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Multi-Resonant Control in a PV-SEPIC Fed PEV Charger with Distorted Grid Conditions

The wide variation in the EV battery voltage proportionate to the charging mileage and the demand for fast charging certainly requires a versatile EV charger to meet various battery standards. This paper demonstrates an implicit wide range of plug-in electric vehicle (PEV) charger based upon a single-ended primary inductor converter (SEPIC) and PV connectivity for improvement of grid power quality in the presence of grid abnormality. The Level-I PEV charger is uniquely identified due to its suitability to adopt a wide range of battery voltage by incorporating a two-stage decoupled control action with a front-end multi-resonant control (MRC). The implemented parallel resonant controller successfully eliminates the low-frequency odd harmonics at a very poor grid condition and maintains the unity power factor (UPF) at the utility. In addition, the photo-voltaic (PV) connectivity improves the grid reliability by providing additional power to both utility and EV unit during peak hour charging demand. The controller is developed and verified in a MATLAB/SIMULINK platform for a 3.3 kW isolated EV charger. The control implementation and EV charging phenomenon with a multi-resonant controller are also verified with the Opal-RT hardware-in-loop (HIL) simulator in presence of grid disturbances.