Control Strategies for Output Power Smoothening of DFIG with SVC in Wind Conversion System

Due to increasing penetration of wind power generation, new challenges are originating from the intermittent nature of wind. Some of the challenges are maintaining frequency stability and output power smoothening. These will necessitate the control of wind turbines in order to maintain the stability rather than extracting the maximum power. This paper proposes a new control scheme for the output power smoothening of wind turbine termed as rotor inertia control. The controller is controlled to emulate inertia of turbine by allowing the turbine speed to vary over a wide range, thus, utilizing the part of kinetic energy of the wind. By using this controller, output power is reduced by some amount by maximum power point, so a controlled switch is used, by which one can switch between Maximum Power Point Tracking (MPPT) controller and rotor inertia controller during healthy and abnormal conditions, respectively. Further Static VAR Compensator (SVC) is used to improve the voltage profile of the system. The proposed control scheme is validated using Matlab/Simulink under different conditions.