CN103683188A - Safety detection apparatus of solar energy inverter - Google Patents
Safety detection apparatus of solar energy inverter Download PDFInfo
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- CN103683188A CN103683188A CN201310515045.8A CN201310515045A CN103683188A CN 103683188 A CN103683188 A CN 103683188A CN 201310515045 A CN201310515045 A CN 201310515045A CN 103683188 A CN103683188 A CN 103683188A
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Abstract
The invention provides a safety detection apparatus of a solar energy inverter. The apparatus comprises an inversion circuit, a cut-off device, a current sensor, a selection circuit, a current detection circuit and a processor, wherein DC input nodes DC+ and DC- are connected with the inversion circuit; the cut-off device is connected with the inversion circuit; the current sensor is connected with the cut-off device; the selection circuit is connected with the DC input nodes DC+ and DC-; the processor is respectively connected with the selection circuit, the cut-off circuit and the current detection circuit; and the current detection circuit is connected with the current sensor. The apparatus has the following advantages: an insulation resistor detection circuit and a current leakage detection circuit are ingeniously combined to share circuit to the maximum so that a circuit is substantially simplified and the components are reduced, thus the cost is lowered, and the system reliability is enhanced at the same time.
Description
Technical field
The present invention relates to solar inverter field, relate in particular to the safety detection device of solar inverter.
Background technology
Consider the fail safe of electricity generation system, solar inverter all detects and leakage current test function with insulation resistance, when electricity generation system, at DC side generation insulation breakdown or leakage current, when abnormal, forbid grid-connected or departs from electrical network, prevents from causing secondary disaster.
Meanwhile, it is all to adopt uneven bridge method that the insulation resistance of current most of solar inverter detects, and leakage current test adopts direct current sensing detection method; As shown in Figure 1, wherein, the direct current that DC+, DC-are inverter is inputted node to its circuit theory, and RDC+, RDC-are respectively corresponding node insulation resistance over the ground.The part showing in dotted line block diagram is the scheme that current solar inverter generally adopts.Wherein, DC+, DC-can be the both positive and negative polarity of solar panel, can be also the both positive and negative polarities of DC bus-bar voltage in inverter.
Its operation principle is as follows:
1. insulation resistance detects: inverter is before grid-connected, and " disconnecting apparatus " is in off-state; Inverter is prepared when grid-connected, and " dsp controller " passes through the control of " uneven bridge control circuit ", changes the operating state of " uneven bridge circuit ", then by " insulating resistor detecting circuit ", calculates the insulation resistance of system; When detection DC+, DC-insulation resistance (RDC+, RDC-) is over the ground less than set point, inverter does not carry out and net operation; When insulation resistance recovers normal, inverter just can closed " disconnecting apparatus ", carries out grid-connected.
2. leakage current test: during grid-connected inverters operation, insulation resistance detects and quits work; And now, " current sensor " detects the leakage current of inverter, gives " dsp controller " after the processing of " current detection circuit "; " dsp controller " detects the leakage current of combining inverter in real time, and when leakage current continues to surpass a certain set point or changes over a certain set point, " dsp controller " disconnection " disconnecting apparatus " also stops generating.
The problem that circuit exists at present: two circuit are completely independent, testing circuit is complicated, and cost is higher.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of safety detection device of solar inverter.
The invention provides a kind of safety detection device of solar inverter, comprise inverter circuit, disconnecting apparatus, current sensor, select circuit, current detection circuit, processor, the direct current input node DC+ of inverter, DC-, and input node DC+ with direct current, the insulation resistance over the ground that DC-is connected respectively, described direct current input node DC+, DC-is connected with described inverter circuit, described disconnecting apparatus is connected with described inverter circuit, described current sensor is connected with described disconnecting apparatus, described selection circuit is connected in described direct current input node DC+, DC-, described processor respectively with described selection circuit, described disconnecting apparatus, described current detection circuit is connected, described current detection circuit is connected with described current sensor.
As a further improvement on the present invention, described selection circuit comprises relay or semiconductor switch.
