公开(公告)号：WO2022028660A1

公开(公告)日：2022-02-10

申请号：PCT/DK2021/050253

申请日：2021-08-03

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： LUND, Torsten ,  SOLTANI, Hamid ,  ANDERSEN, Gert Karmisholt ,  TARNOWSKI, Germán Claudio

IPC: H02P9/00

Abstract: Aspects of the present invention relate to a method (100) for reducing high torque levels and/or high rates of change of torque in a wind turbine generator (10) that comprises a machine-side converter (28) and a line-side converter (30) connected by a DC link (32), and, wherein the line-side converter (30) is operated according to a virtual synchronous machine control scheme. The method (100) comprises: determining (102) a generator torque (Tref); determining (104) a torque surplus (Tsurplus) indicating the amount that the generator torque (Tref) exceeds a torque limit; determining (106) an active power surplus (Psurplus) corresponding to the torque surplus (Tsurplus); controlling (108) the line-side converter (30) according to the virtual synchronous machine control scheme using an input parameter configured to reduce the active power output of the line side converter (30) by the active power surplus (Psurplus).

公开(公告)号：WO2020135905A1

公开(公告)日：2020-07-02

申请号：PCT/DK2019/050391

申请日：2019-12-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： NIELSEN, John Godsk ,  LUND, Torsten ,  EBRAHIMZADEHVESHAREH, Esmaeil

IPC: H02P9/00

Abstract: The invention relates to a method for controlling a wind turbine as virtual synchronous machine by determining the synchronous machine rotational speed rotational speed ωVSM and the synchronous machine angle θVSM. The virtual synchronous machine rotational speed ωVSM is determined based on a combination of a feedback of a damping power Pd, a power reference Pref for a desired power output of the wind turbine, a grid power Pgrid supplied by the wind turbine to a power grid and a chopper power Pchop dissipated by the chopper and an inertial integration model, the synchronous machine angle θVSM is determined based on an integration of the synchronous machine rotational speed ωVSM, and the damping power Pd is determined based on the virtual synchronous machine rotational speed ωVSM.

公开(公告)号：WO2020057704A1

公开(公告)日：2020-03-26

申请号：PCT/DK2019/050267

申请日：2019-09-11

Applicant: VESTAS WIND SYSTEMS A/S

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

IPC: H02J3/38 ,  H02J3/01

Abstract: This invention relates to a method of controlling at least one wind turbine (10) of a plurality of wind turbines connected to an electrical grid (28) at a predefined point in the electrical grid (28). The wind turbine comprises a DC link (48) connecting a generator side converter (44) to a line side converter (46), where the line side converter (46) is controlled according to a modulation index requested by a power converter controller (56). The method comprises determining a harmonic frequency signal 66 indicative of a harmonic frequency value at the predefined point in the electrical grid (28); determining a deviation (70) between the harmonic frequency signal (66) and a permissible harmonic frequency value; determining a permissible modulation index (78) based on the deviation (70); comparing the permissible modulation index (78) to the modulation index requested by the power converter controller (56); and, altering a DC link (48) voltage set-point based on the comparison between the permissible modulation index (78) and the requested modulation index.

公开(公告)号：WO2019068297A1

公开(公告)日：2019-04-11

申请号：PCT/DK2018/050244

申请日：2018-10-02

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： WEI, Mu ,  LUND, Torsten ,  NAYEBI, Kouroush

IPC: H02J3/38 ,  H02J3/18 ,  H02J7/00

Abstract: The present invention relates to a method for preparing a wind power facility for a transition from a first mode of operation to a second mode of operation, the wind power facility comprising a wind power plant comprising a plurality of wind turbine generators, the method comprising 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 the 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. The present invention further relates to a wind power facility comprising a wind power facility controller adapted to carry out the above method.

公开(公告)号：WO2022167048A1

公开(公告)日：2022-08-11

申请号：PCT/DK2022/050011

申请日：2022-01-20

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： YIN, Bo ,  LUND, Torsten ,  ANDERSEN, Gert Karmisholt ,  NAYEBI, Kouroush ,  GUPTA, Manoj

IPC: H02J3/18

Abstract: The invention relates to wind turbines, particularly to controlling reactive power exchange between a power grid and a wind power plant. The wind power plant has a plurality of wind turbine generators each having a corresponding power converter with a converter controller. Further, the wind power plant has a power plant transformer with an on load tap changer coupled between the wind power plant and the power grid. The power plant controller is regulating the on load tap changer and is generating reactive component setpoints for the wind turbine generators, when determining a need for production of short-term reactive power due to a sudden change in reactive power measured at the point of common coupling.

