Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Critical Short Circuit Ratio Analysis on DFIG Wind Farm with Vector Power Control and Synchronized Control

  • Hong, Min (College of Electrical Engieering, Zhejiang University) ;
  • Xin, Huanhai (College of Electrical Engieering, Zhejiang University) ;
  • Liu, Weidong (Economic Research Institute of Stage Grid Zhejiang Electric Power Company) ;
  • Xu, Qian (Economic Research Institute of Stage Grid Zhejiang Electric Power Company) ;
  • Zheng, Taiying (College of Electrical Engineering, Zhejiang University) ;
  • Gan, Deqiang (College of Electrical Engieering, Zhejiang University)
  • Received : 2015.01.08
  • Accepted : 2015.11.04
  • Published : 2016.03.01
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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.

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