CN102916445B - Single-phase grid-connected photovoltaic power generating device capable of inhibiting common mode current - Google Patents
Single-phase grid-connected photovoltaic power generating device capable of inhibiting common mode current Download PDFInfo
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- CN102916445B CN102916445B CN201210411602.7A CN201210411602A CN102916445B CN 102916445 B CN102916445 B CN 102916445B CN 201210411602 A CN201210411602 A CN 201210411602A CN 102916445 B CN102916445 B CN 102916445B
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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 discloses a single-phase grid-connected photovoltaic power generating device capable of inhibiting common mode current. The single-phase grid-connected photovoltaic power generating device is used for being connected between a photovoltaic array output direct-current voltage circuit and a filter grid-connected circuit and composed of a three-switch bridge arm circuit, a two-switch bridge arm circuit and a flying switch. The device is unlikely to overlap high-frequency interference in the photovoltaic array output direct current voltage and capable of effectively inhibiting the high-frequency common mode current.
Description
Technical field
The invention belongs to solar photovoltaic technology field, be specifically related to a kind of single-phase photovoltaic grid-connected Blast Furnace Top Gas Recovery Turbine Unit (TRT) that suppresses common mode current.
Background technology
Along with the continuous consumption of the fossil energies such as oil, coal, natural gas, energy problem is outstanding day by day.Solar energy reserves are extremely abundant, and utilize the generation technology of solar energy to make rapid progress, so solar power generation has obtained extensive approval both domestic and external.Monolithic solar panel output voltage is low, so generally need polylith solar panel to carry out connection in series-parallel, forms photovoltaic array.Yet photovoltaic array floor space is larger, under moist environment, parasitic capacitance is larger over the ground for photovoltaic array.The direct current that photovoltaic array is produced becomes single-phase alternating current that can be grid-connected, need to could realize through combining inverter.In order to improve combining inverter efficiency, the non-isolation inverter circuit of general employing, therefore the component of voltage that on the direct voltage that the switching process of power device produces at photovoltaic array, possibility overlapped high-frequency changes, the photovoltaic array component of voltage that parasitic capacitance changes high frequency is over the ground very responsive, thereby cause in parasitic capacitance, producing common mode current over the ground, this high frequency common mode current has a strong impact on equipment itself and personal safety generation, therefore European Union member countries have formulated strict standard to common mode current size, require single-phase non-isolated grid-connected power-generation inversion device must there is the measure that suppresses common mode current.
Summary of the invention
The object of this invention is to provide a kind of single-phase photovoltaic grid-connected Blast Furnace Top Gas Recovery Turbine Unit (TRT) that suppresses common mode current, can in the direct voltage of photovoltaic array output, not disturb by overlapped high-frequency, can effectively suppress high frequency common mode current.
The technical solution adopted in the present invention is, a kind of single-phase photovoltaic grid-connected Blast Furnace Top Gas Recovery Turbine Unit (TRT) that suppresses common mode current, it is characterized in that, be used for being connected between photovoltaic array output dc voltage 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 voltage circuit has DC bus positive terminal "+" and DC bus negative pole end "-", and 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 voltage circuit after forward series connection successively by the first power switch S1, the 5th power switch S5 and the second power switch S2 switch, between the first power switch S1 emitter and the 5th power switch S5 collector electrode, draw three switch brachium pontis the first link A, between the 5th power switch S5 emitter and the second power switch S2 collector electrode, draw three switch brachium pontis the second link C;
Two switch bridge arm circuit are connected between the DC bus positive terminal "+" and DC bus negative pole end "-" of photovoltaic array output dc voltage 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 across switch the first link D, and its transmitting very flies across switch the second link G;
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 present invention suppresses the single-phase photovoltaic grid-connected Blast Furnace Top Gas Recovery Turbine Unit (TRT) of common mode current is: realized converting the direct voltage of photovoltaic array output to alternating current and carry out grid-connected inverse method, have that hardware cost is moderate, high efficiency, transless isolation, control simple advantage, in the direct voltage that simultaneously can not export at photovoltaic array, overlapped high-frequency disturbs, thereby effectively suppresses the size of common mode current.
Accompanying drawing explanation
Fig. 1 is the module frame chart that the present invention suppresses the single-phase photovoltaic grid-connected Blast Furnace Top Gas Recovery Turbine Unit (TRT) of common mode current;
Fig. 2 is the circuit connection diagram that the present invention suppresses the single-phase photovoltaic grid-connected Blast Furnace Top Gas Recovery Turbine Unit (TRT) of common mode current;
Wherein, PV represents photovoltaic array, D1 represents anti-reverse charging power diode, C1 represents DC bus filter capacitor, "+" represents DC bus positive terminal, "-" represents 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 voltage circuit, 2. three switch bridge arm circuit, 3. liang switch bridge arm circuit, 4. flies across switch, 5. filtering parallel network circuit.
