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High gain bidirectional multiport DC to DC converter for DC microgrid

Generally, operating voltage of photovoltaic (PV) arrays are low. To interface such systems with high voltage DC bus, a high gain converter is needed. Moreover, power generated by the PV systems is non-uniform most of the time. Therefore, for this purpose, a battery port is mandatory. Hence, for this application a high gain multi port converter is suitable candidate that increases conversion efficiency with a reduced cost. In this work, a high gain multi port bidirectional DC to DC converter for the DC microgrid application is proposed. Proposed converter has three ports. One for the power source, the second for the battery, the third for the high voltage DC Bus. Converter is analyzed in boost/battery discharging and buck/battery charging mode. Detailed theoretical analysis and operation of the converter is presented. The proposed converter has inter source and bidirectional power flow capability. A gain comparison is performed with its previous counterpart converters. A 744 W converter is simulated in the Matlab to validate the theoretical and operational analysis of the converter. Experimental results are performed using the developed prototype converter and dSPACE (DS-1104) controller.