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PWM컨버터를 적용한 경전철 전력공급시스템에 관한 연구
김주락,박창릉,박기준,김주욱,Kim, Joorak,Park, Chang-Reung,Park, Kijun,Kim, Joo-Uk 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.4
Currently, power conversion system which converts AC to DC Power is applied in domestic urban railway. The diode rectifier is used in most of them. However the diode rectifier can not control the output voltage and can not regenerate power as well. On the other hand, PWM (pulse width modulation) converter using IGBT (isolated gate bipolar transistor) can control output voltage, allowing it to reduce the output voltage drop. Moreover the Bi-directional conduction regenerates power which does not require additional device for power regeneration control. This paper compared the simulation results for the DC power supply system on both the diode rectifier and the PWM converter. Under the same load condition, simulation circuit for each power supply system was constructed with the PSIM (performance simulation and modeling tool) software. The load condition was set according to the resistance value of the currently operating impedance of light rail line, and the line impedance was set according to the distance of each substations. The train was set using a passive resistor. PI (proportional integral) controller was applied to regulate the output voltage. PSIM simulation was conducted to verify that the PWM Converter was more efficient than the diode rectifier in DC Traction power supply system.
PWM 정류기를 적용한 직류급전시스템의 전압강하 및 비용 평가
김주락(Joorak Kim),박기준(Kijun Park),박창릉(Chang-Reung Park),추은상(Eun-Sang Choo),이준영(Jun-Young Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.4
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.