Modelling approaches for an asymmetrical six-phase machine

Abstract

Abstract−With currently available power electronic devices, the power range of a single three-phase power converter is limited well below the power ratings foreseen for remote offshore wind turbines. A solution is to use multiphase systems. By connecting each of the converters to one three-phase winding in the stator of the machine, a multiphase conversion system is obtained allowing to exploit its fault tolerance. In multiphase machines, the basic idea of the model transformations is the same as in the three-phase case, but, due to the increase in the dimension of the system, it introduces additional degrees of freedom. This work at first compares the two widely used modelling approaches regarding physical interpretation of the subspaces, harmonic mapping and representation of asymmetries applied to an asymmetrical six-phase machine. It further introduces an alternative transformation that is aimed at situations where power sharing between three-phase windings is desired and characterises its behaviour using the same figures of merit as for the existing transformations.

Performance Study of High-Speed Homopolar Inductor Alternator

“…The first three rows represent 𝛼 1 ,𝛽 1 , and zero sequence components for the first three-phase system and the next three rows represent 𝛼 2 , 𝛽 2 , and zero sequence components for the second three-phase system. With this, the two three-phase systems are addressed separately [15]. As a result, it can be confirmed with the application of the "double d-q transformation", both the three phase systems are considered separately.…”

“…Modeling methods of asymmetrical six-phase machines are studied by Zabaleta et. al [15] From the study of literature carried out, it is seen that a detailed performance analysis of HSHIA has not been carried out. For the applications mentioned, a detailed analysis of HSHIA based on requirements such as power density, efficiency, and losses is to be done.…”

Archives of Control Sciences

“…Compared to traditional drives with one three-phase winding, DTP motor drives are inherently fault tolerant, as a failure of one module does not result in complete loss of control of the vehicle. The popularity of this type of machine follows from the good trade-off between additional complexity and potential advantages [5,[8][9][10].…”

Fault tolerance of asymmetrical six-phase induction machine during single open circuit fault to three open circuit faults using GUI

“…Single isolated neutral point improves fault-tolerant as it gives additional degree of freedom [14][15][16][17]. However, it requires additional control to regulate the zero current sequence which causes distortion to the phase currents and result in losses [18,19]. Thus, in the previous research literature, the post-fault for A6-IM under one open-circuit fault (OCF) with single isolated neutral has provides better performance compared to two isolated neutrals [14,20].…”