Static switch based solution for improvement of Neutral Sections in HSR systems

Abstract

Since some decades thyristor based static switches are used for distribution grid applications. These static switches work in Medium Voltage range between 7 kVAC to 52 kVAC and have proved excellent reliability. High Speed Rail (HSR) systems are supplied by 25 kVAC one phase. To consume balanced power for HV three phase transport grids Neutral Sections (NZ) are disposed to change the power phase-to-phase. To reduce the effect of NZs in the HSR system a static switch based solution has been designed. Electrical, thermal and mechanical design of the power electronics is presented. The control strategy is designed to assure the train supply during the NZ crossing. The static switch is validated through Medium Voltage laboratory test in real electrical application conditions.