Abstract

The article discusses a Passivity-Based Current Control (PBCC) approach for the Versatile Buck-Boost (VBB) converter topology. The digital controller design of the VBB has enabled its suitability for various medium to high-power applications. Considering the non-linear dynamics of the VBB converter, the PBCC helps to ensure the input current regulation for power variations. Since controlling the algebraic sum of stored and dissipated energy in the VBB converter is quite challenging, the PBCC plays a crucial role in helping synthesize the control objective such that the closed-loop system can achieve asymptomatic stability and remains passive in nature. Thus, the dynamic performance enhancement could possibly be achieved by injecting a small damping into the system, which helps manage the dissipated energy efficiently. Nevertheless, the digital implementation of PBCC is equally challenging given real-time digital controller design due to the limitation imposed by various factors such as the sampling time delays, choice of numerical integration methods, and the limited memory storage, which is further detailed given the digital current control feedback system. Thus, the simulations results show stable and high performance in both buck and boost modes. © 2024 IEEE.