CN202930969U - Single-phase photovoltaic grid-connected power generation inverter circuit capable of reducing earth leakage current - Google Patents
Single-phase photovoltaic grid-connected power generation inverter circuit capable of reducing earth leakage current Download PDFInfo
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- CN202930969U CN202930969U CN2012205494998U CN201220549499U CN202930969U CN 202930969 U CN202930969 U CN 202930969U CN 2012205494998 U CN2012205494998 U CN 2012205494998U CN 201220549499 U CN201220549499 U CN 201220549499U CN 202930969 U CN202930969 U CN 202930969U
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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
The utility model discloses a single-phase photovoltaic grid-connected power generation inverter circuit capable of reducing earth leakage current. The single-phase photovoltaic grid-connected power generation inverter circuit capable of reducing earth leakage current is used for being connected between a photovoltaic array output direct current voltage circuit and a filter grid-connected circuit. The device comprises a three switch bridge arm circuit, a two switch bridge arm circuit and a flying switch. According to the utility model, a high frequency voltage interference signal is not superimposed in direct current voltage output by a photovoltaic array, and the magnitude of earth leakage current can be effectively reduced.
Description
Technical field
The utility model belongs to the solar photovoltaic technology field, is specifically related to a kind of single-phase photovoltaic grid-connected power-generation inversion circuit that can reduce Ground leakage current.
Background technology
The fast development of industry causes the fossil energy growing tensions such as oil, coal, natural gas, and solar energy is extremely abundant because of its reserves, has been subject to the great attention of domestic and international government, greatly develops the solar power generation industry.Along with the continuous increase of photovoltaic cell output and photovoltaic generating system installed capacity, the alternative functions of photovoltaic generation in the energy is more and more large, and the application percentage increase that is mainly manifested in generating electricity by way of merging two or more grid systems is very fast.In grid-connected photovoltaic system, because monolithic solar panel output voltage is low, form photovoltaic array so generally need the polylith solar panel to carry out connection in series-parallel.This just need to take very large-area soil, and parasitic capacitance is larger over the ground for photovoltaic array under the environment of humidity.Non-isolated grid-connected inverter circuit is generally operational in the high frequency state, might produce the high frequency voltage interference signal on the direct voltage of photovoltaic array output, thereby produce Ground leakage current (also claiming common mode current) on parasitic capacitance over the ground at photovoltaic array, this Ground leakage current has a strong impact on equipment itself and personal safety generation, therefore requires single-phase non-isolated grid-connected power-generation inversion circuit must limit the size of Ground leakage current.
The utility model content
The purpose of this utility model is to provide a kind of single-phase photovoltaic grid-connected power-generation inversion circuit that can reduce Ground leakage current, can be in the direct voltage of photovoltaic array output overlapped high-frequency voltage disturbance signal, can reduce the size of photovoltaic grid-connected inversion circuit Ground leakage current, make in its scope that is limited in national Specification.
The technical scheme that the utility model adopts is, a kind of single-phase photovoltaic grid-connected power-generation inversion circuit that can reduce Ground leakage current, it is characterized in that, be used for being connected between photovoltaic array output DC volt circuit and filtering parallel network circuit, this device comprises three switch bridge arm circuit, two switch bridge arm circuit and flies across switch;
Photovoltaic array output DC volt circuit has dc bus positive terminal "+" and dc bus negative pole end "-", and the filtering parallel network circuit has filtering parallel network circuit the first link E and filtering parallel network circuit the second link F;
Three switch bridge arm circuit are connected between the dc bus positive terminal "+" and dc bus negative pole end "-" of photovoltaic array output DC volt circuit after the forward series connection successively by the first power switch S1, the 5th power switch S5 and the second power switch S2 switch, draw three switch brachium pontis the first link A between the first power switch S1 emitter and the 5th power switch S5 collector electrode, draw three switch brachium pontis the second link C between the 5th power switch S5 emitter and the second power switch S2 collector electrode;
Two switch bridge arm circuit are connected between the dc bus positive terminal "+" and dc bus negative pole end "-" of photovoltaic array output DC volt circuit after being connected by the 3rd power switch S3 and the 4th power switch S4 forward, draw two switch brachium pontis link B between the 3rd power switch S3 emitter and the 4th power switch S4 collector electrode;
Flying across switch is the 6th power switch S6, and the current collection of the 6th power switch S6 very flies very to fly across switch the second link G across switch the first link D and emission;
Three switch brachium pontis the first link A are connected with filtering parallel network circuit the first link E, three switch brachium pontis the second link C with fly to be connected across switch the second link G, two switch brachium pontis link B, filtering parallel network circuit the second link F are connected across switch the first link D with flying.
