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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.
다단자망 알고리즘을 이용한 급전시스템의 무효전력 보상 모델링 및 시뮬레이션
김주락(Joorak Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.5
The power supply system in Korean electrified railway has adopted AT feeding. If a fault occurs in some substation for any reason, the vicinity substation must feed electric power on the outage substation through catenary. So, the feeding distance grows twice of the normal state at extended feeding condition. If substation’s feeding distance is longer than normal condition, the catenary impedance and train to supply electric power from the substation. Therefore, the severe voltage drop can occur and power supply shall be not allowed. This paper presents the model of compensator against voltage drop using multi-port network algorithm. Whole traction power supply system can be analyzed with this model. Computer simulation including this model is performed based on real train schedule and increased schedule in case studies.
연료전지 구동차량을 이용한 전차선로 전압강하 보상방안 연구
김주락(Joorak Kim),창상훈(Sang-Hoon Chang) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11
전세계적인 녹색성장의 기조에 따라 철도분야에서도 신재생 에너지의 활용 등 다양한 방식으로 그 적용성이 연구되고 있다. 본 연구에서는 연료전지(Fuel Cell)을 에너지원으로 하여 구동되는 철도차량을 이용하여 급전시스템의 전압강하를 보상하는 방법에 관한 것이다. 연료전지 구동 차량은 연료전지, 연료전지의 출력을 제어하는 PCS 및 견인전동기로 구성되어 있어 PCS의 제어 방법에 따라 연료전지의 출력을 전차선로로 내보내어 전압강하 보상에 활용할 수 있을 것이다. 연료전지 차량의 이동성에 기반한 자유로운 전압강하 보상위치와 PCS 제어에 따른 출력변화 등에 기초하여 전차선로의 전압강하 보상에 이용하는 것이다. 본 논문에서는 연료전지 차량의 보상용량 및 보상위치에 따른 전압강하 보상 효과에 대하여 검토한다. Fuel cell vehicle is composed of a traction motor and PCS for controlling its output. If PCS can be controlled for connecting fuel cell vehicle to catenary(traction power supply system), the compensation of power quality by fuel cell vehicle is available. Specially, fuel cell vehicle can be everywhere in rail. So, the desired compensation is available the desired location. This paper presents the compensation against voltage drop in railway system using fuel cell vehicle.
경부고속선의 전력공급 안정성 검토를 위한 연장급전 조건의 전압강하 검토 (I)
김주락(Joorak Kim),이장무(Changmu Lee),장동욱(Dong-Uk Jang) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
This paper presents the simulation of traction power supply system for the evaluation of voltage drop in Kyungbu high speed line. This simulation is performed in circumstance of extended feeding through vicinity substation. Extended feeding should be considered from design of system. Therefore voltage drop at extended feeding must be accepted against regulation. In this paper voltage drop is evaluated under condition of extended feeding targeting section from Shinchungju and Pyungtaek S/S.