according to the 2nd execution mode, due to when independent operation and non-supply three-phase alternating current but supply single-phase alternating current, therefore, it is possible to easily utilize the load worked under single-phase alternating current.
In addition, in the 2nd execution mode, also can be set to and branch out wiring Lc, La, Lb respectively from 3 output lines Lu, Lv, Lw, from these 3 wirings, select 2 wirings to be connected to load, and to load supply single-phase alternating current.Even if essence is also like this, 2 output lines in 3 output lines carry out branch respectively.Fig. 4 is the figure of the connection represented for selecting 2 selection circuits connected up 80.
As shown in Figure 4, selection circuit 80 doubles as independent interconnect relay, has 4 contact chips 81 ~ 84.One end of contact chip 81 is connected with wiring La, and the other end is connected with one end of load 10.One end of contact chip 82 is connected with wiring Lc, and the other end is connected with the other end of load 10.One end of contact chip 83 is connected with wiring Lc, and the other end is connected with one end of load 10.One end of contact chip 84 is connected with wiring Lb, and the other end is connected with the other end of load 10.
If closed contact chip 81,82 also opens contact chip 83,84, then from wiring Lc, La, single-phase alternating current can be supplied to load 10, and Bridge 2 arm circuit can be made to stop.In addition, if open contact chip 81,82 and closed contact chip 83,84, from wiring Lc, Lb, single-phase alternating current can be supplied to load 10, and Bridge 1 arm circuit can be made to stop.In addition, if close contact chip 81,84 and open contact chip 82,83, from wiring Lb, La, single-phase alternating current can be supplied to load 10, and the 3rd bridge arm circuit can be made to stop.In addition, if contact chip 81 ~ 84 is all opened, inverter circuit 5 and load 10 can be disconnected.
2 wirings can be selected like this from 3 wirings by being set to, the bridge arm circuit of carrying out work can be selected.Therefore, it is possible to make 1 stopping in the 1st, the 2nd, the 3rd bridge arm circuit.
In addition, if the running number of times of each independent operation or every determined independent operation all changes selected wiring (PWM controls the bridge arm circuit utilized), then switch element 53 ~ 58 can be utilized fifty-fifty.
Above, an execution mode of the present utility model is illustrated, but above explanation is in order to easy understand the utility model, is not intended to limit the utility model.The utility model can carry out when not departing from its purport changing, improveing certainly, and its equivalent is also included in the utility model.
Such as, in the present embodiment, list the example utilizing solar cell 1 as DC power supply, but such as, also can utilize other the DC power supply such as fuel cell or storage battery.
Symbol description
1 solar cell
2 grid-connecting apparatus
3 commercial electric power system
4 booster circuits
5 inverter circuits
6 filter circuits
7 grid-connected relays
8 independent operation relays
9 control circuits
10 loads
Claims (6)
1. a grid-connecting apparatus, is characterized in that, possesses:
Inverter circuit, DC power conversion is become to have the three-phase alternating current of U phase, V phase, W phase by it, and this alternating current is outputted to U phase line, V phase line, these 3 output lines of W phase line;
Grid-connected relay, it is installed on described 3 output lines, and carries out the connection/off-the-line of commercial electric power system and described inverter circuit; With
Wiring, it branches out from 2 output lines described 3 output lines respectively, and is connected with load via independent operation relay,
When described commercial electric power system and described inverter circuit carry out interconnection running, will describedly grid-connectedly to connect with relay, by described independent operation relay off-the-line, described inverter circuit by described three-phase alternating current overlap extremely described commercial electric power system,
When carrying out disconnecting described inverter circuit from described commercial electric power system and supplying the independent operation of electric power to described load, by described grid-connected relay off-the-line, connected by described independent operation relay, described DC power conversion is become single-phase alternating current and outputs to described wiring by described inverter circuit.
2. grid-connecting apparatus according to claim 1, is characterized in that,
Described commercial electric power system is the power-supply system of the V wiring that V phase is grounded,
Described inverter circuit, is connected in parallel forms being connected in series with the Bridge 1 arm circuit of 2 switch elements, the Bridge 2 arm circuit being connected in series with 2 switch elements and the series circuit that is connected in series with 2 capacitors,
The tie point of 2 switch elements of described Bridge 1 arm circuit is connected with described U phase line,
The tie point of 2 switch elements of described Bridge 2 arm circuit is connected with described W phase line,
The tie point of 2 capacitors of described series circuit is connected with described V phase line,
Described wiring branches out from described U phase line and described W phase line.
