Flicker study on variable speed wind turbine with DFIG and it's mitigation with grid side converter of turbine

Grid connected wind turbine may produce flicker during continues operation. In this paper flicker emission of variable speed wind turbine with a doubly fed induction generators is investigated during continuous operation, and the dependence of flicker emission on mean wind speed, wind turbulence intensity, short circuit capacity ratio and grid impedance angle are analyzed. Flicker mitigation is realized by output reactive control of turbine that is down with grid side converter of DFIG. For current control of this converter, two methods are suggested. This methods are voltage control and var control. The ability of flicker mitigating and required reactive power and converter rating of this two methods are analyzed in this paper. The result of simulation shows the good performance of this method for flicker mitigating.