Tri-modal control of FSBB with through-mode

Aiming at the problem of large output voltage fluctuation of the four-switch Buck-Boost (FSBB) converter when switching between Buck and Boost modes, this paper proposes an improved three-mode double-closed-loop control method containing three modes, namely Buck, Boost, and pass-through, by adding a pass-through mode on the basis of the traditional three-mode control. Through simulation experiments in MATLAB/Sumilink, it is verified that the improved three-mode control method proposed in this paper can effectively improve the dynamic characteristics of the FSBB converter during mode switching, which is of great significance for improving the operational performance of distributed energy storage systems.