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公开(公告)号:US10298140B2
公开(公告)日:2019-05-21
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
IPC: H02M5/458 , H02P27/00 , H02P29/02 , H02M7/493 , H02P29/032 , F03D9/25 , H02J3/38 , H02P27/04 , H02P101/15
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:US10236687B2
公开(公告)日:2019-03-19
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
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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公开(公告)号:US10135354B2
公开(公告)日:2018-11-20
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 , F03D9/25 , H02M1/00 , H02P101/15
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.
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