CN103138383A - 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 PDFInfo
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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
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
Technical field
The present invention relates to a kind of photovoltaic combining inverter, relate in particular to a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply and method.
Background technology
In the parallel network power generation process, particularly in the large-sized photovoltaic power station, photovoltaic DC-to-AC converter should possess low voltage ride-through capability, avoid breaking away from when line voltage is abnormal, cause the unstable of electric network source, namely cause and the voltage of site when falling when electric network fault or disturbance, in the scope that voltage falls, the photovoltaic generation unit can uninterruptedly be incorporated into the power networks.When inverter AC voltage fell to 20% nominal voltage, inverter can guarantee the 1s that uninterruptedly is incorporated into the power networks; Inverter AC voltage can return in 3s after falling nominal voltage 90% the time, inverter can guarantee uninterruptedly to be incorporated into the power networks.To the inverter that does not cut out during electric power system fault, its active power quick-recovery soon after fault clearance from fault clearance constantly, returns to value before fault with the power variation rate of at least 10% rated power/second.In the low voltage crossing process, inverter should provide dynamic reactive to support
In the low voltage crossing process, the inverter internal power supply needs to run without interruption equally, to guarantee the reliability service of system.Be applied at present the auxiliary source that has low voltage ride-through capability in photovoltaic combining inverter and usually adopt alternating current-direct current way to take power simultaneously, namely when AC voltage falls, from the power taking of photovoltaic component DC bus, although this scheme has satisfied basic functional requirement, but still have the following disadvantages:
(1) cost is higher: for realizing the power taking of dc bus high pressure, usually adopt the Switching Power Supply mode to change, circuit is complicated, and the dc bus way to take power is as standby functions, and utilance is extremely low, and overall cost is higher;
(2) do not possess the reliable turn-off function: during electric network fault, do not carry out respective handling when dc bus drops to auxiliary source and can't work, the inverter power supply that causes thus is unstable, bring very big hidden danger may for whole electricity generation system.
Summary of the invention
The technical problem that the present invention solves is: a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply and method are provided, overcome prior art and do not possess the reliable turn-off function so that the high technical problem of cost to be arranged.
technical scheme of the present invention is: build a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply, comprise the interchange power-supply circuit, the direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises capacitor C 1, capacitor C 2, 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, described rectifier diode D1 and the rear described power-supply circuit that exchanges of a termination of current-limiting resistance R3 series connection, the other end of described capacitor C 1 and a described current-limiting resistance R3 of termination after described discharge resistance R4 is in parallel, 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 D4 is connected in series the positive pole of described voltage stabilizing didoe D2, the positive pole of described capacitor C 1 and the described voltage stabilizing didoe D3 of the other end after described discharge resistance R4 is in parallel, 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 an end of described capacitor C 2, one end of described capacitor C 2 also connects the positive pole of diode in described photoelectrical coupler U1, described capacitor C 2 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 of described full-bridge rectifier D9 output connects the end of fuse F1, the positive pole of the described diode D10 of another termination of described fuse F1, negative pole and the output voltage of filter capacitor C5 in parallel and the described diode D10 of termination of filter capacitor C6, connect the negative pole of described full-bridge rectifier D9 output 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, the end of filter capacitor C3, the grid of described metal-oxide-semiconductor Q1 connects the negative pole of voltage stabilizing didoe pipe D5, it is anodal that the negative pole of described voltage stabilizing didoe pipe D5 meets anti-filling diode D6, the negative pole of described diode D8 connects the end of described filter capacitor C4, ground connection after the other end of described filter capacitor C3 is connected 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 voltage stabilizing didoe D1 and resistance R 3, and described interchange power-supply circuit is by described voltage stabilizing didoe D1 and 1 charging of 3 pairs of capacitor C of described resistance R.
Further technical scheme of the present invention is: described capacitor C 1 is slowly discharged by R4 after ac bus disappears, and can be by U1 and 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 an end of capacitor C 3 and the source electrode of described metal-oxide-semiconductor Q1.
