A Multiport Charger for Light Electric Vehicles With Function of Powering Domestic Appliances
Sayandev Ghosh, Bhim Singh
Abstract
Power transmission from electric vehicles (EVs) occurs through vehicle to grid (V2G), grid to vehicle (G2V) and vehicle to home (V2H). However, a new perspective of considering EV as power transport device to underpriviledged households is considered in this work. In this regard, a converter solution is presented that enables battery charging of light electric vehicle (LEV) from AC as well as DC supply. Besides that, it is also capable to power the rural household appliances from the LEV battery. The converter system comprises of active bridge based single stage AC/DC converter with auxiliary DC port. The merit of the converter is that it provides solutions for multiple applications with reduced switch count. The single stage power conversion reduces the high frequency switch count for AC/DC conversion. The DC/DC interface utilizes partial circuitry to achieve the desired operation without any need for additional high frequency switches. The operation of the converter is categorized in three modes. Mode I comprises of LEV battery charging from AC grid. Mode II comprises of LEV battery charging from another EV or battery. Mode III conducts powering of household appliances by the LEV battery. The performance of the converter system is analysed under individual modes independently. The AC/DC interfacing supports unity power factor operation. Simulated analyses are performed on MATLAB/Simulink environment. Experimental investigations are performed on a lab scale prototype, which confirms satisfactory operations under each mode and the THD of the grid current is maintained within the standard of IEC61000-3-2.