Nonlinear Extended State Observer-based Sliding Mode Control Strategy of
PMSM against Disturbances
Abstract
This paper presents a nonlinear extended state observer-based
sliding mode control strategy of Permanent magnet synchronous motor
(PMSM) to address the poor performance of conventional double
closed-loop PI control under tough conditions. A variable speed
reaching law is proposed to balance the rapidity and robustness under
the fixed parameters of the exponential reaching law. Then, a
nonlinear extended observer is proposed to ensure the estimated accuracy
of disturbance and rotational speed. Then, a deadbeat current prediction
control is designed to replace the conventional dual PI current control
to ensure efficient current loop control of PMSM. Furthermore, the
stability proof of the proposed control strategy is developed.
Experimental results are given to validate the effectiveness of the
proposed control strategy. The proposed control approach can
effectively improve speed and current control performance with tough
conditions (e.g., speed and torque step-changes, periodic
disturbances).
