• Title/Summary/Keyword: Railroad feeding system

Search Result 71, Processing Time 0.159 seconds

A Power Losses Analysis of AC Railway Power Feeding Network using Adaptive Voltage Control (능동형 전압제어를 통한 교류 전기철도 급전망에 대한 전력손실 분석)

  • Jung, Hosung;Kim, Hyungchul;Shin, Seongkuen;Kim, Jinho;Yoon, Kiyong;Cho, Yonghyeun
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.62 no.11
    • /
    • pp.1621-1627
    • /
    • 2013
  • 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 MW(23.8 %) and average 0.23 MW(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 MW(49.5%) compared to before voltage control. And, power loss of parallel feeding system is reduced the average 0.08 MW(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.

The comparison and investigation of power supply capability according to feeding schemes in AC electric railway system (교류전기철도시스템에서 급전계통 구성에 따른 급전성능 비교검토)

  • Lee, Chang-Mu;Oh, Kwang-Hae;Chang, Sang-Hun;Han, Mun-Seub
    • Proceedings of the KIEE Conference
    • /
    • 2001.07b
    • /
    • pp.1236-1238
    • /
    • 2001
  • The electrified railway has various power supply schemes. Although the identical trains are operated in same condition and the impedance of track are equal, the genealogy impedance of track is changed according to composition method of feeding scheme. So, the collection voltage of train and supplying power from railway substation are greatly unlike. For simulation of collection voltage and power supply according to feeding scheme, using 6-port network analysis proposed previously simulate collection voltage and supply power according to feeding scheme(Parallel Post feeding system, normal feeding system and tie feeding system) and compare and investigate each characteristics.

  • PDF

The Estimation of Rail Current Distribution According to Feeding Scheme (급전방식에 따른 레일전류 분포 예측)

  • Lee, C.M.;Han, M.S.;Jung, H.S.;Kim, J.R.;Kim, H.J.
    • Proceedings of the KIEE Conference
    • /
    • 2005.07b
    • /
    • pp.1619-1621
    • /
    • 2005
  • AC electric railway feeding system classifies into three groups such as normal, TIE and PP feeding method. If the feeding scheme of ac electric railway is changed, current distribution flowing through the line is also modified. And if the current distribution is altered according to the feeding scheme, returned tendency through rail load current or fault current of the train is changed. So the investigation about error correcting method of protective relay is needed considering feeding scheme. In this paper prior to error correcting of protective relay, through interpreting feeding circuit, changes in current distribution of the rail in accordance with feeding would be predicted and analyzed.

  • PDF

Relation between Induced Voltage of Rail and Feeding Line of Wireless Power Transfer System for Railway Application (철도용 무선전력전송시스템의 급전선로와 레일유기전압의 관계)

  • Kim, JaeHee;Park, Chan-Bae;Jung, Shin-Myung;Lee, Seung-Hwan;Lee, Byung-Song;Lee, Jun-Ho;Lee, Su-Gil
    • Journal of the Korean Society for Railway
    • /
    • v.17 no.4
    • /
    • pp.228-232
    • /
    • 2014
  • The magnetic field generated by the feeding line of a wireless power transfer system induces voltage on the rail of a railway system. The induced voltage of the rail can have a bad influence on the track circuit and on safety. This paper simulated three feeding lines to study the relation between the feeding lines and the induced voltage of the rail; it also proposed magnetic field distribution of the feeding line to reduce the induced voltage.

A Study on the Design Procedure of the Eight Pole Magnetic Bearings for the Inner-rotor and the Outer-rotor Type

  • Lee, Jun-Ho;Park, Chan-Bae;Lee, Byung-Song;Lee, Su-Gil;Kim, Jae-Hee;Jung, Shin-Myung;Lee, Hyung-Woo
    • Journal of Electrical Engineering and Technology
    • /
    • v.8 no.6
    • /
    • pp.1424-1430
    • /
    • 2013
  • This paper presents design procedure of the magnetic bearings used for high-speed electric machines and flywheel energy storage systems. Magnetic bearing can be categorized by inner-rotor type and outer-rotor type according to the position of the rotary disc. These two types are applicable based on application environments such as application space, required attraction force, and controllability. Magnetic bearing is generally designed based on the ratio (geometrical coefficient or geometrical efficiency) of pole width to rotor journal radius but proper ratio is only decided by the analysis. This is the difficulty of the magnetic bearing design. In this paper, proper design technology of the inner-rotor type and outer-rotor-type eight pole magnetic bearings is introduced and compared with the FEM analysis results, which verifies the proposed design procedure is suitable to be applied to the design of the magnetic bearings for the industrial applications and flywheel energy storage system.

