A coordinated control strategy considering the coherence of generators for wind farms

Due to the reactive power control capability of double-fed induction generator (DFIG), a coordinated control strategy based on coherence clustering is proposed for DFIG wind farms (WFs). According to the strategy, the difference and coherence of DFIGs are fully considered in the WF. Firstly, DFIGs are divided into different clusters according to coherence clustering method. Then different control strategies are adopted for different clusters. Followed that a WF stability coefficient index is proposed comprehensively considering the grid voltage stability and reactive power margin. Simulation results show that under the proposed coordinated control strategy, grid voltage can be effectively supported, and reactive power margin is relatively larger to meet further requirement of the grid.