Stabilization of a Wind Farm Using Static VAR Compensators (SVC) Based Fuzzy Logic Controller

Wind energy is a cost competitive and environmentally clean renewable energy sources. Wind farm capacity connected to power system increasing rapidly worldwide. During transient conditions wind farm drive a large reactive power which in turn causes voltage instability. In this paper, Static VAR Compensator (SVC) based fuzzy logic controllers (FLC) has been implemented to improve transient stability and damping power oscillations of a wind farm connected to power system. Different fault types and different fault durations were considered for the study to investigate the effect of the SVC based FLC on system stability. The suggested fault types are, single line to ground fault, double line fault, and three line to ground faults. The different duration faults are 50ms, 80ms and 100ms. Different locations are considered for the SVC at the studied system. The proposed controller provides the wind farm system with damping effect during transient condition and provides much smoother and quicker response in the post-fault conditions. The proportional plus integral (PI) controller is used for the comparative study. The studied system consists of wind farm represented by double fed induction generator (DFIG) connected to utility grid.