Symmetrization Method of AC Traction Substation with Power Balancer

Abstract

The paper describes the symmetrization method of power converter used in topology of AC traction substation with power balancer. This topology provides the three-phase current symmetrization and the reactive power compensation for AC traction substation feeding 25 kV / 50 Hz traction catenary. The described symmetrization method is based on principles of the Steinmetz symmetrizing circuit. The main paper contribution is a derivation and description of the symmetrization equations, which are used for the control algorithm of multilevel semiconductor converters in a delta connected circuit.