Abstract
An improved extended state observer is designed to eliminate the influences of speed control for a permanent magnet synchronous motor. The improved extended state observer is designed based on a new nonlinear function. This function exhibits better continuity and derivability than previously available functions and can effectively reduce the high-frequency flutter phenomenon. The nonlinear dynamics, model uncertainty, and external disturbances of the permanent magnet synchronous motor speed control system are extended to a new state. The improved extended state observer is utilized to observe this state. The overtime variation of the permanent magnet synchronous motor speed control system can be predicted and compensated in real time by the improved extended state observer. Therefore, the improved extended state observer, which is designed based on the new nonlinear function, can eliminate the disturbances on the permanent magnet synchronous motor speed control system. Finally, simulation experiments are performed and results show that the permanent magnet synchronous motor speed control system with improved extended state observer exhibits better performances.
Highlights
Speed control of the permanent magnet synchronous motor (PMSM) is the core of the PMSM control system
The control strategy based on an improved extended state observer (ESO) does not depend on the precise model of a control object, and the disturbances of the system can be eliminated in real time by the improved ESO
This study proposes an improved ESO based on a new nonlinear function, and a control strategy based on the improved ESO is designed
Summary
Speed control of the permanent magnet synchronous motor (PMSM) is the core of the PMSM control system. The ESO can estimate both the states and the disturbances simultaneously, so the composite speed controller can use a corresponding part to compensate for the disturbances.[6] A sliding mode and active disturbance rejection control based on ESO was employed to regulate the speed of a PMSM. This proposed control scheme ensures speed control accuracy and improves the robustness and anti-load disturbance ability of the system.[7] noise of the speed control for PMSM was not eliminated sufficiently when the differentiation was estimated. Equation (3) can be obtained according to the expression of G1 v Uq s2 b + 2jvns + v2n ð3Þ
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