Impact of SVC and DG Coordination on Voltage Constrained Available Transfer Capability (VSATC)

Abstract

Rapidly increasing power demand and inadequate generation and transmission capacity have set the trends towards Distributed Generation (DG) and Flexible AC Transmission System (FACTS) aimed at sustainable power delivery. FACTS and DG are often deployed to relieve congestions, improve voltage stability, and enhance transmission capability. However, FACTS and DG placement are often achieved separately. Hence their coordination in power systems operation is paramount for improved power transfer and minimal power losses for optimal power delivery. This paper demonstrates the coordination of SVC and DG in the IEEE 14 bus network for the enhancement of Voltage Constrained Available Transfer Capability (VSATC) and power loss reduction using Multi­Objective Particle Swarm Optimization (MOPSO). Since the objectives are opposite and parallel, hence the need for the transformation of ATC to minimization, which was achieved by negating its value during dominance determination stage. Voltage constrained ATC is obtained using continuation power flow (CPF) and computed at the CPF nose curve. Result show improved ATC with increasing DG penetration level. At high DG penetration (80%), ATC improved by 6.6% while losses reduced by 18.4% when compared to SVC and DG without coordination. Also, the Pareto front of ATC versus power loss indicates parabolic like characteristics.