CN204597770U - A kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter - Google Patents
A kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter Download PDFInfo
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- CN204597770U CN204597770U CN201520105814.1U CN201520105814U CN204597770U CN 204597770 U CN204597770 U CN 204597770U CN 201520105814 U CN201520105814 U CN 201520105814U CN 204597770 U CN204597770 U CN 204597770U
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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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Abstract
Anti-error-polarity connection device for photovoltaic DC-to-AC converter belongs to an anti-error-polarity connection device technique field, particularly relates to a kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter.The utility model provides a kind of result of use good and the low anti-error-polarity connection device for photovoltaic DC-to-AC converter of cost.The utility model comprises error-polarity connection detection module, under-voltage release and circuit breaker, the detection port of its structural feature error-polarity connection detection module is connected with positive and negative DC master row, the signal output port of error-polarity connection detection module is connected with the signal input port of under-voltage release, and the control output end of under-voltage release is connected with circuit breaker open and close controlling end.
Description
Technical field
The utility model belongs to anti-error-polarity connection device technique field, particularly relates to a kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter.
Background technology
In " photovoltaic power generation grid-connected inverter technical specification " (NB/T 32004-2013) that National Energy Board promulgates for 2013, inverter direct-flow side error-polarity connection is required: " misconnection of inverter direct current input polarity is that inverter can be protected automatically; when polarity and phase sequence correctly access, inverter should be able to normally work " (7.7.3.1 money).DC side error-polarity connection will make IGBT reverse-conducting form short circuit, and under this state, reverse flow is very big through the electric current of IGBT, and be easy to the damage causing IGBT, therefore error-polarity connection is very serious for the infringement of inverter.
Several polarity counnter attack protections more common on the market at present have following several.
1, every phase IGBT is connected in series counnter attack diode, and when DC side reverse power connection, what counnter attack diode two ends applied is reverse voltage, diode not conducting, thus making the open circuit of IGBT return circuit, reverse voltage is only born at IGBT two ends, can't oppositely open circuit conducting and burning out.Although this mode can be avoided because artificial misconnection electric power polarity causes possible infringement to IGBT well, extremely uneconomical (a high pressure counnter attack diode often thousands of unit), is applied in Practical Project and greatly will improves cost.
2, intelligent breaker is selected at DC power supply entrance---the mechanical/electrical magnetic mechanism of the integrated a set of complexity of circuit breaker internal, when meeting operation condition, mechanism makes circuit breaker trip.The design of this kind of breaker mechanism is accurate and complicated, and defencive function is complete, but price is very high, and installation volume is larger.
Summary of the invention
The utility model is exactly for the problems referred to above, provides a kind of result of use good and the low anti-error-polarity connection device for photovoltaic DC-to-AC converter of cost.
For achieving the above object, the utility model adopts following technical scheme, the utility model comprises error-polarity connection detection module, under-voltage release and circuit breaker, the detection port of its structural feature error-polarity connection detection module is connected with positive and negative DC master row, the signal output port of error-polarity connection detection module is connected with the signal input port of under-voltage release, and the control output end of under-voltage release is connected with circuit breaker open and close controlling end.
As a kind of preferred version, error-polarity connection detection module described in the utility model comprises resistance R1, resistance R1 one end respectively with the detection port positive terminal of error-polarity connection detection module, electric capacity C2 one end, electric capacity C3 one end, electric capacity C4 one end, signal output port one end of error-polarity connection detection module is connected, the resistance R1 other end respectively with metal-oxide-semiconductor Q1 grid, resistance R2 one end, electric capacity C1 one end, NPN triode Q3 collector electrode, metal-oxide-semiconductor Q2 grid be connected, metal-oxide-semiconductor Q1 drain respectively with the resistance R2 other end, the electric capacity C1 other end, NPN triode Q3 emitter, resistance R3 one end, metal-oxide-semiconductor Q2 source electrode, resistance R5 one end be connected, the resistance R3 other end respectively with NPN triode Q3 base stage, voltage-stabiliser tube ZD2 anode be connected, voltage-stabiliser tube ZD2 negative electrode is connected with resistance R4 one end, the resistance R4 other end respectively with the resistance R5 other end, metal-oxide-semiconductor Q2 drains, the electric capacity C2 other end, the electric capacity C3 other end, the electric capacity C4 other end, ground wire, the signal output port other end of error-polarity connection detection module is connected, and metal-oxide-semiconductor Q1 source electrode is connected with the detection port negative pole end of error-polarity connection detection module.
