Fault Ride-Through Enhancement of Wind Power Plant Using Series Variable Impedance

Recently, the total capacity of wind generation connected to power system has increased significantly. In this situation, a large amount of disconnection of wind power generation may give a serious influence in the grid. It necessitated the revision of grid code requirements in many countries.This paper proposes a new control method for a fixed-speed induction generator using series variable impedance composed of power converter and energy storage device. We compared the stabilizing effect of the proposed control system to the case of STATCOM from the viewpoint of rotating speed and device capacity (cost). According to this study, the proposed method can stabilize the plant by smaller output compared to STATCOM.