• Title/Summary/Keyword: Wireless tram

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Power Distribution Strategy for Wireless Tram with Hybrid Energy Storage System (하이브리드 에너지 저장장치를 탑재한 무가선 트램의 전력분배전략)

  • Kang, Kyung-Jin;Oh, Yong-Kuk;Lee, Jee-Ho;Yeom, Min-Kyu;Kwak, Jae-Ho;Lee, Hyeong-Cheol
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.11
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    • pp.1615-1621
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    • 2014
  • A wireless tram which runs without catenary and instead uses batteries installed in the tram has been recently researched actively. This paper presents a new method maximizing absorption of regenerative energy of a wireless tram and extending life cycle of the energy storage device in the wireless tram by applying line-optimized charging and discharging scenario. Energy efficiency and life cycle of energy storage system (ESS) are highly dependent on the characteristic of operating conditions. For example, frequent charge and discharge with high power cause the problems that decrease the battery life cycles. Hybrid energy storage system (HESS) is combination of two ESSs which have complementary characteristics to each other. HESS can provide even better functionality and performance than the battery only ESS due to the synergy effect of two ESSs. This paper also provides a power distribution strategy and driving scenarios which increase the life cycle and energy efficiency of the HESS consisting of a battery and an ultra-capacitor. The developed strategy was tested and verified by a hardware-in-the-loop-simulation (HILS) system which emulates the a wireless tram.

Restoring Torque Control Strategy of IPMSM for the Independently Rotating Wheelsets in Wireless Trams

  • Oh, Ye Jun;Cho, Yonho;Kim, In-Gun;Lee, Ju;Lee, Hyungwoo
    • Journal of Electrical Engineering and Technology
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    • v.12 no.4
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    • pp.1683-1689
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    • 2017
  • Wheelsets are an important component affecting the dynamic characteristics of railway vehicles. Research on wheelsets has been conducted for a long time. It is possible to generate the restoring force by the individual torque control of the left and right wheels in the independently rotating wheelsets (IRWs). Although this method solves the problems of conventional wheelsets, such as the solid axle wheelsets, the restoring force control must be added to the existing traction force control, and the restoring force requires a higher precision and quicker response than the traction force. In this paper, we study the robust control strategy of wireless trams with independently rotating wheelsets. The interior permanent magnet synchronous motor (IPMSM) and the controller with the actual scale wireless tram are designed to verify the torque control performance. Moreover, we propose an open loop control method to test and verify the traction and restoring force control algorithm of the IRWs.

Investigation of the Bond and Deformation Characteristics between an Asphalt layer and a Concrete Slab used as the Trackbed Foundation of an Embedded Rail System for Wireless Trams (무가선 트램용 매립형궤도 아스팔트 포장층의 부착특성 및 변형발생특성 분석)

  • Cho, Hojin;Kang, Yunsuk;Lee, Suhyung;Park, Jeabeom;Lim, Yujin
    • Journal of the Korean Society for Railway
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    • v.19 no.2
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    • pp.224-233
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    • 2016
  • Embedded Railway Systems (ERS) will be adapted for wireless trams and will be constructed along city roadways. An asphalt layer should be overlaid on top of the concrete slab used as the trackbed structure in order to ensure smoothness and surface levels equal to those of existing road pavement in downtown city areas. However, the characteristics of an asphalt layer when used as overlay pavement for an ERS are complicated and the behavior of this material is not yet well defined and understood. Therefore, in this study, laboratory shear and tensile bond strength tests were conducted to investigate the bonding behavior of an asphalt layer in a multilayered trackbed section of an ERS. For the laboratory tests, a waterproof coating material was selected as a bonding material between the asphalt overlay and a concrete specimen. Valuable design parameters could be obtained based on the tensile and shear bond strength test results, providing information about the serviceability and durability of the overlaid pavements to be constructed alongside the ERS for wireless trams. In addition, a deformation analysis to assess the tensile strain generated due to truck axle loads at the interface between the asphalt layer and the concrete slab was conducted to verify the stability and performance of the asphalt layer.