Analysis of Dual Input Buck-Boost Converter for Solar PV Integration with Wireless Electric Vehicle Charger

Abstract
Investigation of on-board renewable solar PV and wireless EV chargingstation integration is studied in this paper. Integration of on-board solar PVpower with EV charger power will reduce the stress on the grid without theneed for extra ground for solar plant installation. A dual-input buck-boostconverter (DIBBC) is used to integrate the two power sources and chargethe EV battery. A small-signal model of the converter is used to design thecontroller for three switches of the DIBBC. The simulation model of the inte-grated solar PV system and wireless power transfer (WPT) system is designedfor charging a battery of 120V/165Ah at 130V. The hardware prototype ofthe proposed EV battery charging system is designed for 1.5kW to verify thesimulation results. WPT system is developed for circular spiral-shaped coils,which are series-series compensated for 85kHz resonance frequency. SolarPV is replaced by a solar simulator programmed to operate with the samespecifications used in the simulation. Results and analysis of the DIBBCbased charger with charging voltage 130V showed higher efficiency up to 92% when both the sources are supplying power to DIBBC. The proposedcharging system gives better efficiency with higher source voltages and whenthe difference in power supplied by the two sources is less. Thus, highervoltage sources are beneficial for improving the efficiency of the integratedcharging system. Further, loss analysis in major components of the converteris discussed.