Development and Implementation of a Prototype for Co-phase Traction Power Supply System

Poor power quality of single-phase electric railway systems with industrial three-phase power supply will result in extra line losses, under-voltage at the terminal of contact wire, and unbalanced current of utility grid, etc. To address all of the above problems, a co-phase power supply system is adopted and an active power compensator (APC) based on electronic power converter is proposed in this paper. APC has the ability of balancing the current of the transformer, compensating reactive power, and filtering harmonics of the load. The performance of the co-phase power supply system is validated by the experimental results of a prototype.