The beneficial effect that the utility model can reduce the single-phase photovoltaic grid-connected power-generation inversion circuit of Ground leakage current is: when having realized that direct voltage with photovoltaic array output converts alternating current to and is incorporated into the power networks, also effectively reduced the size of Ground leakage current, had that hardware circuit is simple, conversion efficiency is high, the transless isolation, control and be easy to advantage.
Description of drawings
Fig. 1 is the module frame chart that the utility model can reduce the single-phase photovoltaic grid-connected power-generation inversion circuit of Ground leakage current;
Fig. 2 is the circuit connection diagram that the utility model can reduce the single-phase photovoltaic grid-connected power-generation inversion circuit of Ground leakage current;
wherein, PV represents photovoltaic array, D1 represents the anti-reverse charging power diode, C1 represents the dc bus filter capacitor, "+" expression dc bus positive terminal, "-" expression dc bus negative pole end, S1-S6 represents the first power switch to the six power switchs successively, L1 represents the first ac filter inductance, L2 represents the second ac filter inductance, A and C represent respectively three switch brachium pontis the first links and three switch brachium pontis the second links, B represents two switch brachium pontis links, D and G represent respectively to fly across switch the first link and fly across switch the second link, E and F represent respectively filtering parallel network circuit the first link and filtering parallel network circuit the second link,
1. photovoltaic array output DC volt circuit, 2. three switch bridge arm circuit, 3. liang switch bridge arm circuit, 4. fly across switch, 5. the filtering parallel network circuit.
Embodiment
As depicted in figs. 1 and 2, the utility model can reduce the single-phase photovoltaic grid-connected power-generation inversion circuit of Ground leakage current, be used for being connected between photovoltaic array output DC volt circuit 1 and filtering parallel network circuit 5, this device comprises three switch bridge arm circuit 2, two switch bridge arm circuit 3 and flies across switch 4.
Photovoltaic array output DC volt circuit 1 is connected to form successively by photovoltaic array PV, anti-reverse charging power diode D1 and dc bus filter capacitor C1, and photovoltaic array output DC volt circuit 1 has dc bus positive terminal "+" and dc bus negative pole end "-".
Filtering parallel network circuit 5 is comprised of single-phase electrical network and the first ac filter inductance L 1 and the second ac filter inductance L 2 that are connected to its two ends, and filtering parallel network circuit 5 has filtering parallel network circuit the first link E and filtering parallel network circuit the second link F.
Three switch bridge arm circuit 2 are connected between the dc bus positive terminal "+" and dc bus negative pole end "-" of photovoltaic array output DC volt circuit 1 after the forward series connection successively by the first power switch S1, the 5th power switch S5 and the second power switch S2 switch, draw three switch brachium pontis the first link A between the first power switch S1 emitter and the 5th power switch S5 collector electrode, draw three switch brachium pontis the second link C between the 5th power switch S5 emitter and the second power switch S2 collector electrode.
Two switch bridge arm circuit 3 are connected between the dc bus positive terminal "+" and dc bus negative pole end "-" of photovoltaic array output DC volt circuit 1 after being connected by the 3rd power switch S3 and the 4th power switch S4 forward, draw two switch brachium pontis link B between the 3rd power switch S3 emitter and the 4th power switch S4 collector electrode.
