Single-Phase Grid-Connected Fault Tolerant Bi-directional Power Flow Converter for Electric Vehicle Charging System

In this paper, a $1-\varphi$ grid-connected bi-directional power flow converter for an electric vehicle charging system is proposed. The power converter can operate well under faulty conditions of the power electronics switches for feeding power to the grid and battery charging operation. The H-bridge configuration of 1$-\varphi$ converter under open-circuit (O.C) fault in the switches is capable to provide battery charging with grid side power quality norms. The adopted control strategy maintains the UPF at the utility side and also reduces the THD of the source current under healthy and O.C fault conditions. Different controller bandwidths are selected for the stability analysis of the outer loop. An adaptive resonant controller is implemented in the current control loop. The performance of the proposed converter and its control strategy are validated through the simulation and experimental results. An experimental test set up of 250 W is developed and tested in the laboratory.