无线电能传输技术及其在轨道交通中研究进展

用新型无线电能传输技术(wireless power transfer, WPT)为轨道交通供电能够降低牵引供电系统维护成本,提高安全性,是未来重点发展的新型牵引供电技术之一.首先阐述了辐射式、电场耦合式及电磁耦合式三种主要WPT技术的特点,并重点介绍了电磁耦合式WPT技术在轨道交通中应用原理.回顾了国内、外轨道交通WPT技术的研究现状,指出大功率高频逆变器、分段供电技术、电磁耦合机构设计、系统优化和控制、谐振频率稳定控制是WPT技术在轨道交通应用中的几大关键技术及关键问题,并对以上关键技术的现有研究成果进行了总结和分析.分析表明,当前对轨道交通WPT技术的研究应集中在研制大功率高频谐振逆变电源、分段供电技术及系统优化方面,对轨道交通WPT技术传输功率及效率的提高、系统稳定性的提升及工程应用可行性具有重要意义. 

Wireless Power Transfer Technology and Its Research Progress in Rail Transportation

Implementation of wireless power transfer (WPT) in traction power supply systems in rail transit could reduce maintenance cost and enhance safety dramatically, and hence is regarded as one of the most promising technologies in future traction power systems. First, technical characteristics of three main WPT technologies, i.e. radiative, capacitive, and inductive WPTs, are introduced with an emphasis on the working principle of the inductive WPT in rail transportation. Then, the current research status of WPT technologies for rail transit in China and abroad are reviewed. High-power high-frequency inverter, segmented power supply, magnetic coupler design, system optimization and control, and resonance stabilization are the key technologies and primary concerns in the progress of wireless power transfer in railway transportation. A detailed review on these technologies are also provided. Current trends of rail transportation-oriented WPT include development of high-power high-frequency resonant inverter, power supply segmentation, and system optimization. Researches in these key technologies will help boost WPT transfer power and efficiency, system stability, and engineering feasibility.