As a further improvement on the present invention, the both positive and negative polarity that described direct current input node DC+, DC-are solar panel.
As a further improvement on the present invention, described direct current input node DC+, DC-are the both positive and negative polarity of DC bus-bar voltage in solar inverter.
As a further improvement on the present invention, described processor is dsp controller or single-chip microcomputer.
As a further improvement on the present invention, described processor calculates insulation resistance or leakage current by detecting current detection circuit, and when surveyed insulation resistance or leakage current surpass set point, described processor can be set in off-state disconnecting apparatus.
The invention has the beneficial effects as follows: the present invention is by combining insulating resistor detecting circuit and leakage current detection circuit cleverly, common circuit, has simplified circuit greatly to greatest extent, has reduced components and parts, therefore reduce cost, increased the reliability of system simultaneously.
Accompanying drawing explanation
Fig. 1 is the safety detection device theory diagram of the solar inverter in background technology.
Fig. 2 is the safety detection device theory diagram of solar inverter of the present invention.
Fig. 3 is the safety detection device one embodiment theory diagram of solar inverter of the present invention.
Embodiment
As shown in Figure 2, the invention discloses a kind of safety detection device of solar inverter, comprise inverter circuit, disconnecting apparatus, current sensor, select circuit, current detection circuit, processor, the direct current input node DC+ of inverter, DC-, and input node DC+ with direct current, the insulation resistance over the ground that DC-is connected respectively, described direct current input node DC+, DC-is connected with described inverter circuit, described disconnecting apparatus is connected with described inverter circuit, described current sensor is connected with described disconnecting apparatus, described selection circuit is connected in described direct current input node DC+, DC-, described processor respectively with described selection circuit, described disconnecting apparatus, described current detection circuit is connected, described current detection circuit is connected with described current sensor.
The both positive and negative polarity that described direct current input node DC+, DC-are solar panel.
Described direct current input node DC+, DC-are the both positive and negative polarity of DC bus-bar voltage in solar inverter.
As shown in Figure 3, described processor is dsp controller or single-chip microcomputer, and described selection circuit comprises relay or semiconductor switch.
Described processor calculates insulation resistance or leakage current by detecting current detection circuit, and when surveyed insulation resistance or leakage current surpass set point, described processor can be set in off-state disconnecting apparatus.
Selecting in the present invention circuit can be also combinational circuit or other semiconductor combinations circuit of relay and other elements.
1. insulation resistance detects: before grid-connected inverters, disconnecting apparatus is in off-state, and the flow process that insulation detects is as follows:
1.1 RDC+ detect: dsp controller " closed RLY.DC-(RLY.DC+ is in off-state), now DC+, DC-, RLY.DC-, RDC+ form a current circuit (as shown in Fig. 3 dotted line), and its relational expression is: I_RDC+=VDC/RDC+; DSP controller detects DC+, the voltage difference VDC of DC-, and detect after the electric current I _ RDC+ of current sensor, can calculate insulation resistance RDC+:RDC+=VDC/I_RDC+ of DC+;
1.2 RDC-detect: same method; the closed RLY.DC+(RLY.DC-of dsp controller is in off-state); DSP controller detects DC+; the voltage difference VDC of DC-; and detect after the electric current I _ RDC-of current sensor, can calculate insulation resistance RDC-:RDC-=VDC/I_RDC-of DC-;
When the insulation resistance detecting is normal, dsp controller is closed by disconnecting apparatus, grid-connected inverters generating, and now insulation resistance detects and quits work; And now, current sensor detects the leakage current of inverter, gives dsp controller, the leakage current of dsp controller real time computation system after the processing of overcurrent sensing circuit, when system leakage current or leakage current sudden change surpass set point, dsp controller disconnects disconnecting apparatus.
The technical scheme that the present invention proposes, takes full advantage of the condition that insulation resistance detects and leakage current test function can not worked simultaneously, and common circuit to greatest extent, to reduce complexity and the cost of system.The present invention is by combining insulating resistor detecting circuit and leakage current detection circuit cleverly, and common circuit, has simplified circuit greatly to greatest extent, has reduced components and parts, has therefore reduced cost, has increased the reliability of system simultaneously.
