Voltage Stability Improvement by Optimal Allocation of STATCOM

Abstract

Need for reliability, precision and rapid response is growing everyday in the current deregulated structure of power system. Voltage instability is a threat to security and reliability of the electrical power network. Hence, Flexible AC Transmission System (FACTS) devices are used to restore and regulate voltage at weak buses. One of these devices, Static Synchronous Compensator (STATCOM) provides fast acting dynamic compensation in case of severe fault. In this paper, voltage stability improvement by minimization of voltage deviation of an IEEE-14 bus testing system is presented. For this purpose, Specific indices can be used to identify the system's weakest bus. Di?erent indices like Simpli?ed voltage stability index (SVSI), FVSI (Fast Voltage Stability Index) and L-Index are considered in this paper. PSCAD software has been used for simulation of the test system using STATCOM.