전기철도 전력공급방식 변경(DC→AC) 방안

이해원(Hae-Won Lee),이인희(In-Hee Lee),박종원(Jong-Weon Park),최장영(Jang-Yong Choi) 한국철도학회 2019 한국철도학회 학술발표대회논문집 Vol.2019 No.5

전기철도 전력공급방식은 직류식과 교류식이 있다. 직류방식은 통신 유도장해가 없으며, 지하구간 터널 공사비가 절감된다. 교류방식은 간선철도구간에서 대용량, 고속화에 유리하다. 지하철에만 직류방식을 적용한 우리나라와 달리 유럽등 많은 국가에서는 간선철도에도 직류방식을 많이 채택하고 있다. 최근 일부 국가에서는 철도 속도향상 및 대용량 수송을 위해 직류방식을 교류방식으로 변경하고 있다. 우리나라에서는 서울지하철 1호선과 4호선의 교류-직류 연계구간 직통운전의 효율성 향상을 위해 직류구간을 교류방식으로 변경을 검토한 사례도 있었다. 본 논문에서는 국내외의 전기방식변경 및 검토 사례를 알아보고 향후 남북철도 직결운행을 위한 북한철도 현대화에 참고 할 수 있는 전력공급방식 변경 기본 절차를 정립해 보는데 의의가 있을 것이다. There are direct current(DC) method and alternating current(AC) method electric railway power supply system. The DC method has no communication induction disturbance, and the construction cost of the underground section tunnel is reduced, and the AC method is advantageous for the large capacity and high speed in the section of the main railway. Unlike Korea, which uses the DC method only in the subway, many countries including Europe have adopted the DC method in the main railway. Recently, some countries are changing the DC method to the AC method in order to improve railway speed and mass transport. In Korea, in order to improve the efficiency of direct operation of AC-DC connection section of Seoul Subway Line 1 and 4, there have been cases where the DC section was changed to AC type. In this paper, it will be meaningful to examine the changes and review cases of railway electric method at home and abroad, and to establish a basic procedure for changing the electric power supply system that can be referred to in the future for the modernization of North Korean railway.

AC 및 DC 전력공급구간 운전을 위한 도시철도용 추진제어시스템의 구조 및 제어 알고리즘 개발

이창희,이주 전력전자학회 2019 전력전자학회 논문지 Vol.23 No.2

This study proposes a AC/DC railway vehicle control algorithm that enables simultaneous driving of AC and DC power supply sections. In the Seoul metropolitan region, trolley voltage for railway vehicle is divided into AC and DC power supplies. Therefore, AC/DC railway vehicle algorithm is essential for driving on the outskirts of the region. This study analyzes resonance and beat phenomena for simultaneously running in AC and DC power supply sections, and proposes a control algorithm for railway vehicles with the application of damping and beatless controls based on this analysis. The performance of the proposed algorithm is verified by simulation and analysis of actual driving results.

교직절환 스위치 동작 점검 회로

구희수(Hee Soo Koo) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10

본 논문은 AC,DC 겸용 차량에 설치되는 교직 절환스위치의 유지보수를 위한 회로를 별도로 구현하여 편리성을 증대하기 위함이다. 기존 제어 방식의 경우, 판토그래프가 가선에 접촉하면 AC 또는 DC 전원임을 감지하는 릴레이가 동작을 하고 해당 릴레이의 접점을 이용하여 교직 절환 스위치가 동작을 하도록 되어있다. 우크라이나와 같이 결빙이 수시로 이루어지는 열악한 기후환경에서 전동차 운행을 할 경우, 교직 절환 스위치의 물리적 결빙으로 인한 고장은 영업운행중 교직 절환이 이루어지는 시점에서야 파악을 할 수가 있다. 이는 영업중단이라는 중대한 사고와도 직결될 수 있으므로 이를 방지하기 위한 사전 점검을 증대시킬 필요성이 있다. This paper is to propose the testing circuit for AC/DC changeover switch which is used in the train having AC/DC power sources. In before logic, when pantograph touches the high voltage catenary, ACVR or DCVR relay detects the power source is AC or DC and its contact makes it possible AC/DC changeover switch operates. This is the sequence AC/DC changeover switch operates. But one day, a problem had been occurred. It was winter season in Ukraine, cold weather made AC/DC changeover switch frozen. Even ACVR and DCVR were normally operated but AC/DC changeover switch wasn’t. Due to this accident, service operation was canceled and many passengers had experienced inconvenience. To prevent such an accident, one point should be considered before service operation. This paper describes the method to check the condition of AC/DC changeover switch logically. It shall be useful and efficient in railway industry.

A Novel Fault Location Scheme on Korean Electric Railway System Using the 9-Conductor Representation

Changmu Lee,Hansang Lee,Dong-Hee Yoon,Hanmin Lee,Jiyoung Song,Gilsoo Jang,Byungmoon Han 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.2

This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because of long distance, 40[㎞] or above, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, it must be modeled exactly to analyze the fault current magnitude and fault location. In this paper, suggesting the novel scheme of fault location, a 9-conductor modeling technique including boost wires and impedance bonds is introduced based on the characteristics of Korean AC electric railway. After obtaining a 9-conductor modeling, the railway system is constructed for computer simulation by using PSCAD/EMTDC. By case studies, we can verify superiority of a new fault location scheme and propose a powerful model for fault analysis on electric railway systems.

