Efficient system parameter selection to prevent oscillatory voltage instability

In this paper the effects of a suitable controller designs of FACT devices on the stability of power system is illustrated. The analysis is based on bifurcation, small signal and time domain simulations. A new and suitable procedure for optimization of system loading and dynamic loading margin is proposed to improve voltage stability and to prevent oscillatory voltage instability by designing controllers. Effect of SVC and TCSC devices are considered and compare in detail. First of all, the stability of the test system without FACT devices is investigated. And Results shows the system presents a saddle-node bifurcation. Then, static and dynamic analyses are repeated for the system including SVC and TCSC devices located by optimal placement algorithm. multi-parameter bifurcation analysis is presented to study the effect of system parameters on the Hopf and saddle node bifurcations, and to achieve the best system controller parameters values, a proper optimization proposed that prevents oscillatory voltage instability in system.