关键词: 双有源全桥变换器, 无模型预测控制, 线性扩张状态观测器

Abstract: Aiming at the problem of system control performance degradation due to modeling bias and parameter disturbance in dual active full-bridge converter, a model-free predictive control strategy based on ultra-local was proposed. An ultra-local model containing only control inputs, outputs and parameter disturbance terms was constructed to reduce model parameter dependence. The unknown disturbance terms set was extended into a new state variable, and a linear extended state observer was designed to estimate and compensate for it to improve the system robustness. The discretized prediction equations and cost functions were constructed to obtain the optimal control shift ratio, and the phase-shift control was realized. The experimental results verify the effectiveness of the model-free predictive control method.

Key words: dual active full-bridge converter, model-free predictive control, linear extended state observer( LESO)