An active railway power quality compensator for 2×25kV high-speed railway lines

The AC 2×25 kV power supply system is a widespread solution in high-speed railway networks. Owing to the operation of high-power trains in these systems, the 4Q converter generates a high amount and wide spectrum of harmonic currents, which may interface with the signaling systems, communication devices and utility power systems. In this paper, a new Active Railway Power Quality Compensator (ARPQC) based on two-phase, three-wire converter is proposed to suppress harmonics and improve the displacement factor of the system. In order to have an accurate analysis, a suitable model of 4Q converter and eight-conductor based Overhead Catenary System (OCS) together with autotransformers have been developed. The precise simulation results have been provided to verify the effectiveness of the proposed compensator.