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    WIND-TURBINE CONVERTER CONTROL FOR MODULAR STRING CONVERTERS
    11.
    发明申请
    WIND-TURBINE CONVERTER CONTROL FOR MODULAR STRING CONVERTERS 审中-公开

    公开(公告)号：US20170331295A1

    公开(公告)日：2017-11-16

    申请号：US15521910

    申请日：2015-10-19

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： Tusitha ABEYASEKERA ,  Duy Duc DOAN ,  Lars HELLE ,  Søren ANDERSEN ,  John Godsk NIELSEN

    IPC: H02J3/38 ,  F03D7/04 ,  F03D9/25 ,  H02M1/00 ,  H02P101/15

    CPC classification number: H02J3/386 ,  F03D7/042 ,  F03D9/255 ,  H02M2001/0003 ,  H02P2101/15 ,  Y02E10/723 ,  Y02E10/725 ,  Y02E10/763

    Abstract: A wind turbine converter system with a rectifier and an inverter and a converter controller has at least first and second converter strings. The converter system is controlled by a master-converter controller and a slave-converter controller. The master-converter controller controls the first converter string and the slave-converter controller controls the second converter string. The master-converter controller receives commands from a superordinate wind turbine controller, provides the slave-converter controller with string-control commands on the basis of the superordinate control commands, and controls the conversion operation of the first converter string on the basis of the superordinate control command. The slave-converter controller receives the string-control commands from the master-converter controller and controls the conversion operation of the second converter string on the basis of the string-control commands received. The first and the second converter strings can be arranged in a bipolar configuration giving access to a neutral point. Fault detection can be performed based on current through the neutral. The system is capable of fault ride-through. Also, in case of failure of the master-converter controller, a redundant unit takes its place.

    GRID SIDE INVERTER SYSTEM ARRANGED FOR CONTROLLING CURRENT INJECTION WHEN A PHASE LOCKED LOOP CONTROLLER IS MISALIGNED
    12.
    发明公开
    GRID SIDE INVERTER SYSTEM ARRANGED FOR CONTROLLING CURRENT INJECTION WHEN A PHASE LOCKED LOOP CONTROLLER IS MISALIGNED 审中-公开

    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.

    CONTROL SYSTEM FOR MODULAR MULTILEVEL CONVERTER
    13.
    发明申请
    CONTROL SYSTEM FOR MODULAR MULTILEVEL CONVERTER 审中-公开

    公开(公告)号：US20190338753A1

    公开(公告)日：2019-11-07

    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.

    A METHOD FOR CONTROLLED SHUTDOWN OF WIND POWER FACILITY
    15.
    发明申请
    A METHOD FOR CONTROLLED SHUTDOWN OF WIND POWER FACILITY 审中-公开

    公开(公告)号：US20170211546A1

    公开(公告)日：2017-07-27

    申请号：US15326801

    申请日：2015-07-02

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： Duy Duc DOAN ,  John Godsk NIELSEN ,  Per BISGAARD

    IPC: F03D7/02 ,  F03D9/25 ,  H02P9/08

    CPC classification number: F03D7/0264 ,  F03D7/0272 ,  F03D9/255 ,  H02P3/18 ,  H02P3/22 ,  H02P9/08 ,  Y02E10/723 ,  Y02E10/725

    Abstract: The present invention relates to a method for shutting down a wind power facility, said wind power facility comprising a power generator, a power converter comprising generator side and grid side converters being separated by an intermediate DC circuit, and power dissipation or power storage means being operatively connected to the intermediate DC circuit, the method comprising the steps of determining that the wind power facility needs to be shut down, and operating the generator side converter in accordance with a load time curve during shutdown of the wind power facility in order to avoid overloading of selected generator side converter components and the power dissipation or power storage means. Moreover, the present invention relates to a wind power facility for performing this method.

    CONVERTERS FOR WIND TURBINE GENERATORS
    16.
    发明申请
    CONVERTERS FOR WIND TURBINE GENERATORS 审中-公开
    风力发电机转换器

    公开(公告)号：US20160241153A1

    公开(公告)日：2016-08-18

    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 ,  F03D9/00 ,  H02M1/12 ,  H02M1/32 ,  H03H7/01

    CPC classification number: H02M5/42 ,  F03D9/255 ,  G01R31/40 ,  H02H3/105 ,  H02H7/122 ,  H02J3/28 ,  H02J3/386 ,  H02M1/12 ,  H02M1/32 ,  H02M5/4585 ,  H02M7/219 ,  H02M7/23 ,  H02M7/493 ,  H02M2001/0077 ,  H02M2001/123 ,  H02M2007/4822 ,  H03H7/0107 ,  Y02E10/725 ,  Y02E10/726 ,  Y02E10/763 ,  Y02E10/766 ,  Y02E70/30

    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 In 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.

