CN103138383B - Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method - Google Patents

Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method Download PDF

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CN103138383B
CN103138383B CN201310061604.2A CN201310061604A CN103138383B CN 103138383 B CN103138383 B CN 103138383B CN 201310061604 A CN201310061604 A CN 201310061604A CN 103138383 B CN103138383 B CN 103138383B
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stabilizing didoe
voltage stabilizing
electric capacity
diode
connects
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CN103138383A (en
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张斌
张博温
张东来
张华�
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Shenzhen Academy of Aerospace Technology
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Shenzhen Academy of Aerospace Technology
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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
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The invention relates to a photovoltaic (pv) grid-connection inverter low-voltage ride-through auxiliary power supply device and a method, and the device includes an alternative current electricity-taking circuit, a direct current electricity-taking circuit and a delay deenergizing circuit. Aiming at the defect that the electricity-taking time of the direct current bus is very short, the part of the circuit is in a way of simulating power supply, the circuit structure is simple, and the cost is reduced. Meanwhile, the active close of an auxiliary source is in a way of delay closing, and a comparator and a digital controller are unnecessary to participate in the process, so that no extra low-voltage auxiliary power supply is necessary; the photovoltaic (pv) grid-connection inverter low-voltage ride-through auxiliary power supply device is simple in structure, precision in timing and high in reliability, guarantees reliable work of the ride-through function of the low-voltage inverter, and further reduces the product cost.

Description

A kind of photovoltaic combining inverter low voltage crossing auxiliary power supply and method
Technical field
The present invention relates to a kind of photovoltaic combining inverter, auxiliary power supply and method are provided when particularly relating to a kind of photovoltaic combining inverter low voltage crossing.
Background technology
In parallel network power generation process, particularly in large-sized photovoltaic power station, photovoltaic DC-to-AC converter should possess low voltage ride-through capability, avoid departing from when line voltage is abnormal, cause the instability of electric network source, namely, when electric network fault or disturbance cause the Voltage Drop of also site, in the scope of Voltage Drop, photovoltaic generation unit can uninterruptedly be incorporated into the power networks.When inverter ac side voltage falls to 20% nominal voltage, inverter can ensure the 1s that is uninterruptedly incorporated into the power networks; Inverter ac side voltage can return to 90% of nominal voltage after falling in 3s time, inverter can ensure uninterruptedly to be incorporated into the power networks.To the inverter do not cut out during electric power system fault, its active power should quick-recovery soon after fault clearance, from the fault clearance moment, returns to the value before fault with the power variation rate of at least 10% rated power/second.In low voltage crossing process, inverter should provide dynamic reactive to support
In low voltage crossing process, inverter internal power supply needs to run without interruption, to guarantee the reliability service of system equally.Be applied in photovoltaic combining inverter the auxiliary source with low voltage ride-through capability at present and usually adopt alternating current-direct current way to take power simultaneously, namely when AC Voltage Drop, from the power taking of photovoltaic component DC bus, although this scheme meets basic functional requirement, but still have the following disadvantages:
(1) cost is higher: for realizing the power taking of DC bus high pressure, and usually adopt Switching Power Supply mode to change, circuit is complicated, and DC bus way to take power is as standby functions, and utilance is extremely low, and overall cost is higher;
(2) do not possess reliable turn-off function: during electric network fault, DC bus drops to when auxiliary source cannot normally work and does not carry out respective handling, and the inverter power supply caused thus is unstable, brings very big hidden danger may to whole electricity generation system.
Summary of the invention
The technical problem that the present invention solves is: provide a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply and method, overcome prior art and do not possess reliable turn-off function with the technical problem having cost high.
