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Induction Machine with Localized Voltage Unbalance Compensation

This paper introduces a new means of operating an induction machine which utilizes a relatively small converter circuit that is capable of maintaining balanced conditions within the machine even during periods of a voltage unbalance in its AC supply, The control method required for satisfactory operation of the circuit is described and the validity of the control method is confirmed by simulation. Finally, it is shown by experiment that the technique allows one to maintain the performance of the induction machine for both sudden voltage sag and voltage surge conditions. This proposed approach is expected to solve persistent problems such as over current, local heating, vibration and stalling when an unbalance voltage occurs.