公开(公告)号：US10601310B2

公开(公告)日：2020-03-24

申请号：US15529840

申请日：2015-11-11

申请人： VESTAS WIND SYSTEMS A/S

发明人： Søren Andersen ,  Duy Duc Doan ,  Gert Karmisholt Andersen ,  Thomas Drljevic-Nielsen

IPC分类号： H02M1/44 ,  F03D9/25 ,  H02M1/08 ,  H02M1/12 ,  H02M5/458 ,  H02M7/217 ,  H02M7/48

摘要： A power generation system, wind turbine, and method of pulse width modulation (PWM) for power converters are disclosed. The method generally includes generating a substantially random distribution of timing values, applying a filter to the random distribution to produce a modified random distribution, and delivering PWM timing signals based on the modified random distribution to the power converters.

公开(公告)号：US10544778B2

公开(公告)日：2020-01-28

申请号：US15573931

申请日：2016-06-16

申请人： VESTAS WIND SYSTEMS A/S

发明人： Yi Zhou ,  Gert Karmisholt Andersen ,  Manoj Gupta ,  Vajira Suminda Ganepola ,  Ciprian Biris ,  Miguel Angel Cova Acosta

IPC分类号： F03D7/02 ,  G01R23/02 ,  F03D9/25 ,  G05B13/02 ,  H02K7/18 ,  H02P9/00 ,  G01R19/25

摘要： A method is provided of protecting a wind turbine with a doubly-fed induction generator (DFIG) against a sub-synchronous resonance (SSR) event acting on the wind turbine. A plurality of power-output values or current-output values is measured over a given period of time that corresponds to a measurement cycle. It is determined whether power-output values or current-output-values measured in the at-least-one measurement cycle are indicative of an SSR-event critical for further operation of the wind turbine. The wind turbine is shut down if the measured power-output values or current-output values are indeed indicative of an SSR-event critical for operation of the wind turbine.

公开(公告)号：US10135354B2

公开(公告)日：2018-11-20

申请号：US15541217

申请日：2015-12-08

申请人： VESTAS WIND SYSTEMS A/S

发明人： Søren Andersen ,  Gert Karmisholt Andersen ,  Duy Duc Doan ,  John Godsk Nielsen

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

摘要： 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.