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, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. the safety detection device of a solar inverter, it is characterized in that: comprise inverter circuit, disconnecting apparatus, current sensor, select circuit, current detection circuit, processor, the direct current input node DC+ of inverter, DC-, and input node DC+ with direct current, the insulation resistance over the ground that DC-is connected respectively, described direct current input node DC+, DC-is connected with described inverter circuit, described disconnecting apparatus is connected with described inverter circuit, described current sensor is connected with described disconnecting apparatus, described selection circuit is connected in described direct current input node DC+, DC-, described processor respectively with described selection circuit, described disconnecting apparatus, described current detection circuit is connected, described current detection circuit is connected with described current sensor.
2. safety detection device according to claim 1, is characterized in that: described selection circuit comprises relay or semiconductor switch.
3. safety detection device according to claim 1, is characterized in that: the both positive and negative polarity that described direct current input node DC+, DC-are solar panel.
4. safety detection device according to claim 1, is characterized in that: described direct current input node DC+, DC-are the both positive and negative polarity of DC bus-bar voltage in solar inverter.
5. according to the safety detection device described in claim 1 to 4 any one, it is characterized in that: described processor is dsp controller or single-chip microcomputer.
6. safety detection device according to claim 5, it is characterized in that: described processor calculates insulation resistance or leakage current by detecting current detection circuit, when surveyed insulation resistance or leakage current surpass set point, described processor can be set in off-state disconnecting apparatus.
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| CN201310515045.8A CN103683188B (en) | 2013-10-28 | 2013-10-28 | The safety detection device of solar inverter |
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| CN201310515045.8A CN103683188B (en) | 2013-10-28 | 2013-10-28 | The safety detection device of solar inverter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104765012A (en) * | 2015-04-21 | 2015-07-08 | 阳光电源股份有限公司 | Fault detection method, fault detection circuit and inverter |
| CN105021935A (en) * | 2014-04-25 | 2015-11-04 | 青岛海信日立空调系统有限公司 | Method and electric device for detecting electric leakage of electric device |
| CN107968627A (en) * | 2017-11-14 | 2018-04-27 | 珠海格力电器股份有限公司 | Detection device and method and the non-isolation type photovoltaic system comprising the device |
| CN109613409A (en) * | 2018-12-13 | 2019-04-12 | 北京金风科创风电设备有限公司 | Wind power converter insulation detection circuit and method and wind power converter |
| CN111917127A (en) * | 2020-07-10 | 2020-11-10 | 爱士惟新能源技术(江苏)有限公司 | Control method and system for GFCI circuit of photovoltaic inverter |
| WO2023283771A1 (en) * | 2021-07-12 | 2023-01-19 | 华为数字能源技术有限公司 | Power supply system, protection method for power supply system, and dc/dc converter |
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| CN107968627A (en) * | 2017-11-14 | 2018-04-27 | 珠海格力电器股份有限公司 | Detection device and method and the non-isolation type photovoltaic system comprising the device |
| CN109613409A (en) * | 2018-12-13 | 2019-04-12 | 北京金风科创风电设备有限公司 | Wind power converter insulation detection circuit and method and wind power converter |
| CN111917127A (en) * | 2020-07-10 | 2020-11-10 | 爱士惟新能源技术(江苏)有限公司 | Control method and system for GFCI circuit of photovoltaic inverter |
| WO2023283771A1 (en) * | 2021-07-12 | 2023-01-19 | 华为数字能源技术有限公司 | Power supply system, protection method for power supply system, and dc/dc converter |
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| CN103683188B (en) | 2017-07-04 |
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Effective date of registration: 20201103 Address after: Room 201 and 301, building 6, Nangang No.2 Industrial Park, no.1026, Songbai Road, Yangguang community, Xili street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN EN-PLUS TECHNOLOGIES Co.,Ltd. Address before: 518000, Guangdong, Baoan District, Taoyuan, Shenzhen District 16, 23 units, 1 units, 14C Patentee before: Ni Xipeng |
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