Technical scheme of the present invention is: build a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply, comprise interchange power-supply circuit, direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises electric capacity C1, electric capacity C2, voltage stabilizing didoe D3, voltage stabilizing didoe D4, voltage stabilizing didoe D2, voltage stabilizing didoe D11, discharge resistance R4, rectifier diode D1, current-limiting resistance R3, photoelectrical coupler U1, discharge resistance R2, power-supply circuit is exchanged described in a termination after described rectifier diode D1 connects with current-limiting resistance R3, the other end of current-limiting resistance R3 described in a termination after described electric capacity C1 is in parallel with described discharge resistance R4, the positive pole of described voltage stabilizing didoe D3, the collector electrode of phototriode in the negative pole of described voltage stabilizing didoe D2 and described photoelectrical coupler U1, in described photoelectrical coupler U1, the emitter of phototriode meets described discharge resistance R2, the negative pole of described voltage stabilizing didoe D11 is connected in series the positive pole of described voltage stabilizing didoe D2, other end ground connection after described electric capacity C1 is in parallel with described discharge resistance R4, the plus earth of described voltage stabilizing didoe D11, described voltage stabilizing didoe D3 negative pole is connected in series the positive pole of described voltage stabilizing didoe D4, the negative pole of described voltage stabilizing didoe D4 connects one end of described electric capacity C2, one end of described electric capacity C2 also connects the positive pole of diode in described photoelectrical coupler U1, described electric capacity C2 other end ground connection, in described photoelectrical coupler U1, the negative pole of diode connects the negative pole of described voltage stabilizing didoe D3 and the positive pole of described voltage stabilizing didoe D4.
Further technical scheme of the present invention is: described interchange power-supply circuit comprises ac bus, full-bridge rectifier D9, fuse F1, diode D10, filter capacitor C5 and filter capacitor C6, described ac bus connects described full-bridge rectifier D9, the positive pole that described full-bridge rectifier D9 exports connects one end of fuse F1, the positive pole of diode D10 described in another termination of described fuse F1, the negative pole of diode D10 described in filter capacitor C5 in parallel and a termination of filter capacitor C6 output voltage, the negative pole that described full-bridge rectifier D9 exports is connect after filter capacitor C5 in parallel and the other end of filter capacitor C6.
Further technical scheme of the present invention is: described direct current power-supply circuit comprises DC bus, current-limiting resistance R1, N-channel MOS pipe Q1, voltage stabilizing didoe pipe D5, diode D6 is filled with in counnter attack, diode D8, filter capacitor C4, filter capacitor C3, the positive pole of described DC bus connects the drain electrode of described metal-oxide-semiconductor Q1 after described current-limiting resistance R1, the source electrode of described metal-oxide-semiconductor Q1 connects described anti-filling diode D6 negative pole, one end of filter capacitor C3, the grid of described metal-oxide-semiconductor Q1 connects the negative pole of voltage stabilizing didoe pipe D5, the positive pole of described voltage stabilizing didoe pipe D5 connects anti-filling diode D6 positive pole, the negative pole of described diode D8 connects one end of described filter capacitor C4, the other end of described filter capacitor C3 is connected rear ground connection with the other end of described filter capacitor C4.
Further technical scheme of the present invention is: described time delayed turn-off circuit also comprises rectifier diode D1 and resistance R3, and described interchange power-supply circuit is charged to electric capacity C1 by described rectifier diode D1 and described resistance R3.
Further technical scheme of the present invention is: described electric capacity C1 is slowly discharged by discharge resistance R4 after the voltage of ac bus reduces or disappears, and by photoelectrical coupler U1 and discharge resistance R2 repid discharge.
Further technical scheme of the present invention is: described direct current power-supply circuit comprises voltage stabilizing didoe D7, and the positive pole of described voltage stabilizing didoe D7 connects the positive pole of described diode D8, and the negative pole of described voltage stabilizing didoe D7 connects one end of electric capacity C3 and the source electrode of described metal-oxide-semiconductor Q1.
Technical scheme of the present invention is: provide a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply method, adopt photovoltaic combining inverter low voltage crossing auxiliary power supply of the present invention, described device comprises interchange power-supply circuit, direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises charging capacitor C1, discharge resistance R2, current-limiting resistance R3, discharge resistance R4, and described auxiliary power supply method comprises the steps:
During electrical network normal power supply, described interchange power-supply circuit surveys ac bus power taking from interchange, and meanwhile, described charging capacitor C1, charging capacitor C2 bulk charge are saturated, and time delayed turn-off circuit is in stable state;
When mains supply interrupts, direct current power-supply circuit is from the DC bus power taking of DC side, simultaneously, described charging capacitor C1 and charging capacitor C2 is slowly discharged by described discharge resistance R4, after reaching setting-up time, described charging capacitor C1 and charging capacitor C2 is by photoelectrical coupler U1 and discharge resistance R2 repid discharge to zero level, and auxiliary source exports closes;
During power system restoration, described interchange power-supply circuit is from the power taking of AC ac bus, and auxiliary source normally exports, and charge to saturated by described current-limiting resistance R3 to described charging capacitor C1 and charging capacitor C2, described time delayed turn-off circuit enters stable state again simultaneously.
