CN103337874A - Photovoltaic power generation system, and voltage compensation device and converter applicable to same - Google Patents
Photovoltaic power generation system, and voltage compensation device and converter applicable to same Download PDFInfo
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- CN103337874A CN103337874A CN2013102320141A CN201310232014A CN103337874A CN 103337874 A CN103337874 A CN 103337874A CN 2013102320141 A CN2013102320141 A CN 2013102320141A CN 201310232014 A CN201310232014 A CN 201310232014A CN 103337874 A CN103337874 A CN 103337874A
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Abstract
A photovoltaic power generation system comprises at least one converter, a solar cell serial and a three-phase insulating transformer, wherein the converter is provided with a direct current input end and an alternating current output end, the solar cell serial is in electric connection with a direct current input end of the converter correspondingly, alternating current output ends of the converters are connected in parallel, the solar cell serial comprises at least one solar cell panel, the three-phase insulating transformer comprises a primary side and a secondary side, the primary side is in electric connection with the alternating output end of the converter, the photovoltaic power generation system further comprises a neutral line device and a voltage compensation device, a first end of the neutral line device and the alternating output end of the converter are in electric connection with the primary side of the three-phase insulating transformer, the voltage compensation device is connected between a second end of the neutral line device and the ground, and the electric potential of the second end of the neutral line device is controlled through the control to output voltage of the voltage compensation device. The problem that component performance is reduced due to PID can be solved, and the scheme is simple and feasible.
Description
Technical field
The application relates to the photovoltaic power generation technology field, and particularly a kind of electromotive force that solves is induced the voltage compensating device of decay, current transformer and photovoltaic generating system.
Background technology
Electromotive force induces decay (PID, Potential Induced Degradation) to refer to: because high pressure is applied on the cell panel and phenomenon that its performance is reduced over the ground.According to different cell panel characteristics, this high pressure may be positive voltage, also may be negative voltage.
The phenomenon that PID causes the cell panel performance to reduce is: open circuit voltage decline (Voc), breaking current (Isc) fill factor, curve factor (FF) be degradation down.
SUNPOWER company of the U.S. famous photovoltaic manufacturer finds, adopts backplane contact high-efficiency battery sheet A-300, specifically is to apply a high back voltage at assembly, and surperficial polarization phenomena take place.If apply positive voltage with respect to the earth at assembly, leakage current can flow to ground from battery immediately.The surface of battery can be along with the accumulated time negative electrical charge, and these electric charges can attract battery surface with positive charge, forms the complex centre.On the contrary, when applying negative voltage on the assembly, polarization phenomena are corresponding change also, and the performance of assembly can be not influential in this case.
In recent years, along with the continuous development of large-scale power station, mainly be the power station near the coastal area, these regional environmental conditions are more abominable, for example, high temperature, high humidity etc.Along with the prolongation of time, the PID problem is more and more serious.
The photovoltaic generating system that is connected electrical network for the three-phase alternating current output of current transformer by three phase isolated transformer (transformer has the neutral terminal on primary side, primary side and the primary side), can solve the PID problem by the neutral terminal current potential of (PE) over the ground of transformer in the control electricity generation system.But owing to contain a plurality of current transformers in this type of photovoltaic generating system, each current transformer needs to draw a N line and links to each other with the neutral terminal of three phase isolated transformer, increase system cost and line loss, and increased the wiring complexity, and can reduce system reliability.And at the photovoltaic generating system of the transformer that does not possess neutral terminal, this scheme is inapplicable.
Therefore, the problem that the performance that the solution electromotive force induces decay to bring to assembly descends is those skilled in the art's technical issues that need to address.
Summary of the invention
The technical problem that the application will solve provides a kind of electromotive force that solves and induces the voltage compensating device of decay, current transformer and photovoltaic generating system, can solve the assembly property decline problem that PID causes.
The application provides a kind of photovoltaic generating system, comprise that at least one has the current transformer of direct-flow input end and ac output end, the corresponding solar cell tandem that is electrically connected of direct-flow input end with described current transformer, the three phase isolated transformer, the ac output end parallel connection of described current transformer, described solar cell tandem comprises at least one solar panel, described three phase isolated transformer comprises primary side and primary side, the ac output end of described primary side and current transformer is electrically connected, described photovoltaic generating system also comprises: neutral line device, and the primary side of first end of described neutral line device and the ac output end of described current transformer and described three phase isolated transformer is electrically connected; Voltage compensating device, described voltage compensating device are connected between second end and ground of described neutral line device, control the current potential of second end of described neutral line device by the output voltage of controlling described voltage compensating device.