Development of AC/DC Hybrid Simulation for Operator Training Simulator in Railway System

Yoon-Sung Cho,Hansang Lee,Gilsoo Jang 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

Operator training simulator, within a training environment designed to understand the principles and behavior of the railway system with respect to operator’s entries and predefined scenario, can provide a very strong benefit in facilitating operators’ handling undesired operations. This simulator consists of computer system and applications, and the purpose of applications is to generate the power and voltage and analyze the AC substation and DC railway, respectively. This paper describes a novel approach to the new techniques for AC/DC hybrid simulation for the operator training simulator in the railway system. We first propose the structure the database of railway system. Then, topology processing and power flow using a linked-list method based on the proposed database, full or decoupled newton-rapshon methods are presented. Finally, the interface between the analysis for AC substation using a newton-rapshon method and the analysis for DC railway system using a time-interval power flow method is described. We have verified and tested the developed algorithm through the extensive testing for the proposed test system. To demonstrate the validity of the developed algorithm, comparative simulations between the proposed algorithm and PSS/E for the test system were conducted.

Development of AC/DC Hybrid Simulation for Operator Training Simulator in Railway System

조윤성,장길수,이한상 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

Operator training simulator, within a training environment designed to understand the principles and behavior of the railway system with respect to operator’s entries and predefined scenario, can provide a very strong benefit in facilitating operators’ handling undesired operations. This simulator consists of computer system and applications, and the purpose of applications is to generate the power and voltage and analyze the AC substation and DC railway, respectively. This paper describes a novel approach to the new techniques for AC/DC hybrid simulation for the operator training simulator in the railway system. We first propose the structure the database of railway system. Then, topology processing and power flow using a linked-list method based on the proposed database,full or decoupled newton-rapshon methods are presented. Finally, the interface between the analysis for AC substation using a newton-rapshon method and the analysis for DC railway system using a time-interval power flow method is described. We have verified and tested the developed algorithm through the extensive testing for the proposed test system. To demonstrate the validity of the developed algorithm, comparative simulations between the proposed algorithm and PSS/E for the test system were conducted.

Development of AC/DC Hybrid Simulation for Operator Training Simulator in Railway System

Cho, Yoon-Sung,Lee, Hansang,Jang, Gilsoo The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

Operator training simulator, within a training environment designed to understand the principles and behavior of the railway system with respect to operator's entries and predefined scenario, can provide a very strong benefit in facilitating operators' handling undesired operations. This simulator consists of computer system and applications, and the purpose of applications is to generate the power and voltage and analyze the AC substation and DC railway, respectively. This paper describes a novel approach to the new techniques for AC/DC hybrid simulation for the operator training simulator in the railway system. We first propose the structure the database of railway system. Then, topology processing and power flow using a linked-list method based on the proposed database, full or decoupled newton-rapshon methods are presented. Finally, the interface between the analysis for AC substation using a newton-rapshon method and the analysis for DC railway system using a time-interval power flow method is described. We have verified and tested the developed algorithm through the extensive testing for the proposed test system. To demonstrate the validity of the developed algorithm, comparative simulations between the proposed algorithm and PSS/E for the test system were conducted.

A Novel Fault Location Scheme on Korean Electric Railway System Using the 9-Conductor Representation

Lee, Chang-Mu,Lee, Han-Sang,Yoon, Dong-Hee,Lee, Han-Min,Song, Ji-Young,Jang, Gil-Soo,Han, Byung-Moon The Korean Institute of Electrical Engineers 2010 Journal of Electrical Engineering & Technology Vol.5 No.2

This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because of long distance, 40[km] or above, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, it must be modeled exactly to analyze the fault current magnitude and fault location. In this paper, suggesting the novel scheme of fault location, a 9-conductor modeling technique including boost wires and impedance bonds is introduced based on the characteristics of Korean AC electric railway. After obtaining a 9-conductor modeling, the railway system is constructed for computer simulation by using PSCAD/EMTDC. By case studies, we can verify superiority of a new fault location scheme and propose a powerful model for fault analysis on electric railway systems.

철도 급전계통 해석을 위한 컨버터 기반 부하 모델링

손호익(Ho-ik Son),유형준(Hyeong-Jun Yoo),김학만(Hak-Man Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.12

Since electric railway load is variable largely due to starting and braking characteristics as well as various operation patterns, load modeling is not easy but complicated. For this reason, a simple technique for modeling of electric railway load of is required to analyze the AC substation system of electric railway. In this paper, a modeling technique of converter-based electric railway load is proposed and is tested using nonlinear loads on Matlab/Simulink.

화물 전기기관차의 교직 겸용 개조방안 연구

이건복,이장무,김명룡,박진혁 한국철도학회 2022 한국철도학회논문집 Vol.25 No.12

A study was conducted on the modification plan of AC/DC combined use for the operation of a South Korea electric locomotive in North Korea. By comparing the circuit structure of the existing AC/DC combined vehicle, the necessary modifications were derived, and a modification plan for each item was suggested. In the modification plan, it is suggested to add an AC/DC changeover switch that can select AC 25kV or DC 3kV depending on the power source, a DC circuit breaker that can break DC current, and contactors for separating modules. It is also suggested that small modifications of the existing electric locomotive could make it possible to operate in North Korea. In addition, it was shown that it is possible to use the existing device as it is by directly connecting a DC power source to the power conversion device, and supply power to an auxiliary power conversion device having a different DC voltage by using the reverse control of the converter.