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    CONTROLING A WIND TURBINE DURING OVER-VOLTAGE RIDE THROUGH
    1.
    发明申请
    CONTROLING A WIND TURBINE DURING OVER-VOLTAGE RIDE THROUGH 审中-公开

    公开(公告)号：US20190219029A1

    公开(公告)日：2019-07-18

    申请号：US16144451

    申请日：2018-09-27

    Applicant: VESTAS WIND SYSTEMS A/S

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

    IPC: F03D7/02 ,  F03D9/25 ,  H02J3/38

    Abstract: Controlling a power converters during over voltage condition. A wind turbine signal is monitored for detection of an over voltage of the grid and upon detection of the over voltage, an over-modulation mode is initiated wherein the grid side converter is operated with a modulation index being increased in an over-modulation range at least during a sub-period of the over-modulation mode, and upon the detection of the operational condition, a DC-voltage adjustment mode is initiated wherein the DC voltage of the DC link is decreased from a second voltage level towards a first voltage level at least during a sub-period of the DC-voltage adjustment mode.

    A METHOD OF OPERATING A POWER GENERATION SYSTEM
    5.
    发明申请
    A METHOD OF OPERATING A POWER GENERATION SYSTEM 有权

    公开(公告)号：US20210351714A1

    公开(公告)日：2021-11-11

    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

    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.

    FAULT TOLERANT WIND TURBINE CONVERTER SYSTEM
    8.
    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

    Applicant: VESTAS WIND SYSTEMS A/S

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

    IPC: H02J3/34 ,  H02M5/42

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

    Abstract: 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
    9.
    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.

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