Method for operating a frequency converter of a generator
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02M-005/458
H02M-005/45
출원번호
UP-0571735
(2003-09-16)
등록번호
US-7787266
(2010-09-20)
국제출원번호
PCT/EP2003/010269
(2003-09-16)
§371/§102 date
20061207
(20061207)
국제공개번호
WO05/027301
(2005-03-24)
발명자
/ 주소
Janssen, Wilhelm
Menke, Detlef
출원인 / 주소
General Electric Company
대리인 / 주소
Global Patent Operation
인용정보
피인용 횟수 :
5인용 특허 :
7
초록▼
The method relates to the operation of a frequency converter of a generator in particular of a wind energy turbine, in the event of a substantial grid voltage drop, wherein the frequency converter (10) comprises an AC/DC converter (20), to be connected to the generator (14), a DC/AC converter (22) t
The method relates to the operation of a frequency converter of a generator in particular of a wind energy turbine, in the event of a substantial grid voltage drop, wherein the frequency converter (10) comprises an AC/DC converter (20), to be connected to the generator (14), a DC/AC converter (22) to be connected to the voltage grid (18), and a DC link circuit (24) for connecting the AC/DC converter (20) to the DC/AC converter (22). The method comprises the step of reducing an output voltage of the DC link circuit (24) for increasing an output current of the DC/AC converter (22) and/or reducing the operation frequency of electronic switches (28) of the DC/AC converter (22) for increasing the output current of the DC/AC converter (22).
대표청구항▼
The invention claimed is: 1. A method for operating a frequency converter for a generator of a wind turbine supplying electrical power to a public power grid, wherein the frequency converter comprises an AC/DC converter connected to the generator, a DC/AC converter connected to the grid, and a DC l
The invention claimed is: 1. A method for operating a frequency converter for a generator of a wind turbine supplying electrical power to a public power grid, wherein the frequency converter comprises an AC/DC converter connected to the generator, a DC/AC converter connected to the grid, and a DC link circuit for connecting the AC/DC converter to the DC/AC converter, the method comprising the steps of: sensing a grid voltage of the grid to detect a grid condition wherein the grid voltage decreases by at least a predetermined threshold and remains below the predetermined threshold for at least a predetermined time; and reducing, upon detection of the grid condition, at least one of: an output voltage of the DC link circuit for increasing an output current of the DC/AC converter, and an operation frequency of electronic switches of the DC/AC converter for increasing the output current of the DC/AC converter. 2. The method of claim 1, wherein the predetermined threshold is about 10% of a nominal voltage of the grid, and wherein the reducing step is terminated when, for a few seconds, the grid voltage is increased to at least about 80% of the nominal voltage. 3. The method of claim 1, wherein the predetermined threshold is about 20% of a nominal voltage of the public power grid, and wherein the reducing step is terminated when, for a few seconds, the grid voltage is increased to at least about 90% of the nominal voltage. 4. The method of claim 1, wherein the reducing step comprises reducing the output voltage of the DC link circuit by controlling a time interval between a zero-crossing of the output voltage of a phase of the generator and an operation of an electronic switch of the AC/DC converter. 5. The method of claim 1, wherein the reducing step comprises reducing the output voltage of the DC link circuit by reducing a pulse width interval of an electronic switch of the AC/DC converter. 6. The method of claim 1, wherein the reducing step is performed such that the output current of the DC/AC converter is increased without a substantial change of energy losses in the electronic switches of the DC/AC converter. 7. The method of claim 1, further in the reducing step, reducing simultaneously both the output voltage of the DC link circuit and the operation frequency of electronic switches of the DC/AC converter for increasing the output current of the DC/AC converter. 8. A method for operating a frequency converter for a generator of a wind turbine supplying electrical power to a public power grid, in the event of a substantial grid voltage drop in the grid, wherein the frequency converter comprises an AC/DC converter connected to the generator, a DC/AC converter connected to the grid, and a DC link circuit for connecting the AC/DC converter to the DC/AC converter, the method comprising the step of: reducing an operation frequency of electronic switches of the DC/AC converter for increasing the output current of the DC/AC converter. 9. The method of claim 8, wherein the reducing step is performed when, for a few seconds, the grid voltage is decreased by at least about 10% of a nominal voltage of the grid, and wherein the reducing step is terminated when, for a few seconds, the grid voltage is increased to at least about 80% of the nominal voltage. 10. The method of claim 8, wherein the reducing step is performed when, for a few seconds, the grid voltage is decreased by at least about 20% of a nominal voltage of the grid, and wherein the reducing step is terminated when, for a few seconds, the grid voltage is increased to at least about 90% of the nominal voltage. 11. The method of claim 8, wherein the reducing step is performed such that the output current of the DC/AC converter is increased without a substantial change of energy losses in the electronic switches of the DC/AC converter.
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이 특허에 인용된 특허 (7)
Scott Harold C. ; Shelden Rod K., Energy conversion system employing stabilized half-bridge inverter.
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Lof, Per-Anders Kristian; Gertmar, Lars Gustaf Ingolf; Andren, Lars Anders Tommy, System, method and computer program product for enhancing commercial value of electrical power produced from a renewable energy power production facility.
Yuan, Xiaoming; Weng, Haiqing; Tan, Zhuohui; Liu, Yunfeng; Yang, Wenqiang; Zhu, Pengcheng, System and method for converter switching frequency control.
Yasugi, Akira, Wind turbine generator for use in cold weather, method of controlling the same, and wind turbine generating system for use in cold weather.
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