Selected Problems of Discontinues Control of Inverter Fed Induction Motor Drives

In this Chapter a combined discontinues sliding mode control (SMC) with feedback linearization control (FLC) applied for voltage source inverter-fed induction motor are presented. The FLC guarantees the exactly decoupling of the motor speed and rotor flux control. Thus this control method gives a possibility to get very good behavior in both dynamic and steady states. The SMC approach assures direct control of inverter legs and allows using a simple table instead of performing PWM online calculation. Moreover, the SMC is robust to drive uncertainties. The good behaviour of rotor flux and mechanical speed Sliding Mode Observers (SMO) is the important feature of the system. Therefore, the presented approaches are very useful in a variety of applications and, in particular, in drive systems, robotics and power electronics.

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