As another kind of preferred version, metal-oxide-semiconductor Q1 grid described in the utility model is connected with voltage-stabiliser tube ZD2 negative electrode, and metal-oxide-semiconductor Q1 drain electrode is connected with voltage-stabiliser tube ZD2 anode.。
Secondly, under-voltage release described in the utility model adopts YU-C24/T4-6 type under-voltage release.
In addition, circuit breaker described in the utility model adopts T6L630 TMA630 FF 4P type circuit breaker.
The utility model beneficial effect.
The utility model is matched by error-polarity connection detection module, under-voltage release and circuit breaker, stop the circuit breaker that artificially closes a floodgate in error-polarity connection situation, prevent misoperation to the infringement of device core power device IGBT, fundamentally stop the harm that error-polarity connection may bring.
The utility model forms simple and practical and has very high economy, can reduce the manufacturing cost of photovoltaic DC-to-AC converter preferably.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described further.The utility model protection range is not only confined to the statement of following content.
Fig. 1 is the utility model error-polarity connection detection module circuit theory diagrams.
Fig. 2 is utility model works flow chart.
Embodiment
As shown in the figure, the utility model comprises error-polarity connection detection module, under-voltage release and circuit breaker, the detection port of its structural feature error-polarity connection detection module is connected with positive and negative DC master row, the signal output port of error-polarity connection detection module is connected with the signal input port of under-voltage release, and the control output end of under-voltage release is connected with circuit breaker open and close controlling end.
Described error-polarity connection detection module comprises resistance R1, resistance R1 one end respectively with the detection port positive terminal of error-polarity connection detection module, electric capacity C2 one end, electric capacity C3 one end, electric capacity C4 one end, signal output port one end of error-polarity connection detection module is connected, the resistance R1 other end respectively with metal-oxide-semiconductor Q1 grid, resistance R2 one end, electric capacity C1 one end, NPN triode Q3 collector electrode, metal-oxide-semiconductor Q2 grid be connected, metal-oxide-semiconductor Q1 drain respectively with the resistance R2 other end, the electric capacity C1 other end, NPN triode Q3 emitter, resistance R3 one end, metal-oxide-semiconductor Q2 source electrode, resistance R5 one end be connected, the resistance R3 other end respectively with NPN triode Q3 base stage, voltage-stabiliser tube ZD2 anode be connected, voltage-stabiliser tube ZD2 negative electrode is connected with resistance R4 one end, the resistance R4 other end respectively with the resistance R5 other end, metal-oxide-semiconductor Q2 drains, the electric capacity C2 other end, the electric capacity C3 other end, the electric capacity C4 other end, ground wire, the signal output port other end of error-polarity connection detection module is connected, and metal-oxide-semiconductor Q1 source electrode is connected with the detection port negative pole end of error-polarity connection detection module.
Described metal-oxide-semiconductor Q1 grid is connected with voltage-stabiliser tube ZD2 negative electrode, and metal-oxide-semiconductor Q1 drain electrode is connected with voltage-stabiliser tube ZD2 anode.
Described under-voltage release adopts YU-C24/T4-6 type under-voltage release.When the supply power voltage of YU-C24/T4-6 type device for under-voltage releasing equipment is greater than the 0.8U of its rated value
ntime, device for under-voltage releasing equipment does not work, and circuit breaker does not control by it.Keep current state, when the supply power voltage of device for under-voltage releasing equipment is brought down below the 0.7-0.35U of its rated value
ntime, device for under-voltage releasing equipment action---cut-off breaker; When device for under-voltage releasing equipment no power, circuit breaker or main contact can not close---and circuit breaker is for trip status.
Described circuit breaker adopts T6L630 TMA630 FF 4P type circuit breaker.
Below in conjunction with accompanying drawing, the course of work of the present utility model is described.
As shown in Figure 2, when detection module detects that DC master row polarity is correct, export high level (24V), this level is by the plant-grid connection as device for under-voltage releasing equipment, do not meet device for under-voltage releasing equipment condition of work, circuit breaker keeps normal condition, can carry out subsequent operation (closing operation); When detection module detects DC master row reverse polarity connection, output low level (0V), this level, by the plant-grid connection as device for under-voltage releasing equipment, meets device for under-voltage releasing equipment condition of work, circuit breaker tripping, cannot carry out subsequent operation (closing operation); The trip status of circuit breaker will keep always, until electric power polarity adjustment is correct---and detection module outputs low level.
