CN203981841U - Single-phase photovoltaic grid-connected inverter auto-cutout device - Google Patents
Single-phase photovoltaic grid-connected inverter auto-cutout device Download PDFInfo
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- CN203981841U CN203981841U CN201420368780.0U CN201420368780U CN203981841U CN 203981841 U CN203981841 U CN 203981841U CN 201420368780 U CN201420368780 U CN 201420368780U CN 203981841 U CN203981841 U CN 203981841U
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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
Single-phase photovoltaic grid-connected inverter auto-cutout device, relate to photovoltaic combining inverter technical field, be used for controlling described grid-connected inverters or off-grid, it comprises the gate-controlled switch of two groups of series connection, described inverter via described two groups of gate-controlled switches to grid power transmission, it is characterized in that, also comprise the failure detector for the failure condition at the described two groups of gate-controlled switches of grid-connected front detection, failure detector comprises the live wire that is connected across between described two groups of gate-controlled switches and the voltage detection unit between zero line, voltage detection unit is for detection of the live wire between described two groups of gate-controlled switches and the voltage between zero line.Only need that a voltage detection unit is set and can realize the self-checking function of auto-cutout device, simple in structure, process of self-test is simple, and in process of self-test, the minimum switch twice that only needs of gate-controlled switch, has reduced the on-off times of the gate-controlled switch of auto-cutout device in process of self-test effectively.
Description
Technical field
The utility model relates to photovoltaic combining inverter technical field, is specifically related to a kind of single-phase photovoltaic inverter grid-connected system auto-cutout device.
Background technology
Due to the rise of green energy resource, photovoltaic combining inverter has obtained application more and more widely.Photovoltaic combining inverter is divided into isolated form and non-isolation type conventionally, because non-isolated photovoltaic grid-connected inverter efficiency is high, is the mainstream model on market.The input of photovoltaic combining inverter is connected on photovoltaic substrate, output is connected on electrical network, for ensureing safety, safety requires photovoltaic combining inverter must comprise auto-cutout device, auto-cutout device is connected between photovoltaic combining inverter output terminal and electrical network, auto-cutout device closure, and photovoltaic combining inverter is just grid-connected, auto-cutout device disconnects, and photovoltaic combining inverter is with regard to off-grid.
Photovoltaic combining inverter arranges two groups of gate-controlled switches that are in series conventionally as auto-cutout device, adopt the mode of this Redundant Control to ensure safety, even if one group of gate-controlled switch breaks down, another group gate-controlled switch also can ensure photovoltaic combining inverter success off-grid.For ensureing the reliability of auto-cutout device, safety requires will carry out self-inspection at grid-connected front auto-cutout device, to guarantee the automatic short-circuit device non-fault of grid-connected photovoltaic combining inverter.The fault of auto-cutout device has two kinds, and to be gate-controlled switch occur bonding phenomenon after cut-off signal and can not normally disconnect receiving one, and another kind is gate-controlled switch receive can not normally closed after closure signal.Publication No. is that the Chinese invention patent application of CN102628925A discloses a kind of photovoltaic DC-to-AC converter relay fault detection method and device, in its auto-cutout device for realizing the failure detector complicated structure of self-checking function, process of self-test repeat circuit group need be gone through 9 continuous variable condition, hence one can see that, its process of self-test more complicated, need the relay (being gate-controlled switch) of auto-cutout device to carry out multiple switching action, affected the serviceable life of auto-cutout device.
Summary of the invention
For the problems referred to above of prior art, the utility model provides a kind of single-phase photovoltaic grid-connected inverter auto-cutout device, its failure detector for self-inspection is simple in structure, can allow process of self-test simplify, and reduces the on-off times of the gate-controlled switch of auto-cutout device in process of self-test.
For achieving the above object, the utility model provides following technical scheme.
Single-phase photovoltaic grid-connected inverter auto-cutout device, be used for controlling described grid-connected inverters or off-grid, comprise the gate-controlled switch of two groups of series connection, described inverter via described two groups of gate-controlled switches to grid power transmission, also comprise the failure detector for the failure condition at the described two groups of gate-controlled switches of grid-connected front detection, failure detector comprises the live wire that is connected across between described two groups of gate-controlled switches and the voltage detection unit between zero line, and voltage detection unit is for detection of the live wire between described two groups of gate-controlled switches and the voltage between zero line.
