Method and system for controlling a DC link voltage of a power converter connecting an electric generator of a wind turbine with a power grid
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-009/04
H02M-005/45
출원번호
US-0367491
(2012-02-07)
등록번호
US-9543852
(2017-01-10)
우선권정보
EP-11154346 (2011-02-14)
발명자
/ 주소
Deng, Heng
Groendahl, Erik
출원인 / 주소
SIEMENS AKTIENGESELLSCHAFT
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
A method is provided for controlling a DC link voltage of a power converter connecting an electric generator of a wind turbine with a power grid. The method includes determining the rotational speed of a rotor of the electric generator. The method further includes determining a strength of harmonic
A method is provided for controlling a DC link voltage of a power converter connecting an electric generator of a wind turbine with a power grid. The method includes determining the rotational speed of a rotor of the electric generator. The method further includes determining a strength of harmonic components of the rotational speed of the rotor, wherein the harmonic components have frequency components being different from a fundamental rotational frequency of the electric generator. The method also includes determining a damping reference signal as a function of the determined strength of the harmonic components, and controlling the DC link voltage of the power converter in response to the determined damping reference signal. A corresponding control system is also provided.
대표청구항▼
1. A method for controlling a DC link voltage of a power converter connecting an electric generator of a wind turbine with a power grid, the method comprising: determining a rotational speed of a rotor of the electric generator,determining a strength of harmonic components of the rotational speed of
1. A method for controlling a DC link voltage of a power converter connecting an electric generator of a wind turbine with a power grid, the method comprising: determining a rotational speed of a rotor of the electric generator,determining a strength of harmonic components of the rotational speed of the rotor, wherein the harmonic components have frequency components being different from a fundamental rotational frequency of the electric generator,determining a damping reference signal as a function of the determined strength of the harmonic components,measuring a DC link voltage in a DC link capacitor of a DC link of the power converter that connects the electric generator of the wind turbine with the power grid to obtain a measurement signal indicative of the actual DC link voltage;filtering the measurement signal indicative of the actual DC link voltage with a further filter effective to suppress at least partially frequency components corresponding to mechanic resonance frequencies of a drive train of the wind turbine, andcontrolling a time-dependent variation in the DC link voltage of the DC link capacitor of the power converter that connects the electric generator of the wind turbine with the power grid in response to the determined damping reference signal and further in response to the filtered measurement signal, the controlling of the variation in the DC link voltage of the DC link capacitor effective to damp the harmonic components of the rotor without feeding harmonic power to the grid. 2. The method according to claim 1, wherein determining the strength of harmonic components of the rotational speed of the rotor comprises: receiving a signal being indicative for the actual rotational speed of the rotor, andfiltering the signal with a filter, which is capable of suppressing at least partially frequency components corresponding to the fundamental rotational frequency. 3. The method according to claim 2, wherein determining the damping reference signal comprises: receiving the filtered signal from the filter, andlimiting the strength of the received filtered signal. 4. The method according to claim 1, wherein controlling the DC link voltage of the power converter is carried out in further response to the actual DC link voltage. 5. The method according to claim 4, wherein controlling the DC link voltage of the power converter is carried out in further response to a reference signal for the DC link voltage. 6. The method according to claim 1, wherein controlling the DC link voltage comprises controlling an AC-to-DC conversion being carried out in a generator bridge of the power converter. 7. The method according to claim 6, wherein a reference signal for the amount of power to be generated by the wind turbine is used for controlling a DC-to-AC conversion being carried out in a network bridge. 8. The method according to claim 1, wherein controlling the DC link voltage comprises controlling a DC-to-AC conversion being carried out in a network bridge of the power converter. 9. The method according to claim 8, wherein a reference signal for the amount of power to be generated by the wind turbine is used for controlling an AC-to-DC conversion being carried out in a generator bridge. 10. A computer program for controlling a DC link voltage of a power converter connecting an electric generator of a wind turbine with a power grid, the computer program, when being executed by a data processor, is adapted for carrying out the method according to claim 1. 11. A control system for controlling a DC link voltage of a power converter connecting an electric generator of a wind turbine with a power grid, the control system comprising: a first determining unit for determining the rotational speed of a rotor of the electric generator,a second determining unit for determining a strength of harmonic components of the rotational speed of the rotor, wherein the harmonic components have frequency components being different from a fundamental rotational frequency of the electric generator,a third determining unit for determining a damping reference signal as a function of the determined strength of the harmonic components,a measurement unit to measure a DC link voltage in a DC link capacitor of a DC link of the power converter that connects the electric generator of the wind turbine with the power grid to obtain a measurement signal indicative of the actual DC link voltage,a filter for filtering the measurement signal indicative of the actual DC link voltage, the filter effective to suppress at least partially frequency components corresponding to mechanic resonance frequencies of a drive train of the wind turbine, anda control unit for controlling a time-dependent variation in the DC link voltage of the DC link capacitor in the DC link of the power converter that connects the electric generator of the wind turbine with the power grid in response to the determined damping reference signal and further in response to the filtered measurement signal, the control of the variation in the DC link voltage of the DC link capacitor effective to damp the harmonic components of the rotor without feeding harmonic power to the grid. 12. The control system as set forth in claim 11, wherein the control system is realized by a power converter controller for controlling the operation of the power converter, the power converter controller comprising: a first portion for controlling the operation of a generator bridge carrying out a AC-to-DC conversion within the power converter, and a second portion for controlling the operation of a network bridge carrying out a DC-to-AC conversion within the power converter.
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이 특허에 인용된 특허 (2)
Miyakawa Kado (Hitachi JPX), Apparatus for removing harmonic components of an electric power frequency generated in electric power generation equipme.
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