Embodiment
As depicted in figs. 1 and 2, the present invention suppresses the single-phase photovoltaic grid-connected Blast Furnace Top Gas Recovery Turbine Unit (TRT) of common mode current, be used for being connected between photovoltaic array output dc voltage 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 voltage 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 voltage 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 voltage circuit 1 after forward series connection successively by the first power switch S1, the 5th power switch S5 and the second power switch S2 switch, between the first power switch S1 emitter and the 5th power switch S5 collector electrode, draw three switch brachium pontis the first link A, between the 5th power switch S5 emitter and the second power switch S2 collector electrode, draw three switch brachium pontis the second link C.
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 voltage 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 transmitting.
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 invention is:
1) be connected to the first power switch S1 and 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 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 while 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 while being 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 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, the 3rd power switch 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 PWM mode simultaneously.
When the first power switch S1 and the 4th power switch S4 open simultaneously, the electric current that photovoltaic array PV produces flows 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.
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, now between photovoltaic array and single-phase electrical network, there is no electric connecting relation, thereby avoided high frequency voltage component to appear on DC bus, so high frequency common mode current has obtained effective inhibition.
3) during line voltage negative half period, the 5th power switch S5 conducting always, the first power switch S1, 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 PWM mode simultaneously.
When the second power switch S2 and the 3rd power switch S3 open simultaneously, the electric current that photovoltaic array produces flows 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, merit the 5th rate switch S 5 and the second power switch S2.
When the second power switch S2 and the 3rd power switch S3 turn-off simultaneously, electric current on circuit carries 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, now cut off the electrical connection between photovoltaic array PV and single-phase electrical network, thereby also avoided high frequency voltage component to appear on DC bus, so now high frequency common mode current has also obtained effective inhibition.
Claims (1)
1. a single-phase photovoltaic grid-connected Blast Furnace Top Gas Recovery Turbine Unit (TRT) that suppresses common mode current, it is characterized in that, be used for being connected between photovoltaic array output dc voltage 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 voltage 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 voltage circuit (1) after forward series connection successively by the first power switch S1, the 5th power switch S5 and the second power switch S2 switch, between the first power switch S1 emitter and the 5th power switch S5 collector electrode, draw three switch brachium pontis the first link A, between the 5th power switch S5 emitter and the second power switch S2 collector electrode, draw three switch brachium pontis the second link C;
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 voltage 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 transmitting;
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;
The first power switch S1 to the six power switch S6 are power MOSFET.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210411602.7A CN102916445B (en) | 2012-10-24 | 2012-10-24 | Single-phase grid-connected photovoltaic power generating device capable of inhibiting common mode current |
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| CN201210411602.7A CN102916445B (en) | 2012-10-24 | 2012-10-24 | Single-phase grid-connected photovoltaic power generating device capable of inhibiting common mode current |
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| CN102916445A CN102916445A (en) | 2013-02-06 |
| CN102916445B true CN102916445B (en) | 2014-12-10 |
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| CN104967350A (en) * | 2015-07-20 | 2015-10-07 | 安徽大学 | High-efficiency H7-type single-phase non-isolated grid-connected inverter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1369985A2 (en) * | 2002-05-15 | 2003-12-10 | Frauenhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Inverter for transforming a DC voltage into an AC current or an AC voltage |
| CN202424566U (en) * | 2012-02-02 | 2012-09-05 | 西安理工大学 | Single-phase unfenced photovoltaic grid-connected inverted circuit |
| CN102664543A (en) * | 2012-03-09 | 2012-09-12 | 深圳市汇川技术股份有限公司 | Full-bridge grid-connected inverter circuit and control method thereof |
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- 2012-10-24 CN CN201210411602.7A patent/CN102916445B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1369985A2 (en) * | 2002-05-15 | 2003-12-10 | Frauenhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Inverter for transforming a DC voltage into an AC current or an AC voltage |
| CN202424566U (en) * | 2012-02-02 | 2012-09-05 | 西安理工大学 | Single-phase unfenced photovoltaic grid-connected inverted circuit |
| CN102664543A (en) * | 2012-03-09 | 2012-09-12 | 深圳市汇川技术股份有限公司 | Full-bridge grid-connected inverter circuit and control method thereof |
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Inventor after: Zhao Haidong Inventor after: Wu Chao Inventor before: Zhang Qi Inventor before: Sun Xiangdong Inventor before: Ren Biying Inventor before: An Shaoliang Inventor before: Yang Hui |
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Effective date of registration: 20170914 Address after: 010051, the Inner Mongolia Autonomous Region, Hohhot, Saihan, west of Exhibition Road West, Xinhua East Street, South China City Plaza, office building A, Room 502 Patentee after: Inner Mongolia Zhong Yue Electric Power Co., Ltd. Address before: 710048 Shaanxi city of Xi'an Province Jinhua Road No. 5 Patentee before: Xi'an University of Technology |
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