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公开(公告)号：US20220321041A1
公开(公告)日：2022-10-06
申请号：US17628174
申请日：2020-07-08
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Esmaeil EBRAHIMZADEHVESHAREH , Torsten LUND , John Godsk NIELSEN
Abstract: The invention relates to controlling a power generating unit. Aspects of the invention include determining a virtual impedance value (Zvir), determining a virtual grid power (Pvsm) based on the virtual resistance value (Rvir) and the grid current (Igrid), determining a virtual synchronous machine rotational speed (ωVSM) and/or a synchronous machine angle (θVSM) of a virtual synchronous generator, and determining a voltage reference (Vabc) for controlling a line side converter to generate the desired reactive power (Qgrid) based on the virtual synchronous machine rotational speed or angle (ωVSM, θVSM), a virtual voltage (ΔVαβ, ΔVdq) and the voltage magnitude reference (Vqref).
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公开(公告)号：US20210351589A1
公开(公告)日：2021-11-11
申请号：US17278208
申请日：2019-09-11
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Torsten LUND , Ciprian BIRlS , Kent TANGE , Duy Due DOAN , Gert Karmisholt ANDERSEN
Abstract: This invention relates to a method of controlling at least one wind turbine of a plurality of wind turbines connected to an electrical grid at a predefined point in the electrical grid. The wind turbine comprises a DC link connecting a generator side converter to a line side converter, where the line side converter is controlled according to a modulation index requested by a power converter controller. The method comprises determining a harmonic frequency signal indicative of a harmonic frequency value at the predefined point in the electrical grid; determining a deviation between the harmonic frequency signal and a permissible harmonic frequency value; determining a permissible modulation index based on the deviation; comparing the permissible modulation index to the modulation index requested by the power converter controller; and, altering a DC link voltage set-point based on the comparison between the permissible modulation index and the requested modulation index.
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公开(公告)号：US20190219029A1
公开(公告)日：2019-07-18
申请号：US16144451
申请日：2018-09-27
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Ciprian BIRIS , Kent TANGE , Duy Duc DOAN , Torsten LUND , Gert Karmisholt ANDERSEN
Abstract: Controlling a power converters during over voltage condition. A wind turbine signal is monitored for detection of an over voltage of the grid and upon detection of the over voltage, an over-modulation mode is initiated wherein the grid side converter is operated with a modulation index being increased in an over-modulation range at least during a sub-period of the over-modulation mode, and upon the detection of the operational condition, a DC-voltage adjustment mode is initiated wherein the DC voltage of the DC link is decreased from a second voltage level towards a first voltage level at least during a sub-period of the DC-voltage adjustment mode.
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4.发明公开公开(公告)号：US20240014753A1
公开(公告)日：2024-01-11
申请号：US18040640
申请日：2021-08-03
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Torsten LUND , Hamid SOLTANI , Gert Karmisholt ANDERSEN , Germán Claudio TARNOWSKI
CPC classification number: H02P9/04 , H02P9/107 , H02P2101/15
Abstract: Aspects of the present invention relate to a method for reducing high torque levels and/or high rates of change of torque in a wind turbine generator that comprises a machine-side converter and a line-side converter connected by a DC link, and, wherein the line-side converter is operated according to a virtual synchronous machine control scheme. The method comprises: determining a generator torque; determining a torque surplus indicating the amount that the generator torque exceeds a torque limit; determining an active power surplus corresponding to the torque surplus; controlling the line-side converter according to the virtual synchronous machine control scheme using an input parameter configured to reduce the active power output of the line side converter by the active power surplus.
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公开(公告)号：US20210376749A1
公开(公告)日：2021-12-02
申请号：US17278197
申请日：2019-09-11
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Ciprian BIRIS , Kent TANGE , Gert Karmishoit ANDERSEN , Duy Duc DOAN , Torsten LUND , Lars MEYER
Abstract: This invention concerns a method of controlling a line side converter of a power converter system operating in an over-modulation range. The line side converter comprises a controller comprising a feedback control module configured to output a feedback control signal for modifying a drive signal received by a modulator. The method comprises determining a modulation index within the over-modulation range; and, controlling the feedback control module to adjust the feedback control signal based on the modulation index.