Technique effect of the present invention is: build a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply and method, comprise and exchange power-supply circuit, direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises charging capacitor C1, discharge resistance R4.During electrical network normal power supply, described interchange power-supply circuit surveys ac bus power taking from interchange, and meanwhile, described charging capacitor C1 charges, and maintains the voltage stabilization of described time delayed turn-off circuit.When mains supply interrupts, direct current power-supply circuit is from the DC bus power taking of DC side, and described charging capacitor C1 is slowly discharged by described discharge resistance R4, and when being discharged to zero level, output voltage is closed.During power system restoration, described charging capacitor C1 charges, and described interchange power-supply circuit is from the power taking of AC ac bus, and output voltage progressively restores electricity.When the present invention is directed to DC bus power taking in this application, compole is short, and this partial circuit adopts analog power mode, and circuit structure is simple, reduces costs.Simultaneously, auxiliary source of the present invention is initiatively closed and is adopted time-delay closing mode, and this process is without the need to the participation such as comparator and digitial controller, therefore also just without the need to extra low-voltage accessory power supply, structure is simple, and timing is accurate, and reliability is high, ensure that the reliably working of inverter low voltage ride-through function, also reduce further product cost.
Accompanying drawing explanation
Fig. 1 is low voltage crossing auxiliary source application principle figure of the present invention.
Fig. 2 is low voltage crossing auxiliary source structure chart of the present invention.
Fig. 3 is low voltage crossing auxiliary source simulation waveform figure of the present invention.
Embodiment
Below in conjunction with specific embodiment, technical solution of the present invention is further illustrated.
As shown in Figure 1, the specific embodiment of the present invention is: when grid side is normal, and auxiliary source of the present invention is from the 220VAC power taking of AC, when electrical network is abnormal, from photovoltaic array DC bus 400V ~ 850VDC power taking, stable output is 220VDC, is supplied to other DC/DC module and electric equipments.When the type that electric network fault is low voltage crossing defined, auxiliary source after power system restoration again from AC network power taking, and when electric network fault exceeds the recovery time that low voltage crossing specifies, auxiliary source initiatively will close power supply after inverter control system completes off-grid action, rework after waiting for power system restoration.
As Fig. 1, shown in Fig. 2, the specific embodiment of the present invention is: build a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply, comprise interchange power-supply circuit, direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises electric capacity C1, electric capacity C2, voltage stabilizing didoe D3, voltage stabilizing didoe D4, voltage stabilizing didoe D2, voltage stabilizing didoe D11, discharge resistance R4, rectifier diode D1, current-limiting resistance R3, photoelectrical coupler U1, discharge resistance R2, power-supply circuit is exchanged described in a termination after described rectifier diode D1 connects with current-limiting resistance R3, the other end of current-limiting resistance R3 described in a termination after described electric capacity C1 is in parallel with described discharge resistance R4, the positive pole of described voltage stabilizing didoe D3, the collector electrode of phototriode in the negative pole of described voltage stabilizing didoe D2 and described photoelectrical coupler U1, in described photoelectrical coupler U1, the emitter of phototriode meets described discharge resistance R2, the negative pole of described voltage stabilizing didoe D11 is connected in series the positive pole of described voltage stabilizing didoe D2, other end ground connection after described electric capacity C1 is in parallel with described discharge resistance R4, the plus earth of described voltage stabilizing didoe D11, described voltage stabilizing didoe D3 negative pole is connected in series the positive pole of described voltage stabilizing didoe D4, the negative pole of described voltage stabilizing didoe D4 connects one end of described electric capacity C2, one end of described electric capacity C2 also connects the positive pole of diode in described photoelectrical coupler U1, described electric capacity C2 other end ground connection, in described photoelectrical coupler U1, the negative pole of diode connects the negative pole of described voltage stabilizing didoe D3 and the positive pole of described voltage stabilizing didoe D4.Described electric capacity C1 is slowly discharged by R4 after ac bus disappears, and by U1 and R2 repid discharge.
