Power quality issues &it’s mitigation technique in wind energy generation

Awareness of power quality is highly increased in a sensitive industry, where the standardization and performance is an important aspect. The connection of wind turbine to the grid affectpsilas the electric grid power supply quality. Therefore it is necessary to maintain the power quality norm at the interface of the grid from the disruptive effect caused by wind turbine such as voltage fluctuation, switching operation, voltage dips, and reactive power & harmonics distortion on the grid. These disruptive effected can be minimized by adopting suitable control technique. The paper proposed the control scheme for voltage source inverter (VSI) in a current control mode to inject the compensating current into the power system at point of common coupling. A hysteresis current controller has been implemented to generate the inverter switching signals using the reference from source voltage. This ensures that wind turbine system will inject current through inverter to maintain unity power factor. The wind turbine shall provide active and reactive power support to the load. Thus the power system will operate with stipulated power quality norm at point of common connection. The typical system is simulated in Matlab/Simulink for practical condition in power system and simulated results under varying operating condition are presented.