Simulation of asymmetric faults of a five-phase induction machine used in naval applications

Abstract

In naval applications high availability is a must. Therefore fault scenarios of naval drives and power-supply systems have to be simulated in detail. In order to model the physical behaviour of complex induction machines in an adequate way including asymmetric faults which are not featured by any simplified single-phase ECD, a set of differential equations has to be formulated. Though the presented approach is applied to a five-phase induction machine, it is a matter of fact, that the simulation approach can also be applied to any other kind of polyphase machine, e.g. induction machines with seven-phases or with double-star stator windings. After a brief introduction of the used simulation concept and the modeling approach for complex motor drives, the excellent performance is demonstrated with the simulation of a five-phase induction machine emulating three different failure modes occurring in one inverter phase leg: line interruption, frozen inverter state and IGBT gate defect.