Postfault Operation of Five-Phase Induction Machine With Minimum Total Losses Under Single Open-Phase Fault

Shawier, Abdullah; Abdel‐Khalik, Ayman S.; Ashour, Hamdy A.; Ahmed, Khaled; Ahmed, Shehab

doi:10.1109/access.2020.3036904

Cited by 17 publications

(20 citation statements)

References 37 publications

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“…Simplified implementation was addressed in [17]. The effect of rotor and core loss were addressed in [42] for a five-phase machine with significant space harmonics. For this paper, to apply the FRMLS to n-phase machines with several SWCs and two OCLs, the version of the method described in [8] for single OCL is adopted, and then an additional restriction is included for the second OCL: the corresponding line current supplied by the converter is imposed to be zero.…”

Section: Strategy For Current-reference Optimizationmentioning

confidence: 99%

Study and Active Enhancement by Converter Reconfiguration of the Performance in Terms of Stator Copper Loss, Derating Factor and Converter Rating of Multiphase Drives Under Two Open Legs With Different Stator Winding Connections

Yepes

Doval-Gandoy

2021

IEEE Access

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Multiphase machines offer inherent tolerance to faults such as open converter legs (OCLs), which are especially frequent. Because of this reason, they are particularly attractive for applications where fault tolerance is important, such as offshore wind energy or aerospace, naval and military vehicles. It has been previously shown that, under an OCL, certain stator winding configurations (SWCs) different from star yield smaller stator copper loss (SCL) and larger maximum achievable torque (MAT) than star SWC for the same torque command and machine. This advantage comes just at the expense of a moderate increase in converter rating. However, only the case of single OCL was studied in general. The SCL, MAT and required converter rating for two OCLs are currently unknown for different combinations of phase number, faulted legs and SWCs. Actually, under two OCLs (unlike for one OCL) it may be possible to actively modify the order of the faulted/healthy legs to enhance the performance in these terms, but this possibility has not been studied so far in spite of its potential. This paper addresses the postfault performance of multiphase drives with two OCLs, for various SWCs. The MAT (derating factor), SCL and necessary converter rating are assessed in numerous possible scenarios. The most convenient alternatives are established. Most importantly, in view of the conclusions of this analysis, a novel method is proposed to improve substantially the MAT and SCL by actively altering the connections between the converter and machine terminals. Experimental results with six-phase and twelve-phase setups are provided. INDEX TERMSDerating factors (DFs), fault-tolerant, five-phase, minimum copper losses, multiphase drives, six-phase, stator winding configuration (SWC), twelve-phase, symmetrical, variable speed drives. ACRONYMS DF Derating factor. FRMLS Full-range minimum-loss strategy. MAT Maximum achievable torque. OCL Open converter leg. SCL Stator copper loss. SWC Stator winding configuration. VSD Vector space decomposition. VARIABLES λ Denotes an SWC based on series connection of each pair of phases with λγ spatial step between them.

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Section: Strategy For Current-reference Optimizationmentioning

confidence: 99%

Study and Active Enhancement by Converter Reconfiguration of the Performance in Terms of Stator Copper Loss, Derating Factor and Converter Rating of Multiphase Drives Under Two Open Legs With Different Stator Winding Connections

Yepes

Doval-Gandoy

2021

IEEE Access

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“…The subspace currents could be predicted from stator and rotor equivalent dynamic equations by making use of the estimation step given by ( 10), (11) and the measured stator voltage and current as given by (12).…”

