CN201490725U - Buffer grid-connected circuit for transformer of photovoltaic grid-connected inverter - Google Patents
Buffer grid-connected circuit for transformer of photovoltaic grid-connected inverter Download PDFInfo
- Publication number
- CN201490725U CN201490725U CN2009201873175U CN200920187317U CN201490725U CN 201490725 U CN201490725 U CN 201490725U CN 2009201873175 U CN2009201873175 U CN 2009201873175U CN 200920187317 U CN200920187317 U CN 200920187317U CN 201490725 U CN201490725 U CN 201490725U
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- Prior art keywords
- transformer
- contactor
- auxiliary
- grid
- buffer
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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 relates to a buffer grid-connected circuit for a transformer of a photovoltaic grid-connected inverter. The transformer is connected in series with an electric network through a main AC contactor; the main AC contactor is connected with a control circuit; at least one auxiliary AC contactor and at least one buffer resistance are connected in parallel between the secondary side of the transformer and the electric network; and the auxiliary AC contactor is connected in series with the buffer resistance and connected with the control circuit. The utility model can avoid great impact current caused by the transformer of the photovoltaic grid-connected inverter, and effectively protect the transformer.
Description
Technical field
The utility model relates to a kind of grid-connected circuit, is applicable to that mainly AC side comprises the photovoltaic combining inverter system buffer parallel network circuit of isolating transformer.
Background technology
The photovoltaic combining inverter of band power frequency isolating transformer is when being incorporated into the power networks at present, generally be after the condition of being incorporated into the power networks satisfies, contactor (or relay) with regard to adhesive AC side immediately, making AC side insert electrical network begins to generate electricity by way of merging two or more grid systems: this control mode that directly is incorporated into the power networks, cause damage for the isolating transformer of AC side, because transformer needs to set up magnetic field before putting into operation, this realizes by drawing exciting current, and above-described control mode, allow transformer moment after system start-up draw bigger exciting current from AC side, cause energy loss on the one hand, on the other hand when line voltage and transformer secondary side voltage amplitude when phasic difference is big mutually, can produce very big impulse current, thereby damage transformer.
The utility model content
The utility model has proposed a kind of very big impulse current of avoiding producing in order to improve the shortcoming of prior art, effectively protects the transformer buffering parallel network circuit of the photovoltaic combining inverter of transformer.
The utility model is achieved through the following technical solutions:
A kind of transformer buffering parallel network circuit that is used for photovoltaic combining inverter, transformer is connected with electrical network by main A.C. contactor, main A.C. contactor is connected with control circuit, between the primary side and electrical network of transformer, at least one auxiliary A.C. contactor in parallel and at least one buffer resistance, auxiliary A.C. contactor is connected with buffer resistance; Auxiliary A.C. contactor is connected with described control circuit.
The utility model is between the primary side and electrical network of transformer, auxiliary A.C. contactor in parallel, auxiliary A.C. contactor is connected with buffer resistance, after other conditions that are incorporated into the power networks satisfy, at first closed auxiliary A.C. contactor, the buffer resistance that this moment, exciting current was subjected to connect on this branch road is restricted to a smaller value, the damage of having avoided big impulse current that transformer is caused, when auxiliary contactor after closed a period of time, main A.C. contactor closure, auxiliary contactor disconnects, and inverter begins formally to generate electricity by way of merging two or more grid systems.From as can be seen above-mentioned, being compared to common inverter is incorporated into the power networks, this interconnection technology at first by auxiliary contactor and the big exciting current of buffering resistance limits to the damage that AC transformer causes, avoided the impact of big exciting current, improved the reliability of system.
Description of drawings
Accompanying drawing is an electrical block diagram.
Embodiment
Shown in accompanying drawing.
Transformer 1 in the utility model inverter 2 is connected with electrical network 4 by main A.C. contactor 3, transformer 1 and main A.C. contactor 3 be three-phase, main A.C. contactor 3 is connected with control circuit 5, between the primary side and electrical network 4 of transformer 1, whenever be in parallel an auxiliary A.C. contactor 7 and a buffer resistance 6, auxiliary A.C. contactor 7 is connected with buffer resistance 6; Auxiliary A.C. contactor 7 is connected with control circuit 5.
After other conditions that are incorporated into the power networks satisfy, at first closed auxiliary A.C. contactor 7, the buffer resistance 6 that this moment, exciting current was subjected to connect on this branch road is restricted to a smaller value, the damage of having avoided big impulse current that transformer 1 is caused, when auxiliary A.C. contactor after 7 closed a period of times, main A.C. contactor 3 closures, auxiliary A.C. contactor 7 disconnects, and inverter 2 beginnings are formally generated electricity by way of merging two or more grid systems.