Wherein, described gate-controlled switch is relay.
Wherein, every group of gate-controlled switch comprises a relay, and each relay comprises the contact of two interlocks, a contact switch live wire, another contact switch zero line.
Wherein, also comprise switch drive unit, each relay is by a switch drive unit drives, each switch drive unit comprises a metal-oxide-semiconductor, one end of the coil of this metal-oxide-semiconductor collector connecting relay, grounded emitter, base stage is as driving signal input, the other end external power supply of the coil of relay.
Wherein, voltage detection unit comprises Test Switchboard, and voltage detection unit is connected across between described live wire and zero line via Test Switchboard.
The beneficial effects of the utility model are: detect live wire between two groups of gate-controlled switches and the voltage between zero line voltage detection unit is set between two groups of gate-controlled switches, control after the closed or disconnection of two groups of gate-controlled switches, the voltage that voltage detection unit detects can reflect whether the voltage of electrical network or photovoltaic combining inverter arrives voltage detection unit by gate-controlled switch, thereby judges whether corresponding gate-controlled switch has fault.Only need that a voltage detection unit is set and can realize the self-checking function of auto-cutout device, simple in structure, process of self-test is simple, and in process of self-test, the minimum switch twice that only needs of gate-controlled switch, has reduced the on-off times of the gate-controlled switch of auto-cutout device in process of self-test effectively.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of single-phase photovoltaic grid-connected inverter auto-cutout device of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.
As shown in Figure 1, single-phase photovoltaic grid-connected inverter auto-cutout device of the present utility model, comprise relay K 1 and the relay K 2 of series connection, each relay comprises the contact of two interlocks, a contact switch live wire, another contact switch zero line, described inverter via relay K 1 and relay K 2 to grid power transmission, also comprise failure detector, failure detector comprises the live wire that is connected across between relay K 1 and relay K 2 and the voltage detection unit between zero line, as shown in Figure 1, voltage detection unit is for detection of the voltage between 2 of 1 of Test and Test.Further, voltage detection unit comprises Test Switchboard K3, voltage detection unit is connected across between described live wire and zero line via Test Switchboard K3, Test Switchboard K3 is only just closed in the time of auto-cutout device self-inspection of the present utility model, when not needing self-inspection, auto-cutout device of the present utility model just disconnects, to avoid voltage detection unit always in running order.
The process of self-test of auto-cutout device of the present utility model is, first pilot relay K2 disconnects, and make not output voltage of photovoltaic combining inverter, as shown in Figure 1, detect the voltage between 1 of Test and Test at 2 by voltage detection unit, if the voltage that now voltage detection unit detects is greater than setting value V1, the voltage that shows electrical network has arrived voltage detection unit via relay K 2, judge that thus relay K 2 has the fault of bonding, if the voltage that now voltage detection unit detects is less than setting value V2, the voltage that shows electrical network is cut off by relay K 2, judge thus the fault of relay K 2 without bonding, detect after the fault of relay K 2 without bonding, pilot relay K2 closure, if the voltage that now voltage detection unit detects is less than setting value V2, the voltage that shows electrical network is cut off by relay K 2, judging thus that relay K 2 has can not normally closed fault, if the voltage that now voltage detection unit detects is greater than setting value V1, show that the voltage of electrical network has arrived voltage detection unit via relay K 2, judge thus relay K 2 normally closeds, after this make photovoltaic combining inverter output voltage, and pilot relay K1 and relay K 2 disconnect, if the voltage that now voltage detection unit detects is greater than setting value V1, the voltage that shows photovoltaic combining inverter has arrived voltage detection unit via relay K 1, judge that thus relay K 1 has the fault of bonding, if the voltage that now voltage detection unit detects is less than setting value V2, the voltage that shows photovoltaic combining inverter is cut off by relay K 1, judges thus the fault of relay K 1 without bonding, detect after the fault of relay K 1 without bonding, pilot relay K1 closure, if the voltage that now voltage detection unit detects is less than setting value V2, the voltage that shows photovoltaic combining inverter is cut off by relay K 1, judging thus that relay K 1 has can not normally closed fault, if the voltage that now voltage detection unit detects is greater than setting value V1, show that the voltage of photovoltaic combining inverter has arrived voltage detection unit via relay K 1, judge thus relay K 2 normally closeds.