    Abstract translation: 风力发电机1提供三相交流电。 可变电压和可变频率的电流为两对整流器4a，4b和4c，4d，它们产生相应的直流。 输出连接到正，负和中性直流。 导体6,7,8。每对整流器的输出连接在一起，两对的输出串联连接，以产生高压直流。 输出。 逆变器10a，10b，10c，10d然后转换直流。 权力到a.c. 在固定的频率和电压适用于连接到电网。 为了降低共模噪声的影响，电容器连接在1个中性导体7和地之间，并且相应的滤波器电路30连接在每个直流电平之间。 逆变器10a，10b，10c，10d和地的输出。 为了减少雷击期间电压浪涌的影响，浪涌保护装置也连接在中性点间。 导体7和地球。 通过检测在中性导体7中流动的电流的存在来补偿正和负导体6,8中的电流的任何不平衡。从一个逆变器的输出，例如， 测量风力涡轮机的10a，并补偿正，负导体中的电流之间的任何不平衡。 在连接交流电的导体中发生漏电故障的情况。 当隔离的隔离检测继电器25被提供时，逆变器的输出到电网。

    VOLTAGE CONTROL ON A WIND TURBINE TRANSFORMER WITH MULTIPLE WINDINGS
    17.
    发明申请
    VOLTAGE CONTROL ON A WIND TURBINE TRANSFORMER WITH MULTIPLE WINDINGS 有权

    公开(公告)号：US20220014023A1

    公开(公告)日：2022-01-13

    申请号：US17372144

    申请日：2021-07-09

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： John Godsk NIELSEN ,  Torben Møller HANSEN

    IPC: H02J3/18 ,  H02K7/18 ,  H02P9/02 ,  H02M7/44 ,  F03D9/25

    Abstract: The invention relates to a method for operating a power system of a wind turbine. The power system comprises first and second parallel connected DC-to-AC converters and at least one transformer, where each transformer comprises a primary section connected to a power line, and where the at least one transformer comprises first and second secondary sections connected to outputs of the respective first and second DC-to-AC converters. The method comprises providing a reactive correction reference, changing first and second reactive powers generated by the respective first and second DC-to-AC converters according to the reactive correction reference, so that one of the first and second reactive powers is increased while the other is decreased with amounts corresponding to the reactive correction reference so that the first and second reactive powers are unequal.

    WIND TURBINE GENERATOR CONTROL METHOD AND SYSTEM
    19.
    发明申请
    WIND TURBINE GENERATOR CONTROL METHOD AND SYSTEM 审中-公开

    公开(公告)号：US20180335017A1

    公开(公告)日：2018-11-22

    申请号：US15777795

    申请日：2016-12-01

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： John Godsk NIELSEN ,  Duy Duc DOAN ,  Søren ANDERSEN ,  Gert Karmisholt ANDERSEN

    IPC: F03D7/04 ,  F03D7/02 ,  H02J3/38 ,  H02M5/458

    CPC classification number: F03D7/042 ,  F03D7/026 ,  F03D7/0264 ,  F05B2270/3201 ,  H02J3/386 ,  H02M5/4585 ,  Y02E10/723 ,  Y02E10/763

    Abstract: A method for controlling a wind turbine system including an electrical generator, a power converter system, a DC-link, and at least a grid-side breaker arrangement controllable between open and closed states, wherein the method comprises monitoring for the presence of a shutdown event and, in response to identifying the presence of a shutdown event, controlling the wind turbine into a production-ready state, comprising: i) controlling the grid-side breaker arrangement in the closed state; ii) disabling one or more drive signals to the power converter system; and iii) controlling the DC-link of the power converter system in a charged state. Advantageously, this approach reduces the frequency of use of the grid-side breaker arrangement which extends serviceable life considerably, and also allows the wind turbine system to be transitioned rapidly between an operating state and a production-ready state.

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