CN201774451U - Direct-current unloading circuit of double-fed wind power converter - Google Patents
Direct-current unloading circuit of double-fed wind power converter Download PDFInfo
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- CN201774451U CN201774451U CN2010205047764U CN201020504776U CN201774451U CN 201774451 U CN201774451 U CN 201774451U CN 2010205047764 U CN2010205047764 U CN 2010205047764U CN 201020504776 U CN201020504776 U CN 201020504776U CN 201774451 U CN201774451 U CN 201774451U
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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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The utility model relates to a direct-current unloading circuit of a double-fed wind power converter, in particular to a circuit which can discharge excess energy of a direct-current bus to protect a direct-current side-supported capacitor and power components. The direct-current unloading circuit comprises an insulated gate bipolar transistor (IGBT) power switch and a power resistor, and the IGBT power switch and the power resistor are connected in series, and then connected on the direct-current bus in parallel. When a master controller detects that the voltage of the direct-current bus is ultrahigh, the IGBT power switch is turned on in time, and the voltage is cut off normally, therefore, the power resistor can absorb the excess energy in time. The direct-current unloading circuit is characterized by high protecting performance and safe and reliable running.
Description
Technical field
The utility model relates to a kind of double-fed fan motor current transformer direct current discharging circuit, is specifically related to a kind of can unloading the dc bus excess energy and puts, and supports the circuit of electric capacity and power component with the protection DC side.
Background technology
Along with improving day by day of environmental protection requirement and exhausting day by day of the disposable energy, developing clean free of contamination alternative energy has become the task of top priority.Wind energy is the energy that the prospect of large-scale developing and utilizing is arranged at present most as a kind of reproducible clean non-polluting energy sources.Generally adopt the AC-DC-AC electricity generation system at present, the alternating current that generator sends frequency change at first becomes direct current by rectifier rectification, is transformed to the constant alternating current input electrical network of frequency by inverter again.Because DC side is the tie of rotor-side, grid side converter, so particularly important to its protection.
Summary of the invention
The purpose of this utility model is when solving double-fed fan motor current transformer electric network electric voltage drop or bus overvoltage, the rotor-side overcurrent, net side converter power output is restricted, energy can cause dc voltage to raise in the dc bus accumulation, supports the problem of electric capacity and power component with the induced damage resistive DC side.
For achieving the above object, the technical solution of the utility model is as follows: comprise IGBT power switch and power resistor, be connected in parallel on the dc bus after IGBT power switch and the power resistor series connection.
The utility model also possesses following characteristics: described power resistor resistance is 1 ohm.
The utility model can detect DC bus-bar voltage timely conducting IGBT power switch when too high at master controller, and voltage just often disconnects, and makes power resistor can absorb unnecessary energy in time, and has the protective value height, characteristics safe and reliable to operation.
Description of drawings
Fig. 1 the utility model circuit diagram,
Fig. 2 the utility model schematic diagram,
Wherein 1, the IGBT power switch, 2, power resistor.
Embodiment
Further specify with reference to the accompanying drawings:
It comprises IGBT power switch and power resistor a kind of double-fed fan motor current transformer direct current discharging circuit, is connected in parallel on the dc bus after IGBT power switch and the power resistor series connection, and power resistor absorbs unnecessary electric energy; Described power resistor resistance is 1 ohm.
Concrete working condition is as follows:
Because double-fed fan motor current transformer variable speed constant frequency controlling schemes realizes in rotor circuit, the power that flows through rotor circuit is the slip power that is determined by ac excited generator rotating speed range of operation, this slip power only is the sub-fraction of stator rated power, be generally 33% of peak power output, so the instantaneous energy of the dc bus of flowing through is about 500KJ.According to designing requirement double-fed fan motor current transformer direct current discharging circuit should (cycle 0.2S) absorbs the excess energy that causes because of the DC side overvoltage, and promptly 0.2S absorbs the energy of 500KJ instantaneous.Above energy all unloads and is put on the power resistor.As calculated and repetition test, determine that the power resistor resistance is 1 ohm.
