公开(公告)号：US10855082B2

公开(公告)日：2020-12-01

申请号：US16099608

申请日：2017-05-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian Biris ,  Gert Karmisholt Andersen ,  Uffe C. Merrild ,  Leif Svinth Christensen

IPC: H02J3/38 ,  F03D7/02 ,  F03D7/04 ,  H02P9/00 ,  F03D9/25 ,  H02J3/00

Abstract: Aspects of the present invention relate to a method for controlling an amount of power to be delivered from a wind turbine generator to a power grid during an abnormal power grid event, the method comprising the steps of detecting an abnormal power grid event; controlling an active current delivered to the power grid in response to a measured or determined total active current; and controlling a reactive current delivered to the power grid in response to a measured or determined total reactive current. Aspects of the present invention further relate to a computer program product for carrying out the method as well as a wind turbine generator being capable of carrying out embodiments of the invention.

公开(公告)号：US11233400B2

公开(公告)日：2022-01-25

申请号：US16062888

申请日：2017-05-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian Biris ,  Uffe C. Merrild ,  Leif Svinth Christensen ,  Gert Karmisholt Andersen

IPC: H02J3/18 ,  F03D7/02 ,  F03D9/25 ,  G05B15/02 ,  H02K7/18 ,  H02P9/00

Abstract: Aspects of the present invention relate to a method for controlling an amount of reactive current provided from a wind turbine generator to a power grid during an abnormal power grid event, said wind turbine generator comprising a doubly-fed induction generator having a rotor and a stator, and a power converter coupling the rotor to the power grid, the power converter comprising a grid-side inverter, wherein the method comprises the step of balancing the reactive current provided to the power grid between a reactive stator current and a reactive grid-side inverter current, wherein the reactive grid-side inverter current is controlled in accordance with a reactive current capacity of a grid breaker receiving the reactive current provided by the grid-side inverter. Aspects of the present invention also relate to a wind turbine generator being capable of performing the method.

公开(公告)号：US10704534B2

公开(公告)日：2020-07-07

申请号：US16143818

申请日：2018-09-27

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian Biris ,  Uffe C. Merrild ,  Leif Svinth Christensen ,  Martin Ansbjerg Kjær

IPC: F03D9/25 ,  H02J3/38 ,  H02J3/18 ,  F03D7/02

Abstract: Controlling a wind turbine during a grid fault where the grid voltage drops below a nominal grid voltage. After detection of a grid fault, the total current limit for the power converter output is increased to a total maximum overload current limit. Depending on whether active or reactive current generation is prioritized, an active or reactive current reference is determined. The active current reference is determined in a way so that a reduction in active power production due to the grid voltage drop is minimized and based on the condition that the vector-sum of the active output current and the reactive output current is limited according to the total maximum overload current limit, and a maximum period of time is determined in which the power converter can be controlled based on the active/reactive current references. Afterwards the power converter is controlled based on the active and reactive current references.

公开(公告)号：US10570885B2

公开(公告)日：2020-02-25

申请号：US16143818

申请日：2018-09-27

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Ciprian Biris ,  Uffe C. Merrild ,  Leif Svinth Christensen ,  Martin Ansbjerg Kjær

IPC: F03D9/25 ,  H02J3/38 ,  H02J3/18 ,  F03D7/02

Abstract: Controlling a wind turbine during a grid fault where the grid voltage drops below a nominal grid voltage. After detection of a grid fault, the total current limit for the power converter output is increased to a total maximum overload current limit. Depending on whether active or reactive current generation is prioritized, an active or reactive current reference is determined. The active current reference is determined in a way so that a reduction in active power production due to the grid voltage drop is minimized and based on the condition that the vector-sum of the active output current and the reactive output current is limited according to the total maximum overload current limit, and a maximum period of time is determined in which the power converter can be controlled based on the active/reactive current references. Afterwards the power converter is controlled based on the active and reactive current references.

公开(公告)号：US10199970B2

公开(公告)日：2019-02-05

申请号：US15563754

申请日：2016-03-08

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Gert Karmisholt Andersen ,  Leif Svinth Christensen ,  Ciprian Biris ,  Uffe C. Merrild

IPC: H02P9/00 ,  H02P9/04 ,  H02P9/10

Abstract: The present invention relates to a method for operating a doubly fed induction generator wind power facility during an OVRT event, said the wind turbine facility being adapted to inject active and/or reactive current into an associated grid, the method comprising the steps of determining the occurrence of an over voltage grid event, and maintaining a grid-side inverter of the doubly fed induction generator wind power facility fully operable during the over voltage ride though event so as to maintain a controllable active and/or reactive current capability during the over voltage grid event.