Variable speed control of series-connected DC wind turbines based on generalized dynamic model

DC wind farm with series-connected wind turbines is proved to be a promising solution to collect large-scale wind power, especially for offshore application. This paper proposes a novel variable speed control strategy of the DC wind turbine to reduce wind energy curtailment during the voltage limitation period. A generalized model is also presented to realize the DC wind turbine modelling with electromechanical transients and all control function. Based on PSCAD/EMTDC, dynamic simulation cases under varying wind conditions have been conducted with two series-connected wind turbines to evaluate the effectiveness of the proposed control strategy.