A sliding mode and synergetic control approaches applied to induction motor

Induction motors are characterized by complex, highly non-linear and time-varying dynamics and inaccessibility of some states and outputs for measurements. Hence, it can be considered as a challenging engineering problem.The advent of vector control techniques has partially solved induction motor control problems. But because they are sensitive to drive parameter variations, performances may deteriorate if conventional controllers are used. Sliding and synergetic controllers are considered as potential candidates for such applications. These control approaches are developed and applied to adjust the speed of the drive system. In this paper, sliding mode and synergetic control approaches are first presented. A synergetic controller allows us to drive two different states while the sliding mode, much simpler, can drive just one state. Next, the concepts of these techniques are developed. The steps of design to develop the sliding and the synergetic speed controller applied to a field oriented controlled squirrel cage induction motor are then presented . The obtained robust controllers lead to a more effective control design with improved system performances. A simulation study of these methods is presented. The effectiveness of these controllers is demonstrated for different operating conditions of the drive system.