IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0204854
(2001-03-08)
|
우선권정보 |
DK-0000377 (2000-03-08) |
국제출원번호 |
PCT/DK01/00153
(2002-11-04)
|
§371/§102 date |
20021104
(20021104)
|
국제공개번호 |
WO01/66940
(2001-09-13)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
18 인용 특허 :
8 |
초록
▼
A method of controlling the speed of rotation of a turbine, the turbine comprising a rotor, the method comprising the steps of measuring or estimating power or torque related to the energy production of the turbine, processing the measured or estimated power or torque so as to obtain a corresponding
A method of controlling the speed of rotation of a turbine, the turbine comprising a rotor, the method comprising the steps of measuring or estimating power or torque related to the energy production of the turbine, processing the measured or estimated power or torque so as to obtain a corresponding rotational speed, comparing the obtained rotational speed to a first predefined threshold value and to a second predefined threshold value, the second predefined threshold value being larger than the first predefined threshold value, and controlling the speed of rotation of the rotor according to the obtained rotational speed, so as to obtain a predetermined energy production from the turbine, and in such a way that in case the obtained rotational speed does not exceed the first predefined threshold value, the predetermined energy production from the turbine is optimal, in case the obtained rotational speed exceeds the first predefined threshold value, but does not exceed the second predefined threshold value, the predetermined energy production from the turbine is optimal, in case the obtained rotational speed exceeds the second predefined threshold value, the speed of rotation of the rotor of the turbine is reduced in a predefined manner to a value corresponding to the first predefined threshold value.
대표청구항
▼
1. A method of controlling the speed of rotation of a turbine, the turbine comprising a rotor, the method comprising the steps ofmeasuring or estimating power or torque related to the energy production of the turbine, processing the measured or estimated power or torque so as to obtain a correspondi
1. A method of controlling the speed of rotation of a turbine, the turbine comprising a rotor, the method comprising the steps ofmeasuring or estimating power or torque related to the energy production of the turbine, processing the measured or estimated power or torque so as to obtain a corresponding rotational speed, comparing the obtained rotational speed to a first predefined threshold value and to a second predefined threshold value, the second predefined threshold value being larger than the first predefined threshold value, and controlling the speed of rotation of the rotor according to the obtained rotational speed, so as to obtain a predetermined energy production from the turbine, and in such a way that in case the obtained rotational speed does not exceed the first predefined threshold value, the predetermined energy production from the turbine is optimal, in case the obtained rotational speed exceeds the first predefined threshold value, but does not exceed the second predefined threshold value, the predetermined energy production from the turbine is optimal, in case the obtained rotational speed exceeds the second predefined threshold value, the speed of rotation of the rotor of the turbine is reduced in a predefined manner to a value corresponding to the first predefined threshold value. 2. A method according to claim 1 wherein the turbine is a wind turbine.3. A method according to claim 1, wherein the processing step is performed electronically.4. A method according to claim 1, wherein, in case the predetermined energy production from the turbine is optimal, the turbine is operated in such a way that the instantaneous Cp for the turbine is as close as possible or equal to the maximum Cp.5. A method according to claim 1, wherein the processing is based on a predetermined set of data being values of pre-selected Cp's and corresponding rotational speeds.6. A method according to claim 5, the turbine being a wind turbine, wherein the pre-selected Cp's are the maximum Cp's obtained during stationary rational conditions of the wind turbine at varying wind speeds.7. A method according to claim 1, further comprising the step of initially determining curves of mechanical power and/or Cp for the turbine rotor at different rotational speeds.8. A method according to claim 7, the turbine being a wind turbine, wherein the step of processing the measured or estimated power or torque includes the steps offor each rotational speed determining the wind speed which gives Cp,max, and determining the mechanical and/or electrical power corresponding to said wind speed. 9. A method according to claim 7, the turbine being a wind turbine, wherein the step of processing the measured or estimated power or torque includes the steps ofsubsequently determining curves of mechanical power and/or Cp for the turbine rotor at different rotational speeds, for each rotational speed determining the wind speed which gives Cp,max, and determining the mechanical and/or electrical power corresponding to said wind speed. 10. A method according to claim 7, wherein the wind speeds giving Cp,max for each rotational speed are predetermined from pre-recorded or theoretical data.11. A method according to claim 1, wherein the first predefined threshold value corresponds to a nominal or a pseudo-nominal rotational speed of the rotor of the turbine, and wherein the second predefined threshold value corresponds to an upper limit of the rotor of the turbine.12. A method according to claim 1, wherein the speed of rotation of the rotor of the turbine, in case the obtained rotational speed exceeds the second predefined threshold value, is reduced by:maintaining the speed of rotation on a value corresponding to the second predefined threshold value, while the energy production of the turbine increases until it reaches an energy threshold value, and subsequently reducing the speed of rotation to a value corresponding to the first predefined threshold value in case the energy production continues to increase. 