Improved Grid Voltage Control Strategy for Wind Farms with DFIGs Connected to Distribution Networks

Xueguang Zhang; Weiming Pan; Yicheng Liu; Dianguo Xu

Improved Grid Voltage Control Strategy for Wind Farms with DFIGs Connected to Distribution Networks

Vol. 12, No. 3, pp. 495-502, May 2012

10.6113/JPE.2012.12.3.495

Distribution networks

Doubly fed induction generator wind farm

Grid voltage control

Negative sequence voltage compensation

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Abstract

This paper presents an improved grid voltage control strategy for wind farms with doubly-fed induction generators (DFIGs) connected to distribution networks based on an analysis of the operation limits of DFIG systems. A modified reactive power limit calculation method in different operation states is proposed and a reactive power control strategy during grid voltage dips/rises is further discussed. A control strategy for compensating unbalanced grid voltage, based on DFIG systems, by injecting negative sequence current into the grid through the grid side converter (GSC) is proposed. In addition, the negative current limit of the GSC is discussed. The distribution principle of the negative sequence current among the different DFIG systems in a wind farm is also introduced. The validity of the proposed voltage control strategy is demonstrated by Matlab/Simulink simulations. It is shown that the stability of a wind farm and the power grid can be improved with the proposed strategy.

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Cite this article

[IEEE Style]

X. Zhang, W. Pan, Y. Liu, D. Xu, "Improved Grid Voltage Control Strategy for Wind Farms with DFIGs Connected to Distribution Networks," Journal of Power Electronics, vol. 12, no. 3, pp. 495-502, 2012. DOI: 10.6113/JPE.2012.12.3.495.

[ACM Style]

Xueguang Zhang, Weiming Pan, Yicheng Liu, and Dianguo Xu. 2012. Improved Grid Voltage Control Strategy for Wind Farms with DFIGs Connected to Distribution Networks. Journal of Power Electronics, 12, 3, (2012), 495-502. DOI: 10.6113/JPE.2012.12.3.495.