Feasibility Study on Mega-Watt level Fast charging system for shore power supply using wireless power transfer technology

Abstract

This paper investigates the challenges associated with building MW level wireless chargers using inductive power transfer (IPT) technology for marine energy storage systems. Currently, the highest power capacity for the IPT system is 1 MW by Korea RailRoad Institute for high in-motion charging of speed trains. However, for stationary charging applications, maximum power capacity implemented using IPT is only up to 200 kW accomplished by Bombardier PRIMOVE for bus charging. For marine application, charging can take place at quay, therefore only static charging is possible. In this paper, the specifications of MF Ampere ferry have been used for the feasibility study. Through analytical calculations and PSIM Simulation, it was established that several low powers (100 kW IPT systems) need to be paralleled for 1 MW power transfer. Building a single unit of 1 MW is not feasible due to involved voltage and current stress across the components and limited space available onboard as well as onshore. 100 kW power level can be implemented despite of involved misalignments. However, if primary is somehow kept stationary with respect to secondary, for example using vacuum pad mooring technology developed by Wärtsilä and Cavotec, then a single unit of 200 kW could be implemented without any forced cooling. 10 units of 100 kW (without any mechanical mooring assistance) or 5 units of 200 kW (with mechanical mooring assistance) are the two proposed solutions for implementing a fast charger for 1 MW level.

Research on Constant Current Output of Wireless Charging System for Unmanned Surface Vehicles

“…As more and more unmanned surface vehicles are hybrid or fully battery-powered, Wireless Power Transfer (WPT) is increasingly becoming a focus of research and application [1][2][3][4] . This method can be used to recharge batteries, power equipment on board or directly drive motor drives.…”