公开(公告)号：US11715955B2

公开(公告)日：2023-08-01

申请号：US17419251

申请日：2019-12-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： John Godsk Nielsen ,  Torsten Lund ,  Esmaeil Ebrahimzadehveshareh

IPC: F03D7/00 ,  H02J3/24 ,  F03D7/02 ,  H02J3/38

CPC classification number: H02J3/24 ,  F03D7/0284 ,  H02J3/381 ,  H02J2300/28

Abstract: The invention relates to a method for controlling a power generating unit such as a wind turbine which is configured as a virtual synchronous machine. Capacitor voltage signals obtained from voltage measurements of output capacitors are filtered in order to reduce a magnitude of an impedance peak and/or shift the impedance peak where the impedance peak is present in an impedance characteristic of the output of the power generating unit. Filter compensated voltage signals obtained from the output capacitors are combined with a voltage magnitude reference to obtain filtered capacitor voltage signals used for controlling the line side converter and thereby affect the impedance peak in a desired way.

公开(公告)号：US11411519B2

公开(公告)日：2022-08-09

申请号：US16590475

申请日：2019-10-02

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Poul Møhl Dyrlund ,  Gert Karmisholt Andersen ,  Torsten Lund ,  Hamid Soltani

IPC: G05B19/048 ,  H02P9/00 ,  G05B15/02 ,  H02P101/15

Abstract: The present invention relates to a method of controlling a doubly fed induction generator wind turbine converter system in case of a sub-synchronous resonance event, the method comprising the steps of detecting the sub-synchronous resonance event, and switching from a first control mode to a second control mode in response to detecting the predetermined event, wherein the second control mode comprises the step of setting at least one rotor current controller parameter on the basis of a generator speed of the doubly fed induction generator. The predetermined event may also be a fault ride through event. The present invention further relates to a doubly fed induction generator wind turbine converter system being capable of handling such events.

公开(公告)号：US12261439B1

公开(公告)日：2025-03-25

申请号：US18797430

申请日：2024-08-07

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Lennart Petersen ,  Torsten Lund

IPC: H02J3/24 ,  H02J3/38

Abstract: A method for damping power oscillation in an electric power grid, comprising: performing a procedure for determination of a phase shift between a filtered voltage signal and a filtered frequency signal; based on the performed procedure, determining which one of the filtered voltage signal and filtered frequency signal is leading or lagging in relation to the other one of the filtered voltage signal and filtered frequency signal; based on the determination of which one of the filtered voltage signal and filtered frequency signal is leading or lagging, setting a gain of a power oscillation damping controller to be positive or negative; applying the power oscillation damping controller with the set gain so as to produce an output signal outputted from the power oscillation damping controller; and based on the produced output signal, controlling an injection of electric power to the grid so as to dampen power oscillation in the grid.

公开(公告)号：US12116985B2

公开(公告)日：2024-10-15

申请号：US17922413

申请日：2021-04-22

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Torsten Lund ,  John Godsk Nielsen ,  Gert Karmisholt Andersen ,  Kouroush Nayebi ,  Poul Brandt Christensen ,  Germán Claudio Tarnowski ,  Esmaeil Ebrahimzadehveshareh

IPC: F03D9/00 ,  F03D9/11 ,  F03D9/25 ,  H02P9/10 ,  H02J3/32 ,  H02J7/00 ,  H02P101/15 ,  H02P103/20

CPC classification number: F03D9/11 ,  F03D9/255 ,  H02P9/105 ,  F05B2270/1033 ,  H02J3/32 ,  H02J7/00712 ,  H02J2207/20 ,  H02J2207/50 ,  H02J2300/28 ,  H02P2101/15 ,  H02P2103/20

Abstract: The invention relates to a method for controlling power generation of a VSM wind turbine. The wind turbine comprises a machine side converter, a line side converter, a DC link, and an electric storage device electrically connected to the DC link. The method comprises determining a first power control signal to the machine side converter, determining a second power control signal for controlling a desired output power of the line side converter based on a storage device voltage error, and a power production reference, and determining a charging current reference for controlling charging and discharging of the electric storage device based on a DC-link voltage error.

公开(公告)号：US12031523B2

公开(公告)日：2024-07-09

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: F03D7/00 ,  F03D7/02 ,  H02P23/04

CPC classification number: F03D7/0272 ,  H02P23/04 ,  F05B2270/327

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：US20230344230A1

公开(公告)日：2023-10-26

申请号：US17832223

申请日：2022-06-03

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： John Godsk NIELSEN ,  Torsten Lund ,  Hamid Soltani ,  Gert Karmishoit Andersen

IPC: H02J3/16

CPC classification number: H02J3/16 ,  H02J2300/28

Abstract: A grid side inverter system includes a grid side inverter, a phase locked loop controller arranged to determine a phase of a dq-frame dependent on a monitored grid voltage vector in the dq-frame and a reference grid voltage vector in the dq-frame, a current reference decision unit arranged to generate a reduction of at least one of an active and a reactive current reference, wherein a decision to generate the reduction is based on an electrical parameter relating to the phase difference of the monitored grid voltage vector and the PLL vector, a current controller arranged to determine control signals for the grid side inverter for controlling generation of active and reactive power to the grid dependent on the active and reactive current references and monitored active and a reactive grid currents in the dq-frame.

公开(公告)号：US11495967B2

公开(公告)日：2022-11-08

申请号：US17278208

申请日：2019-09-11

Applicant: VESTAS WIND SYSTEMS A/S

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

IPC: H02J3/00 ,  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：US12176842B2

公开(公告)日：2024-12-24

申请号：US18506631

申请日：2023-11-10

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Esmaeil Ebrahimzadehveshareh ,  Torsten Lund ,  John Godsk Nielsen

IPC: H02P9/00 ,  H02P9/02

Abstract: The invention relates to a method for controlling a power generating unit. The method includes determining a virtual impedance value, determining a virtual grid power based on the virtual resistance value and the grid current, determining a virtual synchronous machine rotational speed and/or a synchronous machine angle of a virtual synchronous generator, and determining a voltage reference for controlling a line side converter to generate the desired reactive power based on the virtual synchronous machine rotational speed or angle, a virtual voltage and the voltage magnitude reference.

公开(公告)号：US12044214B2

公开(公告)日：2024-07-23

申请号：US18257965

申请日：2021-12-14

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Per Hagen Nielsen ,  Torsten Lund

IPC: H02J3/18 ,  F03D7/02 ,  F03D7/04 ,  H02J3/50

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.

公开(公告)号：US11728741B2

公开(公告)日：2023-08-15

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

CPC classification number: H02M5/42 ,  F03D9/25 ,  H02M1/44 ,  H02P9/02 ,  F05B2220/706

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.