In power system stability plays a very important role and necessary to maintain the stability of system when different contingency applied. The Power system is very complex and interconnected this resulting into lower frequency oscillations due to variation in load which creates stability problems. Stability enhance by various controller and optimization technique. To eliminate the stability problems proposed PID structured TCSC controller used in SMIB system. Proposed work implements with MATLAB/ Simulink environment and the performance of the PID structured TCSC controller is compared for without and with GWO algorithm. Observations and results tested on different loading conditions as nominal, light and heavy loading. Different types of fault consider in different loading conditions and various types of graphs presented as speed deviation, power angle deviation etc. All contingencies tabulated and compare results without and with GWO algorithm. The system evaluation is done by time domain simulation using MATLAB/Simulink software. It is detected that the out of all algorithms GWO algorithm found more compatible for parameters reduces settling time and provide superior performance of the power system. Different simulation results are also obtained for various loading & fault conditions.