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Wan Noraishah Wan Abdul Munim,Mahdi Tousizadeh,Hang Seng Che 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
Recently, there has been increased interest in the study of multiphase machines due to their higher fault-tolerant capabilitywhen compared to their conventional three-phase counterparts. For six-phase machines, stator windings configured with a singleisolated neutral (1N) provide significantly more post-fault torque/power than two isolated neutrals (2N). Hence, this configuration ispreferred in applications where post-fault performance is critical. It is well known that min-max injection has been commonlyused for three-phase and multiphase machines in healthy condition to maximize the modulation limit. However, there is a lack ofdiscussion 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 controlon the voltage and speed limit of a symmetrical six-phase induction machine with single isolated neutral. It is shown that themin-max injection can minimize the amplitude of reference voltage, which maximizes the modulation index and post-fault speedof the machine. This in turn results in a higher post-fault power.
Munim, Wan Noraishah Wan Abdul,Tousizadeh, Mahdi,Che, Hang Seng The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
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.