Research on Predictive Control Strategy for Phase Shift Full Bridge Transform Based on Improved Nonlinear Disturbance Observer

To enhance the power output performance of high-power electrolytic plating equipment and improve the dynamic response capability and disturbance rejection ability of the DC-DC converter—a core component in electrolytic plating systems—this study proposes a predictive control strategy for phase-shifted full-bridge converters based on an improved nonlinear disturbance observer. The implementation framework comprises three key technical components: Firstly, a model predictive control (MPC)-based inner-loop controller architecture is constructed to optimize the dynamic response characteristics of the current inner-loop system. Subsequently, an enhanced nonlinear disturbance observer is designed to accurately estimate parameter variations in converter electronic components and external disturbances. Finally, a feedforward compensation module is developed to mitigate the inherent duty cycle loss phenomenon in phase-shifted full-bridge converters. Simulation results demonstrate that the proposed control strategy significantly improves system dynamic performance, achieving a 25% reduction in settling time compared with conventional methods while maintaining robust disturbance rejection capabilities under ±10% voltage fluctuations. This integrated approach effectively addresses the conflicting requirements between dynamic response speed and anti-interference performance in high-power electrochemical process control systems.