Further, described neutral line device comprises three non-polar electric capacity, and an end of described electric capacity links together as second end of described neutral line device, and the other end of described electric capacity is connected with three of the ac output end of described current transformer respectively.
Further, described neutral line device comprises three resistance, and an end of described resistance links together as second end of described neutral line device, and the other end of described resistance is connected with three of the ac output end of described current transformer respectively.
Further, described voltage compensating device comprises: input unit, be used for from the power taking of described solar cell tandem, perhaps, from three phase isolated transformer primary or primary side power taking; Voltage transformation module, the voltage that is used for described input unit is obtained carries out sending to output unit after the conversion; Output unit, described output unit is connected with second end of described neutral line device, is used for the voltage of described voltage transformation module conversion is fed back to the current potential that second of described neutral line device is brought in second end of control neutral line device.
Further, described input unit is from primary side or the primary side power taking of three phase isolated transformer, and described voltage transformation module comprises three-phase main-frequency transformer, rectifier bridge, a DC/DC converter; The primary side of described three-phase main-frequency transformer connects primary side or the primary side of three phase isolated transformer, described rectifier bridge is connected between the input of the primary side of three-phase main-frequency transformer and a DC/DC converter, described rectifier bridge is used for alternating current with the primary side of three-phase main-frequency transformer and converts direct current to and offer a DC/DC converter, and the output of a described DC/DC converter links to each other with second end of neutral line device.
Further, described input unit is specially from three phase isolated transformer primary or primary side power taking:
Input unit is from line voltage or the phase voltage power taking of three phase isolated transformer primary; Or input unit is from line voltage or the phase voltage power taking of three phase isolated transformer secondary.
Further, described input unit is from the power taking of described solar cell tandem, described voltage transformation module comprises the 2nd DC/DC converter, the input of described the 2nd DC/DC converter links to each other with described solar cell tandem, and the output of described the 2nd DC/DC converter links to each other with second end of neutral line device.
Further, described voltage compensating device be described at least one have the part of any current transformer in the current transformer of direct-flow input end and ac output end.
The application also provides a kind of voltage compensating device, and is consistent with the voltage compensating device in the above-mentioned photovoltaic generating system.
The application also provides a kind of current transformer that is applied to above-mentioned photovoltaic generating system, comprises above-mentioned voltage compensating device.
Compared with prior art, the application has the following advantages:
The photovoltaic generating system that the application provides comprises neutral line device and voltage compensating device, and the primary side of the ac output end of current transformer and three phase isolated transformer is electrically connected in first end of described neutral line device and the photovoltaic generating system; Described voltage compensating device is connected between second end and ground of described neutral line device, controls the current potential of described neutral line device by the output voltage of controlling described voltage compensating device.Compared with prior art, voltage compensating device and current transformer that the application provides are worked simultaneously, control the current potential of neutral line device by the output voltage of control voltage compensating device, avoiding many current transformers all need draw the N line links to each other with the neutral terminal of three phase isolated transformer, thereby lowered system cost and line loss, scheme is simple; And be applicable to the photovoltaic generating system of the transformer that does not possess neutral terminal.When containing a plurality of current transformer in the photovoltaic generating system, only need at the ac output end of a current transformer this neutral line device and voltage compensating device to be set, can reach the PID influence that all current transformers in the elimination system connect photovoltaic group string, thus the useful life of all photovoltaic modulies in the raising system.
Description of drawings
Fig. 1 is photovoltaic generating system embodiment one schematic diagram that the application provides;
Fig. 2 a is photovoltaic generating system embodiment two schematic diagrames that the application provides;
Fig. 2 b is photovoltaic generating system embodiment three schematic diagrames that the application provides;
Fig. 3 is the schematic diagram of the voltage compensating device embodiment that provides of the application;
Fig. 4 a is the schematic diagram of the voltage transformation module embodiment that provides of the application;
Fig. 4 b is another schematic diagram of the voltage transformation module embodiment that provides of the application;
Fig. 4 c is the schematic diagram of the voltage compensating device way to take power that provides of the application.
