Abstract
This paper presents a cascade second-order sliding mode control scheme applied to a permanent magnet synchronous motor for speed tracking applications. The control system is comprised of two control loops for the speed and the armature current control, where the command of the speed controller (outer loop) is the reference of the q-current controller (inner loop) that forms the cascade structure. The sliding mode control algorithm is based on a single input-output state space model and a second order control structure. The proposed cascade second order sliding mode control approach is validated on an experimental permanent magnet synchronous motor drive. Experimental results are provided to validate the effectiveness of the proposed control strategy with respect to speed and current control. Moreover, the robustness of the second-order sliding mode controller is guaranteed in terms of unknown disturbances and parametric and modeling uncertainties.
Highlights
Permanent magnet synchronous motors (PMSM) have been broadly deployed in variable speed drives due to their efficiency, high power density and fast dynamics
The sliding mode control (SMC) method is applied to the speed equation of the machine and the conventional vector control, PI-based method, which is used for the electrical equation for the current control loop due to the computational burden and implementation limitation when applying advanced controllers [13]
The advantage of the second-order SMC compared to the traditional SMC is that it takes into consideration the nonlinearities and uncertainties with better performance as it includes an integral action
Summary
Permanent magnet synchronous motors (PMSM) have been broadly deployed in variable speed drives due to their efficiency, high power density and fast dynamics. The control efficiency of PMSM drives is affected by parametric inaccuracies, load disturbances and uncertainties in real applications They are nonlinear multivariable systems with modeling uncertainties and parameters changing during operation. The SMC method is applied to the speed equation of the machine and the conventional vector control, PI-based method, which is used for the electrical equation for the current control loop due to the computational burden and implementation limitation when applying advanced controllers [13] This matter will be explored in this work by considering both mechanical and electrical systems to develop a cascade structure of an advanced control strategy and using the powerful Opal-RT real time experimental system for control implementation. The proposed controller for speed and current tracking is robust against parametric variations and uncertainties in the system
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