Application of Wireless Power Transfer to Railway Parking Functionality: Preliminary Design Considerations with Series-Series and LCC Topologies

Abstract

There is a wide literature concerning the application of inductive power transfer (IPT) to light railway systems. In this work, proposed application is innovative with respect to existing literature: static current collection on conventional railway lines is proposed in order to replace the functionalities implemented by conventional battery chargers and the so-called railway “parking” system. According to standards in force, current collection in standstill conditions is limited since pantograph contact shoes and catenary wires have to be protected by thermal overload. These limitations have to be considered since power demand for all the services installed on modern coaches should be higher than 20-40kW. This is a critical technical issue especially for long compositions that have to be prepared for service by activating on-board subsystems such as heating and air conditioning. Additional possible applications should be related to refrigerated wagons in freight compositions. In all these cases the availability of a simple, safe, and compact system should be useful to ensure a wireless power collection to on-board equipment. In this work authors introduce the proposed application and perform some preliminary design considerations. With respect to current literature on IPT systems, authors also introduce some innovative design criteria based on the analogy between resonant electrical system and corresponding mechanical ones. In this way, sizing of the proposed IPT system can be performed using modal methods that are also used for the proper sizing of mechanical vibrating systems, such as example, vehicle suspensions, or pantograph systems.

Decoupling Control Strategy of IPT System Based on Optimal Efficiency Load Tracking

“…Combined with the advantages of s-type and ptype resonances, literatures [5,6] describe the series parallel type two-element compensation (LCL), which can provide high voltage and current gain without increasing switching stress. The literature [1,7] proposed series parallel series three-element compensation (LCC), which inherited all the advantages of LCL compensation network and increased the compensation capacitor C P compared with series parallel LCL compensation circuit, thus adding one degree of freedom in the design process. Based on the analysis in the previous section, the secondary side adopts S-type compensation, and the topology of S, P, LCL, and LCC resonant compensation adopted by the primary side is shown in Figures 4(a), 4(b), 4(c), and 4(d).…”

“…The Control Ideas of reference ( [2][3][4][5][6][7][8][9][10][11][12][13][14][15]) data used to support the findings of this study have been deposited in the [DOI] repository. The Control Ideas of reference ( [1]) data used to support the findings of this study were supplied by [CNKI] under license and so cannot be made freely available. Requests for access to these data should be made to CNKI [WWW.CNKI.COM.CN].…”

“…The inductive power transmission (IPT) technology is to transfer the power from the power supply to the power load in a noncontact way, which has the advantages of safety, reliability, and flexible power supply. Therefore, the high-power induction power transmission technology and its application in urban rail transit have become the focus of research at home and abroad in recent years [1].…”

Segmented Power Supply Preset Control Method of High-Speed Rail Contactless Traction Power Supply System considering Regenerative Braking Energy Recovery

“…Furthermore, the characteristics of the ICPT system, such as short distance, high power, and high efficiency, determine its good development prospects in the field of rail transit [3]. When the train is at rest, Professor Pugi Luca of Italy proposed the innovative application of radio energy transmission technology in the railway "Parking" function (power collection under static state) [4]. South Korea has designed an MW level train contactless real-time current collection system experimental line, and its system efficiency can reach 82.7% [5].…”

Circular Coil for EV Wireless Charging Design and Optimization Considering Ferrite Saturation

“…Besides the automotive sector, in literature it is possible to find studies concerning the use of wireless transmission systems also for different applications. In [2], wireless charging for railway application is studied while in [3] a wireless charging system for underwater robotic is shown.…”