When master controller by voltage sensor senses during to dc bus overvoltage (the designing requirement busbar voltage is controlled at 1100V); drive the IGBT power switch immediately; make its conducting, make power resistor can absorb unnecessary energy in time, effectively protected dc bus capacitor and power device.After master controller detects busbar voltage and falls back in the range of normal value, send signal, IGTB is turn-offed, current transformer normally moves.
Claims (2)
1. double-fed fan motor current transformer direct current discharging circuit comprises IGBT power switch and power resistor, it is characterized in that: be connected in parallel on the dc bus after IGBT power switch and the power resistor series connection.
2. double-fed fan motor current transformer direct current discharging circuit according to claim 1 is characterized in that described power resistor resistance is 1 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205047764U CN201774451U (en) | 2010-08-26 | 2010-08-26 | Direct-current unloading circuit of double-fed wind power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205047764U CN201774451U (en) | 2010-08-26 | 2010-08-26 | Direct-current unloading circuit of double-fed wind power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201774451U true CN201774451U (en) | 2011-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205047764U Expired - Fee Related CN201774451U (en) | 2010-08-26 | 2010-08-26 | Direct-current unloading circuit of double-fed wind power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201774451U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684534A (en) * | 2012-04-27 | 2012-09-19 | 西安理工大学 | High-capacity superconducting energy storage transducer provided with H-bridge current transformer |
| CN103023296A (en) * | 2012-12-27 | 2013-04-03 | 北京科诺伟业科技有限公司 | Control method for unloading circuit on direct current side of converter |
| CN103312189A (en) * | 2013-06-08 | 2013-09-18 | 北京天诚同创电气有限公司 | Three-level converter for direct-drive wind power generator set |
| CN110098631A (en) * | 2018-01-31 | 2019-08-06 | 新疆金风科技股份有限公司 | DC transmission system and its discharging circuit and unloading method |
| CN111711389A (en) * | 2020-06-16 | 2020-09-25 | 上海电气风电集团股份有限公司 | Wind driven generator and control method and device of power conversion circuit of wind driven generator |
-
2010
- 2010-08-26 CN CN2010205047764U patent/CN201774451U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684534A (en) * | 2012-04-27 | 2012-09-19 | 西安理工大学 | High-capacity superconducting energy storage transducer provided with H-bridge current transformer |
| CN103023296A (en) * | 2012-12-27 | 2013-04-03 | 北京科诺伟业科技有限公司 | Control method for unloading circuit on direct current side of converter |
| CN103312189A (en) * | 2013-06-08 | 2013-09-18 | 北京天诚同创电气有限公司 | Three-level converter for direct-drive wind power generator set |
| CN110098631A (en) * | 2018-01-31 | 2019-08-06 | 新疆金风科技股份有限公司 | DC transmission system and its discharging circuit and unloading method |
| CN111711389A (en) * | 2020-06-16 | 2020-09-25 | 上海电气风电集团股份有限公司 | Wind driven generator and control method and device of power conversion circuit of wind driven generator |
| WO2021254031A1 (en) * | 2020-06-16 | 2021-12-23 | 上海电气风电集团股份有限公司 | Wind driven generator and power conversion circuit control method and device thereof |
| CN111711389B (en) * | 2020-06-16 | 2022-03-25 | 上海电气风电集团股份有限公司 | Wind driven generator and control method and device of power conversion circuit of wind driven generator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HARBIN JIUZHOU ELECTRICAL TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: JIUZHOU ELECTRIC CO LTD, HARBIN Effective date: 20120809 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 150081 HARBIN, HEILONGJIANG PROVINCE TO: 150028 HARBIN, HEILONGJIANG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120809 Address after: 150028, No. 1, unit D43, building -29, phase three, Shimao new town, Songbei, Harbin, Heilongjiang, Binjiang Patentee after: Harbin Jiuzhou Electrical Technology Co.,Ltd. Address before: 150081 Heilongjiang Province, Harbin city Nangang District haping Road No. 162 Patentee before: Jiuzhou Electric Co., Ltd., Harbin |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110323 Termination date: 20190826 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |