Study of a High-Gain Two-Port Power Converter with Fuel Cell/Battery Sources and Stacked Output for Hybrid Electric Vehicle and DC-Microgrid

摘要

In this paper, a novel high-gain two-port power converter with fuel cell（FC）and battery sources and stacked output for hybrid electric vehicle（EV）connected to dc-microgrid is proposed. In the proposed power converter, the loads power can be flexibly distributed between input sources. Also, charging or discharging of battery storage device by FC source can be controlled properly. The proposed converter has several outputs in series to achieve a high-voltage output which makes it suitable for interfacing to EV and dc-microgrid. Depending on charging and discharging states of the battery storage device, two different power operation modes are defined. The proposed power converter has just one boost inductor integrated with a flyback transformer, the boost circuit output terminals and flyback circuit output terminal are stacked to increase the output voltage gain and to reduce the voltage stress on the power devices. The operational principle and steady-state analysis are described for each operation mode. The validity of the proposed power converter and its performance are verified by simulation and experimental results for different operation conditions.