公开(公告)号：EP3462559A1

公开(公告)日：2019-04-03

申请号：EP18196816.5

申请日：2018-09-26

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： BIRIS, Ciprian ,  MERRILD, Uffe C. ,  CHRISTENSEN, Leif Svinth ,  KJÆR, Martin Ansbjerg

IPC: H02J3/18 ,  H02J3/38 ,  F03D7/02 ,  H02J3/00

Abstract: The invention relates to a fault ride through method for 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. This may allow generation of an increased active current for compensating a reduction in active power. Depending on whether active or reactive current generation is prioritized, an active or reactive current reference is determined initially. 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 Iq and the reactive output current Id 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 and reactive current references. Afterwards the power converter is controlled based on the active and reactive current references.

公开(公告)号：EP3314741A1

公开(公告)日：2018-05-02

申请号：EP16732442.5

申请日：2016-06-09

Applicant: Vestas Wind Systems A/S

Inventor： ANDERSEN, Gert Karmisholt ,  BIRIS, Ciprian ,  ZHOU, Yi ,  GUPTA, Manoj ,  GANEPOLA, Vajira Suminda ,  MERRILD, Uffe C.

IPC: H02P9/10 ,  H02P9/00

CPC classification number: H02P9/007 ,  H02P9/006 ,  H02P9/102

Abstract: A method is provided of controlling a doubly fed induction generator—(DFIG) wind turbine converter system if a sub-synchronous resonance event acts on the wind turbine. According to the method a sub-synchronous resonance event is detected. Thereupon, a switch from a non-SSR-current/voltage control mode to a SSR-control mode is performed. At least one of the following activities is performed in the SSR-control mode, namely: (i) freezing rotor AC voltages in magnitude and phase, (ii) altering at least one rotor-current-controller gain (iii) altering at least one rotor-current-controller time constant, to dampen the effect of the SSR-event on the wind turbine.