Oscillation damping in inverter-fed induction motor

摘要

A procedure for damping the LF oscillations in a voltage-fed multi-phase induction motor has a correction parameter determined from the stator current phasor deduced from all but one phase current. This parameter is superimposed on a frequency setpoint. To evaluate the parameter, the stator current phasor is resolved into its orthogonal alpha and beta axis components which are transformed into rotating stator voltage-oriented current components. At least one of these is differentiated and finally multiplied by a weighting factor. For a current-fed motor, the same procedure is followed except that voltage phasors and components are used.