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Patent Agency Ranking
公开(公告)号：US20210359525A1
公开(公告)日：2021-11-18
申请号：US17286802
申请日：2019-08-20
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Kouroush NAYEBI , Mu WEl , Torsten LUND , Per LUND
Abstract: Embodiments provide for the control of a power plant including several generators by setting a reference frame for the generators with a first and a second axis; measuring a grid demand voltage at the shared connection point; determining active and reactive currents required at the shared connection point based on the grid demand voltage and grid codes; transforming the active and reactive currents required at the shared connection point to the reference frame where the first axis defines a first current set point and the second axis defines a second current set point; and dispatching the first and second current set points to generator controllers associated with each generator. Current set points may be generated for positive/negative frames, direct quadrature frames, real/imaginary frames and may be set evenly for all generators or adjusted per generator.
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公开(公告)号：US20240003333A1
公开(公告)日：2024-01-04
申请号：US18257965
申请日：2021-12-14
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Per Hagen NIELSEN , Torsten LUND
CPC classification number: F03D7/0284 , F03D7/048 , H02J3/50 , F05B2270/337 , H02J2300/28
Abstract: A method for controlling one or more renewable power generators forming a renewable power plant, and a controller configured to perform the method. In one aspect, plant voltage control is carried out on the basis of a more accurate voltage-reactive power relationship value which is determined dynamically based on grid conditions rather than the conventional approach of the voltage-reactive power relationship being a static value that is based on information provided by a transmission system operator during installation or commissioning of the power plant.
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公开(公告)号：US20230050448A1
公开(公告)日：2023-02-16
申请号：US17787911
申请日：2020-12-18
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Esmaeil EBRAHIMZADEHVESHAREH , Torsten LUND , Mark FABER , Poul Brandt CHRISTENSEN , Gert Karmisholt ANDERSEN
Abstract: The invention relates to a method for damping drive train oscillations of a VSM configured wind turbine. The method comprises determining a drive train damping power signal based on speed signal representing a generator speed, determining a power deviation based on a combination of a power reference for a desired power production, the drive train damping power-signal, a grid power supplied by the line side converter to the grid and a damping power, determining a virtual synchronous machine angle based on the power deviation so that the derivative of the virtual synchronous machine rotational speed is indicative of the power deviation, determining a converter reference for controlling the line side converter to generate the desired active power based on the virtual synchronous machine angle and a voltage reference for a voltage amplitude to be generated by the line side converter, and applying the converter reference to the line side converter.
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公开(公告)号：US20210199090A1
公开(公告)日：2021-07-01
申请号：US16754854
申请日：2018-10-02
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Mu WEI , Kouroush NAYEBI , Torsten LUND
Abstract: The present invention relates to a method for releasing a requested amount of power from a power facility to an associated power grid, the method comprising the steps of providing a release signal as to when the requested amount of power is to be released from the power facility to the associated power grid, ramping up the power generation of the power facility, and releasing the requested amount of power to the associated power grid in accordance with the release signal, wherein at least part of an excess power generated during ramping up is dissipated and/or stored in suitable power handling modules. The present invention also relates to a power facility controller being capable for performing this method.
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公开(公告)号：US20200350834A1
公开(公告)日：2020-11-05
申请号：US16957085
申请日：2018-12-06
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Ciprian BIRIS , Kent TANGE , Duy Duc DON , Torsten LUND , Gert Karmisholt ANDERSEN
Abstract: The invention relates to a method for operating a wind turbine which comprises a power generator, a generator side converter, a grid side converter, a DC link electrically connected to an output of the generator side converter and an input of the grid side converter. The method comprises monitoring a wind turbine signal for detection of an operational condition which requires an increase of an output voltage of the grid side converter, upon detection of the operational condition, initiate an over-modulation mode wherein the grid side converter is operated with a modulation index in an over-modulation range, and upon the detection of the operational condition, initiate a DC-voltage adjustment mode wherein the a DC-voltage of the DC link is increased from a first voltage level towards a second voltage level.
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