A Study on a Catenary Impedance Estimation Technique using Boosting Current Compensation Based on Current Division Characteristics of an AT Feeding System

  • Jung, Hosung;Kim, Hyungchul;Chang, Sang-Hoon;Kim, Joorak;Min, Myung-Hwan;An, Tae-Pung;Kwon, Sung-Il
    • Journal of Electrical Engineering and Technology
    • /
    • v.10 no.3
    • /
    • pp.1370-1376
    • /
    • 2015
  • Generally, an autotransformer(AT) feeding system consists of double tracks, up and down, with the trolley wire and feeder wire of the up and down tracks connected in the sectioning post(SP). Consequently, load current or fault current flows on two tracks based on catenary impedance characteristics, making it difficult to estimate catenary impedance accurately. This paper presents a technique for the estimation of catenary impedance using boosting current compensation based on the current division characteristics of an AT feeding system to improve the operation performance of impedance relay. To verify the technique, we model an AT feeding system through a power analysis program (PSCAD/EMTDC) and simulate various operation and fault conditions. Through the simulation, we confirmed that the proposed technique has estimated catenary impedance with a similar degree of accuracy to the actual catenary impedance

A Study on the Propagation of Harmonic Current in the Traction Power Supply System (철도 전력공급시스템에서의 고조파전류 확대현상에 관한 연구)

  • Oh, K.H.;Chang, S.H.;Han, M.S.;Lee, C.M.;Shin, H.S.
    • Proceedings of the KIEE Conference
    • /
    • 1998.07c
    • /
    • pp.908-910
    • /
    • 1998
  • Modern AC electric car has PWM(Pulse Width Modulation) -controlled converters, which give rise to higher harmonics. The current harmonics injected from AC electric car is propagated through power feeding circuit. As the feeding circuit is a distributed constant circuit composed of RLC, the capacitance of the feeding circuit and the inductance on the side of power system cause a parallel resonance and a magnification of current harmonics at a specific frequency. The magnified current harmonics usually brings about various problems. That is, the current harmonics makes interference in the adjacent lines of communications and the railway signalling system. Furthermore, in case it flows on the side of power system, not only overheating and vibration at the power capacitors but also wrong operation at the protective devices can occur. Therefore, the exact assessment of the harmonic current flow must be undertaken at design and planning stage for the electric traction systems. From these point of view, this study presents an approach to model and to analyse traction power feeding system focused on the amplification of harmonic current. The proposed algorithm is applied to a standard AT(Auto-transformer)-fed test system in which electric car with PWM-controlled converters is running.

  • PDF

Scheme for Harmonics measurement in feeding System of high speed railroad (고속전철 급전계통에서의 고조파 측정 방안)

  • Choi, Heung-Kwan;Hwang, Chi-U;Yoon, Jae-Young
    • Proceedings of the KIEE Conference
    • /
    • 1998.11a
    • /
    • pp.304-307
    • /
    • 1998
  • High speed railway is under construction from Seoul to Pusan. A traveling train is large single phase load that consumes 14MW power in feeding system of high speed railroad. In this paper, measurement scheme and method of power system harmonics which are generated from those loads in railroad supply system are described. This measurement scheme will be used as a first step to pave a way to power quality management due to harmonic distortion by the highspeed rail way.

  • PDF

Analysis for Catenary Voltage of The ATs-Fed AC Electric Railroad System (교류전기철도 급전시스템의 전차선 전압해석)

  • 이승혁;정현수;김진오
    • Proceedings of the KSR Conference
    • /
    • 2002.10a
    • /
    • pp.490-496
    • /
    • 2002
  • This paper presents exact Autotransformers(ATs)-fed AC electric Railroad system modeling using constant current mode far locomotives. An AC electric railroad system is rapidly changing single-phase load, and at a feeding substation, 3-phase electric power is transferred to paired directional single-phase electric power. As the train moves along a section of line between two adjacent ATs. The proposed AC electric railroad system modeling method considers the line self-impedances and mutual-impedances. The constant current mode model objectives are to calculate the catenary and rail voltages with the loop equation. When there are more than one train in the AC electric railroad system, the principle of superposition applies and the only difference between the system analyses for one train. Finally, this paper shows the general equation of an AC electric railroad system, and that equation has no relation with trains number, trains position, and feeding distance.

  • PDF

Analysis for Catenary Voltage of The ATs-Fed AC Electric Railroad System (단권변압기 교류전기철도 급전시스템의 전차선 전압해석)

  • 정현수;이승혁;김진오
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.52 no.9
    • /
    • pp.493-499
    • /
    • 2003
  • This paper presents exact Autotransformers(ATs)-fed AC electric Railroad system modeling using constant current mode for locomotives. An AC electric railroad system is rapidly changing single-phase load, and at a feeding substation, 3-phase electric power is transferred to paired directional single-phase electric power. As the train moves along a section of line between two adjacent ATs. The proposed AC electric railroad system modeling method considers the line self-impedances and mutual-impedances. The constant current mode model objectives are to calculate the catenary and rail voltages with the loop equation. When there are more than one train in the AC electric railroad system, the principle of superposition applies and the only difference between the system analyses for one train. Filially, this paper shows the general equation of an AC electric railroad system, and that equation has no relation with trains number, trains position, and feeding distance.