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Energies 2018, 11(7), 1796; https://doi.org/10.3390/en11071796

Six-Phase Space Vector PWM under Stator One-Phase Open-Circuit Fault Condition

College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
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Received: 9 June 2018 / Revised: 2 July 2018 / Accepted: 4 July 2018 / Published: 9 July 2018

Abstract

The torque pulsation and speed pulsation of a six-phase induction machine with double Y-connected windings displaced by 30° increase after one phase of the stator winding is open-circuited. To reduce the pulsations, a method of six-phase space vector pulse width modulation (PWM) with fault-tolerance is proposed. The star point of the open-circuit winding group is connected to the centre point of the converter DC voltage. The 32 column matrices, which represent 32 stator winding voltages, are mapped to the d-q and z1-z2 planes using a new five-dimensional orthogonal matrix; then, 32 basic vectors are obtained. By using an optimal model, six auxiliary vectors and an equivalent null vector are constructed, the magnitudes of which are all zero in the z1-z2 plane. By using the auxiliary vectors and equivalent null vector, the reference vector is synthesized, the zero magnitude of which in the z1-z2 plane can suppress the harmonic voltages, and the circular trajectory of which in the d-q plane can make the torque smooth. The simulation and experimental results show that the torque pulsation range and speed pulsation range of the proposed method with fault-tolerance are 30% and 25% of those of the classical method without fault-tolerance, respectively. Thus, the phase-deficient operation performance of the system is improved. View Full-Text
Keywords: six-phase induction machine; open-circuit fault; space vector pulse width modulation (SVPWM); auxiliary vector; phase-deficient operation six-phase induction machine; open-circuit fault; space vector pulse width modulation (SVPWM); auxiliary vector; phase-deficient operation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zheng, J.; Huang, S.; Rong, F.; Lye, M. Six-Phase Space Vector PWM under Stator One-Phase Open-Circuit Fault Condition. Energies 2018, 11, 1796.

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