As shown in Figure 2, specific works process of the present invention is as follows: at electrical network under normal circumstances, P1 point voltage is charged to electric capacity C1 by D1 and R3, by voltage stabilizing didoe D3 and voltage stabilizing didoe D4, electric capacity C2 is charged simultaneously, voltage stabilizing didoe D2 connects with voltage stabilizing didoe D11 and forms the DC level of 225VDC, determines P2, P3 and P4 level point thus and is 225V direct current.When electrical network is abnormal, the voltage of ac bus reduces or disappears, electric capacity C1 is slowly discharged by discharge resistance R4, P2 level point progressively reduces, and P4 level point does not change, and when P2 level point is lower than P4 level point, specifically low voltage number is determined by D3, in the present embodiment, when P2 level point lower than P4 level point lower than 20V time, voltage stabilizing didoe D3 conducting, electric capacity C2 is by the light-emitting diode of photoelectrical coupler U1 inside, voltage stabilizing didoe D3 and voltage stabilizing didoe D4 discharges, now once form discharging current, the phototriode conducting of photoelectrical coupler U1, electric capacity C1 and electric capacity C2 carries out repid discharge by resistance R2, and electric capacity C2 discharging current increases, make the phototriode conduction impedance of photoelectrical coupler U1 less further, form positive feedback, electric capacity C1 and electric capacity C2 discharges completely in very short time, P4 level point is reduced to 0VDC, metal-oxide-semiconductor Q1 turns off, achieve the closedown of DC bus power-supply circuit.In this circuit arrangement visible, determine that the device of time delayed turn-off is C1, R4 and D3, therefore by this type of device of adjustment and size, can realize the timing of different time length, structure is simple, and reliability is high.
As shown in Figure 2, the preferred embodiment of the present invention is: described interchange power-supply circuit comprises ac bus, full-bridge rectifier D9, fuse F1, diode D10, filter capacitor C5 and filter capacitor C6, described ac bus connects described full-bridge rectifier D9, the positive pole that described full-bridge rectifier D9 exports connects one end of fuse F1, the positive pole of diode D10 described in another termination of described fuse F1, the negative pole of diode D10 described in filter capacitor C5 in parallel and a termination of filter capacitor C6 output voltage, the negative pole that described full-bridge rectifier D9 exports is connect after filter capacitor C5 in parallel and the other end of filter capacitor C6.Specific works process is as follows: ac bus 220VAC becomes direct current by full-bridge rectifier D9, F1 is fuse, after parallel diode D10, filter capacitor C5 and filter capacitor C6, about 250VDC is exported at P6 point, due to uncontrollable rectifier, this output level is relevant with filter capacitor C6 with filter capacitor C5 to load, therefore according to different loads, and can by output voltage stabilization at required level by adjustment filter capacitor.
As shown in Figure 2, the preferred embodiment of the present invention is: described direct current power-supply circuit comprises DC bus, current-limiting resistance R1, N-channel MOS pipe Q1, voltage stabilizing didoe pipe D5, diode D6 is filled with in counnter attack, diode D8, filter capacitor C4, filter capacitor C3, the positive pole of described DC bus connects the drain electrode of described metal-oxide-semiconductor Q1 after described current-limiting resistance R1, the source electrode of described metal-oxide-semiconductor Q1 connects described anti-filling diode D6 negative pole, one end of filter capacitor C3, the grid of described metal-oxide-semiconductor Q1 connects the negative pole of voltage stabilizing didoe pipe D5, the positive pole of described voltage stabilizing didoe pipe D5 connects anti-filling diode D6 positive pole, the negative pole of described diode D8 connects one end of described filter capacitor C4, the other end of described filter capacitor C3 is connected rear ground connection with the other end of described filter capacitor C4.In specific embodiment, described direct current power-supply circuit comprises voltage stabilizing didoe D7, and the positive pole of described voltage stabilizing didoe D7 connects the positive pole of described diode D8, and the negative pole of described voltage stabilizing didoe D7 connects one end of electric capacity C3 and the source electrode of described metal-oxide-semiconductor Q1.Specific works process is as follows: DC bus carries out linear voltage adjustment by current-limiting resistance R1 and metal-oxide-semiconductor Q1, output voltage is determined by P4 point voltage, designing P4 point voltage is in the present invention 225VDC, and filling with diode D6 clamper P5 level point by voltage stabilizing didoe D5 and counnter attack is 221VDC.P5 is 200VDC by level after voltage stabilizing didoe D7, parallel diode D8 and filter capacitor C4, and realize parallel connection with the output exchanging power-supply circuit, because direct current power-supply circuit output voltage is 200VDC, lower than the 250VDC exchanging power-supply circuit output, therefore at electrical network under normal circumstances, under the effect of parallel diode, DC bus no-output, after voltage stabilizing didoe D7 ensure that direct current power-supply circuit is closed simultaneously, filter capacitor C3 also can not slowly discharge if any remaining capacity, improves the stability of a system and auxiliary source efficiency.
