关键词: 三相交错并联 Buck 变换器, 无模型预测控制, 非线性扩张状态观测器

Abstract: To solve the problem of control performance degradation caused by internal and external disturbances of three-phase interleaved buck converter in working conditions, a model-free predictive control strategy based on a nonlinear extended state observer ( NESO-MFPC) was proposed. A ultra-local model was established to replace the original physical model to reduce the dependency of system model accuracy. A nonlinear extended state observer was designed to estimate the uncertain part of the ultra-local model, which improved anti-disturbance ability by compensating disturbance to prediction model. Model-free predictive control was adopted based on the deadbeat control method to achieve better dynamic performance. The simulation results validate the better dynamic and steady-state performance and stronger robustness of NESO-MFPC compared with conventional method.

Key words: three-phase interleaved Buck converter, model-free predictive control ( MFPC), nonlinear extended state observer( NESO)