Technical scheme of the present invention is: a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply method is provided, 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, and described auxiliary power supply method comprises the steps:
During the electrical network normal power supply, described interchange power-supply circuit is from exchanging the power taking of test cross stream bus, and simultaneously, 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, the direct current power-supply circuit is from the dc bus power taking of DC side, simultaneously, described charging capacitor C1 and charging capacitor C2 slowly discharge by described discharge resistance R4, after reaching setting-up time, to zero level, auxiliary source output is closed by photoelectrical coupler U1 and discharge resistance R2 repid discharge for described charging capacitor C1 and charging capacitor C2;
During power system restoration, described interchange power-supply circuit is from the power taking of AC ac bus, and auxiliary source is normally exported, and charges to simultaneously saturatedly to described charging capacitor C1 and charging capacitor C2 by described resistance R 3, and described time delayed turn-off circuit enters stable state again.
Technique effect of the present invention is: build a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply and method, comprise exchanging 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 the electrical network normal power supply, described interchange power-supply circuit is from exchanging the power taking of test cross stream bus, and simultaneously, described charging capacitor C1 charges, and keeps the voltage stabilization of described time delayed turn-off circuit.When mains supply interrupted, the direct current power-supply circuit was from the dc bus power taking of DC side, and described charging capacitor C1 slowly discharges by described discharge resistance R4, and when being discharged to zero level, output voltage is closed.During power system restoration, described charging capacitor C1 charging, 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 in this application the dc bus power taking, 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 the time-delay closing mode that adopts, and this process need not the participations such as comparator and digitial controller, therefore also just need not extra low-voltage accessory power supply, simple in structure, timing is accurate, and reliability is high, guarantee the reliably working of inverter low voltage ride-through function, also further reduced product cost.
Description of drawings
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 was normal, auxiliary source of the present invention was from the 220VAC power taking of AC, when electrical network is abnormal, from photovoltaic array dc bus 400V ~ 850VDC power taking, stable be output as 220VDC, offer other DC/DC module and electric equipments.It is the type of low voltage crossing defined when electric network fault, auxiliary source after power system restoration again from the AC network power taking, and work as the recovery time that electric network fault exceeds the low voltage crossing regulation, auxiliary source will initiatively be closed power supply after inverter control system is completed the off-grid action, rework after the wait power system restoration.
as Fig. 1, shown in Figure 2, the specific embodiment of the present invention is: build a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply, comprise the interchange power-supply circuit, the direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises capacitor C 1, capacitor C 2, 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, the described power-supply circuit that exchanges of a termination after described rectifier diode D1 and current-limiting resistance R3 series connection, the other end of described capacitor C 1 and a described current-limiting resistance R3 of termination after described discharge resistance R4 is in parallel, 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 D4 is connected in series the positive pole of described voltage stabilizing didoe D2, the positive pole of described capacitor C 1 and the described voltage stabilizing didoe D3 of the other end after described discharge resistance R4 is in parallel, 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 an end of described capacitor C 2, one end of described capacitor C 2 also connects the positive pole of diode in described photoelectrical coupler U1, described capacitor C 2 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 capacitor C 1 is slowly discharged by R4 after ac bus disappears, and can be 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, the P1 point voltage charges to capacitor C 1 by D1 and R3, by voltage stabilizing didoe D3 and voltage stabilizing didoe D4, capacitor C 2 is charged simultaneously, voltage stabilizing didoe D2 connects with voltage stabilizing didoe D11 and forms the DC level of 225VDC, has determined that thus P2, P3 and P4 level point are the 225V direct current.when electrical network is abnormal, the lower voltage of ac bus or disappearance, capacitor C 1 is slowly discharged by discharge resistance R4, the P2 level point progressively reduces, and the P4 level point does not change, and when the P2 level point during lower than the P4 level point, concrete low voltage number is determined by D3, in the present embodiment, when the P2 level point lower than the P4 level point during lower than 20V, voltage stabilizing didoe D3 conducting, capacitor C 2 is by the light-emitting diode of photoelectrical coupler U1 inside, voltage stabilizing didoe D3 