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We present, for the first time, a formal stability proof for velocity control in induction motors fed by three-phase inverter-DC/DC Buck power electronic converters as power amplifier. Although our result is local, we take into account the complete dynamics of the induction motor and the three-phase inverter-DC/DC Buck power electronic converter system. Despite the complexity of the problem, our proposal is based on several proportional-integral control loops. The key to achieve this result is a novel passivity-based approach that we call energy-based control having a number of advantages over previous passivity-based approaches in the literature. An important problem that is considered is that of an unbalanced three-phase voltage source. This condition appears during the transient periods in the inverter-DC/DC Buck power electronic converter system. This is important because the standard models of induction motors are obtained under the assumption of a balanced three-phase voltage source.

Velocity control of an induction motor fed by an inverter-DC/DC Buck power electronic converter