Current Sharing Control of Multiphase Interleaving Single Inductor Four Switch Buck-Boost Converter for Energy Storage System

Due to the stochastic nature of RES energy storage systems (ESS) play a considerable role in the stability of modern microgrids. Among the possible bidirectional DC-DC converters that can connect ESS to Microgrids, the Single Inductor Four Switch Non-Inverting Buck-Boost (SIFBB) allows flexibility, due to the step-down or step-up operation. To increase the power rating while keeping a small current ripple, the multiphase interleaved connection is attractive. This paper proposes a multiphase interleaved SIFBB for ESS, and a non-linear control strategy is investigated for Microgrid connection. Lyapunov-based control also provides a large signal stability analysis of the closed-loop system. The goals are proper voltage regulation and current sharing while reducing the requirement for bulky and expensive filtering networks. Finally, the proposed system is simulated using PLECS, and results are presented. The results section also shows the hardware-in-loop (HIL) real-time tests under different scenarios to validate the strategy in real-time.