Embodiment
For above-mentioned purpose, the feature and advantage that make the application can become apparent more, be described in detail below in conjunction with the embodiment of accompanying drawing to the application.
Referring to Fig. 1, this figure is photovoltaic generating system embodiment one schematic diagram that the application provides.
Present embodiment provides a kind of photovoltaic generating system, comprise at least one current transformer with direct-flow input end and ac output end 120, the corresponding solar cell tandem 110 that is electrically connected of direct-flow input end with described current transformer 120, three phase isolated transformer 130, neutral line device 150 and voltage compensating device 140, the ac output end parallel connection of described current transformer 120, described solar cell tandem 110 comprises at least one solar panel, described three phase isolated transformer 130 comprises primary side 131 and primary side 132, described primary side 131 is electrically connected with the ac output end of current transformer, the primary side 131 of first end of described neutral line device 150 and the ac output end of described current transformer 120 and described three phase isolated transformer 130 is electrically connected, described voltage compensating device 140 is connected between second end and ground of described neutral line device 150, controls the current potential of second end of described neutral line device 150 by the output voltage of controlling described voltage compensating device 140.
The photovoltaic generating system that the application provides comprises neutral line device and voltage compensating device, and the primary side of the ac output end of current transformer and three phase isolated transformer is electrically connected in first end of described neutral line device and the photovoltaic generating system; Second end of described voltage compensating device and described neutral line device is electrically connected, and controls the current potential of described neutral line device by the output voltage of controlling described voltage compensating device.Compared with prior art, voltage compensating device and current transformer that the application provides are worked simultaneously, control the current potential of neutral line device by the output voltage of control voltage compensating device, avoiding many current transformers all need draw the N line links to each other with the neutral terminal of three phase isolated transformer, thereby lowered system cost and line loss, scheme is simple; And be applicable to the photovoltaic generating system of the transformer that does not possess neutral terminal.
When containing a plurality of current transformer in the photovoltaic generating system, only need at the ac output end of a current transformer this neutral line device and voltage compensating device to be set, can reach the PID influence that all current transformers in the elimination system connect photovoltaic group string, thus the useful life of all photovoltaic modulies in the raising system.
Referring to Fig. 2 a, this figure is photovoltaic generating system embodiment two schematic diagrames that the application provides, and compares with above-described embodiment one, further, neutral line device 150 comprises three non-polar electric capacity, and an end of described electric capacity links together as second end of described neutral line device 150; The other end of electric capacity is connected with three of the ac output end of described current transformer respectively.
Referring to Fig. 2 b, this figure is photovoltaic generating system embodiment three schematic diagrames that the application provides, and compares with above-described embodiment one, further, neutral line device 150 comprises three resistance, and an end of described resistance links together as second end of described neutral line device 150; The other end of resistance is connected with three of the ac output end of described current transformer respectively.
By utilizing electric capacity or resistance constructing system neutral terminal, scheme is simple, avoids many current transformers all need draw the N line and links to each other with the neutral terminal of three phase isolated transformer, thereby lowered system cost and line loss; And at the system of the transformer that does not possess neutral terminal, same being suitable for.
Further, see also Fig. 3, voltage compensating device 140 comprises input unit 1402, voltage transformation module 1404 and output unit 1406;
Described input unit 1402 is used for from 110 power takings of solar cell tandem, perhaps, and from primary side 131 or primary side 132 power takings of three phase isolated transformer 130;
Further, described input unit 1402 is specially from primary side 131 or primary side 132 power takings of three phase isolated transformer 130: input unit 1402 is from line voltage or the phase voltage power taking of the primary side 131 of three phase isolated transformer 130; Or input unit 1402 is from line voltage or the phase voltage power taking of the primary side 132 of three phase isolated transformer 130.
Need to prove that input unit is during from the primary side of three phase isolated transformer or primary side power taking, what voltage transformation module 1404 can be for any kind is converted to alternating current galvanic circuit.
See also Fig. 4 a, this figure is the schematic diagram of the voltage transformation module embodiment that provides of the application.
