公开(公告)号：US10601310B2

公开(公告)日：2020-03-24

申请号：US15529840

申请日：2015-11-11

Applicant: VESTAS WIND SYSTEMS A/S

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

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

Abstract: 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：US10483865B2

公开(公告)日：2019-11-19

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 ,  H02J3/28 ,  H02J3/38 ,  H02M5/458 ,  H02M7/219 ,  H02M7/493 ,  H02H3/10 ,  H02H7/122 ,  H02M1/12 ,  H02M1/32 ,  H03H7/01 ,  F03D9/25 ,  H02M7/48 ,  H02M7/23 ,  H02M1/00 ,  G01R31/40

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 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.

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.

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

IPC: H02J3/34 ,  H02J3/36 ,  H02J3/38 ,  H02M5/42 ,  H02M1/32

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：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.