PI model predictive control algorithm for bidirectional active full bridge DC-DC converter

Abstract

This article takes the full-bridge DC-DC converter with bidirectional flow in the power electronic transformer as the research object, The problem of large inductor current ripple caused by the unfixed operating frequency of the switch tube, a vector action time PI predictive control is proposed. The predictive control module is used to replace the traditional fuzzy PI double closed loop control, the vector action time is calculated, and the improved objective function is designed. Realize fixed frequency control. Finally, the experimental comparison and verification are carried out through the matlab simulation experiment. The experimental results show that the method not only reduces the current ripple, but also suppresses the DC bus voltage fluctuation and improves the dynamic performance and response speed of the system when the load changes suddenly. Used in photovoltaic power generation system to enhance the anti-interference ability of the system.