Analysis and Simulation of STATCOM based SSR controller on the First Zone operation of Digital Distance Relay with Remedy

Abstract

The adoption of compensation in series may cause to some problems in power system transmission lines like SSR (Subsynchronous Resonance). The damping of SSR is achieved by the injection of shunt current into the transmission line with static synchronous compensator (STATCOM) based on the information of Subsynchronous component (SSC) of current extracted from the study system. The use of STATCOM based SSR controller at centre of transmission line badly affects the operation of Distance relay. This research article addresses the prime issues that are concerns the problems of distance protection due to mid-point connected STATCOM based SSR controller in the transmission line.  A novel algorithm is proposed to solve the associate problems with distance protection using the synchrophasors measurement.  The power system is modelled as Bergeron model of transmission line using PSCAD software.  The obtained simulation results show that the proposed adaptive setting scheme is more reliable and robust in comparison with existing distance protection schemes.