Impact of TCSC on the Protection of Transmission Lines

TLDR

The study analyzes how TCSC affects protection of transmission lines. The authors model TCSC as a dynamic device, analytically examine its transient response, and validate the findings with detailed RTDS simulations of the power system and protective relays, confirmed by a commercial relay. The results reveal that TCSC operation can compromise protection on its own line and also cause issues for adjacent lines.

Abstract

This paper presents a comprehensive analysis of the impact of TCSC on the protection of transmission lines. The TCSC is considered as a dynamical device and its transient process is modeled in order to have the response to disturbances based on its own control strategy. It is shown that not only the TCSC affects the protection of its line, but also the protection of adjacent lines would experience problems. The analysis is done first analytically by using simple models, then the power system and the protective relays are simulated in detail by Real Time Digital Simulator (RTDS). Finally, the simulation results are validated by using a commercial relay.