公开(公告)号：WO2022128032A1

公开(公告)日：2022-06-23

申请号：PCT/DK2021/050364

申请日：2021-12-14

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： NIELSEN, Per Hagen ,  LUND, Torsten

IPC: H02J3/38 ,  H02J3/50 ,  F03D7/02 ,  F03D7/04

Abstract: A method for controlling one or more renewable power generators forming a renewable power plant, and a controller configured to perform the method. The method comprises: receiving a measured voltage level of a power network to which the one or more renewable power generators are connected; determining reactive power set points for the one or more renewable power generators based on the measured voltage level; and dispatching the reactive power set points to controllers of the one or more renewable power generators for controlling the one or more renewable power generators. The step of determining reactive power set points for the one or more renewable power generators based on the measured voltage level comprises dynamically determining a voltage-reactive power relationship value (dV/dQ), based on one or more power network conditions, that is indicative of changes in voltage in response to a change in reactive power; determining a voltage error value between a voltage reference value (Vpcc_ref) and the measured voltage level (Vpcc); and determining the reactive power set points based on voltage error value and the dynamically determined voltage-reactive power relationship value (dV/dQ). An advantage of the invention is that plant voltage control is carried out on the basis of a more accurate voltage-reactive power relationship value (dV/dQ) 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. The power plant operator is therefore able to satisfy the requirements for reactive power support with improved accuracy and reliability.

公开(公告)号：WO2021219177A1

公开(公告)日：2021-11-04

申请号：PCT/DK2021/050121

申请日：2021-04-22

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： LUND, Torsten ,  NIELSEN, John Godsk ,  ANDERSEN, Gert Karmisholt ,  NAYEBI, Kouroush ,  CHRISTENSEN, Poul Brandt ,  TARNOWSKI, Germán Claudio ,  EBRAHIMZADEHVESHAREH, Esmaeil

IPC: H02J3/32 ,  H02J3/38 ,  H02J2300/28 ,  H02J3/381

Abstract: The invention relates to a method for controlling power generation of a VSM wind turbine. The wind turbine comprises a machine side converter (203), a line side converter (204), a DC link (205), and an electric storage device (241) electrically connected to the DC link. The method comprises determining a first power control signal (PMSC) to the machine side converter (203), determining a second power control signal (PVSM) for controlling a desired output power (Pgrid) of the line side converter (204) based on a storage device voltage error (Vbat_e), and a power production reference (Ppro), and determining a charging current reference (Ibat_ref) for controlling charging and discharging of the electric storage device (241) based on a DC-link voltage error (Vdc_e).

公开(公告)号：WO2019120402A1

公开(公告)日：2019-06-27

申请号：PCT/DK2018/050316

申请日：2018-11-30

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： HELLE, Lars ,  LUND, Torsten

IPC: H02M5/44 ,  H02J3/38 ,  H02M1/32

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：WO2021223829A1

公开(公告)日：2021-11-11

申请号：PCT/DK2021/050144

申请日：2021-05-06

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： LUND, Torsten ,  TARNOWSKI, Germán Claudio ,  NIELSEN, John Godsk ,  NIELSEN, Per Hagen

IPC: H02J3/50 ,  H02J3/24

Abstract: Aspects of the present invention relate to a method of voltage control for at least one wind turbine generator (14) configured to absorb and supply reactive power on demand, the method comprises: receiving a dispatch signal from a power plant controller (22) indicating a reactive power set point (Qunit n setp); determining a terminal voltage level (Vunit) of the at least one wind turbine generator (14); generating a reactive power correction value (Qcorrect) based on a deviation of the terminal voltage level (Vunit) from a voltage set point (Vunit n-setp); adjusting the reactive power set point (Qunit n setp) by the reactive power correction value (Qcorrect); and controlling the at least one wind turbine generator according to the adjusted reactive power set point (Qunit n control).

公开(公告)号：WO2021008664A1

公开(公告)日：2021-01-21

申请号：PCT/DK2020/050209

申请日：2020-07-08

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： EBRAHIMZADEHVESHAREH, Esmaeil ,  LUND, Torsten ,  NIELSEN, John Godsk

IPC: H02J3/38 ,  H02J3/50 ,  H02J3/48 ,  H02J3/16

Abstract: The invention relates to a method for controlling a power generating unit. The method includes 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).