Fuel Cell-Fed High Gain DC-DC Boost Converter-Based Onboard Electrical Vehicle Charger System

Renewable energy sources (RES) like fuel cells (FC) are extensively implemented for onboard electric vehicle (EV) charging. Among the other RES and their intermittent nature, FC can provide consistent power at better efficiency, in a more reliable and environment-friendly way. A high gain DC-DC boost converter in fuel cell electric vehicle drive systems (FCEVDs) can step up the low voltage of FC and maintain DC-link voltage for suitable inverter-motor load operation. This reported work consists of an onboard charger for EV which has FC stack as an onboard main source with implementation of DC-DC high gain converter (HGC) as HGC can give low electromagnetic interference (EMI), lower switch stress and higher voltage gain, thus making it an effective power electronics interface for FC-based charger system. In this paper, study and close-loop control of an onboard charger that incorporates 90 V 12 kW FC stack as a main source, high gain DC-DC converter (HGC) interface, 3 phase inverter-1 kW BLDC motor combination as a load and an auxiliary source of 12kWh capacity 5 in-series 48 V 50Ah battery pack system is presented. The proposed work is designed in a MATLAB/Simulink environment; further it has been analysed and controlled under changing load torque and speed variations.