Continuation Power Flow Method with Improved Voltage Stability Analysis in Two Area Power System

Abstract

Power systems operation becomes more important as the load demand increases all over the world. This rapid increase in load demand forces power systems to operate near critical limits due to economic and environmental constraints. The objective in power systems operation is to serve energy with acceptable voltage and frequency to consumers at minimum cost. This paper studies the important power system phenomenon and voltage stability by using continuation power flow method. Voltage collapse scenario is presented which can be a serious result of voltage instability and also the parameters that affected by voltage collapse are discussed. In analysing power system voltage stability, continuation power flow method is utilized which consists of successive load flows. Case studies are carried on 11 bus network in two areas and PV curves for several buses are obtained. Simulation is done with PSAT in MATLAB. Continuation Power Flow is was implemented using Newton Raphson method. In this paper the effect of compensator, placement of generator and variation of line reactance on the voltage stability have been studied and Comparison between performance of installation shunt capacitor, adding generator and variation of line reactance for improve voltage stability has been done. Simulation results show the proper performance of installation shunt capacitor, adding generator and variation of line reactance to improve voltage control and significantly increase the load ability margin of power systems.