Control Strategy of Wind Turbines for Their Withdrawl of Frequency Regulation

The simultaneous withdrawal of multiple WTGs after wind farm participation in frequency regulation will cause a large power plunge, which in turn will cause a serious secondary frequency drop in the system. Moreover, due to the large area of large-scale wind farms, the wind conditions in which each WTG is located vary greatly, and the volatility of wind speed is more complicated, so the timing arrangement of WTG withdrawal becomes more difficult. Aiming at this problem, this research takes the power dips and the output frequency regulation energy into account, at the moment of withdraw of WTG, establishes a wind speed differentiated withdraw control mode for WTG frequency regulation, and based on this, a novel control strategy of wind turbines for their withdraw of frequency regulation is proposed, which staggers the time of speed restoration of the WTG groups at the wind farm level to mitigate the power dips caused by the simultaneous withdraw of multiple WTGs.