CN102916445A - 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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- CN102916445A CN102916445A CN2012104116027A CN201210411602A CN102916445A CN 102916445 A CN102916445 A CN 102916445A CN 2012104116027 A CN2012104116027 A CN 2012104116027A CN 201210411602 A CN201210411602 A CN 201210411602A CN 102916445 A CN102916445 A CN 102916445A
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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 the 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.The 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, forms photovoltaic array so generally need the polylith solar panel to carry out connection in series-parallel.Yet the photovoltaic array floor space is larger, and parasitic capacitance is larger over the ground for photovoltaic array under the environment of humidity.The direct current that photovoltaic array is produced becomes the single-phase alternating current that can be incorporated into the power networks, and needs could realize through combining inverter.In order to improve combining inverter efficient, the non-isolation inverter circuit of general employing, so the switching process of power device component of voltage that the possibility overlapped high-frequency changes on the direct voltage that photovoltaic array produces, photovoltaic array over the ground parasitic capacitance is very responsive to the component of voltage that high frequency changes, thereby cause producing common mode current in parasitic capacitance 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 the common mode current size, require single-phase non-isolated grid-connected power-generation inversion device must have the measure that suppresses common mode current.
Summary of the invention
The purpose 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 carry out establishment to 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 volt circuit and the filtering parallel network circuit, this device comprises three switch bridge arm circuit, two switch bridge arm circuit and flies to stride 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, 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 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 to stride switch is the 6th power switch S6, and the current collection of the 6th power switch S6 very flies to stride switch the first link D, and its emission very flies to stride switch the second link G;
Three switch brachium pontis the first link A is connected with filtering parallel network circuit the first link E, three switch brachium pontis the second link C with fly to stride switch the second link G and be connected, two switch brachium pontis link B, filtering parallel network circuit the second link F with fly to stride switch the first link D and be connected.
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 inverse method that alternating current is incorporated into the power networks, have that hardware cost is moderate, high efficiency, transless isolation, control simple advantage, can in the direct voltage of photovoltaic array output, not disturb by overlapped high-frequency simultaneously, thus the size of establishment common mode current.
Description of drawings
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 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, and A and C represent respectively three switch brachium pontis the first link and three switch brachium pontis the second link, and B represents two switch brachium pontis links, D and G represent respectively to fly to stride switch the first link and fly to stride switch the second link, and 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. flies to stride switch, 5. the 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 volt circuit 1 and the filtering parallel network circuit 5, this device comprises three switch bridge arm circuit 2, two switch bridge arm circuit 3 and flies to stride 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, 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 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 to stride switch 4 is the 6th power switch S6, and the current collection of the 6th power switch S6 very flies to stride switch the first link D and emission very flies to stride switch the second link G.
Three switch brachium pontis the first link A is connected with filtering parallel network circuit the first link E, three switch brachium pontis the second link C with fly to stride switch the second link G and be connected, two switch brachium pontis link B, filtering parallel network circuit the second link F with fly to stride switch the first link D and be connected.
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) is 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 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 then with single-phase mains frequency for example the low frequency signal of 50Hz trigger, wherein, always conducting when the 6th power switch S6 is the positive half cycle of line voltage, always conducting when the 5th power switch S5 is the line voltage negative half period.
2) during the positive half cycle of line voltage, the 6th always conducting of power switch S6, 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 the PWM mode simultaneously.
When the first power switch S1 and the 4th power switch S4 opened simultaneously, the electric current that photovoltaic array PV 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.
When the first power switch S1 and the 4th power switch S4 turn-off simultaneously, electric current on the 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, do not have electric connecting relation between photovoltaic array and the single-phase electrical network this moment, thereby avoided the high frequency voltage component to appear on the dc bus, so high frequency common mode current has obtained establishment.
3) during the line voltage negative half period, the 5th always conducting of power switch S5, 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 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, 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 the 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, cut off the electrical connection between photovoltaic array PV and the single-phase electrical network this moment, thereby also avoided the high frequency voltage component to appear on the dc bus, so this moment, high frequency common mode current also obtained establishment.
Claims (1)
1. 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 volt circuit (1) and the filtering parallel network circuit (5), this device comprises three switch bridge arm circuit (2), two switch bridge arm circuit (3) and flies to stride 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, 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 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 to stride switch (4) be the 6th power switch S6, and the current collection of described the 6th power switch S6 very flies to stride switch the first link D and emission very flies to stride switch the second link G;
Described three switch brachium pontis the first link A is connected with filtering parallel network circuit the first link E, described three switch brachium pontis the second link C with fly to stride switch the second link G and be connected, described two switch brachium pontis link B, filtering parallel network circuit the second link F with fly to stride switch the first link D and be connected.
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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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| 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 true CN102916445A (en) | 2013-02-06 |
| CN102916445B CN102916445B (en) | 2014-12-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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
- 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967350A (en) * | 2015-07-20 | 2015-10-07 | 安徽大学 | High-efficiency H7-type single-phase non-isolated grid-connected inverter |
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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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