Technical scheme of the present invention is: provide a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply method, adopt photovoltaic combining inverter low voltage crossing auxiliary power supply of the present invention, described device comprises interchange power-supply circuit, direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises charging capacitor C1, discharge resistance R2, current-limiting resistance R3, discharge resistance R4, and described auxiliary power supply method comprises the steps:
During electrical network normal power supply, described interchange power-supply circuit surveys ac bus power taking from interchange, and meanwhile, described charging capacitor C1, charging capacitor C2 bulk charge are saturated, and time delayed turn-off circuit is in stable state;
When mains supply interrupts, direct current power-supply circuit is from the DC bus power taking of DC side, simultaneously, described charging capacitor C1 and charging capacitor C2 is slowly discharged by described discharge resistance R4, after reaching setting-up time, described charging capacitor C1 and charging capacitor C2 is by photoelectrical coupler U1 and discharge resistance R2 repid discharge to zero level, and auxiliary source exports closes;
During power system restoration, described interchange power-supply circuit is from the power taking of AC ac bus, and auxiliary source normally exports, and charge to saturated by described current-limiting resistance R3 to described charging capacitor C1 and charging capacitor C2, described time delayed turn-off circuit enters stable state again simultaneously.
As shown in Figure 3, specific works process is as follows:
A. in T1 period, electrical network is normal, and auxiliary source measures electricity from interchange, and be that C1 and C2 in auxiliary source charges, the voltage of P2 and P4 was progressively stablized in this stage simultaneously;
B. in T2 period, grid disruption, auxiliary source is from DC bus power taking, and C1 is slowly discharged by R4, and P2 point voltage also progressively reduces, and P4 point voltage remains unchanged;
C. in T3 period, P2 point voltage is reduced to set point, D3 conducting, triggers U1 work simultaneously, and C1 and C2 passes through R2 repid discharge to zero level, and now auxiliary source output voltage P6 closes,
D. in T4 period, power system restoration, in auxiliary source, C1 and C2 charges again, and P2 and P4 voltage progressively recovers;
E. in T5 period, electrical network normally works, and auxiliary source enters stable state, and ac bus provides energy for output voltage P6.
By above-mentioned emulation, the auxiliary source resolution circuitry demonstrating the present invention's proposition is succinct, and reliable operation, can meet photovoltaic combining inverter low voltage crossing process to the requirement of power supply, also reduce product cost simultaneously, enhance system reliability.
Technique effect of the present invention is: build a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply and method, comprise and exchange power-supply circuit, direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises charging capacitor C1, discharge resistance R4.During electrical network normal power supply, described interchange power-supply circuit surveys ac bus power taking from interchange, and meanwhile, described charging capacitor C1 charges, and maintains the voltage stabilization of described time delayed turn-off circuit.When mains supply interrupts, direct current power-supply circuit is from the DC bus power taking of DC side, and described charging capacitor C1 is slowly discharged by described discharge resistance R4, and when being discharged to zero level, output voltage is closed.During power system restoration, described charging capacitor C1 charges, and described interchange power-supply circuit is from the power taking of AC ac bus, and output voltage progressively restores electricity.The present invention is without the need to extra low-voltage accessory power supply, and structure is simple, and timing is accurate, and reliability is high, ensure that the reliably working of inverter low voltage ride-through function, also reduce further product cost.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.