As from the foregoing, the process of self-test of auto-cutout device of the present utility model is fairly simple, in process of self-test, relay K 1 and relay K 2 only need twice, switch, effectively reduce the on-off times of process of self-test repeat circuit K1 and relay K 2, extended the serviceable life of auto-cutout device of the present utility model.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection domain; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (5)
1. single-phase photovoltaic grid-connected inverter auto-cutout device, be used for controlling described grid-connected inverters or off-grid, comprise the gate-controlled switch of two groups of series connection, described inverter via described two groups of gate-controlled switches to grid power transmission, it is characterized in that, also comprise the failure detector for the failure condition at the described two groups of gate-controlled switches of grid-connected front detection, failure detector comprises the live wire that is connected across between described two groups of gate-controlled switches and the voltage detection unit between zero line, and voltage detection unit is for detection of the live wire between described two groups of gate-controlled switches and the voltage between zero line.
2. single-phase photovoltaic grid-connected inverter auto-cutout device according to claim 1, is characterized in that, described gate-controlled switch is relay.
3. single-phase photovoltaic grid-connected inverter auto-cutout device according to claim 2, is characterized in that, every group of gate-controlled switch comprises a relay, and each relay comprises the contact of two interlocks, a contact switch live wire, another contact switch zero line.
4. according to the single-phase photovoltaic grid-connected inverter auto-cutout device described in claim 2 or 3, it is characterized in that, also comprise switch drive unit, each relay is by a switch drive unit drives, each switch drive unit comprises a metal-oxide-semiconductor, one end of the coil of this metal-oxide-semiconductor collector connecting relay, grounded emitter, base stage is as driving signal input, the other end external power supply of the coil of relay.
5. single-phase photovoltaic grid-connected inverter auto-cutout device according to claim 1, is characterized in that, voltage detection unit comprises Test Switchboard, and voltage detection unit is connected across between described live wire and zero line via Test Switchboard.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420368780.0U CN203981841U (en) | 2014-07-04 | 2014-07-04 | Single-phase photovoltaic grid-connected inverter auto-cutout device |
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| CN201420368780.0U CN203981841U (en) | 2014-07-04 | 2014-07-04 | Single-phase photovoltaic grid-connected inverter auto-cutout device |
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| CN203981841U true CN203981841U (en) | 2014-12-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919655A (en) * | 2017-12-13 | 2018-04-17 | 珠海格力电器股份有限公司 | Control circuit, control method and air-conditioning |
| CN108988388A (en) * | 2018-08-06 | 2018-12-11 | 阳光电源（上海）有限公司 | A kind of grid-connected inverting system |
| CN109066798A (en) * | 2018-09-17 | 2018-12-21 | 阳光电源股份有限公司 | A kind of cutoff device of photovoltaic module |
| CN112771749A (en) * | 2018-10-03 | 2021-05-07 | 弗罗纽斯国际有限公司 | Method for testing a separation point of a photovoltaic inverter and photovoltaic inverter of this type |
-
2014
- 2014-07-04 CN CN201420368780.0U patent/CN203981841U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919655A (en) * | 2017-12-13 | 2018-04-17 | 珠海格力电器股份有限公司 | Control circuit, control method and air-conditioning |
| CN107919655B (en) * | 2017-12-13 | 2023-07-11 | 珠海格力电器股份有限公司 | Control circuit, control method and air conditioner |
| CN108988388A (en) * | 2018-08-06 | 2018-12-11 | 阳光电源（上海）有限公司 | A kind of grid-connected inverting system |
| CN109066798A (en) * | 2018-09-17 | 2018-12-21 | 阳光电源股份有限公司 | A kind of cutoff device of photovoltaic module |
| US11043802B2 (en) | 2018-09-17 | 2021-06-22 | Sungrow Power Supply Co., Ltd. | Shutdown apparatus for photovoltaic module |
| CN112771749A (en) * | 2018-10-03 | 2021-05-07 | 弗罗纽斯国际有限公司 | Method for testing a separation point of a photovoltaic inverter and photovoltaic inverter of this type |
| US11125833B1 (en) | 2018-10-03 | 2021-09-21 | Fronius International Gmbh | Method for testing a disconnection point of a photovoltaic inverter, and a photovoltaic inverter of this type |
| CN112771749B (en) * | 2018-10-03 | 2021-11-09 | 弗罗纽斯国际有限公司 | Method for testing a separation point of a photovoltaic inverter and photovoltaic inverter of this type |
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