3. grid-connecting apparatus according to claim 2, is characterized in that,
When carrying out described interconnection running, the switch timing of the switch element of described Bridge 1 arm circuit is decided based on the line current flowing to described U phase line, the switch timing of the switch element of described Bridge 2 arm circuit is decided based on the line current flowing to described W phase line
When carrying out described independent operation, decide the switch timing of the switch element of Bridge 1 arm circuit and the switch element of Bridge 2 arm circuit based on the voltage being applied to described U phase line and W phase line.
4. grid-connecting apparatus according to claim 1, is characterized in that,
Described inverter circuit, is connected in parallel forms being connected in series with the Bridge 1 arm circuit of 2 switch elements, the Bridge 2 arm circuit being connected in series with 2 switch elements and the 3rd bridge arm circuit that is connected in series with 2 switch elements,
The tie point of 2 switch elements of described Bridge 1 arm circuit is connected with described U phase line,
The tie point of 2 switch elements of described Bridge 2 arm circuit is connected with described W phase line,
The tie point of 2 switch elements of described 3rd bridge arm circuit is connected with described V phase line,
When carrying out described independent operation, the switch element of the described bridge arm circuit be connected with the output line of the branch not having described wiring is ended, and PWM control is carried out to the switch element of the described bridge arm circuit be connected with the output line branching out described wiring and described single-phase alternating current is supplied to described wiring.
5. grid-connecting apparatus according to claim 4, is characterized in that,
Possess selection circuit, this selection circuit branches out wiring respectively from described 3 output lines, and from 3 described wirings, selects described 2 be connected to load.
6. grid-connecting apparatus according to claim 5, is characterized in that,
The running number of times of each described independent operation or every determined described independent operation, all changes by the wiring selected by described selection circuit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-259816 | 2011-11-29 | ||
| JP2011259816 | 2011-11-29 | ||
| PCT/JP2012/080283 WO2013080877A1 (en) | 2011-11-29 | 2012-11-22 | Grid connection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204046188U true CN204046188U (en) | 2014-12-24 |
Family
ID=48535336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201290001017.3U Expired - Fee Related CN204046188U (en) | 2011-11-29 | 2012-11-22 | Grid-connecting apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5887501B2 (en) |
| CN (1) | CN204046188U (en) |
| WO (1) | WO2013080877A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107302315A (en) * | 2016-04-15 | 2017-10-27 | Ls 产电株式会社 | Equipment for controlling Solar lamp voltage |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6080210B2 (en) * | 2013-07-26 | 2017-02-15 | シャープ株式会社 | Power converter |
| CN103560511B (en) * | 2013-11-15 | 2016-08-17 | 北京国电通网络技术有限公司 | Off-grid grid-connected integrated solar power generation subsystem and system |
| DE102014104216B3 (en) * | 2014-03-26 | 2015-06-11 | Sma Solar Technology Ag | Single-phase emergency operation of a three-phase inverter and corresponding inverter |
| WO2015170143A1 (en) * | 2014-05-08 | 2015-11-12 | Abb Technology Ag | Configurable inverter apparatus, photovoltaic system comprising such an inverter apparatus |
| JP6881002B2 (en) * | 2017-05-09 | 2021-06-02 | 住友電気工業株式会社 | Power converter and power conversion system |
| JP7011168B2 (en) * | 2018-04-25 | 2022-01-26 | シンフォニアテクノロジー株式会社 | Power supply circuit and parts feeder equipped with it |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003018859A (en) * | 2001-06-27 | 2003-01-17 | Japan Storage Battery Co Ltd | Power conditioner for solar power generation |
| JP2003116222A (en) * | 2001-10-04 | 2003-04-18 | Nissin Electric Co Ltd | Self-sustaining control method for distributed power supply device |
-
2012
- 2012-11-22 CN CN201290001017.3U patent/CN204046188U/en not_active Expired - Fee Related
- 2012-11-22 WO PCT/JP2012/080283 patent/WO2013080877A1/en active Application Filing
- 2012-11-22 JP JP2013547119A patent/JP5887501B2/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107302315A (en) * | 2016-04-15 | 2017-10-27 | Ls 产电株式会社 | Equipment for controlling Solar lamp voltage |
| CN107302315B (en) * | 2016-04-15 | 2020-02-21 | Ls 产电株式会社 | Apparatus for controlling voltage of solar lamp |
| US10651729B2 (en) | 2016-04-15 | 2020-05-12 | Lsis Co., Ltd. | Apparatus for controlling solar light voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2013080877A1 (en) | 2015-04-27 |
| WO2013080877A1 (en) | 2013-06-06 |
| JP5887501B2 (en) | 2016-03-16 |
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