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6단자망 회로모텔을 이용한 전기철도 급전시스템의 고조파 해석
창상훈,오광해,김주락,김정훈 대한전기학회 2002 전기학회논문지A Vol.51 No.6
- Recently, traction motors in trains are supplied with single phase a.c. power. After this power is converted to d.c. power, it is inverted to three phase power to operate traction motors. As going through the process of the conversion, harmonic current is generated in train.The method of conventional analysis on harmonics, studied by RTRI, is modeled with equivalent circuit of ac AT-fed electric railroad system using by the distributed constant circuit. However, this circuit as two-port network model has some difference in comparison with real system. The reason why the conventional method is different from the real system is that the conventional method dose not include three conductor groups, that is catenary, rail, and feeder, and admittance between the conductors for line capacitance. Therefore, this method has a little error.This paper proposes new method to more effectively estimate Harmonic current. In this method, numerous components in electric railway are categorized and each component is defined as a four-port network model. The equivalent circuit for the entire power supply system is also described into a four-port network model with connections of these components. In order to evaluate the efficiency and the accuracy of a proposed method, it is compared with values measured in Kyung-Bu high speed line and ones calculated by the conventional method.
전기철도 교류급전 시스템의 회로 모델링 및 해석기법 연구
창상훈,김주락,홍재승,오광해,김정훈 한국철도학회 2000 한국철도학회논문집 Vol.3 No.4
This paper presents an advanced approach to simulate AC electric railway system in steady-state. The algorithm consists of two parts. One is circuit modeling of elements of electric railway system, the other is an analysis on electric circuit. The modeling procedure has two steps, in the first step, proposed is the modeling method which is considered to be an internal impedance of the autotransformers and mutual impedances between the feeding systems. For the load(locomotives) modeling which is the second step, improved results are obtained as application to the proposed constant power model compared with constant impedance model. In the analysis on electric circuit, a generalized analysis method using the loop equation has been proposed and there is no limit in the number of trains between the ATs. In addition, the computer simulation by the proposed model was practiced. Simulation result seems very reasonable. It is therefore concluded that techniques for the electric circuit modeling and analysis have been established. Accuracy of the techniques will be further investigated.
창상훈 한국철도학회 1999 한국철도학회지 Vol.2 No.4
세계철도의 기술발전과 철도기술의 세계화, 철도 전문가간의 화합을 위해 2년마다 개최되는WCRR이 금년으로 4회째를 맞게 되었다. 그동안 WCRR의 성과라면 유럽철도의 통합을 이를 수 있는 기술개발의 장(場)으로서의 역할을 충분히 담당하여 왔으며, 각 분야별 기술발전의 동향의 분석에 크게 기여해 왔음은 주지의 사실이다. 그러나 지금까지의 WCRR은 유럽 중심의 학술대회로 치중된 느낌이 들었으나, 이러한 시점에서 아시아에서 처음으로 일본에서의 WCRR' 99 개최는 특별한 의미를 지닌다고 볼 수 있다.(중략)
고속철도 전차선로시스템의 가공지선에 의한 낙뢰 차폐효과 분석
창상훈 대한전기학회 2023 전기학회논문지 Vol.72 No.11
This paper is verified the lightning shielding effect of overhead ground wire(OHGW) on high-speed railway catenary systems. The simulation results show that OHGW can effectively shield lightning current, resulting in a significant reduction in leakage current and improved lightning protection performance. The simulation was conducted using EMTP-ATP, which are widely used to analyze transient phenomena in power systems. The ground resistivity was assumed to be 1,000 [Ω·m]. The lightning shock withstand voltage of the catenary insulator was set to 250 [kV] and 380 [kV]. The lightning current was varied from 1 to 30 [kA]. As a result, when OHGW is installed in a bridge section where there is a risk of lightning, the minimum flashover current increases from 8 [kV] to 10 [kV] when the catenary insulator is 250 [kV]. At 380 [kV], the minimum flashover current increases from 14 [kV] to 17 [kV]. The results of this study suggest that OHGW is an effective way to improve the lightning protection performance of high-speed railway catenary systems.