Claims (1)
1. a transformer that is used for photovoltaic combining inverter cushions parallel network circuit, transformer is connected with electrical network by main A.C. contactor, main A.C. contactor is connected with control circuit, it is characterized in that between the primary side and electrical network of transformer, at least one auxiliary A.C. contactor in parallel and at least one buffer resistance, auxiliary A.C. contactor is connected with buffer resistance; Auxiliary A.C. contactor is connected with described control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201873175U CN201490725U (en) | 2009-09-01 | 2009-09-01 | Buffer grid-connected circuit for transformer of photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201873175U CN201490725U (en) | 2009-09-01 | 2009-09-01 | Buffer grid-connected circuit for transformer of photovoltaic grid-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201490725U true CN201490725U (en) | 2010-05-26 |
Family
ID=42429592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201873175U Expired - Lifetime CN201490725U (en) | 2009-09-01 | 2009-09-01 | Buffer grid-connected circuit for transformer of photovoltaic grid-connected inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201490725U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780414A (en) * | 2012-01-13 | 2012-11-14 | 广东志成冠军集团有限公司 | Device and method for inhibiting inrush starting current for large-power grid-connected inverter |
| CN102832842A (en) * | 2012-08-31 | 2012-12-19 | 广东明阳龙源电力电子有限公司 | Novel three-phase photovoltaic grid-connected inverter system |
| CN103036446A (en) * | 2011-09-30 | 2013-04-10 | 艾默生网络能源有限公司 | Soft starting device and method for high-power transformer |
| CN103312139A (en) * | 2012-03-09 | 2013-09-18 | 台达电子工业股份有限公司 | Starting device of grid-connected inverter and control method thereof |
| CN104065051B (en) * | 2014-06-26 | 2017-06-13 | 许继电气股份有限公司 | A kind of transformer inrush current suppression apparatus suitable for the frequent unloaded input of testing transformer |
| CN107069686A (en) * | 2017-03-24 | 2017-08-18 | 江苏固德威电源科技股份有限公司 | Grid-connected moment impact current suppressing circuit and apply its photovoltaic inversion system |
| CN114566953A (en) * | 2022-02-28 | 2022-05-31 | 漳州科华电气技术有限公司 | Buffer circuit and grid-connected system |
| US11791719B2 (en) | 2019-01-28 | 2023-10-17 | Huawei Digital Power Technologies Co., Ltd. | Device, method, and system for resolving common-mode voltage interference |
-
2009
- 2009-09-01 CN CN2009201873175U patent/CN201490725U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036446A (en) * | 2011-09-30 | 2013-04-10 | 艾默生网络能源有限公司 | Soft starting device and method for high-power transformer |
| CN102780414A (en) * | 2012-01-13 | 2012-11-14 | 广东志成冠军集团有限公司 | Device and method for inhibiting inrush starting current for large-power grid-connected inverter |
| CN102780414B (en) * | 2012-01-13 | 2014-12-24 | 广东志成冠军集团有限公司 | Device and method for inhibiting inrush starting current for large-power grid-connected inverter |
| CN103312139A (en) * | 2012-03-09 | 2013-09-18 | 台达电子工业股份有限公司 | Starting device of grid-connected inverter and control method thereof |
| CN103312139B (en) * | 2012-03-09 | 2016-05-11 | 台达电子工业股份有限公司 | A kind of starting drive of combining inverter and control method thereof |
| CN102832842A (en) * | 2012-08-31 | 2012-12-19 | 广东明阳龙源电力电子有限公司 | Novel three-phase photovoltaic grid-connected inverter system |
| CN104065051B (en) * | 2014-06-26 | 2017-06-13 | 许继电气股份有限公司 | A kind of transformer inrush current suppression apparatus suitable for the frequent unloaded input of testing transformer |
| CN107069686A (en) * | 2017-03-24 | 2017-08-18 | 江苏固德威电源科技股份有限公司 | Grid-connected moment impact current suppressing circuit and apply its photovoltaic inversion system |
| US11791719B2 (en) | 2019-01-28 | 2023-10-17 | Huawei Digital Power Technologies Co., Ltd. | Device, method, and system for resolving common-mode voltage interference |
| CN114566953A (en) * | 2022-02-28 | 2022-05-31 | 漳州科华电气技术有限公司 | Buffer circuit and grid-connected system |
| CN114566953B (en) * | 2022-02-28 | 2023-08-18 | 漳州科华电气技术有限公司 | Buffer circuit and grid-connected system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HEFEI SUNGROW POWER SUPPLY CO., LTD. Free format text: FORMER NAME: HEFEI SUNLIGHT POWER SUPPLY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Patentee after: SUNGROW POWER SUPPLY Co.,Ltd. Address before: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Patentee before: Hefei sunshine power Limited by Share Ltd. Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Patentee after: Hefei sunshine power Limited by Share Ltd. Address before: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Patentee before: Hefei Sungrow Power Supply Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100526 |
|
| CX01 | Expiry of patent term |