公开(公告)号：US11962262B2

公开(公告)日：2024-04-16

申请号：US17419244

申请日：2019-12-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： John Godsk Nielsen ,  Torsten Lund ,  Esmaeil Ebrahimzadehveshareh

IPC: H02P9/10 ,  F03D7/02 ,  F03D9/25 ,  F03D13/20 ,  F03D80/80 ,  H02P101/15 ,  H02P103/20

CPC classification number: H02P9/105 ,  F03D7/0284 ,  F03D9/25 ,  F03D13/20 ,  F03D80/82 ,  F05B2270/1033 ,  H02P2101/15 ,  H02P2103/20

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 and the synchronous machine angle. The virtual synchronous machine rotational speed is determined based on a combination of a feedback of a damping power, a power reference for a desired power output of the wind turbine, a grid power supplied by the wind turbine to a power grid and a chopper power dissipated by the chopper and an inertial integration model, the synchronous machine angle is determined based on an integration of the synchronous machine rotational speed, and the damping power is determined based on the virtual synchronous machine rotational speed.

公开(公告)号：US11863112B2

公开(公告)日：2024-01-02

申请号：US17628174

申请日：2020-07-08

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Esmaeil Ebrahimzadehveshareh ,  Torsten Lund ,  John Godsk Nielsen

IPC: H02P9/00 ,  H02P9/02

CPC classification number: H02P9/006 ,  H02P9/02

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).

公开(公告)号：US11143167B2

公开(公告)日：2021-10-12

申请号：US16472371

申请日：2017-10-17

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Torsten Lund ,  John Godsk Nielsen

IPC: F03D17/00

Abstract: A method and apparatus for estimating a characteristic of a wind turbine electrical signal comprises buffering a sequence of sample values of the wind turbine electrical signal and a sequence of sample times corresponding with the sequence of sample values. The time periods represented by the sample times are variable. A sub-sequence of the buffered sample values to integrate is determined, based at least in part on a sum of the time periods. The characteristic is estimated by integrating the sample values in the sub-sequence.

公开(公告)号：US10590914B2

公开(公告)日：2020-03-17

申请号：US15572256

申请日：2016-06-08

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Tusitha Abeyasekera ,  Duy Duc Doan ,  Gert Karmisholt Andersen ,  Lars Helle ,  Søren Andersen ,  Tune Pedersen ,  John Godsk Nielsen

IPC: H03K17/945 ,  H03K17/955 ,  F03D7/02 ,  H02J3/38 ,  H02J3/42 ,  H02H7/26 ,  F03D9/25 ,  H02H9/00 ,  H02H7/085

Abstract: A method, converter arrangement, and controller are disclosed for connecting an output of a converter with an electrical grid to control inrush currents into a grid filter assembly connected with the output of the converter, the electrical grid carrying an alternating current (AC) signal having one or more phases. The method includes determining a voltage of the AC signal and operating, after pre-charging a direct current (DC) link of the converter to a predetermined voltage, the converter using open-loop voltage control to produce an AC output signal that substantially matches the AC signal of the electrical grid. The open-loop voltage control is based on the determined voltage of the AC signal. The method further includes closing, after a predetermined amount of time of operating the converter using the open-loop voltage control, a switching device to thereby connect the output of the converter with the electrical grid.

公开(公告)号：US10236810B2

公开(公告)日：2019-03-19

申请号：US15543322

申请日：2016-01-06

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Søren Andersen ,  John Godsk Nielsen ,  Duy Duc Doan

IPC: F03D7/02 ,  H02J3/36 ,  H02P9/00 ,  F03D7/04 ,  F03D9/25 ,  H02J3/38 ,  H02K7/18 ,  G01R27/16 ,  G01R31/34 ,  G01R31/42 ,  H02M5/458 ,  G01R31/40 ,  H02P101/15

Abstract: A method of monitoring a split wind-turbine-converter system with at least one generator-side converter and at least one grid-side converter arranged at distant locations, and a DC-link in the form of an elongated conductor arrangement with at least one positive and at least one negative conductor. The impedance of the DC-link conductor arrangement is determined by means of DC-voltage sensors. The voltages between the positive and the negative conductors are determined at the generator-side converter and at the grid-side converter, and the difference between the voltages is determined. The impedance of the DC-link conductor arrangement is determined by putting the determined voltage difference in relation to the DC current flowing through the DC-link conductor arrangement. If the impedance exceeds a given impedance threshold a fault state is recognized.

