Modelling of 15-phase induction motor drive for electric ship propulsion system

The naval integrated power systems (IPS) often utilize electrical machines with large number of phases and magnetic poles. This paper describes a coupled-circuit physical-variable modelling of a 15-phase 20 MW baseline induction motor driven by a voltage source inverter (VSI). The equations for the self and mutual inductance matrices for a machine with an arbitrary number of phases and/or phase groups on the stator and rotor are presented. Detailed simulation studies include normal balanced/symmetrical operation as well as abnormal operation caused by loss of two phases/windings from the same phase group. The proposed models can be used for other transient studies involving inverter-motor interaction, switching harmonics, torque ripple, multiple faults, system-level studies, survivability, reconfiguration, etc.

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