Flying across switch 4 is the 6th power switch S6, and the current collection of the 6th power switch S6 very flies very to fly across switch the second link G across switch the first link D and emission.
Three switch brachium pontis the first link A are connected with filtering parallel network circuit the first link E, three switch brachium pontis the second link C with fly to be connected across switch the second link G, two switch brachium pontis link B, filtering parallel network circuit the second link F are connected across switch the first link D with flying.
The first power switch S1 to the six power switch S6 are insulated gate bipolar transistor IGBT or power MOSFET.
Operation principle of the present utility model is:
1) be connected to the first power switch S1, the 3rd power switch S3 of dc bus positive terminal "+", and the second power switch S2 and the 4th power switch S4 that are connected to dc bus negative pole end "-", all with the HF switch frequency for example the single-polarity PWM signal of 20kHz trigger.Wherein, the first power switch S1 and the 4th power switch S4 turn on and off when being the positive half cycle of line voltage simultaneously, and the second power switch S2 and the 3rd power switch S3 turn on and off when being the line voltage negative half period simultaneously.The 5th power switch S5 and the 6th power switch S6 with single-phase mains frequency for example the low frequency signal of 50Hz trigger, wherein, conducting always when the 6th power switch S6 is the positive half cycle of line voltage, conducting always when the 5th power switch S5 is the line voltage negative half period.
2) during the positive half cycle of line voltage, the 6th power switch S6 conducting always, the second power switch S2, S3 and the 5th power switch S5 turn-off always, and the first power switch S1 and the 4th power switch S4 open and turn-off in the PWM mode simultaneously.
When the first power switch S1 and the 4th power switch S4 opened simultaneously, the electric current that photovoltaic array produces flowed by anti-reverse charging power diode D1, the first power switch S1, the first ac filter inductance L 1, single-phase electrical network, the second ac filter inductance L 2 and the 4th power switch S4.This moment, two switch brachium pontis link B and three switch brachium pontis the first link A equaled half of photovoltaic array output dc voltage to the common-mode voltage of dc bus negative pole end "-".
When the first power switch S1 and the 4th power switch S4 turn-off simultaneously, electric current on circuit carries out afterflow through the anti-paralleled diode of the first ac filter inductance L 1, single-phase electrical network, the second ac filter inductance L 2, the 6th power switch S6, the 5th power switch S5, and this moment, two switch brachium pontis link B and three switch brachium pontis the first link A also equaled half of photovoltaic array output dc voltage to the common-mode voltage of dc bus negative pole end "-".As seen common-mode voltage remains unchanged when the positive half cycle of line voltage.
3) during the line voltage negative half period, the 6th power switch S5 conducting always, the first power switch S 1, the 4th power switch S4 and the 6th power switch S6 turn-off always, and the second power switch S2 and the 3rd power switch S3 open and turn-off in the PWM mode simultaneously.
When the second power switch S2 and the 3rd power switch S3 opened simultaneously, the electric current that photovoltaic array produces flowed by anti-reverse charging power diode D1, the 3rd power switch S3, the second ac filter inductance L 2, single-phase electrical network, the first ac filter inductance L 1, the 5th power switch S5 and the second power switch S2.This moment, two switch brachium pontis link B and three switch brachium pontis the first link A still equaled half of photovoltaic array output dc voltage to the common-mode voltage of dc bus negative pole end "-".
When the second power switch S2 and the 3rd power switch S3 turn-offed simultaneously, the electric current on circuit carried out afterflow through the anti-paralleled diode of the second ac filter inductance L 2, single-phase electrical network, the first ac filter inductance L 1, the 5th power switch S5, the 6th power switch S6.This moment, two switch brachium pontis link B and three switch brachium pontis the first link A also equaled half of photovoltaic array output dc voltage to the common-mode voltage of dc bus negative pole end "-".As seen common-mode voltage also remains unchanged when the line voltage negative half period.
