This paper presents a new robust sensorless control system for high performance induction motor drives fed by a matrix converter
with variable structure. The lumped disturbances such as parameter variation and load disturbance of the system are estimated by
a variable structure approach based on model reference adaptive scheme. A Reduced Order Extended Luenberger Observer
(ROELO) is also employed to bring better responses at the low speed operation. Experimental results are shown to illustrate the
performance of the proposed system.