Controlled shunt reactor – A necessity in HVAC transmission systems

Fixed shunt reactors are traditionally used in long distance Extra High Voltage (EHV) and Ultra High Voltage (UHV) lines to reduce Ferranti over-voltages and over-voltages that arise due to load rejection. A new equipment, called Controlled Shunt Reactor (CSR), has been developed [3], [4]. Detailed load flow and voltage stability analysis on a typical 400 kV interconnected network proves that replacement of fixed shunt reactors with CSR is beneficial. This study report is an attempt to justify and quantify the economic and technical benefit of CSR in a 400kV system.