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.

公开(公告)号：US20170244251A1

公开(公告)日：2017-08-24

申请号：US15517881

申请日：2015-09-22

Applicant: VESTAS WIND SYSTEMS A/S

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

IPC: H02J3/18 ,  F03D7/02 ,  H02H7/06 ,  H02P9/04 ,  H02J3/28 ,  H02J3/16 ,  H02J3/38

CPC classification number: H02J3/1885 ,  F03D7/0272 ,  F03D7/0284 ,  F05B2270/1033 ,  H02H7/067 ,  H02J3/16 ,  H02J3/18 ,  H02J3/28 ,  H02J3/386 ,  H02P9/04 ,  Y02E10/723 ,  Y02E10/763 ,  Y02E40/34

Abstract: The present invention relates to a method for operating a wind power facility in order to provide reactive power support to a power grid, the method comprising the step of increasing an amount of reactive power injected into the power grid, decreasing an amount of active power injected into the power grid by a certain amount, and dissipating and/or storing essentially said certain amount of active power in power dissipation and/or power storage means. The wind power facility may comprise a wind turbine or a wind power plant.

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.

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。

公开(公告)号：US20210376749A1

公开(公告)日：2021-12-02

申请号：US17278197

申请日：2019-09-11

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian BIRIS ,  Kent TANGE ,  Gert Karmishoit ANDERSEN ,  Duy Duc DOAN ,  Torsten LUND ,  Lars MEYER

IPC: H02M5/458 ,  H02P9/02

Abstract: This invention concerns a method of controlling a line side converter of a power converter system operating in an over-modulation range. The line side converter comprises a controller comprising a feedback control module configured to output a feedback control signal for modifying a drive signal received by a modulator. The method comprises determining a modulation index within the over-modulation range; and, controlling the feedback control module to adjust the feedback control signal based on the modulation index.

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.

公开(公告)号：US20180112647A1

公开(公告)日：2018-04-26

申请号：US15572256

申请日：2016-06-08

Applicant: VESTAS WIND SYSTEMS A/S

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

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

Abstract: 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.

公开(公告)号：US20170358997A1

公开(公告)日：2017-12-14

申请号：US15541217

申请日：2015-12-08

Applicant: VESTAS WIND SYSTEMS A/S

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

IPC: H02M5/458 ,  H02P101/15 ,  H02M1/00 ,  F03D9/25

CPC classification number: H02M5/4585 ,  F03D9/255 ,  H02M2001/0025 ,  H02M2001/0077 ,  H02P2101/15 ,  Y02E10/76

Abstract: A method of setting a reference DC-link voltage of a wind-turbine converter system is provided. At least at least one DC voltage demand from at least one generator-side inverter and at least one DC voltage demand are received from at least one grid-side inverter. A generator-side DC voltage demand value on the basis of the at least one DC voltage demand received from the at least one generator-side inverter. Also a grid-side DC voltage demand value is determined on the basis of the at least one DC voltage demand received from the at least one grid-side inverter. The highest DC voltage demand value out of the generator-side and grid-side DC voltage demand values is chosen. This chosen value corresponds to the set reference DC-link voltage.