Claims (5)

1. a photovoltaic combining inverter low voltage crossing auxiliary power supply, it is characterized in that, comprise interchange power-supply circuit, direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises electric capacity C1, electric capacity C2, voltage stabilizing didoe D3, voltage stabilizing didoe D4, voltage stabilizing didoe D2, voltage stabilizing didoe D11, discharge resistance R4, rectifier diode D1, current-limiting resistance R3, photoelectrical coupler U1, discharge resistance R2, power-supply circuit is exchanged described in a termination after described rectifier diode D1 connects with current-limiting resistance R3, the other end of current-limiting resistance R3 described in a termination after described electric capacity C1 is in parallel with described discharge resistance R4, the positive pole of described voltage stabilizing didoe D3, the collector electrode of phototriode in the negative pole of described voltage stabilizing didoe D2 and described photoelectrical coupler U1, in described photoelectrical coupler U1, the emitter of phototriode meets described discharge resistance R2, the negative pole of described voltage stabilizing didoe D11 is connected in series the positive pole of described voltage stabilizing didoe D2, other end ground connection after described electric capacity C1 is in parallel with described discharge resistance R4, the plus earth of described voltage stabilizing didoe D11, described voltage stabilizing didoe D3 negative pole is connected in series the positive pole of described voltage stabilizing didoe D4, the negative pole of described voltage stabilizing didoe D4 connects one end of described electric capacity C2, one end of described electric capacity C2 also connects the positive pole of diode in described photoelectrical coupler U1, described electric capacity C2 other end ground connection, in described photoelectrical coupler U1, the negative pole of diode connects the negative pole of described voltage stabilizing didoe D3 and the positive pole of described voltage stabilizing didoe D4, described direct current power-supply circuit comprises DC bus, current-limiting resistance R1, N-channel MOS pipe Q1, voltage stabilizing didoe D5, voltage stabilizing didoe D7, diode D6 is filled with in counnter attack, diode D8, filter capacitor C4, filter capacitor C3, the positive pole of described DC bus connects the drain electrode of described metal-oxide-semiconductor Q1 after described current-limiting resistance R1, the source electrode of described metal-oxide-semiconductor Q1 connects described anti-filling diode D6 negative pole, one end of filter capacitor C3, the grid of described metal-oxide-semiconductor Q1 connects the negative pole of voltage stabilizing didoe D5, the positive pole of described voltage stabilizing didoe D5 connects anti-filling diode D6 positive pole, the negative pole of described diode D8 connects one end of described filter capacitor C4, the other end of described filter capacitor C3 is connected rear ground connection with the other end of described filter capacitor C4, the positive pole of described voltage stabilizing didoe D7 connects the positive pole of described diode D8, the negative pole of described voltage stabilizing didoe D7 connects one end of electric capacity C3 and the source electrode of described metal-oxide-semiconductor Q1.
2. photovoltaic combining inverter low voltage crossing auxiliary power supply according to claim 1, it is characterized in that, described interchange power-supply circuit comprises ac bus, full-bridge rectifier D9, fuse F1, diode D10, filter capacitor C5 and filter capacitor C6, described ac bus connects described full-bridge rectifier D9, the positive pole that described full-bridge rectifier D9 exports connects one end of fuse F1, the positive pole of diode D10 described in another termination of described fuse F1, the negative pole of diode D10 described in filter capacitor C5 in parallel and a termination of filter capacitor C6 output voltage, the negative pole that described full-bridge rectifier D9 exports is connect after filter capacitor C5 in parallel and the other end of filter capacitor C6.
3. photovoltaic combining inverter low voltage crossing auxiliary power supply according to claim 1, it is characterized in that, described time delayed turn-off circuit also comprises rectifier diode D1 and resistance R3, and described interchange power-supply circuit is charged to electric capacity C1 by described rectifier diode D1 and described resistance R3.
4. photovoltaic combining inverter low voltage crossing auxiliary power supply according to claim 1, it is characterized in that, described electric capacity C1 is slowly discharged by discharge resistance R4 after the voltage of ac bus reduces or disappears, and by photoelectrical coupler U1 and discharge resistance R2 repid discharge.
5. a photovoltaic combining inverter low voltage crossing auxiliary power supply method, adopt photovoltaic combining inverter low voltage crossing auxiliary power supply as claimed in claim 1, it is characterized in that, described auxiliary power supply method comprises the steps:
During electrical network normal power supply, described interchange power-supply circuit surveys ac bus power taking from interchange, and meanwhile, described electric capacity C1, electric capacity C2 bulk charge are saturated, and time delayed turn-off circuit is in stable state;
When mains supply interrupts, direct current power-supply circuit is from the DC bus power taking of DC side, simultaneously, described electric capacity C1 and electric capacity C2 is slowly discharged by described discharge resistance R4, after reaching setting-up time, described electric capacity C1 and electric capacity C2 is by photoelectrical coupler U1 and discharge resistance R2 repid discharge to zero level, and auxiliary source exports closes;
During power system restoration, described interchange power-supply circuit is from the power taking of AC ac bus, and auxiliary source normally exports, and charge to saturated by described current-limiting resistance R3 to described electric capacity C1 and electric capacity C2, described time delayed turn-off circuit enters stable state again simultaneously.
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