Method of controlling a variable speed wind turbine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-009/00
H02P-009/04
출원번호
US-0003773
(2009-07-07)
등록번호
US-8624422
(2014-01-07)
우선권정보
DK-2008 01032 (2008-07-22)
국제출원번호
PCT/IB2009/052951
(2009-07-07)
§371/§102 date
20110218
(20110218)
국제공개번호
WO2010/010477
(2010-01-28)
발명자
/ 주소
Miranda, Erik Carl Lehnskov
출원인 / 주소
Vestas Wind Systems A/S
대리인 / 주소
Patterson & Sheridan, LLP
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
in a method of controlling a variable speed wind turbine, said wind turbine comprising a double-fed asynchronous generator having rotor windings and stator windings and means for controlling the wind turbine speed, the method comprises the following steps:—measuring or calculating, based on measured
in a method of controlling a variable speed wind turbine, said wind turbine comprising a double-fed asynchronous generator having rotor windings and stator windings and means for controlling the wind turbine speed, the method comprises the following steps:—measuring or calculating, based on measured parameters, the active electrical power (Pr) in the rotor windings, comparing the active electrical power (Pr) in the rotor windings with a preset limit (PrLimit), when the active electrical power (Pr) in the rotor windings exceeds the preset limit (PrLimit), controlling the wind turbine speed to minimize the difference between the active electrical power (Pr) in the rotor windings and a preset reference (PrRef). The rotor power (Pr) is kept at a reduced level, thus avoiding overload of wind turbine generator components.
대표청구항▼
1. A method of controlling a variable speed wind turbine comprising a double-fed asynchronous generator having rotor windings and stator windings, said method comprising: measuring or calculating, based on measured parameters, the active electrical power in the rotor windings,comparing the active el
1. A method of controlling a variable speed wind turbine comprising a double-fed asynchronous generator having rotor windings and stator windings, said method comprising: measuring or calculating, based on measured parameters, the active electrical power in the rotor windings,comparing the active electrical power in the rotor windings with a preset limit, andwhen the active electrical power in the rotor windings exceeds the preset limit, controlling the generator speed to minimize the difference between the active electrical power in the rotor windings and a preset reference thereby maintaining the active electrical power approximately equal to or below the preset reference, wherein the preset reference is a recommended power value for the rotor windings and the preset limit is a predefined value less than the preset reference. 2. The method of claim 1, wherein the control of the generator speed to minimize the difference between the active electrical power in the rotor windings and the preset limit is performed by a PID controller, the PID controller using the electrical power in the rotor windings and the preset limit as input parameters and an output of the PID controller is a correction value for setting the generator speed. 3. The method of claim 2, wherein the active electrical power in the rotor windings is calculated based on measurements of the active turbine power P and the slip s, using the equation Pr=P·s/1+s. 4. The method of claim 1, wherein the active electrical power in the rotor windings is calculated based on measurements of voltages and currents of the rotor windings. 5. The method of claim 1, wherein the active electrical power in the rotor windings is calculated based on measurements of the active turbine power P and the slip s, using the equation Pr=P·s/1+s. 6. The method of claim 1, wherein the generator speed is controlled to optimize the generated power. 7. The method of claim 1, wherein controlling the generator speed comprises: calculating, using a PID controller, a correction value based on the difference between the active electrical power and the preset reference; andcombining the correction value with a generator speed value outputted by a wind turbine controller to yield a corrected generator speed value used to set the speed of the generator. 8. The method of claim 7, further comprising: when the active electrical power in the rotor windings is less than the preset limit, controlling the speed of the generator using the output of the wind turbine controller but not the correction value of the PID controller. 9. The method of claim 7, wherein the control of the generator speed to minimize the difference between the active electrical power in the rotor windings and the preset limit is performed by the PID controller, the PID controller using the electrical power in the rotor windings and the preset limit as input parameters and an output of the PID controller is a correction value for setting the generator speed. 10. The method of claim 9, wherein the active electrical power in the rotor windings is calculated based on measurements of voltages and currents of the rotor windings. 11. The method of claim 7, wherein the active electrical power in the rotor windings is calculated based on measurements of voltages and currents of the rotor windings. 12. The method of claim 7, wherein the active electrical power in the rotor windings is calculated based on measurements of the active turbine power P and the slip s, using the equation Pr=P·s/1+s.
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이 특허에 인용된 특허 (4)
Barton, Werner; Buecker, Andreas, Method for operating a frequency converter of a generator and wind energy turbine having a generator operated according to the method.
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