and voltage stabilizing didoe D4 discharge, this moment is in case form discharging current, the phototriode conducting of photoelectrical coupler U1, capacitor C 1 all can be carried out repid discharge by resistance R 2 with capacitor C 2, and capacitor C 2 discharging currents increase, make the phototriode conduction impedance of photoelectrical coupler U1 further less, form positive feedback, capacitor C 1 is discharged in the short time at the utmost point fully with capacitor C 2, the P4 level point is reduced to 0VDC, metal-oxide-semiconductor Q1 turn-offs, realized closing of dc bus power-supply circuit.As seen in this circuit, determine that the device of time delayed turn-off is C1, R4 and D3, therefore by adjusting this type of device and size, can realize the timing of different time length, simple in structure, 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 of described full-bridge rectifier D9 output connects the end of fuse F1, the positive pole of the described diode D10 of another termination of described fuse F1, negative pole and the output voltage of filter capacitor C5 in parallel and the described diode D10 of termination of filter capacitor C6, connect the negative pole of described full-bridge rectifier D9 output after filter capacitor C5 in parallel and the other end of filter capacitor C6.The 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, export approximately 250VDC at the P6 point, owing to not controlling rectification, this output level is relevant with filter capacitor C6 to load and filter capacitor C5, therefore according to different loads, and can be with output voltage stabilization at required level by adjusting 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, the end of filter capacitor C3, the grid of described metal-oxide-semiconductor Q1 connects the negative pole of voltage stabilizing didoe pipe D5, it is anodal that the negative pole of described voltage stabilizing didoe pipe D5 meets anti-filling diode D6, the negative pole of described diode D8 connects the end of described filter capacitor C4, ground connection after the other end of described filter capacitor C3 is connected 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 an end of capacitor C 3 and the source electrode of described metal-oxide-semiconductor Q1.The specific works process is as follows: dc bus carries out linear voltage by current-limiting resistance R1 and metal-oxide-semiconductor Q1 to be regulated, output voltage is determined by the P4 point voltage, designing in the present invention the P4 point voltage is 225VDC, and filling with diode D6 clamper P5 level point by voltage stabilizing didoe D5 and counnter attack is 221VDC.P5 by voltage stabilizing didoe D7, parallel diode D8 and filter capacitor C4 after level be 200VDC, and realize in parallel with the output that exchanges power-supply circuit, because direct current power-supply circuit output voltage is 200VDC, lower than the 250VDC that exchanges power-supply circuit output, therefore at electrical network under normal circumstances, under the effect of parallel diode, dc bus and no-output, after voltage stabilizing didoe D7 has guaranteed that the direct current power-supply circuit is closed simultaneously, filter capacitor C3 can slowly not discharge if any remaining capacity yet, has improved the stability of a system and auxiliary source efficient.
Technical scheme of the present invention is: a kind of photovoltaic combining inverter low voltage crossing auxiliary power supply method is provided, 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, and described auxiliary power supply method comprises the steps:
During the electrical network normal power supply, described interchange power-supply circuit is from exchanging the power taking of test cross stream bus, and simultaneously, 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, the direct current power-supply circuit is from the dc bus power taking of DC side, simultaneously, described charging capacitor C1 and charging capacitor C2 slowly discharge by described discharge resistance R4, after reaching setting-up time, to zero level, auxiliary source output is closed by photoelectrical coupler U1 and discharge resistance R2 repid discharge for described charging capacitor C1 and charging capacitor C2;
During power system restoration, described interchange power-supply circuit is from the power taking of AC ac bus, and auxiliary source is normally exported, and charges to simultaneously saturatedly to described charging capacitor C1 and charging capacitor C2 by described resistance R 3, and described time delayed turn-off circuit enters stable state again.
As shown in Figure 3, the specific works process is as follows:
A. in T1 period, electrical network is normal, and auxiliary source measures electricity from interchange, be simultaneously auxiliary source in C1 and C2 charging, the voltage of P2 and P4 is progressively stable in this stage;
B. in T2 period, electrical network interrupts, and auxiliary source is from the dc bus power taking, and C1 slowly discharges by R4, and the P2 point voltage also progressively reduces, and the P4 point voltage remains unchanged;
C. in T3 period, the P2 point voltage is reduced to set point, and the D3 conducting triggers U1 work simultaneously, and to zero level, auxiliary source output voltage P6 closes at this moment by the R2 repid discharge for C1 and C2,
D. in T4 period, power system restoration, in auxiliary source, C1 and C2 charge again, and P2 and P4 voltage progressively recover;
E. in T5 period, the electrical network normal operation, auxiliary source enters stable state, and ac bus provides energy for output voltage P6.
