公开(公告)号：WO2020057707A2

公开(公告)日：2020-03-26

申请号：PCT/DK2019/050274

申请日：2019-09-19

Applicant: VESTAS WIND SYSTEMS A/S

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

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：WO2019120406A1

公开(公告)日：2019-06-27

申请号：PCT/DK2018/050329

申请日：2018-12-06

Applicant: VESTAS WIND SYSTEMS A/S

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

IPC: H02M7/5395 ,  H02M5/458 ,  H02P27/08 ,  F03D7/02 ,  H02J3/38 ,  H02P9/10 ,  G01R31/02

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：WO2021129914A1

公开(公告)日：2021-07-01

申请号：PCT/DK2020/050396

申请日：2020-12-18

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： EBRAHIMZADEHVESHAREH, Esmaeil ,  FABER, Mark ,  CHRISTENSEN, Poul Brandt ,  ANDERSEN, Gert Karmisholt ,  LUND, Torsten

IPC: 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：WO2020135904A1

公开(公告)日：2020-07-02

申请号：PCT/DK2019/050390

申请日：2019-12-16

Applicant: VESTAS WIND SYSTEMS A/S

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

IPC: H02J3/24 ,  H02J3/38 ,  H02J3/16

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：WO2019120405A1

公开(公告)日：2019-06-27

申请号：PCT/DK2018/050328

申请日：2018-12-06

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： ANDERSEN, Gert Karmisholt ,  LUND, Torsten ,  DOAN, Duy Duc ,  RABI, Morteza ,  DYRLUND, Poul Møhl

IPC: H02H5/04 ,  F03D7/02

CPC classification number: F03D7/0272 ,  F03D7/02 ,  F03D17/00 ,  F05B2270/3032 ,  H02H1/04 ,  H02H5/04 ,  H02M1/32 ,  H02M5/4585

Abstract: METHOD OF CONTROLLING A WIND TURBINE GENERATOR A method of controlling a wind turbine generator (1) comprising a power converter (22) and at least one circuit breaker (25, 41). The method comprises determining a condition of the circuit breaker (25, 41) and modifying one or more operational parameters of the power converter (22) in accordance with the condition of the circuit breaker (25, 41). In particular, the invention proposes that the converter (22) is derated if one or more of the circuit breakers (25, 41) is close to violating a protection characteristic, thereby avoiding tripping of the circuit breaker (25, 41) and the associated lost production. [Figure 3]

公开(公告)号：WO2018121820A1

公开(公告)日：2018-07-05

申请号：PCT/DK2017/050386

申请日：2017-11-23

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： ANDERSEN, Gert Karmisholt ,  DOAN, Duy Duc ,  LUND, Torsten ,  KNUDSEN, Morten Risskov ,  TANGE, Kent

IPC: H02J3/38

Abstract: A power reference management module (52) for a power converter (22) of a wind turbine generator (1), the power reference management module (52) comprising: an input arranged to receive multiple power reference values; a processor (58) arranged to determine, based on the received power reference values, an active power target and a reactive power target; and an output arranged to transmit the active power target and the reactive power target to the power converter (22).

公开(公告)号：WO2018113862A1

公开(公告)日：2018-06-28

申请号：PCT/DK2017/050344

申请日：2017-10-17

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： LUND, Torsten ,  NIELSEN, John Godsk

IPC: G01R19/25 ,  F03D7/02

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：WO2022002322A1

公开(公告)日：2022-01-06

申请号：PCT/DK2021/050176

申请日：2021-06-03

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： YIN, Bo ,  NAYEBI, Kouroush ,  LUND, Torsten

IPC: H02J3/38 ,  H02J3/50 ,  H02J2300/28 ,  H02J3/381

Abstract: Aspects of the present invention relate to a method (100) for controlling a plurality of renewable energy generators (14). The method (100) comprises: determining (102) preliminary reactive power set points for the generators (14) based on a reactive power reference value; determining (104) generator-based and voltage-based reactive power limits for the generators (14); generating (106) dispatch signals for requesting reactive power from the generators based on the preliminary set point and the limits; and dispatching (108) the dispatch signals to the generators (14). The generator-based reactive power limits correspond to the reactive power capability of the generator. The voltage-based limits are determined by: determining (112) a terminal voltage of the generator; comparing (114) the determined terminal voltage to a voltage limit; and determining (116) the voltage-based reactive power limit based on the comparison.

公开(公告)号：WO2021170189A1

公开(公告)日：2021-09-02

申请号：PCT/DK2021/050036

申请日：2021-02-03

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： WU, Dan ,  TARNOWSKI, Germán Claudio ,  LUND, Torsten ,  NAYEBI, Kouroush ,  WEI, Mu ,  MERRILD, Uffe C.

IPC: H02J3/38 ,  H02J3/16 ,  H02J3/46

Abstract: A method for controlling a current injected to a power grid (2) from a renewable power plant (1), in response to a voltage event in the power grid (2), is disclosed. Occurrence of a voltage event in the power grid (2) is detected. At least a current at a point of common coupling (3) between the renewable power plant (1) and the power grid (2) is determined, and the determined current is provided to a power plant controller (4). The power plant controller (4) derives individual current setpoint corrections for at least some wind turbines (5) within the renewable power plant (1), based on the determined current, and dispatches each derived current setpoint correction to wind turbine controllers (6) of the corresponding wind turbines (5). The wind turbine controllers (6) control a current output of the respective wind turbines (5), based on measurements of current and/or voltage at a point of connection (8) between the wind turbine (5) and an internal grid (7) of the renewable power plant (1), and by taking the current setpoint correction dispatched from the power plant controller (4) into account.

公开(公告)号：WO2020078517A1

公开(公告)日：2020-04-23

申请号：PCT/DK2019/050245

申请日：2019-08-20

Applicant: VESTAS WIND SYSTEMS A/S

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

IPC: H02J3/38 ,  H02J3/48 ,  H02J3/50

Abstract: Embodiments provide for the control of a power plant including several generators by setting a reference frame for the generators with a first and a second axis; measuring a grid demand voltage at the shared connection point; determining active and reactive currents required at the shared connection point based on the grid demand voltage and grid codes; transforming the active and reactive currents required at the shared connection point to the reference frame where the first axis defines a first current set point and the second axis defines a second current set point; and dispatching the first and second current set points to generator controllers associated with each generator. Current set points may be generated for positive/negative frames, direct quadrature frames, real/imaginary frames and may be set evenly for all generators or adjusted per generator.