A modified particle swarm optimization (MPSO) algorithm is utilized in this paper to find out the optimum design of Proportional-Integral-Derivative (PID) controller parameters that improves the stability of a Single-Machine Infinite-Bus (SMIB) system with Static VAR Compensator (SVC). The performance of the power system under different loading conditions is investigated by using three tuning methods. Namely, Ziegler-Nichols-PID, PSO-PID, and MPSO-PID.The simulation results show that the proposed MPSO-PID controlling technique has improved the system response as compared to the two other techniques, that because it gives minimum rise time and minimum settling time with no overshoot and approximately zero steady-state error. All simulations are carried out in MATLAB R2010a software environment.

This paper presents series and compound compensators that will be added to the power system in order to enhance the voltage stability during the increasing in power demand. In order to get the optimal location, size and the minimum power loss of these compensators a comparative study is made between the two types based on normal PSO and weighted PSO optimization methods. The proposed algorithm is applied on IEEE 30-bus test system and the simulations have been made in MATLAB R2013a software environment. The results show that the system performance is better with WPSO than PSO.