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    CONVERTERS FOR WIND TURBINE GENERATORS
    3.
    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

    申请人： VESTAS WIND SYSTEMS A/S

    发明人： Tusitha ABEYASEKERA ,  Duy Duc DOAN ,  Lars HELLE ,  Allan Holm JØRGENSEN ,  John Godsk NIELSEN ,  Søren ANDERSEN

    IPC分类号： H02M5/42 ,  F03D9/00 ,  H02M1/12 ,  H02M1/32 ,  H03H7/01

    CPC分类号： 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

    摘要： 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.

    摘要翻译： 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。

    FAULT TOLERANT WIND TURBINE CONVERTER SYSTEM
    4.
    发明申请
    FAULT TOLERANT WIND TURBINE CONVERTER SYSTEM 审中-公开

    公开(公告)号：US20180115163A1

    公开(公告)日：2018-04-26

    申请号：US15566025

    申请日：2016-04-11

    申请人： VESTAS WIND SYSTEMS A/S

    发明人： John Godsk NIELSEN ,  Søren ANDERSEN ,  Lars HELLE ,  Duy Duc DOAN

    IPC分类号： H02J3/34 ,  H02M5/42

    CPC分类号： H02J3/34 ,  H02J3/36 ,  H02J3/386 ,  H02M5/42 ,  H02M2001/325 ,  Y02E10/763 ,  Y02E60/60

    摘要： In a full-scale converter system both the grid-side inverter unit and the generator-side inverter unit have a series convection of parallel inverters and form a generator-side and grid-side voltage-center-point at a voltage level between those of the inverters connected in series. The voltage-center-points are electrically connected by a center-line conductor that has a cross-section between 30% and 70% of that of a positive or negative potential conductor. The converter system continues conversion operation in the event of a fault in an inverter of a first converter-string, with non-faulty inverters of the converter system, as the center-line conductor is dimensioned by said cross-section to carry a compensation current resulting from an unbalanced active power-output.

    WIND-TURBINE CONVERTER CONTROL FOR MODULAR STRING CONVERTERS
    5.
    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

    申请人： VESTAS WIND SYSTEMS A/S

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

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

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

    摘要： 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.

    WIND TURBINE GENERATOR CONTROL METHOD AND SYSTEM
    8.
    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

    申请人： VESTAS WIND SYSTEMS A/S

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

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

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

    摘要： 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.

    CONTROLLED INRUSH CURRENT FOR CONVERTER-CONNECTED GRID FILTER
    9.
    发明申请
    CONTROLLED INRUSH CURRENT FOR CONVERTER-CONNECTED GRID FILTER 审中-公开

    公开(公告)号：US20180112647A1

    公开(公告)日：2018-04-26

    申请号：US15572256

    申请日：2016-06-08

    申请人： VESTAS WIND SYSTEMS A/S

    发明人： Tusitha ABEYASEKERA ,  Duy Duc DOAN ,  Gert Karmisholt ANDERSEN ,  Lars HELLE ,  Søren ANDERSEN ,  Tune Pedersen ,  John Godsk Nielen

    IPC分类号： F03D7/02 ,  H02J3/38 ,  H02H7/26 ,  H02J3/42

    摘要： 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.