Abstract
This article presents a postfault control algorithm that minimizes the stator Joule losses in multiphase induction machines under an open-phase fault and for different star connection layouts. The key novelty is that the algorithm can be applied to any configuration of a multi- n -phase machine, independently of the connection of the neutral points. The latter is analytically derived and is based on the space vector representation of the machine model. In addition, it is shown that a low number of neutral points helps to reduce the winding losses in case of an open-phase fault but requires additional control regulators and computational efforts. The theory is applied to an asymmetrical quadruple-three-phase induction machine, which is configured to represent five different motor layouts. Finally, experimental results are presented to validate the control algorithm. The optimal solution that is given in this article can be employed for the control of symmetrical or asymmetrical multiphase machines with different star connection layouts and in any open-phase postfault operation.
Highlights
W HEN reliability is an essential feature, a standard approach to enhance the fault tolerance is the redundancy of the critical systems
Multiphase drives are redundant by definition: when a phase is open, the other ones can compensate for the missing power, and reduce the performance de-rating
This paper investigates how the star connection layout affects the performance of multi n-phase induction machines under open-phase fault conditions
Summary
W HEN reliability is an essential feature, a standard approach to enhance the fault tolerance is the redundancy of the critical systems. As confirmed by recent studies, the performance of conventional control schemes for multiphase drives significantly deteriorates under open-phase faults and requires a change of the architecture toward a fault-tolerant scheme [9]. At the current state of the art, several post-fault algorithms require the numerical solution of an optimization problem with convergence methods that avoid local maximums and guarantee a global optimum solution [14] These methods can be applied to any electrical machine. Experimental results are presented to validate the post-fault control and to provide an in-depth comparison of the developed techniques for the single-, double-, and quadruplestar layouts of a twelve-phase machine
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
