Location of static var compensator in a multi-bus power system using unique network equivalent

This paper presents a new approach to identify the suitable location for static var compensator in a multi-bus power system for voltage stability enhancement using a unique two-bus u-network equivalent derived with optimal power flow solution of the actual system at different operating conditions. An index named equivalent network based index (ENBI), derived from the parameters of two-bus equivalent of the multi-bus power system is used for positioning the static var compensator. The proposed approach has been tested under simulated condition on a practical power system (203-bus Indian Eastern Grid) for illustration purpose. Simulation results obtained with the proposed approach are compared with the results of well-established L-index method. Improvement in voltage stability margin using static var compensator is also investigated for the test system considered.