Abstract
To deal with upcoming large-scale wind power integration into electrical grid, wind farms have to provide voltage support. In this paper, three different voltage control strategies are theoretically analyzed and their strengths and shortcomings are highlighted. Based on the derived transfer functions of the system respect to three voltage control strategies, the system dynamic performances in terms of disturbance rejection and robustness to variation of short circuit ratio are evaluated. Furthermore, the effects of communication delay on setpoint tracking and disturbance rejection are investigated. Moreover, the reactive current dispatch performance of the control strategies in steady state is investigated. The analysis results are validated by simulation and experiment. Finally, the control methods are quantitatively rated and conclusions are drawn.
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