Comparative Effect of Series and Shunt FACTS on the Steady State Improvement of Voltage Profile on Nigeria’s 330 kV Transmission System

Abstract

This paper investigates the comparative effects of static series synchronous compensator (SSSC) and static synchronous compensator (STATCOM) on Nigeria's 48-bus, 330 kV transmission system. The SSSC is connected in series with a transmission line, while the STATCOM is shunt-connected for reactive compensation. The study aims to determine which of the two FACTS devices provides greater improvement to the voltage profile of Nigeria's 48-bus, 330 kV transmission system. The network was modeled using the power system analytical tool (PSAT) and analyzed using MATLAB. Simulation results demonstrate significant improvement across all 48 buses when both SSSC and STATCOM devices are integrated into the network. Specifically, the placement of STATCOM led to a 1.5% increase in voltage profile at the highest bus (Bus 18), from 314.8 kV to 319.5 kV. Conversely, SSSC resulted in a 3.3% increase in bus voltage profile compared to the base case, and a 1.8% increase compared to STATCOM, with Bus 18 reaching 325.3 kV. These findings suggest that for voltage profile improvement in power network design, SSSC FACTS should be prioritized over the shunt counterpart due to its greater impact.