Integral Super Twisting Sliding Mode Based Sensorless Predictive Torque Control of Induction Motor

Abstract

In the direct torque control (DTC) of induction motor (IM) drive systems utilizing model predictive torque control (MPTC) in the inner loop and classical proportional integral (PI) control in the outer loop is prone to weaknesses, such as uncertainties, external disturbances, parameter variations, and nonlinear dynamics. A high-performance control system for speed and torque is required to guarantee a smooth and robust control architecture that can withstand such unpredictable effects. In this study, we propose an integral super twisting sliding mode control (ISTSMC) to address the shortcomings of the classical PI used in the outer loop of DTC drive systems. A sliding mode speed observer is also designed and utilized to overcome problems associated with mechanical sensors. The robustness of the proposed control strategy and fast dynamic speed response are compared favorably with a benchmark PI controller and conventional sliding mode control (SMC). The ability of the proposed system to regulate both speed and torque was evaluated through simulations, under various fault perturbations, parameter variations, and load disturbances, conducted in MATLAB/ Simulink. Various performance indices were used to demonstrate the superior performance of the proposed strategy compared to a benchmark PI system and conventional SMC-based MPTC approaches.

Overview of Fundamental Frequency Sensorless Algorithms for AC Motors: a Unified Perspective

“…Improvement is expected by further designing SM surfaces. For example, SM surface involving current error integral ĩ dt (see, e.g., [52]) preserves observer robustness during reaching phase [53], [54]. SM surfaces involving current error derivativei promise faster observer convergence (i.e., "convergence in finite time"), including the fast terminal SM manifold [55] and the non-singular terminal SM manifold [46].…”

Overview of AC Motor Sensorless Algorithms: a Unified Perspective

“…EMF-type CAO, as shown in Fig. 3, is implemented in [6], [43], [44], [52], [54], [57], [61]. Flux-type CAO can be found in [82], but what is much more often to see is to use the angle of the flux estimate to build a position-type CAO-which is also known as phase-locked loop (PLL).…”

Torque Ripple Suppression of PMSM Based on Robust Two Degrees-of-Freedom Resonant Controller

“…Different from the previous study, a series connect structure has been designed in this paper, which is more straightforward and simpler. Meanwhile, the fractional-order calculus is introduced to the resonant term, which can further improve harmonic suppression performance (see references [27][28][29][30][31] for detailed information about the fractional order system).…”