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公开(公告)号：US20220321041A1
公开(公告)日：2022-10-06
申请号：US17628174
申请日：2020-07-08
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Esmaeil EBRAHIMZADEHVESHAREH , Torsten LUND , John Godsk NIELSEN
Abstract: The invention relates to controlling a power generating unit. Aspects of the invention include determining a virtual impedance value (Zvir), determining a virtual grid power (Pvsm) based on the virtual resistance value (Rvir) and the grid current (Igrid), determining a virtual synchronous machine rotational speed (ωVSM) and/or a synchronous machine angle (θVSM) of a virtual synchronous generator, and determining a voltage reference (Vabc) for controlling a line side converter to generate the desired reactive power (Qgrid) based on the virtual synchronous machine rotational speed or angle (ωVSM, θVSM), a virtual voltage (ΔVαβ, ΔVdq) and the voltage magnitude reference (Vqref).
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公开(公告)号：US20170373625A1
公开(公告)日：2017-12-28
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: H02P9/00 , F03D9/25 , H02K7/18 , H02J3/36 , G01R31/42 , G01R27/16 , F03D7/02 , G01R31/34 , H02J3/38 , H02P101/15
CPC classification number: H02P9/006 , F03D7/0264 , F03D7/0284 , F03D7/04 , F03D9/255 , G01R27/16 , G01R31/343 , G01R31/40 , G01R31/42 , H02J3/36 , H02J3/386 , H02K7/1838 , H02M5/4585 , H02P2101/15 , H02P2201/03 , Y02E10/723 , Y02E10/725 , Y02E10/763 , Y02E60/60
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.
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公开(公告)号：US20160231365A1
公开(公告)日：2016-08-11
申请号：US15015426
申请日：2016-02-04
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Amit Kumar GUPTA , John Godsk NIELSEN , Liang YANG
IPC: G01R19/165 , H02K7/18 , F03D9/00 , G01R19/10
CPC classification number: G01R19/16533 , F03D7/00 , F03D7/0284 , F03D7/042 , F03D9/255 , F03D9/257 , F05B2270/337 , G01R19/10 , H02J3/26 , H02J3/386 , H02J2003/001 , H02K7/183 , H02P9/04 , Y02E10/723 , Y02E10/725 , Y02E10/763 , Y02E40/50
Abstract: A method for operating a power generation system coupled to a power grid during a grid unbalance event, a method for determining an injection current to be supplied into a power grid by a power generation system, and a method for addressing an asymmetric grid fault in a power grid connected to a power generation system are provided. The methods may be carried out based on a reactive or an active power/current priority.
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公开(公告)号：US20250062709A1
公开(公告)日：2025-02-20
申请号：US18723359
申请日：2022-12-15
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Torsten LUND , John Godsk NIELSEN , Esmaeil EBRAHIMZADEHVESHAREH
IPC: H02P21/22 , F03D7/02 , H02P21/05 , H02P21/18 , H02P101/15 , H02P103/20
Abstract: Limiting generator loads in a wind turbine having a power converter with a line side inverter configured as a grid forming inverter. A maximum grid current value is determined based on a measured generator load and a limit function. A virtual impedance value and a virtual voltage drop over the virtual impedance value are determined. A virtual synchronous machine angle is determined based on a power reference and the virtual grid power. The voltage reference for controlling the line side inverter is determined based on the virtual synchronous machine angle, the virtual voltage drop and the voltage magnitude reference.
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公开(公告)号：US20240079978A1
公开(公告)日：2024-03-07
申请号：US18506631
申请日：2023-11-10
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Esmaeil EBRAHIMZADEHVESHAREH , Torsten LUND , John Godsk NIELSEN
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.
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Patent Agency Ranking
公开(公告)号：US20220085740A1
公开(公告)日：2022-03-17
申请号：US17419244
申请日：2019-12-16
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： John Godsk NIELSEN , Torsten LUND , Esmaeil EBRAHIMZADEHVESHAREH
Abstract: The invention relates to a method for controlling a wind turbine as virtual synchronous machine by determining the synchronous machine rotational speed rotational speed and the synchronous machine angle. The virtual synchronous machine rotational speed is determined based on a combination of a feedback of a damping power, a power reference for a desired power output of the wind turbine, a grid power supplied by the wind turbine to a power grid and a chopper power dissipated by the chopper and an inertial integration model, the synchronous machine angle is determined based on an integration of the synchronous machine rotational speed, and the damping power is determined based on the virtual synchronous machine rotational speed.
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公开(公告)号：US20180123470A1
公开(公告)日：2018-05-03
申请号：US15564847
申请日：2016-04-11
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： John Godsk NIELSEN , Søren ANDERSEN , Lars HELLE , Duy Duc DOAN
CPC classification number: H02M5/4585 , F03D9/255 , H02J3/386 , H02M7/493 , H02P27/00 , H02P27/04 , H02P29/02 , H02P29/032 , H02P2101/15 , H02P2201/03 , Y02E10/725 , Y02E10/76
Abstract: A method of controlling a full-scale converter system in which both the grid-side inverter unit and the generator-side inverter unit have a series-connection of parallel inverters and form a generator-side and grid-side voltage-center-point at a voltage level between the inverters connected in series. The voltage-center-points are electrically connected by a center-line conductor. Conversion operation with a de-rated maximum active power-output is performed in response to at least one of (i) the grid-side inverter and (ii) the generator-side inverter of the first converter-string being disabled, by disabling active power production of at least one of (i) the grid-side inverter and (ii) the generator-side inverter of the second converter-string, or correspondingly reducing active power production of the second converter-string, thereby preventing a compensation current along the center-line conductor.
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公开(公告)号：US20230178988A1
公开(公告)日：2023-06-08
申请号：US17923856
申请日：2021-05-06
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： Torsten LUND , Germán Claudio TARNOWSKI , John Godsk NIELSEN , Per Hagen NIELSEN
CPC classification number: H02J3/18 , H02J3/381 , H02J3/24 , H02J2300/28
Abstract: Aspects of the present invention relate to a method of voltage control for at least one wind turbine generator configured to absorb and supply reactive power on demand, the method comprises: receiving a dispatch signal from a power plant controller indicating a reactive power set point; determining a terminal voltage level of the at least one wind turbine generator; generating a reactive power correction value based on a deviation of the terminal voltage level from a voltage set point; adjusting the reactive power set point by the reactive power correction value; and controlling the at least one wind turbine generator according to the adjusted reactive power set point.
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公开(公告)号：US20220069580A1
公开(公告)日：2022-03-03
申请号：US17419251
申请日：2019-12-16
Applicant: VESTAS WIND SYSTEMS A/S
Inventor： John Godsk NIELSEN , Torsten LUND , Esmaeil EBRAHIMZADEHVESHAREH
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.
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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
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.
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