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Design and analysis of frequency modulated DAB-MSPRC for V2G and G2V applications

A Three level Dual Active Bridge - Modified Series Parallel Resonant Converter (DAB-MSPRC) for Vehicle to grid (V2G) and Grid to vehicle (G2V) applications is proposed in this paper and its analysis and design considerations are explained in detail. Frequency control technique is implemented to regulate the converter output voltage for wider load range. The parasitics in the high frequency transformer are incorporated as the elements of filter tank to eliminate the harmonics. By implementing three level inverter on the primary side, only half of the supply voltage is applied as switch stress. The bidirectional capability of the converter helps in achieving vehicle to grid and grid to vehicle power transfer. The converter is analysed theoretically by First Harmonic Approximation method and it is verified using PSIM simulations. A systematic design procedure for a 3.3kW converter at a rated voltage of 300V is presented. The primary and secondary switches attain soft switching in Constant Current (CC) charging mode, Constant voltage (CV) charging mode and in discharging mode.