Described voltage transformation module 1404 comprises three-phase main-frequency transformer 1404a, rectifier bridge 1404c, a DC/DC converter 1404b; The primary side of described three-phase main-frequency transformer 1404a connects primary side or the primary side of three phase isolated transformer, rectifier bridge 1404c is connected between the input of the primary side of three-phase main-frequency transformer 1404a and a DC/DC converter 1404b, be used for the AC rectification that primary side 131 or the primary side 132 of three phase isolated transformer 130 are obtained is become direct current, the output terminals A of a described DC/DC converter 1404b links to each other with second end of neutral line device 150.
Need to prove that input unit is during from the power taking of solar cell tandem, voltage transformation module 1404 can be the circuit that direct current is carried out the electric pressure conversion of any kind;
See also Fig. 4 b, this figure is another schematic diagram of the voltage transformation module embodiment that provides of the application.
Described input unit 1402 is from described solar cell tandem 110 power takings, described voltage transformation module 1404 comprises the 2nd DC/DC converter 1404d, the input of described the 2nd DC/DC converter 1404d links to each other with PV-with the PV+ of described solar cell tandem 110, and the output B of described the 2nd DC/DC converter 1404d links to each other with second end of neutral line device 150.
Referring to Fig. 4 c, this figure is the schematic diagram of voltage compensating device way to take power.
Need to prove, in above-described embodiment, voltage compensating device both can be used as autonomous device, also can be to have the part of any current transformer at least one current transformer of direct-flow input end and ac output end and this current transformer as an integral device.
The photovoltaic generating system that the application provides comprises neutral line device and voltage compensating device, and the primary side of the ac output end of current transformer and three phase isolated transformer is electrically connected in first end of described neutral line device and the photovoltaic generating system; Second end of described voltage compensating device and described neutral line device is electrically connected, and controls the current potential of described neutral line device by the output voltage of controlling described voltage compensating device, thereby solves the problem that performance that electromotive force induces decay to bring to assembly descends.When containing a plurality of current transformer in the photovoltaic generating system, only need at the ac output end of a current transformer this neutral line device and voltage compensating device to be set, can reach the PID influence that all current transformers in the elimination system connect photovoltaic group string, thus the useful life of all photovoltaic modulies in the raising system.
The application also provides the embodiment of voltage compensating device, corresponding to the voltage compensating device among the above-mentioned photovoltaic generating system embodiment.
The application also provides the embodiment of current transformer in the photovoltaic generating system, and this current transformer comprises the voltage compensating device in above-described embodiment.
Need to prove that neutral line device can be to have the part of any current transformer at least one current transformer of direct-flow input end and ac output end and this current transformer as an integral device.
Compared with prior art, voltage compensating device and current transformer that the application provides are worked simultaneously, control the current potential of neutral line device by the output voltage of control voltage compensating device, avoiding many current transformers all need draw the N line links to each other with the neutral terminal of three phase isolated transformer, thereby lowered system cost and line loss, scheme is simple.
The above only is the application's preferred embodiment, is not the application is done any pro forma restriction.Though this application has discloses as above with preferred embodiment, yet is not in order to limit the application.Any those of ordinary skill in the art, do not breaking away under the present techniques scheme scope situation, all can utilize method and the technology contents of above-mentioned announcement that the present techniques scheme is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from the present techniques scheme according to any simple modification, equivalent variations and the modification that the application's technical spirit is done above embodiment, all still belongs in the scope of present techniques scheme protection.
Claims (10)
1. photovoltaic generating system, comprise at least one have the current transformer of direct-flow input end and ac output end, with the corresponding solar cell tandem that is electrically connected of direct-flow input end, the three phase isolated transformer of described current transformer, the ac output end parallel connection of described current transformer, described solar cell tandem comprises at least one solar panel, described three phase isolated transformer comprises primary side and primary side, the ac output end of described primary side and current transformer is electrically connected, it is characterized in that described photovoltaic generating system also comprises:
Neutral line device, the primary side of first end of described neutral line device and the ac output end of described current transformer and described three phase isolated transformer is electrically connected;
Voltage compensating device, described voltage compensating device are connected between second end and ground of described neutral line device, control the current potential of second end of described neutral line device by the output voltage of controlling described voltage compensating device.