13. A method according to claim 1, wherein the speed of rotation of the rotor of the turbine, in case the obtained rotational speed exceeds the second predefined threshold value, is reduced by:reducing the speed of rotation linearly with respect to the energy production of the turbine until a predefined energy production as well as the speed of rotation corresponding to the first predefined threshold value is obtained. 14. A method according to claim 1, further comprising the step of measuring the speed of rotation of the rotor.15. A method according to claim 14, further comprising the steps ofcomparing the measured speed of rotation of the rotor and the rotational speed obtained by processing the measured or estimated power or torque, producing a signal being significant for said comparison, and controlling the speed of rotation of the rotor according to said signal. 16. A method according to claim 14, wherein the produced signal indicates the difference between the measured speed of rotation and the rotational speed obtained by processing the measured or estimated power or torque.17. A method according to claim 1, the turbine being a wind turbine, the method further comprising the step of adjusting the power generated by the turbine by adjusting the pitch angle of the turbine.18. A turbine comprisinga rotor, a generator, means for measuring or estimating power or torque related to the energy production of the turbine, processing means for processing the power or torque measured or estimated by the measuring or estimating means, so as to obtain a corresponding rotational speed, comparing means for comparing the obtained rotational speed to a first predefined threshold value and to a second predefined threshold value, the second predefined threshold value being larger than the first predefined threshold value, and control means for controlling the speed of rotation of the rotor according to the obtained rotational speed, the control means being adapted to control the speed of rotation in such a way that a predetermined energy production is obtained from the turbine, and in such a way that in case the obtained rotational speed does not exceed the first predefined threshold value, the predetermined energy production from the turbine is optimal, in case the obtained rotational speed exceeds the first predefined threshold value, but does not exceed the second predefined threshold value, the predetermined energy production from the turbine is optimal, in case the obtained rotational speed exceeds the second predefined threshold value, the speed of rotation of the rotor of the turbine is reduced in a predefined manner to a value corresponding to the first predefined threshold value. 19. A turbine according to claim 18, wherein the turbine is a wind turbine.20. A turbine according to claim 18, wherein the processing means is electronically processing means.21. A turbine according to claim 19, further comprising means for determining curves of mechanical power and/or Cp for the turbine.22. A turbine according to claim 20, further comprisingmeans for determining, for each rotational speed, the wind speed which gives Cp,max, and means for determining the mechanical and/or electrical power corresponding to said wind speed. 23. A turbine according to claim 21, wherein the means for determining wind speed comprises tables containing pre-recorded or theoretical data.24. A turbine according to claim 21, wherein the means for determining wind speed comprises curves of pre-recorded or theoretical data.25. A turbine according to claim 18, further comprising means for measuring the speed of rotation of the rotor.26. A turbine according to claim 25, further comprising means for comparing the measured speed of rotation and the rotational speed obtained by processing the measured or estimated power or momentum.27. A turbine according to claim 26, wherein the control means comprises means for receiving a signal, said signal being produced by the means for comparing the measured speed of rotation and the obtained rotational speed, and wherein the control means controls the speed of rotation of the rotor according to said signal.28. A turbine according to claim 19, wherein the turbine is a gear-less wind turbine.29. A turbine according to claim 18, further comprising means for, in case the obtained rotational speed exceeds the second predefined threshold value, reducing the speed of rotation of the rotor of the turbine, the reducing means being adapted tomaintain the speed of rotation on a value corresponding to the second predefined threshold value, while the energy production of the turbine increases until it reaches an energy threshold value, and subsequently reduce the speed of rotation to a value corresponding to the first predefined threshold value in case the energy production continues to increase. 30. A turbine according to claim 18, further comprising means for, in case the obtained rotational speed exceeds the second predefined threshold value, reducing the speed of rotation of the rotor of the turbine, the reducing means being adapted toreduce the speed of rotation linearly with respect to the energy production of the turbine until a predefined energy production as well as the speed of rotation corresponding to the first predefined threshold value is obtained.
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