公开(公告)号：US10236686B2

公开(公告)日：2019-03-19

申请号：US15517881

申请日：2015-09-22

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： John Godsk Nielsen ,  Søren Andersen ,  Duy Duc Doan ,  Lars Helle

IPC: H02J3/18 ,  H02J3/16 ,  H02J3/38 ,  H02J3/28 ,  F03D7/02 ,  H02H7/06 ,  H02P9/04

Abstract: Techniques are described for operating a wind power facility in order to provide reactive power support to a power grid. The wind power facility may be a wind turbine or a wind power plant. An exemplary method includes increasing an amount of reactive power injected into the power grid, decreasing an amount of active power injected into the power grid by a certain amount, and dissipating and/or storing substantially the certain amount of active power.

公开(公告)号：US11901734B2

公开(公告)日：2024-02-13

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 Karmisholt 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：US10859064B2

公开(公告)日：2020-12-08

申请号：US16474501

申请日：2017-11-29

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian Biris ,  Duy Duc Doan ,  John Godsk Nielsen

IPC: F03D7/04 ,  F03D7/02 ,  H02P11/04

Abstract: A power conversion system for a wind turbine generator, comprising a machine-side converter having an AC voltage input from a generator and a DC voltage output to a DC link, wherein the machine-side converter is a modular multi-level converter comprising one or more converter legs corresponding to a respective one or more electrical phases of the generator, each of the converter legs comprising a plurality of converter cells, the system further comprising: a converter control module which provides the machine-side converter with a gate signal, and an electrical frequency estimation module configured to estimate the mean electrical frequency of the generator; wherein the gate signal has at least one mean switching frequency corresponding to at least one electrical phase of the generator; wherein the converter control module is configured to modulate the mean switching frequency of the gate signal in dependence on the mean electrical frequency of the generator.

公开(公告)号：US10700624B2

公开(公告)日：2020-06-30

申请号：US16326988

申请日：2017-08-11

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Gert Karmisholt Andersen ,  Kent Tange ,  Søren Andersen ,  Duy Duc Doan ,  Jens Peter Biltoft ,  Lars Helle ,  John Godsk Nielsen

IPC: H02P9/30 ,  H02P9/02 ,  H02P101/15 ,  F03D9/25 ,  H02M5/458 ,  H02M5/44 ,  H02M1/00

Abstract: A method of controlling a wind turbine generator (1) comprising an electrical generator (10) and a power converter (12), the power converter (12) comprising an electrical switch (14a, 14b) that is configured to process electrical power produced by the electrical generator (10), the method comprising: controlling an output from the electrical switch (14a, 14b) using a variable pulse-width modulated control signal, thereby to control characteristics of output power from the power converter (12); acquiring sample data (26) relating to an electronic signal within the wind turbine generator (1), wherein the sample data (26) is used for controlling the wind turbine generator (1); and dynamically adjusting a frequency (30) at which the sample data is acquired to synchronise data acquisition with a carrier frequency (24) of the control signal.

公开(公告)号：US10483865B2

公开(公告)日：2019-11-19

申请号：US15030316

申请日：2014-10-14

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Tusitha Abeyasekera ,  Duy Duc Doan ,  Lars Helle ,  Allan Holm Jørgensen ,  John Godsk Nielsen ,  Søren Andersen

IPC: H02M5/42 ,  H02J3/28 ,  H02J3/38 ,  H02M5/458 ,  H02M7/219 ,  H02M7/493 ,  H02H3/10 ,  H02H7/122 ,  H02M1/12 ,  H02M1/32 ,  H03H7/01 ,  F03D9/25 ,  H02M7/48 ,  H02M7/23 ,  H02M1/00 ,  G01R31/40

Abstract: A wind turbine generator 1 supplies three-phase a.c. current of variable voltage and variable frequency to two pairs of rectifiers 4a, 4b and 4c, 4d which generate respective d.c. outputs connected to positive, negative and neutral d.c. conductors 6, 7, 8. The outputs from each pair of rectifiers are connected together, and the outputs from the two pairs are connected in series to create a high-voltage d.c. output. Inverters 10a, 10b, 10c, 10d then convert the d.c. power to a.c. at a fixed frequency and voltage suitable for connection to the mains grid. To reduce the effect of common-mode noise, a capacitor is connected between the 1 neutral conductor 7 and earth, and a respective filter circuit 30 is connected between each of the a.c. outputs of the inverters 10a, 10b, 10c, 10d and earth. To reduce the effect of voltage surges during lightning, a surge protection device is also connected between the neutral d.c. conductor 7 and earth. Any imbalance in the current in the positive and negative conductors 6, 8 is compensated by detecting the presence of current flowing in the neutral conductor 7. Power supplied to auxiliary circuits from the output of one of the inverters, e.g. 10a, of the wind turbine is measured, and any resulting imbalance between the current in the positive and negative conductors is compensated. In the event of an earth-leakage fault in the conductors connecting the a.c. outputs of the inverters to the grid, when isolated, isolation detection relays 25 are provided.