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    Voltage control on a wind turbine transformer with multiple windings
    2.
    发明授权
    Voltage control on a wind turbine transformer with multiple windings 有权

    公开(公告)号：US11728650B2

    公开(公告)日：2023-08-15

    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 ,  F03D9/25 ,  H02K7/18 ,  H02M7/44 ,  H02P9/02

    CPC classification number: H02J3/18 ,  F03D9/255 ,  H02K7/1838 ,  H02M7/44 ,  H02P9/02

    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.

    Power generating unit with virtual synchronous generator with current limitation
    3.
    发明授权
    Power generating unit with virtual synchronous generator with current limitation 有权

    公开(公告)号：US12176842B2

    公开(公告)日：2024-12-24

    申请号：US18506631

    申请日：2023-11-10

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： Esmaeil Ebrahimzadehveshareh ,  Torsten Lund ,  John Godsk Nielsen

    IPC: H02P9/00 ,  H02P9/02

    Abstract: The invention relates to a method for controlling a power generating unit. The method includes determining a virtual impedance value, determining a virtual grid power based on the virtual resistance value and the grid current, determining a virtual synchronous machine rotational speed and/or a synchronous machine angle of a virtual synchronous generator, and determining a voltage reference for controlling a line side converter to generate the desired reactive power based on the virtual synchronous machine rotational speed or angle, a virtual voltage and the voltage magnitude reference.

    Method for controlled shutdown of wind power facility
    4.
    发明授权
    Method for controlled shutdown of wind power facility 有权

    公开(公告)号：US10359025B2

    公开(公告)日：2019-07-23

    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 ,  H02P3/18 ,  H02P3/22 ,  H02P9/08

    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.

    Wind-turbine converter control for modular string converters
    5.
    发明授权
    Wind-turbine converter control for modular string converters 有权

    公开(公告)号：US10250042B2

    公开(公告)日：2019-04-02

    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: H02M5/45 ,  H02J3/38 ,  F03D7/04 ,  F03D9/25 ,  H02P101/15 ,  H02M1/00

    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.

    Virtual synchronous generator with active damping
    7.
    发明授权
    Virtual synchronous generator with active damping 有权

    公开(公告)号：US11715955B2

    公开(公告)日：2023-08-01

    申请号：US17419251

    申请日：2019-12-16

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： John Godsk Nielsen ,  Torsten Lund ,  Esmaeil Ebrahimzadehveshareh

    IPC: F03D7/00 ,  H02J3/24 ,  F03D7/02 ,  H02J3/38

    CPC classification number: H02J3/24 ,  F03D7/0284 ,  H02J3/381 ,  H02J2300/28

    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.

    Adaptive active power control in renewable energy power plants
    8.
    发明授权
    Adaptive active power control in renewable energy power plants 有权

    公开(公告)号：US10958071B2

    公开(公告)日：2021-03-23

    申请号：US16956923

    申请日：2018-11-20

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： Manoj Gupta ,  Ravi Kumar ,  Janakiraman Sivasankaran ,  Thomas Schmidt Grau ,  Martin Ansbjerg Kjær ,  Kouroush Nayebi ,  John Godsk Nielsen ,  Jesper Sandberg Thomsen

    IPC: H02J3/00 ,  H02J3/38 ,  H02J3/24 ,  H02J3/12

    Abstract: A method for operating a renewable energy power plant comprising a plurality of renewable energy generators. The method comprises: identifying a predetermined condition of the renewable energy power plant, of the grid, or of the connection between the renewable energy power plant and the grid, the predetermined condition indicating a weak grid interconnection between the renewable energy power plant and the grid; and controlling each renewable energy generator in an adaptive active power mode in response to recovery of the grid from a voltage deviation. The adaptive active power mode comprises: determining a thermal capacity of a chopper resistor of the renewable energy generator; calculating, based upon the determined thermal capacity, a limit level of rate of change of active power output that may be implemented by the renewable energy generator; and operating the renewable energy generator to output active power at the calculated rate of change limit level.

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