Verification of TCSC Control Strategies Impact on Subsynchronous Oscillations

Abstract

This paper presents a detailed analysis of the impact of different TCSC control methodologies on subsynchronous oscillations problem of a series capacitive compensated transmission system. The study system was modified from the First IEEE SSR benchmark model by changing a part of the fixed series capacitor to TCSC. At first the SSR analysis of the system is simulated without TCSC. Then simulation is done with TCSC model. Three different methodologies are checked, namely: constant current, constant firing angle and constant impedance. The control models and their principles are also described. Then the system is evaluated for several different compensation levels. The SSR analysis is verified through eigenvalues analysis using simulation studies.