Design and Control for Catenary Charged Light Rail Vehicle Based on Wireless Power Transfer and Hybrid Energy Storage System

The hybrid energy storage system (HESS) helps to lighten the power supply equipment of light rail vehicles (LRVs), and the static wireless power transfer (WPT) technology can improve the disadvantages of wired charging. This article focuses on the WPT-based charging strategy for HESS, the efficiency and cost of the WPT system are focused. Considering the specific of the HESS in the application of LRV, a charging strategy is designed and optimized to achieve the optimal efficiency tracking of the WPT system, and the strategy can also avoid the wireless communication between the primary side and secondary side. In addition, the bidirectional power flow is proposed to reduce the power level of the WPT system, which helps save system costs. Furthermore, the dynamic power allocation of HESS is improved based on the LRV operating situations, and the WPT system parameters and HESS charging parameters are optimized correspondingly. Finally, the feasibility of the charging strategy is verified by 27.8-kW WPT charging experiments.