Abstract
Abstract - Near surface transit system has should be constructed as installation cost of light rail transit with elevated track. So, distance between two substations is longer than conventional system. The long feeding distance results in severe voltage drop. This paper proposes a PWM rectifier instead of diode rectifier. The PWM rectifier has some advantages. This is able to control output voltage constantly to reduce voltage drop and to use regeneration power without additional inverter. This paper analyse on improved voltage profile and cost of substation with PWM rectifier. The analysis of voltage profile use PSIM, and the installation cost of substation with PWM rectifier is compared to substation with diode rectifier.Key Words : D.C. traction supply system, PWM rectifier, Voltage drop†Corresponding Author : Korea Railroad Research Institute, Korea.E-mail:jrkim@krri.re.kr* Korea Railroad Research Institute, Korea.** RD Accepted : March 01, 2015
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