Optimal Placement and Sizing of FACTS Devices in Meshed Network /

Abstract

Flexible AC transmission systems (FACTS) are solid-state technologies which are widely used nowadays for power system stability, to increase flow of active power, and to adjust overall voltage profile of power system. FACTS devices also find their applications in improving transmission lines congestions and to reduce power losses. As such, they have number of applications nowadays in the modern power system network. However, placing these devices in the network and defining their proper locations and ratings are very important because without proper siting and sizing they cannot be used to their optimum potential The research carried out for this thesis involve study into the effect of FACTS devices placement on transmission network and explore methods for optimal siting and sizing of these devices. Although there are number of FACTS devices present nowadays, in this research, static VAR compensator (SVC) and thyristors-controlled series compensator (TCSC) are used, and their optimal siting and sizing are done. The whole procedure of optimal siting and sizing can be mainly divided into two major steps. In first step buses and lines are shortlisted from the whole network using sensitivity indices. These lines and buses are potential locations for TCSC and SVC respectively. Then heuristic-based optimization technique called particles swarm optimization (PSO) is utilized to find rating of these devices. These methods of optimal location and sizing are applied to IEEE 14 and 30 bus system, subsequently the same method will be utilized to enhance power system stability, voltage profile and to decrease true losses and reactive power flow on Pakistani national grid as a future work.