Author(s)

M. Fracchia, M. Galaverna, P. Pozzobon & L. Puglisi

Abstract

All metrorail plants and a large number of railway plants in the world are fed by electrical supply substations equipped with AC/DC conversion units. The most common rectifier configuration for the application is the parallel 12-pulse, which features low harmonic distorsion of AC line current and DC voltage, together with acceptable structure complexity and cost. The rectifiers are normally equipped with diodes and voltage regulation is not performed. In this paper the authors review some converters configuration suitable for voltage regulation and compare them on the basis of their impact on the operation of the plant. Introduction In a metrorail or railway system DC voltage drop at each substation terminals (and consequent voltage drop alomg the traction line)

Keywords