Layered VAR control strategy of DFIG-based wind farm

This paper proposed a novel layered VAR control strategy to solve VAR and voltage stability caused by wind farm integration. The strategy first calculated reactive power demand of the wind farm by deviation of reference voltage and measured voltage of control point. Then the calculated reactive power demand was distributed by equal power factor algorithm to single wind generator in the wind farm. In this way voltage stability of grid integrated with wind farm can be solved. Wind farm reactive power limit and power factor limit were considered real-time in wind farm reactive power demand calculation. Simulation shows the strategy can support voltage of control point and restrain voltage fluctuation caused by load change.