-
公开(公告)号：US11563385B2
公开(公告)日：2023-01-24
申请号：US17562731
申请日：2021-12-27
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Ciprian Biris , Cem Özgür Gerçek , Lars Helle , Duy Duc Doan , Tune Pedersen
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 including 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：US11495967B2
公开(公告)日：2022-11-08
申请号：US17278208
申请日：2019-09-11
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Torsten Lund , Ciprian Biris , Kent Tange , Duy Duc Doan , Gert Karmisholt Andersen
Abstract: This invention relates to a method of controlling at least one wind turbine of a plurality of wind turbines connected to an electrical grid at a predefined point in the electrical grid. The wind turbine comprises a DC link connecting a generator side converter to a line side converter, where the line side converter is controlled according to a modulation index requested by a power converter controller. The method comprises determining a harmonic frequency signal indicative of a harmonic frequency value at the predefined point in the electrical grid; determining a deviation between the harmonic frequency signal and a permissible harmonic frequency value; determining a permissible modulation index based on the deviation; comparing the permissible modulation index to the modulation index requested by the power converter controller; and, altering a DC link voltage set-point based on the comparison between the permissible modulation index and the requested modulation index.
-
公开(公告)号：US11286904B2
公开(公告)日：2022-03-29
申请号：US16957100
申请日：2018-12-05
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Gert Karmisholt Andersen , Lars Helle , Poul Møhl Dyrlund , Morteza Rabi , Duy Duc Doan
Abstract: A method for use in controlling a wind turbine generator of a wind power plant based on a condition of a power converter or a component forming part of a power converter in the wind power plant. The method comprises determining the initial condition of the power converter or a component forming part of a power converter and determining the evolution of the condition from the initial condition based on notional power reference values of the wind turbine generator. The method further comprises comparing the evolution of the condition to a predetermined threshold and determining, from the comparison, a time period by which the condition of the power converter or a component forming part of a power converter will substantially equal the predetermined threshold.
-
公开(公告)号：US10590914B2
公开(公告)日：2020-03-17
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 Nielsen
IPC: H03K17/945 , H03K17/955 , F03D7/02 , H02J3/38 , H02J3/42 , H02H7/26 , F03D9/25 , H02H9/00 , H02H7/085
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：US10236810B2
公开(公告)日：2019-03-19
申请号：US15543322
申请日：2016-01-06
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Søren Andersen , John Godsk Nielsen , Duy Duc Doan
IPC: F03D7/02 , H02J3/36 , H02P9/00 , F03D7/04 , F03D9/25 , H02J3/38 , H02K7/18 , G01R27/16 , G01R31/34 , G01R31/42 , H02M5/458 , G01R31/40 , H02P101/15
Abstract: A method of monitoring a split wind-turbine-converter system with at least one generator-side converter and at least one grid-side converter arranged at distant locations, and a DC-link in the form of an elongated conductor arrangement with at least one positive and at least one negative conductor. The impedance of the DC-link conductor arrangement is determined by means of DC-voltage sensors. The voltages between the positive and the negative conductors are determined at the generator-side converter and at the grid-side converter, and the difference between the voltages is determined. The impedance of the DC-link conductor arrangement is determined by putting the determined voltage difference in relation to the DC current flowing through the DC-link conductor arrangement. If the impedance exceeds a given impedance threshold a fault state is recognized.
-
Patent Agency Ranking
公开(公告)号：US10236686B2
公开(公告)日：2019-03-19
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
Abstract: Techniques are described for operating a wind power facility in order to provide reactive power support to a power grid. The wind power facility may be a wind turbine or a wind power plant. An exemplary method includes 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 substantially the certain amount of active power.
-
公开(公告)号：US09347434B2
公开(公告)日：2016-05-24
申请号：US14362052
申请日：2012-12-21
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Amit Kumar Gupta , Hock Heng Thia , Duy Duc Doan , Gert Karmisholt Andersen
CPC classification number: F03D7/0264 , F03D9/255 , H02J3/386 , H02P9/08 , H02P29/024 , H02P29/0241 , Y02E10/723 , Y02E10/763
Abstract: A wind turbine is provided. The wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator, an energy dissipating unit and a controller. The power converter comprises a generator-side converter, a grid-side converter and a DC (direct current) link there between. The energy dissipating unit is operatively coupled to the DC-link. The controller is adapted to activate the energy dissipating unit to dissipate energy from the DC-link in response to a shutdown request.
Abstract translation: 提供风力涡轮机。 风力涡轮机包括发电机，用于转换由发电机产生的电力的至少一部分的功率转换器，能量消散单元和控制器。 功率转换器包括发生器侧转换器，电网侧转换器和其间的DC（直流）连接。 能量消耗单元可操作地耦合到DC链路。 控制器适于响应于关闭请求而激活能量消散单元以从DC链路消散能量。
-
公开(公告)号：US11894672B2
公开(公告)日：2024-02-06
申请号：US18004879
申请日：2021-07-06
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Luis Miguel Calhau Gonçalves , Kenneth G. Hansen , Hans Christian Bisgaard-Clausen , Duy Duc Doan , Hamid Soltani , Poul Møhl Dyrlund , Kent Tange
IPC: H02H7/06 , H02H3/00 , H02J3/38 , H02P9/00 , H02P101/15
CPC classification number: H02H7/06 , H02H3/006 , H02J3/381 , H02P9/006 , H02P2101/15
Abstract: A system for a wind turbine that includes a protection system interfaced to a circuit breaker system and a sensing system. The protection system is configured to determine an operational mode of the wind turbine by monitoring at least two parameters determine a parameter set comprising a plurality of operational parameters based on a determined operational mode, and an associated set of expected values corresponding to the parameter set, determine actual values corresponding to the determined parameter set, identify a fault condition in the event that the determined set of actual values of the operational parameters do not correspond to the determined set of expected values of the operational parameters, and implement a protection action based on the identified fault condition.
-
公开(公告)号：US11211878B2
公开(公告)日：2021-12-28
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
Abstract: A Direct Current (DC) chopper may be integrated 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 including at least the power transistors of the MMC cell. The safe discharge of both cell capacitors and DC-link capacitors in different operating conditions is performed using Insulated-Gate Bipolar Transistors (IGBTs) and chopper resistors of an MMC cell.
-
公开(公告)号：US09574548B2
公开(公告)日：2017-02-21
申请号：US14362027
申请日：2012-12-07
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Duy Duc Doan
CPC classification number: F03D7/0296 , F03D7/0244 , F03D7/0264 , F03D7/0272 , F03D9/11 , F03D9/255 , H02P3/18 , H02P9/08 , Y02E10/723
Abstract: The present invention relates to a method for controlled shutdown of wind turbines. The method involves using a generator side converter, and optionally a DC chopper, as a generator load during controlled shutdown. In this way gearbox back-lashing and drive train oscillations can be avoided. The present invention also relates to a wind turbine capable of performing controlled shutdown in accordance with the before-mentioned method.
Abstract translation: 本发明涉及风力发电机的受控停机方法。 该方法包括在受控停机期间使用发电机侧转换器和可选的DC斩波器作为发电机负载。 这样就可以避免齿轮箱的回扣和传动系的摆动。 本发明还涉及一种能够根据前述方法执行受控停机的风力涡轮机。
-
-
-
-
-
-
-
-
-
Search Results
25
records
(took 0.028 seconds)