As shown in Figure 1, module, in real time to the voltage sample on positive and negative DC master row, carries out polarity judging by the circuit of inside.When polarity access is correct, input current starts electric capacity C2, C3, C4 charging, and the pressure drop ratio now on R5 is higher, Q3 conducting, Q1 and Q2 ends; Work as C2, C3, C4 charging completes substantially, and when the pressure drop on R5 is not enough to allow Q3 conducting, Q1 and Q2 simultaneously conducting (dotted arrow represent be current path after Q1 and Q2 conducting), module output exports high level (24V).When polarity access mistake, Q1 and Q2 can not conducting, makes circuit breaker, module output output low level (0V).
Be understandable that, above about specific descriptions of the present utility model, the technical scheme described by the utility model embodiment is only not limited to for illustration of the utility model, those of ordinary skill in the art is to be understood that, still can modify to the utility model or equivalent replacement, to reach identical technique effect; Needs are used, all within protection range of the present utility model as long as meet.
Claims (5)
1. the anti-error-polarity connection device for photovoltaic DC-to-AC converter, comprise error-polarity connection detection module, under-voltage release and circuit breaker, it is characterized in that: the detection port of error-polarity connection detection module is connected with positive and negative DC master row, the signal output port of error-polarity connection detection module is connected with the signal input port of under-voltage release, and the control output end of under-voltage release is connected with circuit breaker open and close controlling end.
2. a kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter according to claim 1, is characterized in that: described error-polarity connection detection module comprises resistance R1, resistance R1 one end respectively with the detection port positive terminal of error-polarity connection detection module, electric capacity C2 one end, electric capacity C3 one end, electric capacity C4 one end, signal output port one end of error-polarity connection detection module is connected, the resistance R1 other end respectively with metal-oxide-semiconductor Q1 grid, resistance R2 one end, electric capacity C1 one end, NPN triode Q3 collector electrode, metal-oxide-semiconductor Q2 grid be connected, metal-oxide-semiconductor Q1 drain respectively with the resistance R2 other end, the electric capacity C1 other end, NPN triode Q3 emitter, resistance R3 one end, metal-oxide-semiconductor Q2 source electrode, resistance R5 one end be connected, the resistance R3 other end respectively with NPN triode Q3 base stage, voltage-stabiliser tube ZD2 anode be connected, voltage-stabiliser tube ZD2 negative electrode is connected with resistance R4 one end, the resistance R4 other end respectively with the resistance R5 other end, metal-oxide-semiconductor Q2 drains, the electric capacity C2 other end, the electric capacity C3 other end, the electric capacity C4 other end, ground wire, the signal output port other end of error-polarity connection detection module is connected, and metal-oxide-semiconductor Q1 source electrode is connected with the detection port negative pole end of error-polarity connection detection module.
3. a kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter according to claim 2, is characterized in that: described metal-oxide-semiconductor Q1 grid is connected with voltage-stabiliser tube ZD2 negative electrode, and metal-oxide-semiconductor Q1 drain electrode is connected with voltage-stabiliser tube ZD2 anode.
4. a kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter according to claim 3, is characterized in that: described under-voltage release adopts YU-C24/T4-6 type under-voltage release.
5. a kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter according to claim 4, is characterized in that: described circuit breaker adopts T6L630 TMA630 FF 4P type circuit breaker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520105814.1U CN204597770U (en) | 2015-02-13 | 2015-02-13 | A kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520105814.1U CN204597770U (en) | 2015-02-13 | 2015-02-13 | A kind of anti-error-polarity connection device for photovoltaic DC-to-AC converter |
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| CN204597770U true CN204597770U (en) | 2015-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790248A (en) * | 2016-05-16 | 2016-07-20 | 阿克苏舒奇蒙光伏发电有限公司 | Photovoltaic microgrid anti-reverse connection circuit |
-
2015
- 2015-02-13 CN CN201520105814.1U patent/CN204597770U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790248A (en) * | 2016-05-16 | 2016-07-20 | 阿克苏舒奇蒙光伏发电有限公司 | Photovoltaic microgrid anti-reverse connection circuit |
| CN105790248B (en) * | 2016-05-16 | 2019-08-13 | 阿克苏舒奇蒙光伏发电有限公司 | The micro- electric reverse-connection preventing circuit of photovoltaic |
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