A Novel Boost Derived Input-Parallel Output-Series DC-DC Converter for Bipolar DC Microgrid

Abstract

This paper illustrates a novel converter called Input Parallel Output Series Boost Cuk (IPOSBC) converter, designed specifically for low-voltage bipolar DC microgrid (BPDCMG) applications. The converter features a single-input dual-output configuration and utilizes an interleaved structure to minimize current ripple when connected to renewable energy sources like solar PV or storage unit like battery in the BPDCMG. The paper presents a dynamic model of the proposed converter and develops a closed-loop controller for current and voltage control operation. By connecting dispatchable sources such as batteries to the input terminals, the IPOSBC converter can also function in voltage control mode to regulate the bus voltage of BPDCMG system. Furthermore, the paper discusses an intriguing method to mitigate voltage imbalance in the BPDCMG without an active source, utilizing the IPOSBC converter as a DC compensator, like an active shunt filter or D-STATCOM in AC systems. Here, the converter operates without supplying or consuming power, except for converter losses. Simulation results depicting various operating modes are presented to validate the effectiveness of the IPOSBC converter. © 2023 IEEE.