Analysis of doubly-fed wind power generator low voltage control strategy based on Crowbar protection

Aiming at the problems of the DC over-voltage and the dynamic reactive power compensation, which caused by the doubly-fed wind generator switch Crowbar circuit when the grid voltage dips, and basing on the feedback linearization theory, the nonlinear control strategy on grid-side converter is propos...

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Published inDianli Xitong Baohu yu Kongzhi Vol. 42; no. 14; pp. 67 - 71
Main Authors Li, Xiao-Cong, Huang, Wei, Huang, Cheng-Xi, Lu, Jian-Cheng, Zha, Zhong-Kui, Xi, Yun
Format Journal Article
LanguageChinese
Published 16.07.2014
Subjects
Compensation
Control systems
Direct current
Dynamical systems
Electric potential
Nonlinear dynamics
Reactive power
Strategy
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Summary:Aiming at the problems of the DC over-voltage and the dynamic reactive power compensation, which caused by the doubly-fed wind generator switch Crowbar circuit when the grid voltage dips, and basing on the feedback linearization theory, the nonlinear control strategy on grid-side converter is proposed. This paper adopts a coordinated control STATCOM to compensate the dynamic reactive power of the grid. Simulation result shows that, the grid-side nonlinear controller can well restrain the DC over-voltage during the grid voltage dip, and meet the requirements of system reactive power by introducing a STATCOM compensation device. The result also confirms the correctness of the control strategy, which improves the ability of low voltage ride through (LVRT) of the system.
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ISSN:1674-3415