Direct power and stator flux vector control of a generator for wind energy conversion system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-009/00
H02P-009/48
F03D-007/02
H02P-009/30
H02P-021/12
H02P-021/22
F03D-009/25
H02P-101/15
출원번호
US-0060374
(2009-08-28)
등록번호
US-9722520
(2017-08-01)
우선권정보
EP-08163325 (2008-08-29)
국제출원번호
PCT/EP2009/061150
(2009-08-28)
§371/§102 date
20111214
(20111214)
국제공개번호
WO2010/023284
(2010-03-04)
발명자
/ 주소
Tripathi, Anshuman
Yu, Cao Shu
Jörgensen, Allan Holm
Helle, Lars
Gupta, Saurabh
출원인 / 주소
VESTAS WIND SYSTEMS A/S
대리인 / 주소
Patterson + Sheridan, LLP
인용정보
피인용 횟수 :
0인용 특허 :
16
초록▼
A method for controlling a variable speed wind turbine generator is disclosed. The generator is connected to a power converter comprising switches. The generator comprises a stator and a set of terminals connected to the stator and to the switches of the power converter. The method comprises: determ
A method for controlling a variable speed wind turbine generator is disclosed. The generator is connected to a power converter comprising switches. The generator comprises a stator and a set of terminals connected to the stator and to the switches of the power converter. The method comprises: determining a stator flux reference value corresponding to a generator power of a desired magnitude, determining an estimated stator flux value corresponding to an actual generator power, determining a difference between the determined stator flux reference value and the estimated stator flux value, and operating said switches in correspondence to the determined stator flux reference value and the estimated stator flux value to adapt at least one stator electrical quantity to obtain said desired generator power magnitude.
대표청구항▼
1. A method for controlling a variable speed wind turbine generator connected to a power converter comprising switches, said generator comprising a stator and a set of terminals connected to said stator and to said switches, said method comprising: determining an estimated stator flux value correspo
1. A method for controlling a variable speed wind turbine generator connected to a power converter comprising switches, said generator comprising a stator and a set of terminals connected to said stator and to said switches, said method comprising: determining an estimated stator flux value corresponding to an actual generator power;calculating a stator flux difference value between a stator flux reference value and the estimated stator flux value;calculating a stator flux difference vector with a magnitude and direction, wherein the stator flux difference vector is a difference between a stator flux reference value and an estimated stator flux vector value; andoperating said switches of said power converter with switching times based at least on the stator flux reference value, the estimated stator flux value, the calculated stator flux difference value, the stator flux difference vector, and a DC-link voltage of the power converter to adapt at least one stator electrical quantity to obtain a desired generator power magnitude, wherein said switches are operated according to a space vector modulation scheme for controlling a switching pattern of said switches, and wherein said switching pattern is formed by applying one or more vectors during one or more switching times, and said switching times for the switching pattern is determined from the magnitude and direction of the stator flux difference vector. 2. The method according to claim 1, wherein said switches are operated according to a pulse width modulation scheme in order to generate a synthesized voltage waveform at the stator terminals. 3. The method according to claim 1, wherein the switches comprise a first and a second set of switches and first set of the switches are operated to an on-state during a first time interval, τa, and the second set of the switches to an on-state during a second time interval, τb. 4. The method according to claim 3, wherein the first and second time intervals are determined according to τa=ΔΨs*(k)sin(π3-γ)π3sin(π3)τb=ΔΨs*(k)sin(γ)π3sin(π3). 5. An apparatus for controlling a variable speed wind turbine generator connected to a power converter comprising switches, said generator comprising a stator and a set of terminals connected to said stator and to said switches, said apparatus comprising: a power controller adapted to: determine a stator flux reference value corresponding to a generator power of a desired magnitude;calculate a stator flux difference value between the stator flux reference value and an estimated stator flux value; andcalculate a stator flux difference vector with a magnitude and direction, wherein the stator flux difference vector is a difference between a stator flux reference value and an estimated stator flux vector value; anda switch control unit adapted to operate said switches of said power converter with switching times based at least on the determined stator flux reference value, the estimated stator flux value, the calculated stator flux difference value, the stator flux difference vector, and a DC-link voltage of the power converter to adapt at least one stator electrical quantity to obtain a desired generator power magnitude, wherein said switch control unit is adapted to operate the switches according to a space vector modulation scheme for controlling a switching pattern of said switches, and wherein said switch control unit is adapted to determine the switching times for the switching pattern from the magnitude and direction of the stator flux difference vector. 6. The apparatus according to claim 5, wherein said switch control unit is adapted to operate the switches according to a pulse width modulation scheme in order to generate a synthesized voltage waveform at the stator terminals. 7. The apparatus according to claim 5, wherein the switch control unit is adapted to establish a switching pattern by providing control signals which operates a first set of the switches to an on-state during a first time interval, τa, and a second set of the switches to an on-state during a second time interval, τb. 8. The apparatus according to claim 7, wherein the switch control unit is adapted to determine the first and second time intervals according to τb=ΔΨs*(k)sin(γ)π3sin(π3)τa=ΔΨs*(k)sin(π3-γ)π3sin(π3). 9. The method of claim 3, wherein the first time interval and the second time interval are determined based on the DC-link voltage of the power converter. 10. The apparatus of claim 7, wherein the first time interval and the second time interval are determined based on the DC-link voltage of the power converter.
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이 특허에 인용된 특허 (16)
Faberman,Ira S.; Koch,Stewart C.; Lafontaine,Charles Y.; Williams,Dave E.; Scott,Harold C., Controller for AC generator.
Spiegel Ronald J. (Chapel Hill NC) Bose Bimal K. (Knoxville TN), Fuzzy logic integrated electrical control to improve variable speed wind turbine efficiency and performance.
Li, Bing; Cao, Shu Yu; Andersen, Gert Karmisholt; Tripathi, Anshuman; Sng, Eng Kian Kenneth; Gupta, Amit Kumar, Method for determining a rotor position of an electrical generator in a wind turbine.
Jørgensen, Allan Holm; Helle, Lars; Schaier, Leonard, Variable speed wind turbine with a doubly-fed induction generator and rotor and grid inverters that use scalar controls.
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