No-Geon Jung

Response Characteristic Analysis using Modeling of Propulsion System for 8200 Electric Locomotive

Conventional power conversion unit that is a major part of the propulsion system has applied GTO thyristor as a switching semiconductor device of main circuit since introduction of the 8200 electric locomotive. But problem that quick maintenance is difficult and its cost is increasing occurs because major components of the power conversion unit are slowly discontinued. To solve these, in this paper, it was analyzed the response characteristic of the propulsion system modeling of the 8200 electric locomotive using IGBT which is applied recently to ensure propulsion control technology. As results of response for a Propulsion system modeling, it show that a power conversion unit is controlled by PLL(Phase-locked loop) and SVPWM(Space Voltage PWM) respectively.

A Study on Powering Characteristic on Speed Variation of Propulsion System of Prototype 8200 Electric Locomotive

This paper study on powering characteristic on speed variation of propulsion system of prototype 8200 electric locomotive propulsion system through simulation modeling. For this purpose, it being applied in the field of railway IGBT (Insulated Gate Bipolar Transistor) elements are used. Converter was performed PLL (Phase-Locked Loop) control method that is used to control the phase and output voltage, and the inverter was carried an indirect vector control method to control the speed of traction motor. The results of simulation by modeling and experimental unit, we was confirmed that converter is controlled a unity power factor and output voltage by reference voltage. Also traction motor was controlled by indirect vector control and SVPWM inverter switching method very well.

The Analysis of Short Current on Actual System through Power Analysis of AT Feeder System for Electric Railway

Abstract – In this paper, we perform a modeling for the AT Feeder system in AC electric railway and we utilize the power EMTDC program to implement about AT feeder system modeling. In addition, we study the impedance characteristics of the AT feeder system and calculated fault current and impedance according to the distance due to fault accident.Based on it’s result, fault current are compared between calculating the value and simulation value in EMTDC modeling. Impedance of power system is Largest at the middle point of the system and is smallest near autotransformer, and then showed that the fault current is inversely proportional to impedance characteristics.Key Words : AT power system, EMTDC program, Fault current, Autotransformer, Impedance characteristic* Masters Course, Dept. of Transportation System Engineering, Korea National University of Transportation, Korea** Korea Railroad Research Institute, Korea*** Dept. of Defence Science and Technology, Hoseo University, Korea† Corresponding Author : Dept. of Transportation System Engineering, Graduate School of Transportation, Korea National University of Transportation, Professor/Ph.D, KoreaE-mail: goldmoon@ut.ac.krReceived : October 13, 2014; Accepted : October 20, 2014

Converter Control for APU of 8200 Series Electric Locomotive using Advanced Single Phase PLL Control Method

The APF (All Pass Filter) method that utilizes the computational power of the controller is most commonly used. However, since the calculation of the filter coefficient is complicated, the calculation is carried out in advance. It is difficult to apply it to the frequency fluctuation environment because the coefficient value is fixed. In this paper, a new control method of single phase PLL that can be usefully used in PWM converter device for electric railway was explained. Comparison and examination of similarities and differences between the conventional APF method PLL controller method and the newly proposed modified MA filter method PLL technique were performed. The possibility of implementation of the modified MA filter method through computer simulation was analyzed. In conclusion, the method proposed as the conclusion was applied to the APU(Auxiliary Power System) of 8200 Series Electric Locomotive and its usefulness was confirmed.

The Feasibility Study on Small-scale Prototype Electric Railway Vehicle Application using Fuel Cell Generation System

Fuel cell power system, unlike conventional energy sources, converts chemical energy into electrical energy through electrochemical reaction of hydrogen and oxygen. In recent years, railway field as well as mobile fuel cell power system is being studying actively with development of hydrogen storage technologies. This paper presents the feasibility study on small-scale prototype electric railway vehicle application using fuel cell generation system. it is confirmed that proposed fuelcell-battery hybrid system shows good response characteristic about speed and torque based on design of parameter on system. Also as results of response for proposed system modeling, it show that powering mode and braking mode of system is controlled by switching devices of converters.

A study on the life cycle cost analysis of PWM modules in auxiliary power system

The maintenance cost of 8200 series electric locomotive operating in Korea is rising due to aging and lack of original technology. 8200 series electric locomotive have two auxiliary power systems. The auxiliary power system supplies power to the passenger cars. So it is related to the safety and reliability. There are many parts of the auxiliary power system. Among that, The PWM modules are very important in 8200 series electric locomotive. This is because the PWM modules is a power conversion device that is essential for powering the passenger cars. Also, the price of PWM modules is very high. So maintenance cost of PWM modules has increased. In this paper, Life Cycle Cost analysis was conducted for PWM modules of the auxiliary power system in 8200 series electric locomotive. To analyze LCC, cost of breakdown maintenance and operating is needed to apply.

A study on the LCC analysis of GTO in the main conversion system in 8200 series electric locomotive

The GTOs are important device in Korean 8200 series electric locomotive because GTOs which are switches of converter and inverter in main conversion power system frequently fail. Also the price of GTOs are very high. So maintenance cost of GTOs has increasing. In this paper, LCC analysis was conducted for GTOs of the main conversion system in 8200 series electric locomotive. In order to LCC analysis, cost of breakdown maintenance and operating was applied.

Arc characteristic analysis of railway vehicle according to excitation frequency using simulator of contact loss

Rigid bar and pantographs are used to power electric railway vehicles. When operating an electric railway vehicle, Rigid bar and pantographs are unstable in contact and occurs Arc. It is the cause of breakdown and accident. In this paper, a contact loss simulator for a rigid bar system was designed and the characteristic of arc is analyzed. Especially, occurrence of arc due to the excitation frequency is analyzed because the excitation frequency is generated by impact between current collector of the railway vehicle and R-bar.

Analysis of failure code of auxiliary power system SIBCOS in 8200 series electric locomotive using signal analyzer

In this study, the fault code of SIBCOS in 8200 series locomotive auxiliary power system was analyzed for the development of the product considering the compatibility with an electric locomotive operated. In addition, the failure code that was frequently displayed when applied to real vehicles was analyzed.

Contact Loss Simulator to Analyze the Contact Loss of a Rigid Catenary System

In this paper, a contact loss simulator for a rigid catenary system was designed and used to analyze the effect on the power source according to the conditions of the rigid catenary system and pantograph. R-bar applied to a high-speed train among the real rigid catenary system was used in the contact loss simulator for rigid catenary systems. The excitation frequency generated with the movement of the railway vehicle was simulated. The characteristics according to the frequency and amplitude of the excitation frequency and the presence or absence of pantograph movement were analyzed. This work is considered to be helpful in analyzing the characteristics of contact loss in the interface between a real rigid catenary system and a rail vehicle.