公开(公告)号：US20210351714A1

公开(公告)日：2021-11-11

申请号：US17278161

申请日：2019-09-19

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian BIRIS ,  Kent TANGE ,  Duy Duc DOAN ,  Gert Karmisholt ANDERSEN ,  Torsten LUND ,  Lars MEYER

IPC: H02M5/42 ,  H02P9/02 ,  H02M1/44 ,  F03D9/25

Abstract: This invention concerns a method of controlling a power converter system 26 operating in an overmodulation region. The power converter system 26 comprises more than two current controllers 71, 73, 77, 79 a modulator 76 and a power converter 78, and the modulator 76 is configured to provide at least one modulated drive signal 87 to the power converter 78 based on voltage reference vector signals 82a, 82b, 82c, 82d from the more than two current controllers 71, 73, 77, 79. The method comprises determining the voltage reference vector signals 82a, 82b, 82c, 82d; determining compensated voltage reference vector signals 84a, 84b, 84c, 84d indicative of a fundamental frequency of a respective voltage reference vector signal 82a, 82b, 82c, 82d; and, determining the at least one modulated drive signal 87 based on a combination of the compensated voltage reference vector signals 84a, 84b, 84c, 84d.

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

IPC: H02J3/01 ,  H02J3/38

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.

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

IPC: F03D7/02 ,  F03D9/25 ,  H02J3/38

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.

公开(公告)号：US20170264188A1

公开(公告)日：2017-09-14

申请号：US15529840

申请日：2015-11-11

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Søren ANDERSEN ,  Duy Duc DOAN ,  Gert Karmisholt ANDERSEN ,  Thomas DRLJEVIC-NIELSEN

IPC: H02M1/44 ,  H02M1/08 ,  H02M5/458 ,  H02M7/48 ,  F03D9/25 ,  H02M1/12 ,  H02M7/217

CPC classification number: H02M1/44 ,  F03D9/255 ,  H02M1/08 ,  H02M1/12 ,  H02M5/4585 ,  H02M7/217 ,  H02M7/48 ,  Y02E10/725 ,  Y02E10/76

Abstract: A power generation system, wind turbine, and method of pulse width modulation (PWM) for power converters are disclosed. The method generally includes generating a substantially random distribution of timing values, applying a filter to the random distribution to produce a modified random distribution, and delivering PWM ing signals based on the modified random distribution to the power converters.

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

IPC: F03D7/02 ,  H02P23/04

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.

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

IPC: H02M7/5395 ,  F03D7/02 ,  G01R31/50 ,  H02M5/458 ,  H02P27/08 ,  H02P9/00 ,  H02P9/10 ,  H02J3/50

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.

公开(公告)号：US20190148949A1

公开(公告)日：2019-05-16

申请号：US16099608

申请日：2017-05-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian BIRIS ,  Gert Karmisholt ANDERSEN ,  Uffe C. MERRILD ,  Leif Svinth CHRISTENSEN

IPC: H02J3/38 ,  F03D7/02 ,  F03D7/04 ,  F03D9/25 ,  H02P9/00

Abstract: Aspects of the present invention relate to a method for controlling an amount of power to be delivered from a wind turbine generator to a power grid during an abnormal power grid event, the method comprising the steps of detecting an abnormal power grid event; controlling an active current delivered to the power grid in response to a measured or determined total active current; and controlling a reactive current delivered to the power grid in response to a measured or determined total reactive current. Aspects of the present invention further relate to a computer program product for carrying out the method as well as a wind turbine generator being capable of carrying out embodiments of the invention.

公开(公告)号：US20180291876A1

公开(公告)日：2018-10-11

申请号：US15573931

申请日：2016-06-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Yi ZHOU ,  Gert Karmisholt ANDERSEN ,  Manoj GUPTA ,  Vajira Suminda GANEPOLA ,  Ciprian BIRIS ,  Miguel Angel COVA ACOSTA

IPC: F03D7/02 ,  F03D9/25 ,  G05B13/02 ,  G01R19/25 ,  H02K7/18 ,  H02P9/00

Abstract: A method is provided of protecting a wind turbine with a doubly-fed induction generator (DFIG) against a sub-synchronous resonance (SSR) event acting on the wind turbine. A plurality of power-output values or current-output values is measured over a given period of time that corresponds to a measurement cycle. It is determined whether power-output values or current-output-values measured in the at-least-one measurement cycle are indicative of an SSR-event critical for further operation of the wind turbine. The wind turbine is shut down if the measured power-output values or current-output values are indeed indicative of an SSR-event critical for operation of the wind turbine.

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

IPC: H02P9/04 ,  H02P9/10

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.

公开(公告)号：US20180335017A1

公开(公告)日：2018-11-22

申请号：US15777795

申请日：2016-12-01

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： John Godsk NIELSEN ,  Duy Duc DOAN ,  Søren ANDERSEN ,  Gert Karmisholt ANDERSEN

IPC: F03D7/04 ,  F03D7/02 ,  H02J3/38 ,  H02M5/458

CPC classification number: F03D7/042 ,  F03D7/026 ,  F03D7/0264 ,  F05B2270/3201 ,  H02J3/386 ,  H02M5/4585 ,  Y02E10/723 ,  Y02E10/763

Abstract: A method for controlling a wind turbine system including an electrical generator, a power converter system, a DC-link, and at least a grid-side breaker arrangement controllable between open and closed states, wherein the method comprises monitoring for the presence of a shutdown event and, in response to identifying the presence of a shutdown event, controlling the wind turbine into a production-ready state, comprising: i) controlling the grid-side breaker arrangement in the closed state; ii) disabling one or more drive signals to the power converter system; and iii) controlling the DC-link of the power converter system in a charged state. Advantageously, this approach reduces the frequency of use of the grid-side breaker arrangement which extends serviceable life considerably, and also allows the wind turbine system to be transitioned rapidly between an operating state and a production-ready state.