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이을재,박선순,김영석(Eul-Jae Lee),Sun-Soon Park,Young-Seok Kim 전력전자학회 1996 전력전자학술대회 논문집 Vol.1996 No.-
The carborne Automatic Train Control(ATC) system keeps automatically optimum tram speed against over speed by detecting the speed code signals from wayside(track) circuit equipment If there is no response for braking against the over speed detected, the driver will be noticed Instantly by visual and audible warning signals And then the ATC processes into braking mode for safe train operations to prevent any hazards by over speed limit In this paper we are introduced the novel ATC system which has triple constructed structure made by 32 bit floating point DSP(ADSP21020-20) and process dealed with frequency domain and time domain for detecting signals Owing to these reason It IS no needed several band pass filters used In conventional ATC systems to detect the speed limit frequency Also system's reliability and tolerance are Incremented by adopt to 2 out of 3 logic to the outputs decision.
이을재(Lee Eul-Jae),이은규(Lee Eun-Gyu),윤차중(Yoon Cha-Jung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
This paper presents a PFC(Power Factor Correction) system to control the power factor of input current of the converter system which is working in the propulsion system of KTX high speed train. In the KTX train system, initially introduced from ALSTOM, the thyristor converter with phase controlling technique is adopted in the current fed type powering system. The input current induces harmonic losses highly because the waveform becomes rectangular shapes according to the filter inductor current increased as the train speed increasing gradually. Especially the interference with the signalling systems is severe concerned due to high current harmonics on the catenary line. To protect this problem, a frequency trap filter(notch filter) is operating with the input converter system. In this paper, an analysis work and PC simulation have been done on the PFC system to upgrade its performance and maintenance efficiency.
이을재(Lee Eul-Jae),이병호(Rhee Byoung-Ho),윤차중(Yoon Cha-Jung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
This paper presents a new design for an excitation chopper system which is used in the propulsion system of KTX high speed train. Two synchronous motors, two current fed C/I(converter/inverter) systems and an excitation chopper are consisted in a main propulsion system. In the traditional excitation chopper control system, GTO thyristor has adopted as a main power device. Thus the output motor torque can have pulsation in the weak field current control region due to that the switching frequency becomes lower frequency caused by the minimum pulse width constraint. In this paper, an improved IGBT excitation chopper system proposed and analyzed by PC simulation to clarify its availability.
8200호대 전기기관차 객차전원공급장치(HEP)의 출력전압품질향상을 위한 최적화된 PWM 방법
이을재(Eul-Jae Lee),이진국(Jin-Kook Lee),윤차중(Cha-Joong Youn),김재문(Jae-Moon Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.11
HEP(Head Electric Power) system, supplying 3-phase service power to the coach vehicles, is a kind of special auxiliary power equipment which is boarded on 8200 series electric locomotives in KORAIL. This equipment shares high voltage DC link with a main propulsion converter/inverter systems. It was difficult to use high frequency PWM technique so that GTO has been used as a power device same like the main power system. Due to low PWM frequency(300㎐) of HEP inverter, the output voltage has less power quality comparing to normal SIV(Static Inverter) system. In this paper, an optimal PWM strategy is presented for new IGBT type HEP inverter system. Several PWM techniques were investigated to improve output voltage quality under fixed lower filter inductance and not high PWM frequency. Finally PC simulations have been done to clarify its availability.