This paper studies the effect of static var compensator (SVC) on stability of the wind energy conversion system (WECS) based on fixed speed induction generators (FSIG). Due to the nature of asynchronous operation, system instability of wind farms based on FSIG is largely caused by the excessive reactive power absorption by FSIG after fault due to the large rotor slip gained during fault. It was found that the SVC considerably improves the system stability during and after disturbances, especially when the network is weak. Moreover, this paper shows by using Harmony Search Algorithm (HS) and Self-Adaptive Global Harmony Search Algorithm (SGHS) instead of a Conventional Control Method for tuning the parameters of PI controller for SVC, the performance of the system with SVC is improved under different fault scenarios. MATLAB/Simulink based simulation is utilized to demonstrate the application of SVC in wind farm integration. it is also carried out to investigate the enhancement in performance of the WECS achieved with a PI Controller tuned by Harmony Search Algorithm as compared to a Conventional Control Method.