Novel High Gain Multiport Isolated DC-DC Converter with Bipolar Symmetric Outputs

Due to their superior reliability, efficiency, and robustness as compared to unipolar dc grid systems, bipolar dc grid systems are quickly gaining traction for renewable energy integration. However, progress in developing multiport converters resulting in lower costs, more compact designs, and higher power density in bipolar microgrid systems has been slow. As a result, a new isolated multiport dc-dc converter with bipolar inherently symmetric outputs (MIBDC) is proposed in this study. The suggested converter has a competitive advantage over its few counterparts in terms of the number of input ports, voltage gain, and natural symmetry of the outputs. Furthermore, because the proposed MIBDC uses a fixed transformer with only one primary and secondary winding for any number of inputs, it considerably decreases component count and control complexity. The proposed converter's operation is quantitatively tested in simulation and on OPAL-OP5700 RT's hardware-in-the-loop (HIL) validation platform for independent and simultaneous power transfer from multiple sources with varying voltages.