Vector control for induction motor drives based on adaptive variable structure control algorithm

Abstract

This paper presents a new adaptive robust control for induction motor drives. The proposed control scheme is based on the so‐called field oriented control theory that allows to control the induction motor like a separately excited direct current motor drive, where the field flux (produced by the field current) and the armature flux (produced by the armature current) are decoupled. The robust control law is based on the sliding mode control theory, but unlike the traditional sliding mode control schemes, the proposed design incorporates an adaptive switching gain that avoids the need of calculating an upper limit of the system uncertainties. Moreover the proposed control law is smoothed out in order to avoid the high control activity inherent to the switching control laws. The resulting closed loop system is proven to be stable using the Lyapunov stability theory. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society

A Quasi‐Sliding Mode Observer‐based Controller forPMSMDrives

“…Performances of electric drive systems are strongly affected by possible disturbances perturbing both the electrical and mechanical subsystems, as well as by ineffective speed measurement. The nonlinear control strategy known as variable structure control (VSC) [1][2][3][4][5][6][7][8] is widely recognized as being able to provide robustness to matched uncertainties [9][10][11], featuring also computational simplicity with respect to other robust control approaches and being well suited for implementation on motor drive low-cost DSP. VSC schemes are typically affected by chattering of the control signal but, as discussed in [12,9,13], this well-known implementation drawback of VSC does not cause difficulties for electric drives since the on-off operation mode is the only admissible one for power converters.…”

Robust Bumpless Transfer Design Using Adaptive Sliding Mode Approach

“…Particularly, the adaptive sliding mode control has the advantages of combining the robustness of variable structure methods with the tracking capability of adaptive control strategies. Different adaptive sliding mode control strategies have been presented and widely applied to many practical control problems (see the early works [16,17] and other recent references [18][19][20][21][22][23]). Moreover, for switched systems, there exist only a few research results in which the sliding mode control technique is employed [24][25][26].…”

Adaptive Nonlinear Control of Induction Motors Through AC/DC/AC Converters

“…field-oriented control [5], to more sophisticated nonlinear approaches, e.g. passivity control [1], direct torque control [11], [3], or sliding mode control [10]. A control strategy that ignores the presence of the AC/DC rectifier suffers at least from two main drawbacks.…”

“…Finally, a bi-variable loop is designed to make the motor velocity track its 3 varying reference value and regulate the rotor flux norm to its nominal value. All control loops are designed using the Lyapunov and backstepping techniques [9].…”