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    A METHOD OF OPERATING A POWER GENERATION SYSTEM
    2.
    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.

    WIND TURBINE POWER GENERATION COMPRISING AN AC-DC-AC CONVERTER AND A TRANSFORMER WITH A TAP CHANGER
    4.
    发明申请
    WIND TURBINE POWER GENERATION COMPRISING AN AC-DC-AC CONVERTER AND A TRANSFORMER WITH A TAP CHANGER 有权

    公开(公告)号：US20230048911A1

    公开(公告)日：2023-02-16

    申请号：US17794203

    申请日：2021-01-19

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： Ciprian BIRIS ,  Bo SUN

    IPC: H02J3/38 ,  H02J3/18 ,  H02J3/00

    Abstract: A method of operating a power generating system for a wind turbine connected to an electrical grid, the power generating system comprising a power generator, a converter, a transformer and a tap changer, the method comprising; monitoring a signal for detecting an over-voltage condition in the electrical grid which requires a reduction in the output voltage from the power generating system; initiating a convertor response mode configured to provide at least part of the required voltage reduction; and initiating a transformer response mode configured to provide at least part of the required voltage reduction; wherein the transformer response mode comprises operating the tap changer to adjust the output voltage from the power generating system.

    CONTROLING A WIND TURBINE DURING OVER-VOLTAGE RIDE THROUGH
    5.
    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.

    IMPROVEMENTS RELATING TO REACTIVE POWER SUPPORT IN WIND POWER PLANTS
    8.
    发明申请
    IMPROVEMENTS RELATING TO REACTIVE POWER SUPPORT IN WIND POWER PLANTS 审中-公开

    公开(公告)号：US20200076193A1

    公开(公告)日：2020-03-05

    申请号：US16468251

    申请日：2017-11-24

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： Ciprian BIRIS ,  Manoj GUPTA ,  Henrik MØLLER ,  Kouroush NAYEBI ,  Janakiraman SIVASANKARAN ,  Mu WEI ,  Hans Kristian BJØRN

    IPC: H02J3/18 ,  H02J3/38 ,  F03D9/25

    Abstract: A wind power plant system comprising: a plurality of wind turbine generators each having a corresponding generator controller, and a power plant controller for controlling the power generated by the wind power plant system; wherein at least some of the plurality of generator controllers are each configured to: generate a model that indicates the thermal capacity of one or more components of the wind turbine generator, determine power capacity data from the model, said data relating to: at least one reactive power supply level and a corresponding time limit for which that reactive power supply level may be maintained, and transmit to the power plant controller the determined power capacity data, wherein the power plant controller is operable to receive the power capacity data from the plurality of generator controllers and to transmit respective power references to the plurality of generator controllers to control the power generated by the wind power plant system.

    BALANCING REACTIVE CURRENT BETWEEN A DFIG STATOR AND A GRID-SIDE INVERTER
    9.
    发明申请
    BALANCING REACTIVE CURRENT BETWEEN A DFIG STATOR AND A GRID-SIDE INVERTER 审中-公开

    公开(公告)号：US20200274360A1

    公开(公告)日：2020-08-27

    申请号：US16062888

    申请日：2017-05-16

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： Ciprian BIRIS ,  Uffe C. MERRILD ,  Leif Svinth CHRISTENSEN ,  Gert Karmisholt ANDERSEN

    IPC: H02J3/18 ,  H02P9/00 ,  H02K7/18 ,  F03D7/02 ,  F03D9/25 ,  G05B15/02

    Abstract: Aspects of the present invention relate to a method for controlling an amount of reactive current provided from a wind turbine generator to a power grid during an abnormal power grid event, said wind turbine generator comprising a doubly-fed induction generator having a rotor and a stator, and a power converter coupling the rotor to the power grid, the power converter comprising a grid-side inverter, wherein the method comprises the step of balancing the reactive current provided to the power grid between a reactive stator current and a reactive grid-side inverter current, wherein the reactive grid-side inverter current is controlled in accordance with a reactive current capacity of a grid breaker receiving the reactive current provided by the grid-side inverter. Aspects of the present invention also relate to a wind turbine generator being capable of performing the method.

    FAULT RIDE THROUGH METHOD FOR LOAD IMPACT MINIMIZATION
    10.
    发明申请
    FAULT RIDE THROUGH METHOD FOR LOAD IMPACT MINIMIZATION 有权

    公开(公告)号：US20190093634A1

    公开(公告)日：2019-03-28

    申请号：US16143818

    申请日：2018-09-27

    Applicant: VESTAS WIND SYSTEMS A/S

    Inventor： Ciprian BIRIS ,  Uffe C. MERRILD ,  Leif Svinth CHRISTENSEN ,  Martin Ansbjerg KJÆR

    IPC: F03D9/25 ,  F03D7/02 ,  H02J3/18 ,  H02J3/38

    Abstract: Controlling a wind turbine during a grid fault where the grid voltage drops below a nominal grid voltage. After detection of a grid fault, the total current limit for the power converter output is increased to a total maximum overload current limit. Depending on whether active or reactive current generation is prioritized, an active or reactive current reference is determined. The active current reference is determined in a way so that a reduction in active power production due to the grid voltage drop is minimized and based on the condition that the vector-sum of the active output current and the reactive output current is limited according to the total maximum overload current limit, and a maximum period of time is determined in which the power converter can be controlled based on the active/reactive current references. Afterwards the power converter is controlled based on the active and reactive current references.

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