公开(公告)号：US11611290B2

公开(公告)日：2023-03-21

申请号：US16957085

申请日：2018-12-06

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian Biris ,  Kent Tange ,  Duy Duc Doan ,  Torsten Lund ,  Gert Karmisholt Andersen

IPC: H02M7/5395 ,  H02M5/458 ,  H02P27/08

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：US11502616B2

公开(公告)日：2022-11-15

申请号：US17278197

申请日：2019-09-11

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian Biris ,  Kent Tange ,  Gert Karmisholt Andersen ,  Duy Duc Doan ,  Torsten Lund ,  Lars Meyer

IPC: H02M5/458 ,  H02P9/02

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.

公开(公告)号：US11454215B2

公开(公告)日：2022-09-27

申请号：US16754854

申请日：2018-10-02

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Mu Wei ,  Kouroush Nayebi ,  Torsten Lund

IPC: F03D7/04 ,  F03D9/25 ,  F03D7/02

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.

公开(公告)号：US20220220938A1

公开(公告)日：2022-07-14

申请号：US17574392

申请日：2022-01-12

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Kouroush NAYEBI ,  Torsten Lund ,  Frank Ormel ,  Mogens Bjerning

IPC: F03D7/02 ,  F03D7/04 ,  F03D9/00 ,  H02J3/38 ,  G05B19/042

Abstract: A method for controlling a renewable energy farm comprising a plurality of wind turbines and at least one central control unit is disclosed. The wind turbines of the renewable energy farm are connected to a power grid. The central control unit receives a request for change in operation of at least one of the wind turbines, where execution of the change in operation causes a change in power output of the wind turbine. The central control unit checks whether or not the change in power output is in conflict with at least one obligation of the renewable energy farm towards the power grid. In the case that the change in power output is in conflict with at least one obligation of the renewable energy farm towards the power grid, execution of the change in operation is deferred.

公开(公告)号：US11271403B2

公开(公告)日：2022-03-08

申请号：US16753965

申请日：2018-10-02

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Mu Wei ,  Torsten Lund ,  Kouroush Nayebi

IPC: H02J3/38 ,  F03D7/02 ,  H02J3/18

Abstract: A method for preparing a wind power facility for a transition from a first mode of operation to a second mode of operation includes the steps of specifying a set of operational parameters to be applied by the wind power facility in connection with the second mode of operation, said specified set of operational parameters being available for the wind power facility in response to a provided transition triggering signal, and providing the transition triggering signal and applying the specified set of operational parameters in the wind power facility in response thereto, wherein a subset of the specified set of operational parameters is applied in each of a plurality of wind turbine generators in response to the provided transition triggering signal. The first mode of operation may involve a normal mode of operation whereas the second mode of operation may involve an island mode of operation.

公开(公告)号：US11258345B2

公开(公告)日：2022-02-22

申请号：US16956462

申请日：2018-11-30

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Lars Helle ,  Torsten Lund

IPC: H02M1/32 ,  H02M1/00 ,  H02P3/22 ,  H02M5/458 ,  H02P101/15

Abstract: The present invention relates to a method for simultaneous operation of a plurality of chopper circuits of a wind turbine power converter, the method comprising the steps of operating a controllable switching member of a first chopper circuit in accordance with a first switching pattern, and operating a controllable switching member of a second chopper circuit in accordance with a second switching pattern, wherein the first switching pattern is different from the second switching pattern during a first time period. In order to reduce switching losses the first switching pattern may involve that the controllable switching member of the first chopper circuit is clamped during the first time period. Additional chopper circuits may be provided in parallel to the first and second chopper circuits. The present invention further relates to a power dissipation chopper being operated in accordance with the before mentioned method.

公开(公告)号：US10774809B2

公开(公告)日：2020-09-15

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 ,  H02J3/38 ,  H02J3/18

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.