Deadbeat Predictive Control of PMSM Based on Sliding Mode Disturbance Rejection Observer
Due to the influence of temperature and other nonlinear factors,the resistance,inductance,and flux parameters of permanent magnet synchronous motor(PMSM)will change during operation,directly leading to inconsistencies between the motor parameters in the predicted current model and the actual pa-rameters,affecting the system control performance.To improve the robustness of system parameters,this paper conducts a study on parameter anti-interference based on sliding mode observer for a three-level driv-en PMSM.The current inner loop uses a constant velocity approach law sliding mode observer to estimate the total parameter disturbance suffered by the system,and real-time compensation is performed on the model current predictive controller;The outer speed loop is realized by sliding mode controller based on ex-ponential approach law;In addition,in response to the problem of large harmonic components of stator cur-rent in traditional predictive current control,an approximate two-level SVPWM deadbeat algorithm based on injection of virtual vectors is proposed.Finally,a Simulink simulation platform was built to verify the cor-rectness and robustness of the proposed control theory.
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