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Critical Short Circuit Ratio Analysis on DFIG Wind Farm with Vector Power Control and Synchronized Control
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 Title & Authors
Critical Short Circuit Ratio Analysis on DFIG Wind Farm with Vector Power Control and Synchronized Control
Hong, Min; Xin, Huanhai; Liu, Weidong; Xu, Qian; Zheng, Taiying; Gan, Deqiang;
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 Abstract
The introduction of renewable energy sources into the AC grid can change and weaken the strength of the grid, which will in turn affect the stability and robustness of the doubly-fed induction generator (DFIG) wind farm. When integrated with weak grids, the DFIG wind turbine with vector power control often suffers from poor performance and robustness, while the DFIG wind turbine with synchronized control provides better stability. This paper investigates the critical short circuit ratios of DFIG wind turbine with vector power control and synchronized control, to analyze the stability boundary of the DFIG wind turbine. Frequency domain methods based on sensitivity and complementary sensitivity of transfer matrix are used to investigate the stability boundary conditions. The critical capacity of DFIG wind farm with conventional vector power control at a certain point of common coupling (PCC) is obtained and is further increased by employing synchronized control properly. The stability boundary is validated by electromagnetic transient simulation of an offshore wind farm connected to a real regional grid.
 Keywords
Weak grid;DFIG wind farm;Vector power control;Synchronized control;Stability boundar1y;Critical short circuit ratio;Sensitivity;
 Language
English
 Cited by
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