Effects of Zero-Sequence Transformations and Min-Max Injection on Fault-Tolerant Symmetrical Six-Phase Drives with Single Isolated Neutral

Wan Noraishah Wan Abdul Munim; Mahdi Tousizadeh; Hang Seng Che

Effects of Zero-Sequence Transformations and Min-Max Injection on Fault-Tolerant Symmetrical Six-Phase Drives with Single Isolated Neutral

Wan Noraishah Wan Abdul Munim

Mahdi Tousizadeh

Hang Seng Che

Vol. 19, No. 4, pp. 968-979, Jul. 2019

10.6113/JPE.2019.19.4.968

Symmetrical six-phase

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Abstract

Recently, there has been increased interest in the study of multiphase machines due to their higher fault-tolerant capability when compared to their conventional three-phase counterparts. For six-phase machines, stator windings configured with a single isolated neutral (1N) provide significantly more post-fault torque/power than two isolated neutrals (2N). Hence, this configuration is preferred in applications where post-fault performance is critical. It is well known that min-max injection has been commonly used for three-phase and multiphase machines in healthy condition to maximize the modulation limit. However, there is a lack of discussion on min-max injection for post-fault condition. Furthermore, the effects in terms of the common-mode voltage (CMV) in modulating signals has not been discussed. This paper investigates the effect of min-max injection in post fault-tolerant control on the voltage and speed limit of a symmetrical six-phase induction machine with single isolated neutral. It is shown that the min-max injection can minimize the amplitude of reference voltage, which maximizes the modulation index and post-fault speed of the machine. This in turn results in a higher post-fault power.

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Cite this article

[IEEE Style]

W. N. W. A. Munim, M. Tousizadeh, H. S. Che, "Effects of Zero-Sequence Transformations and Min-Max Injection on Fault-Tolerant Symmetrical Six-Phase Drives with Single Isolated Neutral," Journal of Power Electronics, vol. 19, no. 4, pp. 968-979, 2019. DOI: 10.6113/JPE.2019.19.4.968.

[ACM Style]

Wan Noraishah Wan Abdul Munim, Mahdi Tousizadeh, and Hang Seng Che. 2019. Effects of Zero-Sequence Transformations and Min-Max Injection on Fault-Tolerant Symmetrical Six-Phase Drives with Single Isolated Neutral. Journal of Power Electronics, 19, 4, (2019), 968-979. DOI: 10.6113/JPE.2019.19.4.968.