2. photovoltaic generating system according to claim 1, it is characterized in that, described neutral line device comprises three non-polar electric capacity, one end of described electric capacity links together as second end of described neutral line device, and the other end of described electric capacity is connected with three of the ac output end of described current transformer respectively.
3. photovoltaic generating system according to claim 1, it is characterized in that, described neutral line device comprises three resistance, and an end of described resistance links together as second end of described neutral line device, and the other end of described resistance is connected with three of the ac output end of described current transformer respectively.
4. according to each described photovoltaic generating system in the claim 1 to 3, it is characterized in that described voltage compensating device comprises:
Input unit is used for from the power taking of described solar cell tandem, perhaps, and from three phase isolated transformer primary or primary side power taking;
Voltage transformation module, the voltage that is used for described input unit is obtained carries out sending to output unit after the conversion;
Output unit, described output unit is connected with second end of described neutral line device, is used for the voltage of described voltage transformation module conversion is fed back to the current potential that second of described neutral line device is brought in second end of control neutral line device.
5. photovoltaic generating system according to claim 4 is characterized in that, described input unit is from primary side or the primary side power taking of three phase isolated transformer, and described voltage transformation module comprises three-phase main-frequency transformer, rectifier bridge, a DC/DC converter; The primary side of described three-phase main-frequency transformer connects primary side or the primary side of three phase isolated transformer, described rectifier bridge is connected between the input of the primary side of three-phase main-frequency transformer and a DC/DC converter, described rectifier bridge is used for alternating current with the primary side of three-phase main-frequency transformer and converts direct current to and offer a DC/DC converter, and the output of a described DC/DC converter links to each other with second end of neutral line device.
6. according to claim 4 or 5 described photovoltaic generating systems, it is characterized in that,
Described input unit is specially from three phase isolated transformer primary or primary side power taking:
Input unit is from line voltage or the phase voltage power taking of three phase isolated transformer primary;
Or,
Input unit is from line voltage or the phase voltage power taking of three phase isolated transformer secondary.
7. photovoltaic generating system according to claim 4, it is characterized in that, described input unit is from the power taking of described solar cell tandem, described voltage transformation module comprises the 2nd DC/DC converter, the input of described the 2nd DC/DC converter links to each other with described solar cell tandem, and the output of described the 2nd DC/DC converter links to each other with second end of neutral line device.
8. according to each described photovoltaic generating system in the claim 1 to 7, it is characterized in that, described voltage compensating device be described at least one have the part of any current transformer in the current transformer of direct-flow input end and ac output end.
9. one kind as each described voltage compensating device in the claim 1 to 8.
10. a current transformer that is applied to photovoltaic generating system comprises the described voltage compensating device of claim 9.
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| CN104065285A (en) * | 2014-03-31 | 2014-09-24 | 华为技术有限公司 | Grid-connected inverter system |
| CN104242811A (en) * | 2014-09-24 | 2014-12-24 | 彭书芳 | Photovoltaic power supply system |
| CN104917200A (en) * | 2015-05-29 | 2015-09-16 | 华为技术有限公司 | Photovoltaic grid-connected power generation system and usage method for the same |
| CN106786750A (en) * | 2016-12-27 | 2017-05-31 | 阳光电源股份有限公司 | Photovoltaic parallel in system and photovoltaic combining inverter |
| CN108063595A (en) * | 2017-12-29 | 2018-05-22 | 中节能太阳能科技哈密有限公司 | Photovoltaic module PID repairs circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104065285A (en) * | 2014-03-31 | 2014-09-24 | 华为技术有限公司 | Grid-connected inverter system |
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| CN111969646A (en) * | 2020-07-24 | 2020-11-20 | 华为技术有限公司 | Voltage compensation device, inverter and photovoltaic power generation system |
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Address after: 230088 Anhui city of Hefei province high tech Zone Xiyou Road No. 1699 Applicant after: Sun Grow Power Co., Ltd. Address before: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant before: Sun Grow Power Co., Ltd. |
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Denomination of invention: Photovoltaic power generation system, and voltage compensation device and converter applicable to same Effective date of registration: 20170627 Granted publication date: 20150520 Pledgee: Industrial Commercial Bank of China Ltd Hefei innovation Avenue Branch Pledgor: Sun Grow Power Co., Ltd. Registration number: 2017340000102 |