Switching function parameter variation analysis of a quasi-sliding mode controlled induction motor drive

Abstract

Sliding mode control is a nonlinear, robust control that is having better load disturbance rejection capability, less parameter sensitivity and fast dynamic response. Conventional sliding mode control introduces high chattering that can degrade the induction motor (IM) drive system responses. Hence, a quasi-sliding mode controller (Q-SMC) using a hyperbolic tangent function coupled with equivalent control is designed for robust speed control of vector-controlled IM drive in this work. This work focuses on the effect of variation of the switching function parameters of the Q-SMC on the performance of the drive. Extensive simulations are performed using MATLAB/Simulink software, and the switching function parameters are adjusted across a wide range and its impact on motor performance is studied qualitatively and quantitatively, with accompanying graphical results and various transient parameters. It is observed that a Q-SMC controller with a larger boundary layer width has less overshoot, less steady-state error, and a lower current THD. It is also observed that even though a high gain Q-SMC controller responds quickly, the percentage overshoot for high gain systems is likewise large. Hence, if the boundary layer width and switching gain parameters are optimized, a Q-SMC speed controller is a promising choice for a high-performance IM drive.

DSP in the loop implementation of an improved sliding mode control for induction motor drive

“…This work proposes the design of a simple rotor flux estimator generating flux magnitude and angle. In fact, only the direct component of the rotor flux has to be estimated because the quadrature one is zero in the rotor flux frame [25].…”

“…The sign function 𝑠𝑖𝑔𝑛(𝑥) in sliding mode control causes chattering and degradation of the quality of control inputs absorbed currents and controlled variables [26], [27]. The replacement of the sign function by a smooth function like inverse tangent or hyperbolic tangent functions allows to overcome this problem [25], [28], [9]. We propose ) function that can be adjusted by the coefficient 𝛿.…”

Management strategy to mitigate voltage sags effects of a multi-motors system using ADALINE algorithm and cascade sliding mode control

“…This controller generates the speed set point for M1 in a cascade-control loop structure. A speed sliding mode controller (SSMC) is designed to control the speed of an induction motor fed by three phase voltage source inverters controlled by pulse width modulation (PWM) technique [16], [17].…”

Improvements the direct torque control performance for an induction machine using fuzzy logic controller

“…One prominent control technique developed in the 1970s is field-oriented control (FOC), which offers the advantage of decoupling electromagnetic torque and flux. This enables a prompt torque response, a broad range of speed regulation, and high efficiency across a variety of loads [7], [8]. Nevertheless, field-oriented control (FOC) can be intricate and susceptible to motor parameter variations [9].…”