A comparative study between two nonlinear control techniques for induction motor drives

In this paper a comparison is made between two nonlinear control techniques for induction motors, namely Lyapunov-integral control and conventional direct vector control. The latter uses nonlinear state feedback in an "ad-hoc" manner while the former systematically derives the nonlinear feedback laws to ensure that the output-tracking errors are zero. The comparison has been done studying their differences analytically and testing the two controllers in the same conditions. Simulation and experimental results show that Lyapunov-integral and traditional vector controllers can be applied in discrete time with low sampling frequency (2 kHz), obtaining approximately the same performance.