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.

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.

公开(公告)号：US20140252768A1

公开(公告)日：2014-09-11

申请号：US14206113

申请日：2014-03-12

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Shu Yu CAO ,  Anshuman TRIPATHI ,  Kim B. LARSEN ,  Gert Karmisholt ANDERSEN ,  Lars HELLE

IPC: F03D7/02

CPC classification number: F03D7/0272 ,  H02J3/386 ,  H02P9/48 ,  H02P21/141 ,  H02P2101/15 ,  Y02E10/763

Abstract: A method of controlling a wind turbine generator is provided, the wind turbine generator converting mechanical energy to electrical. The method comprises: determining an electromagnetic power reference representing the electromagnetic power generated by the wind turbine generator, wherein the electromagnetic power reference is determined based on a desired output of the wind turbine generator; controlling the electrical power generated by the wind turbine generator using a control signal, wherein the control signal is derived from the electromagnetic power reference and is modified in dependence on an inverse power function of the wind turbine generator by incorporating minimal copper loss constraint and stator voltage limiting constraint such that non-linearity of the wind turbine generator is compensated in the control loop and it operates at its maximum efficiency. One effect of the method is that classical linear control loop design can be employed in spite of the plant being a non-linear identity.

Abstract translation: 提供了一种控制风力发电机的方法，风力发电机将机械能转换为电力。 该方法包括：确定表示由风力涡轮发电机产生的电磁功率的电磁功率参考，其中基于风力涡轮发电机的期望输出来确定电磁功率基准; 使用控制信号来控制由风力涡轮发电机产生的电力，其中控制信号是根据电磁功率参考导出的，并且根据风力涡轮发电机的反功率函数，通过并入最小铜损约束和定子电压 使得风力涡轮发电机的非线性在控制回路中得到补偿，并以其最大效率运行。 该方法的一个效果是尽管植物是非线性身份，但是可以采用经典的线性控制回路设计。

公开(公告)号：US20220311354A1

公开(公告)日：2022-09-29

申请号：US17634959

申请日：2020-08-12

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Cem Özgür GERÇEK ,  Lars HELLE ,  Ciprian BIRIS

IPC: H02M7/483 ,  H02M1/32 ,  H02M7/5395 ,  H02J3/38

Abstract: This disclosure proposes procedures and systems for discharging system capacitors and de-energizing power transmission systems having Modular Multilevel Converter (MMC) topologies by intelligent control of MMC cell components including configuration of bypass and insert switches using integrated DC choppers to effectively de-energize MMC cell capacitors and/or DC-link capacitors under operating conditions such as after a normal stop, for protection against over-voltages, dumping turbine energy, and under certain hardware fault conditions.

公开(公告)号：US20220278604A1

公开(公告)日：2022-09-01

申请号：US17762326

申请日：2020-09-17

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Masoud PARKHOU ,  Lars HELLE ,  Cem Özgür GERÇEK

IPC: H02M1/00 ,  H02J7/00

Abstract: According to embodiments described herein a Modular Multilevel Converter (MMC) is pre-charged by: driving a bypass current from an auxiliary power source through a plurality of bypass switches included in a corresponding plurality of cells; in response to a summed voltage across a plurality of cell capacitors included in the plurality of cells satisfying a drive threshold, driving an insert current through a plurality of insert switches included in the plurality of cells; and in response to a voltage across a Direct Current (DC) link capacitor satisfying a pre-charge threshold when driving the insert current, opening a circuit breaker connecting the auxiliary power source with the plurality of cells and connecting a generator with external power line rails between which the DC link capacitor is connected.

公开(公告)号：US20210050796A1

公开(公告)日：2021-02-18

申请号：US16992051

申请日：2020-08-12

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian BIRIS ,  Cem Özgür GERÇEK ,  Lars HELLE ,  Duy Duc DOAN ,  Tune PEDERSEN

IPC: H02M7/483 ,  F03D7/04 ,  H02J3/38 ,  H02M1/32 ,  H02M5/458

Abstract: This disclosure proposes a topology that integrates a DC chopper into the Modular Multilevel Converter (MMC) cells of a power converter. The integrated DC chopper may include chopper resistors that may also be advantageously integrated into a heat sink for a power module comprising at least the power transistors of the MMC cell. Embodiments herein also describe a method for using an MMC cell's IGBTs and chopper resistors for providing a safe discharge of both cell capacitors and DC-link capacitors in different operating conditions.

公开(公告)号：US20190206617A1

公开(公告)日：2019-07-04

申请号：US16302557

申请日：2017-05-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Søren Viisholm TRANKJÆR ,  Lars HELLE ,  Torben PETERSEN

IPC: H01F38/14 ,  H02J3/38 ,  H01F38/18 ,  H02J50/10 ,  H02J7/02

Abstract: Aspects of the present disclosure are generally directed to using a rotary transformer to transfer power for a wind turbine generator. Certain aspects of the present disclosure are directed to a multi-rotor wind turbine. The multi-rotor wind turbine generally includes a plurality of rotors, a plurality of electrical generators, each coupled to one of the plurality of rotors, and one or more rotary transformers configured to transfer power between the electrical generators and a power grid. In some aspects, each rotary transformer comprises a first winding coupled to one or more electrical generators of the plurality of electrical generators, and a second winding magnetically coupled to the first winding and coupled to the power grid, wherein the first winding is rotatable with respect to the second winding.

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：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。