By above-mentioned emulation, verified the auxiliary source scheme simple circuit that the present invention proposes, reliable operation can satisfy photovoltaic combining inverter low voltage crossing process to the requirement of power supply, has also reduced product cost simultaneously, has strengthened 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 exchanging 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 the electrical network normal power supply, described interchange power-supply circuit is from exchanging the power taking of test cross stream bus, and simultaneously, described charging capacitor C1 charges, and keeps the voltage stabilization of described time delayed turn-off circuit.When mains supply interrupted, the direct current power-supply circuit was from the dc bus power taking of DC side, and described charging capacitor C1 slowly discharges by described discharge resistance R4, and when being discharged to zero level, output voltage is closed.During power system restoration, described charging capacitor C1 charging, described interchange power-supply circuit is from the power taking of AC ac bus, and output voltage progressively restores electricity.The present invention need not extra low-voltage accessory power supply, and simple in structure, timing is accurate, and reliability is high, has guaranteed the reliably working of inverter low voltage ride-through function, has also further reduced product cost.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. photovoltaic combining inverter low voltage crossing auxiliary power supply, it is characterized in that, comprise the interchange power-supply circuit, the direct current power-supply circuit, time delayed turn-off circuit, described time delayed turn-off circuit comprises capacitor C 1, capacitor C 2, 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, described rectifier diode D1 and the rear described power-supply circuit that exchanges of a termination of current-limiting resistance R3 series connection, the other end of described capacitor C 1 and a described current-limiting resistance R3 of termination after described discharge resistance R4 is in parallel, 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 D4 is connected in series the positive pole of described voltage stabilizing didoe D2, the positive pole of described capacitor C 1 and the described voltage stabilizing didoe D3 of the other end after described discharge resistance R4 is in parallel, 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 an end of described capacitor C 2, one end of described capacitor C 2 also connects the positive pole of diode in described photoelectrical coupler U1, described capacitor C 2 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.
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 of described full-bridge rectifier D9 output connects the end of fuse F1, the positive pole of the described diode D10 of another termination of described fuse F1, negative pole and the output voltage of filter capacitor C5 in parallel and the described diode D10 of termination of filter capacitor C6, connect the negative pole of described full-bridge rectifier D9 output 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 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, the end of filter capacitor C3, the grid of described metal-oxide-semiconductor Q1 connects the negative pole of voltage stabilizing didoe pipe D5, it is anodal that the negative pole of described voltage stabilizing didoe pipe D5 meets anti-filling diode D6, the negative pole of described diode D8 connects the end of described filter capacitor C4, ground connection after the other end of described filter capacitor C3 is connected with the other end of described filter capacitor C4.
4. 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 voltage stabilizing didoe D1 and resistance R 3, and described interchange power-supply circuit is by described voltage stabilizing didoe D1 and 1 charging of 3 pairs of capacitor C of described resistance R.
5. photovoltaic combining inverter low voltage crossing auxiliary power supply according to claim 1, is characterized in that, described capacitor C 1 is slowly discharged by R4 after ac bus disappears, and can be by U1 and R2 repid discharge.
6. photovoltaic combining inverter low voltage crossing auxiliary power supply according to claim 1, it is characterized in that, described direct current power-supply circuit comprises voltage stabilizing didoe D7, 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 an end of capacitor C 3 and the source electrode of described metal-oxide-semiconductor Q1.
7. photovoltaic combining inverter low voltage crossing auxiliary power supply method, it is characterized in that, comprise exchanging 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, and described auxiliary power supply method comprises the steps:
During the electrical network normal power supply, described interchange power-supply circuit is from exchanging the power taking of test cross stream bus, and simultaneously, 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, the direct current power-supply circuit is from the dc bus power taking of DC side, simultaneously, described charging capacitor C1 and charging capacitor C2 slowly discharge by described discharge resistance R4, after reaching setting-up time, to zero level, auxiliary source output is closed by photoelectrical coupler U1 and discharge resistance R2 repid discharge for described charging capacitor C1 and charging capacitor C2;
During power system restoration, described interchange power-supply circuit is from the power taking of AC ac bus, and auxiliary source is normally exported, and charges to simultaneously saturatedly to described charging capacitor C1 and charging capacitor C2 by described resistance R 3, and described time delayed turn-off circuit enters stable state again.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104217A (en) * | 2014-07-08 | 2014-10-15 | 安徽金峰新能源股份有限公司 | Power energy storage module for under-voltage protection of 500kW and 630kW photovoltaic inverter |
| CN104600831A (en) * | 2015-01-23 | 2015-05-06 | 南京南瑞继保电气有限公司 | Inverter auxiliary power supply system and method |
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| CN104600831A (en) * | 2015-01-23 | 2015-05-06 | 南京南瑞继保电气有限公司 | Inverter auxiliary power supply system and method |
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