Section: B Prediction Stepmentioning

confidence: 99%

“…However, the complexity and cost of the power inverter will also dramatically increase, which practically limits the available choices in many applications to certain phase orders. On one hand, literature has extensively covered machines with prime phase orders such as five and seven phase machines [2], [11]. On the other hand, machines with multiple three-phase winding have been practically dominating since the readily commercial three-phase off-the-shelf power converters as well as available control techniques can still be recruited [12].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Predictive Current Control of Six-Phase Induction Motor With Different Winding Configurations

et al. 2021

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Asymmetrical six-phase (A6P) induction motor-based drives can be considered as a wellestablished employed technology in high-power safety-critical industry sectors. Of the different control techniques proposed for multiphase machines, model predictive control (MPC) has recently been favored thanks to its simplicity, rapid dynamic response, and flexibility to define new control objectives. One of the main operating challenges when employing MPC to A6P induction machine is the poor quality of the phase current waveform due to the relatively low impedance of the secondary subspace. Although different controller structures have been introduced in the available literature to mitigate this problem, most of the available proposals, if not affecting the dc-link voltage utilization, will likely add to the control complexity. From the stator winding layout perspective, this paper attempts to investigate the effect of different winding configurations of six-phase stators with isolated neutral arrangements on the performance of predictive current control (PCC). This study shows that the winding configuration affect the mapping of the 64 available voltage vectors to the and subspaces, the induced current ripples, and the required weighting factor employed in PCC. The theoretical findings have experimentally been validated using a 1kW twelve-phase machine that can externally be reconnected to form any of the three available six-phase winding configurations.INDEX TERMS six-phase, dual three-phase, asymmetrical, symmetrical, predictive current control, voltage space decomposing.

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“…e degrees of freedom available in 5pIM which do not exist in 3pIM have opened up many new research areas, such as different stator winding connection issues [4] or wound-rotor direct drives [5]. e possibility of redundancy in 5pIM has resulted in improvement of faulttolerant capabilities, such as open switch fault detection [6,7], open-phase fault detection and post-fault operation [8,9], or rotor-bar fault analysis [10].…”

Section: Introductionmentioning

confidence: 99%

Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines

Kyslan

Lacko

Ferková

et al. 2022

International Transactions on Electrical Energy Systems

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Five-phase induction machines (5pIMs) are a viable alternative for a wide range of industrial applications. The penetration of drives with 5pIM into industrial applications is slow because of the complexity of the proposed control algorithms. In standard V / f control of induction machines, the stator current is not controlled directly and options for current limitation are restricted. This paper hence addresses a novel current limitation technique for the V / f control algorithm of 5pIM. In addition, a simple speed sensorless control algorithm based on the slip compensation is introduced. A combination of both algorithms is suitable for low-cost medium-precision drive applications. Experimental results, realized on Texas Instruments F28335 DSP, illustrating the performance of novel current limitation technique and sensorless control, are included.

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Postfault Operation of Five-Phase Induction Machine With Minimum Total Losses Under Single Open-Phase Fault

Cited by 17 publications

References 37 publications

Study and Active Enhancement by Converter Reconfiguration of the Performance in Terms of Stator Copper Loss, Derating Factor and Converter Rating of Multiphase Drives Under Two Open Legs With Different Stator Winding Connections

Study and Active Enhancement by Converter Reconfiguration of the Performance in Terms of Stator Copper Loss, Derating Factor and Converter Rating of Multiphase Drives Under Two Open Legs With Different Stator Winding Connections

Assessment of Predictive Current Control of Six-Phase Induction Motor With Different Winding Configurations

Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines

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Postfault Operation of Five-Phase Induction Machine With Minimum Total Losses Under Single Open-Phase Fault

Cited by 17 publications

References 37 publications

Study and Active Enhancement by Converter Reconfiguration of the Performance in Terms of Stator Copper Loss, Derating Factor and Converter Rating of Multiphase Drives Under Two Open Legs With Different Stator Winding Connections

Study and Active Enhancement by Converter Reconfiguration of the Performance in Terms of Stator Copper Loss, Derating Factor and Converter Rating of Multiphase Drives Under Two Open Legs With Different Stator Winding Connections

Assessment of Predictive Current Control of Six-Phase Induction Motor With Different Winding Configurations

Current Limitation Method for V / f Control of Five-Phase Induction Machines

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Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines