AT급전방식 통합접지시스템의 주파수별 접지임피던스 특성 분석

창상훈(Sang-Hoon Chang) 대한전기학회 2021 전기학회논문지 Vol.70 No.10

This paper, when lightning current flows into the AT electric railway power feeding system, the ground impedance characteristics according to the length of the buried earth wire and the earth resistivity are analyzed and presented. Due to the increase in accidents caused by lightning and surges in the electric railway operation section, the need to review the grounding impedance of the electric railway integrated earthing system is increasing. The grounding system currently applied to the electric railway operation section has been considered in terms of preventing electric shock to the human body and protecting facilities in the event of a ground fault or short circuit in a commercial power supply of 60[Hz] band. Recently, electronicization of signal and communication facilities installed around railway tracks, high-quality power supply is required. Therefore, the need for technical analysis on ground impedance and transients in high-frequency bands is increasing. The ground impedance is an important factor that distinguishes the characteristics of the AT electric railway integrated earthing system.

RTDS를 활용한 전기철도 급전용 변전소 시뮬레이션 모델 개발 및 활용방안 연구

김기석(Kisuk Kim),장길수(Gilsoo Jang),이장무(Jangmu Lee),김주락(Jurak Kim) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.5

전기철도 급전시스템에서 사용되는 전력설비들을 철도급전망에 적용하기 이전에 실제 운영조건에서 검증할 수 있는 시스템이 구축되어 있지 않아, 설치 및 운용에 어려움을 발생시키고 있다. 특히 회전기와 주기적인 운전 및 정차를 반복하는 특수한 부하특성으로 인한 고조파 등의 영향으로 통신유도장해, 보호계전기 및 배전용 차단기의 오동작, 공진현상 초래 등 시설물 장애로 인한 열차운행 중단 사례가 빈번히 발생하고 있어 실시간 시뮬레이션 환경 구축을 통하여 이러한 문제를 사전에 검토하여 신뢰성을 향상시킬 필요가 있다. 컴퓨터 기술의 발전으로 실시간 시뮬레이터도 점차 고기능화 되고 있으며, 모의 대상이 되는 계통의 규모나 해석 정밀도가 지속적으로 향상되고 있어, 그 사용범위가 점차 확대되고 있다. 특히 실시간 시뮬레이터는 대전력 정격의 장비를 설치하고 시운전하는 작업이 가능하며, 현실적인 전력 수준의 환경에서 전기기기와 같은 실제의 전력 하드웨어를 시험하는 것이 가능하다. 따라서, 본 논문에서는 전기철도의 사고장애 예방 및 전력품질 향상을 모의하기 위한 실시간 시뮬레이션 모델을 개발하고, 활용하는 방안에 대하여 연구하였다. Devices used to railway feeding system is not configured system to verified for operating condition before applying it. It is may difficult to installation and operation. The functionality of real-time simulator has been grown gradually by the development of computer technology. Owing to the improvement on the simulation size and interpretation precision, the application rage of it has been gradually expanding. In particular, real-time simulator is capable of installing and testing the equipment of high power system. And it is possible to test the real hardware system such as the electrical power devices. Therefore, in this paper, study on the way to using and development to real-time simulation model for preventing of fault and improving to power quality of electrical railway.

능동형 전압제어를 통한 교류 전기철도 급전망에 대한 전력손실 분석

정호성(Hosung Jung),김형철(Hyungchul Kim),신승권(Seongkuen Shin),김진호(Jinho Kim),윤기용(Kiyong Yoon),조용현(Yonghyeun Cho) 대한전기학회 2013 전기학회논문지 Vol.62 No.11

This paper compares power losses between voltage controlled before and after using power conversion device in AC feeding system. For this purpose we present voltage control procedures and criteria and model high speed line and train using PSCAD/EMTDC to compare power losses in various feeding condition. Power losses of the simulation result in power control before and after in single point feeding system was reduced maximum 0.37 ㎿(23.8 %) and average 0.23 ㎿(20.5 %) when one vehicle load operates maximum load condition. When three vehicles operate maximum load condition in one feeder section, power losses after voltage control was reduced 1.03 ㎿(49.5%) compared to before voltage control. And, power loss of parallel feeding system is reduced the average 0.08 ㎿(7.2 %) compared to the single feeding system. In conclusion, adaptive voltage control method using power conversion device can reduce power losses compared with existing method.

전기철도차량 이선 현상 검측을 위한 TEO 및 STFT 신호처리기법 적용에 관한 연구

정노건,박철민,이재범,박영,신승권 대한전기학회 2018 전기학회논문지 Vol.66 No.11

In this paper, A technique for detecting contact loss at the input power of a railway vehicle has been studied when the contact loss occurs in the feed system. The impedance of the actual railway line was applied to the modeling of the feed system, and modeling was performed based on the performance of the electric railway vehicle. The input voltage and current of the railway vehicle through modeling were analyzed by applying TEO and STFT signal processing technique.

전기철도차량 이선 현상 검측을 위한 TEO 및 STFT 신호처리기법 적용에 관한 연구

정노건(No-Geon Jung),박철민(Chul-Min Park),이재범(Jae-Bum Lee),박영(Young Park),신승권(Seung-kwon Shin) 대한전기학회 2018 전기학회논문지 Vol.67 No.11

In this paper, A technique for detecting contact loss at the input power of a railway vehicle has been studied when the contact loss occurs in the feed system. The impedance of the actual railway line was applied to the modeling of the feed system, and modeling was performed based on the performance of the electric railway vehicle. The input voltage and current of the railway vehicle through modeling were analyzed by applying TEO and STFT signal processing technique.

강체전차선로의 특성을 고려한 급전시스템에서 이선에 따른 철도차량 전력변환장치에 대한 특성에 관한 연구

정노건(No-Geon Jung),이환(Hwan Lee),김재문(Jae-Moon Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.3

In this paper, Characteristic of power conversion unit of a railway vehicles according to contact loss in feeding system that applied impedance of rigid conductor is analyzed. It applied impedance of rigid bar in modeling of electric railway system. Railway vehicles are performed of modeling based on the performance of the electric railway vehicle. Effects of the contact loss in the power conversion unit were analyzed via main transformer of railway vehicle, the input and output voltage characteristics of the converter through contact loss was generated after linking the vehicle with feeding system.

도시철도에서 전동열차 운행에 따른 회생에너지 측정 및 분석

정현기(Jung. Hyun-Ki),권남흥(Guen. Nam-Hng),김병현(Kim. Byung-Hyun),하태요(Ha. Tae-Yo),이정구(Lee. Jung-Ku) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

직류급전 도시철도에서는 전차선로를 통해 전동열차에 직류전원을 공급하고 있으며, 전동열차는 운행 중에 역행·타행·제동 등을 반복하게 된다. 제동은 전기제동과 공기제동을 사용하게 되는데 전기제동 시 회생에너지가 발생하게 된다. 회생에너지는 차량성능, 노선상태, 운행간격, 운전속도 등에 따라 발생량이 달라지며, 발생된 회생에너지는 동일선로에서 인근의 타 전동열차에 공급되어 소모되는데 이때 소모되지 못한 잉여 회생에너지는 전차선 전압을 상승시켜 전력공급계통에 악영향을 주게 된다. 이러한 잉여 회생에너지를 활용하게 되면 에너지절감은 물론, 전력계통의 안정화도 꾀할 수 있어 최근에는 회생에너지를 저장 또는 회수하는 등 활용장치에 대한 연구·개발이 활발히 이루어지고 있는 실정이다. 따라서 본 논문은 직류급전 도시철도의 선로에서 실제 운행하고 있는 전동열차가 주행하며 발생시키는 회생에너지를 측정 분석하여 그 결과를 시스템 적용에 반영코자 한다. Urban railway using DC feeding system supply DC power through catenary to a train, the train continue powering, Coasting, braking control. Also the trains generate Regenerated energy during electric brake. Regenerated energy varies with performance of a train, condition of railway, Interval, speed, generated regenerated energy supplies to another train, at this very moment, not consumed surplus energy has a bad influence on a power supply system because catenary volt rise. If we use the Regenerated energy, we could save energy and be safe on a power system. so recently the research and development are actively progressing. Thus propose of this study is measurement and analysis of Regenerated energy generated by an operating train in urban railway using DC feeding system and we will apply the results to the system.

전기철도 급전계통 부하불평형에 대한 실험적 고찰

김재문,권호준,최용은,오효석 대한전기학회 2022 전기학회논문지 Vol.71 No.5

The domestic AC railway power supply system uses a scott transformer with two single-phase transformers T-connected for resolving the unbalance on the AC 3-phase power supply side. However, when single-phase M-phase and T-phase railway vehicles on the secondary side of the scott transformer exist as single-phase loads with different capacity, unbalance of current on the power supply side occurs. In this paper, In this paper, simulations were performed according to theoretical considerations and experiments were performed using a prototype simulator. The current unbalance on the power supply system was investigated when there was an impedance deviation between the windings of the Scott transformer and electric railway vehicles with different capacities were present on the secondary side catenary. The average error rate of the calculated value obtained through the formula and the simulation result value was within 1.68%, confirming that the implementation of railway power supply system modeling was confirmed. Also, it was confirmed that the impedance difference between the Scott transformer windings and the M-phase and T-phase load capacity unbalance cause unbalance in the current flowing in the power system.

팬터그래프 방식 전기버스 충방전 패턴에 따른 충전 시뮬레이션 비교 연구

신승권 대한전기학회 2023 전기학회논문지 Vol.72 No.12

The automotive industry is a major source of greenhouse gas emissions and the transition to eco-friendly vehicles is accelerating due to global interest in environmental sustainability. In particular, commercial vehicles such as buses and trucks emit the most greenhouse gases and are highly dependent on fossil fuels, so a transition to eco-friendliness is necessary. While various studies on electric buses are being conducted around the world, there is a noticeable gap in research related to electric bus charging systems using the urban railway power grid. Utilizing the urban rail power grid to charge electric buses provides an advantage in optimizing power demand and utilizing the urban rail network in urban areas and other areas by efficiently utilizing active power based on the maximum power of the railway. Accordingly, this paper focuses on the development and comparative analysis of a pantograph-based electric bus charging system and the existing plug-in manual charging method. The goal is to evaluate the feasibility of a pantograph-based electric bus charging system. In addition, this study investigated the impact on the load rate of the urban railway power grid by adjusting the charging amount of electric buses by time period using a random function.

직류철도 급전계통의 안전성 향상을 위한 차단기 동작 최적 설정의 실험적 고찰

이재봉(Jae-Bong Lee),정노건(No-Geon Jung),김재문(Jae-Moon Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.3

This paper presents an experimental study on the optimal settings for the selected DC fault relay (50F) to improve the operating performance for the high-speed circuit breaker on DC feeding system which ensure safety within rolling stock maintenance depot. In this study, current supplied to overhead contact wire was calculated on 1 ms interval to analyze the correction values of DC fault selective relay for the operation of current supply cutout. Particularly, standards for the accurate detection of accidents between an electric railway vehicle and the electric power facilities are shown by investigating the optimal correction values for detection of fault current, and the results indicated that it takes about 213 ms for the DC fault selective relay(50F) to fully open. In the future, the correction values of DC fault selective relay suggested in this paper will be used as the reference values of protective relay for the safe operation of DC electric railroad system such as urban railway.