In a word, no matter line voltage is in positive half cycle or negative half period, two switch brachium pontis link B and three switch brachium pontis the first link A always equal half of photovoltaic array output dc voltage to the common-mode voltage of dc bus negative pole end "-", so common-mode voltage remains unchanged always, as seen this circuit can not produce leakage current on existing parasitic capacitance between photovoltaic array and the earth.
Claims (1)
1. single-phase photovoltaic grid-connected power-generation inversion circuit that can reduce Ground leakage current, it is characterized in that, be used for being connected between photovoltaic array output DC volt circuit (1) and filtering parallel network circuit (5), this device comprises three switch bridge arm circuit (2), two switch bridge arm circuit (3) and flies across switch (4);
Described photovoltaic array output DC volt circuit (1) has dc bus positive terminal "+" and dc bus negative pole end "-", and described filtering parallel network circuit (5) has filtering parallel network circuit the first link E and filtering parallel network circuit the second link F;
Described three switch bridge arm circuit (2) are connected between the dc bus positive terminal "+" and dc bus negative pole end "-" of photovoltaic array output DC volt circuit (1) after the forward series connection successively by the first power switch S1, the 5th power switch S5 and the second power switch S2 switch, draw three switch brachium pontis the first link A between the first power switch S1 emitter and the 5th power switch S5 collector electrode, draw three switch brachium pontis the second link C between the 5th power switch S5 emitter and the second power switch S2 collector electrode;
Described two switch bridge arm circuit (3) are connected between the dc bus positive terminal "+" and dc bus negative pole end "-" of photovoltaic array output DC volt circuit (1) after being connected by the 3rd power switch S3 and the 4th power switch S4 forward, draw two switch brachium pontis link B between the 3rd power switch S3 emitter and the 4th power switch S4 collector electrode;
Described to fly across switch (4) be the 6th power switch S6, and the current collection of described the 6th power switch S6 very flies very to fly across switch the second link G across switch the first link D and emission;
Described three switch brachium pontis the first link A are connected with filtering parallel network circuit the first link E, described three switch brachium pontis the second link C with fly to be connected across switch the second link G, described two switch brachium pontis link B, filtering parallel network circuit the second link F are connected across switch the first link D with flying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205494998U CN202930969U (en) | 2012-10-24 | 2012-10-24 | Single-phase photovoltaic grid-connected power generation inverter circuit capable of reducing earth leakage current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205494998U CN202930969U (en) | 2012-10-24 | 2012-10-24 | Single-phase photovoltaic grid-connected power generation inverter circuit capable of reducing earth leakage current |
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| CN202930969U true CN202930969U (en) | 2013-05-08 |
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| CN2012205494998U Expired - Fee Related CN202930969U (en) | 2012-10-24 | 2012-10-24 | Single-phase photovoltaic grid-connected power generation inverter circuit capable of reducing earth leakage current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312205A (en) * | 2013-06-28 | 2013-09-18 | 石家庄通合电子科技股份有限公司 | Non-transformer single-phase grid-connected inverter control method |
| CN107204719A (en) * | 2017-04-11 | 2017-09-26 | 江苏大学 | It is used for the inverter topology circuit and its control method for suppressing leakage current in photovoltaic parallel in system |
-
2012
- 2012-10-24 CN CN2012205494998U patent/CN202930969U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312205A (en) * | 2013-06-28 | 2013-09-18 | 石家庄通合电子科技股份有限公司 | Non-transformer single-phase grid-connected inverter control method |
| CN107204719A (en) * | 2017-04-11 | 2017-09-26 | 江苏大学 | It is used for the inverter topology circuit and its control method for suppressing leakage current in photovoltaic parallel in system |
| CN107204719B (en) * | 2017-04-11 | 2019-10-01 | 江苏大学 | For inhibiting the inverter topology circuit and its control method of leakage current in photovoltaic parallel in system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20151024 |
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| EXPY | Termination of patent right or utility model |