On-line voltage stability assessment in the presence of TCSC with economic consideration

In modern power system operation the optimization problem and voltage stability problem are two interrelated issues. This paper presents a new methodology to assess system voltage stability status combined with optimal power flow technique using instantaneous two-bus π-equivalent model of a power system at different operating conditions. Thyristor controlled series compensator (TCSC), one of the popularly used FACTS controllers has also been modelled and included in the analysis to simulate a power system in more practical way. The developed methodology has an essence of on-line application which has been illustrated here with a standard IEEE 57-bus power system.