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이병송(Byung-Song Lee),김길동(Gil-Dong Kim),변윤섭(Yeun-Sub Byun),한영재(Young-Jae Han),박현준(Hyun-June Park) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
A new current controlled PWM technique with NPC structure is proposed in this paper. A current controlled PWM technique with neutral- point-clamped pulse-width modulation inverter composed of main switching devices which operates as switch for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential is described. The proposed current controller has a first and second current band. The switching pattern will be made by the first current band. According to the second current band, the output state of the switching pattern is changed into positive and negative state. This inverter output contains less harmonic content and lower switching frequency than that of conventional current controlled PWM technique at the same current limit. Two inverters are compared analytically and the performance is investigated by the computer simulation.
이병송(Lee Byung-Song),배창한(Bae Chang-Han),변윤섭(Byun Yeun-Sub),한경희(Han Kyung-Hee) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper shows the analysis of the inductive power transfer system in conjunction with series resonant converter operating variable high frequency. Of particular interest is the sensitivity of the complete system to variations in operational frequency and parameters. In inductive power transfer system, electrical power is transferred from a primary winding in the form of a coil or track, to one or more isolated pick-up coils that may relative to the primary. The ability to transmit power without contact enables high reliability and easy maintenance that allows inductive power transfer system to be implemented in hostile environments. This technology has found application in many fields such as electric vehicles, PRT(Personal Rapid Transit) etc. The coupling between the primary and secondary is then presented to include the effects of parameter and operational frequency variation.
공극변화를 고려한 철도차량용 선형 유도전동기 특성 연구
이병송(Byung-Song Lee),이형우(Hyung-Woo Lee),박찬배(Chan-Bae Park),한경희(Kyung-Hee Han),권삼영(Sam-young Kwon),박현준(Hyun-june Park) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents a characteristics of linear induction motor considering airgap variation for railway transit in order to achieve high performance of the vehicle. The operating principle of a LIM(Linear induction motor) is identical to a rotary induction motor. Space-time variant magnetic fields are generated by the primary part across the airgap and induce the electro-motive force(EMF) in the secondary part, a conducting sheet. This EMF generates the eddy currents, which interact with the airgap flux and so produce the thrust force known as Loren"s force. Even though the operating principal is exactly same as a rotary motor, the linear motor has a finite length of the primary or secondary parts and it causes static and dynamic end-effect which is the discontinuous airgap flux phenomenon. This end-effect causes the deterioration of the system performance, especially in high-speed operation. Another problem is that construction tolerance restricts the minimum airgap in order to prevent a collision between the primary part and the secondary reaction plate. More over, as the airgap length is getting smaller, the attraction force between the primary part and secondary parts is getting larger dramatically and the attraction force would be another friction against propulsion. Therefore, it is necessary to figure out the characteristics of linear induction motor considering airgap variation in order to achieve high performance of the vehicle. The dynamic model of LIM taking into account end-effects is derived. Then the modified mechanical load equation considering the effect of the attraction and thrust force according to the airgap variation is analyzed. The simulation results are presented to show the effect of the LIM according to the airgap variation.
이병송(Lee Byung-Song),변윤섭(Byun Yeun-Sub),백광선(Baik Kwang-Sun) 한국철도학회 1999 철도저널 Vol.2 No.2
This paper presents the current-fed inverter of a TGV-K traction system with thyristor switches using phase control and commutation techniques. The current-fed inverters have two modes of operation which consist of forced commutation and natural commutation. In forced commutation mode, at speed of less than 120km/h, commutation is forced by means of the commutation capacitors and the thyristors. Above 120km/h, the thyristors operate in natural commutation mode, according to the voltages between phases of the motors. In this paper, the power conversion theory of the TGV-K traction system and the control principle of the converter and current-fed inverter are discussed.
이병송(Lee Byung-Song),정락교(Jeong Rag-Gyo),조홍식(Cho Hong-Shik),정상기(Chung Sang-Gi),김진선(Kim Jin-Sun) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper proposes an experimental study on the traction system of rubber tired AGT(Automated Guideway Transit). IGBT VVVF inverter is developed for 1C2M propulsion system of AGT, and it consists of inverter stack, gate control unit, control unit, and interface unit. The combination test was carried out to prove the performance of inverter, and test results show that the developed inverter is excellent.
이병송(Lee Byung-Song),박성혁(Park Sung-hyuk),변윤섭(Byun Yeun-Sub),김명룡(Kim Myung-Yong),이수길(Lee Soo-Gil),박현준(Park Hyun-Jun) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents the current-fed inverter of a TGV-K traction system with thyristor switches using phase control and commutation techniques. The current-fed inverters have two modes of operation which consist of forced commutation and natural commutation. In forced commutation mode, at speed of less than 120㎞/h, commutation is forced by means of the commutation capacitors and the thyristors. Above 120㎞/h, the thyristors operate in natural commutation mode, according to the voltages between phases of the motors. In this paper, the power conversion theory of the TGV-K traction system and the control principle of the converter and current-fed inverter are discussed.
공극변화를 고려한 철도차량용 선형 유도전동기 특성 연구
이병송(Byung-Song Lee) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents a characteristics of linear induction motor considering airgap variation for railway transit in order to achieve high performance of the vehicle. The operating principle of a LIM(Linear induction motor) is identical to a rotary induction motor. Space-time variant magnetic fields are generated by the primary part across the airgap and induce the electro-motive force(EMF) in the secondary part, a conducting sheet. This EMF generates the eddy currents, which interact with the airgap flux and so produce the thrust force known as Loren"s force. Even though the operating principal is exactly same as a rotary motor, the linear motor has a finite length of the primary or secondary parts and it causes static and dynamic end-effect which is the discontinuous airgap flux phenomenon. This end-effect causes the deterioration of the system performance, especially in high-speed operation. Another problem is that construction tolerance restricts the minimum airgap in order to prevent a collision between the primary part and the secondary reaction plate. More over, as the airgap length is getting smaller, the attraction force between the primary part and secondary parts is getting larger dramatically and the attraction force would be another friction against propulsion. Therefore, it is necessary to figure out the characteristics of linear induction motor considering airgap variation in order to achieve high performance of the vehicle. The dynamic model of LIM taking into account end-effects is derived. Then the modified mechanical load equation considering the effect of the attraction and thrust force according to the airgap variation is analyzed. The simulation results are presented to show the effect of the LIM according to the airgap variation.