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：US10186470B2

公开(公告)日：2019-01-22

申请号：US15607184

申请日：2017-05-26

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Tusitha Abeyasekera ,  Thomas Lundgren Andersen ,  Henrik B. Møller ,  Ove Styhm

IPC: H05K7/20 ,  H01L23/34 ,  H01L23/373 ,  H01L23/473 ,  H01L25/065 ,  H01L23/58 ,  H02B1/56 ,  H01L23/00 ,  H01L23/46 ,  H01L23/492

Abstract: A heat sink for cooling at least one power semiconductor module, and that includes a basin for containing a cooling liquid. The basin has a contact rim for receiving the base plate and that includes a surface that is sloped inwards to the basin.

公开(公告)号：US12018655B2

公开(公告)日：2024-06-25

申请号：US17633870

申请日：2020-08-06

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Tusitha Abeyasekera

IPC: F03D7/04 ,  F03D7/02

CPC classification number: F03D7/048 ,  F03D7/0284

Abstract: Embodiments herein describe operating wind turbines in an offshore park to provide auxiliary power to a local AC grid or to an onshore grid during a grid malfunction. In one embodiment, the offshore park is coupled via a HVDC link to an onshore grid. When the HVDC link is down, a substation in the park includes a backup generator for creating a weak grid for powering auxiliary systems in a pilot turbine. The wind turbines in the park can switch to an auxiliary control system help power the auxiliary systems in the substation and in other turbines. In another embodiment, the offshore park is AC coupled to an onshore grid using a transformer in the substation. The wind turbines can participate in a brown or black start following a grid fault by switching to operating using the auxiliary control system.

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：US12012933B2

公开(公告)日：2024-06-18

申请号：US18341956

申请日：2023-06-27

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Tusitha Abeyasekera ,  Per Hagen Nielsen

IPC: H02J3/38 ,  F03D7/02 ,  F03D7/04

CPC classification number: F03D7/0284 ,  F03D7/048 ,  H02J3/381 ,  H02J2203/10 ,  H02J2203/20 ,  H02J2300/28

Abstract: Operating a renewable energy power plant connected to a power network at a point of interconnection. The plant includes: one or more renewable energy generators connected to a collection point of the renewable energy power plant, and a connecting network connecting the collection point to the point of interconnection. One method includes: receiving one or more measurement signals indicative of measured power characteristics of the renewable energy power plant at the point of interconnection; determining a dynamic short circuit ratio (DSCR) at the point of interconnection based on the one or more measurement signals; determining an equivalent dynamic short circuit ratio (EDSCR) at the collection point based on the determined DSCR at the point of interconnection and one or more components of an impedance of the connecting network; and controlling the one or more renewable energy generators by determining and dispatching active power set points based on the determined EDSCR.

公开(公告)号：US10250042B2

公开(公告)日：2019-04-02

申请号：US15521910

申请日：2015-10-19

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Tusitha Abeyasekera ,  Duy Duc Doan ,  Lars Helle ,  Søren Andersen ,  John Godsk Nielsen

IPC: H02M5/45 ,  H02J3/38 ,  F03D7/04 ,  F03D9/25 ,  H02P101/15 ,  H02M1/00

Abstract: A wind turbine converter system with a rectifier and an inverter and a converter controller has at least first and second converter strings. The converter system is controlled by a master-converter controller and a slave-converter controller. The master-converter controller controls the first converter string and the slave-converter controller controls the second converter string. The master-converter controller receives commands from a superordinate wind turbine controller, provides the slave-converter controller with string-control commands on the basis of the superordinate control commands, and controls the conversion operation of the first converter string on the basis of the superordinate control command. The slave-converter controller receives the string-control commands from the master-converter controller and controls the conversion operation of the second converter string on the basis of the string-control commands received. The first and the second converter strings can be arranged in a bipolar configuration giving access to a neutral point. Fault detection can be performed based on current through the neutral. The system is capable of fault ride-through. Also, in case of failure of the master-converter controller, a redundant unit takes its place.