Single-Index Open-Phase Fault Detection Method for Six-Phase Electric Drives

Garcia-Entrambasaguas, Paula; González-Prieto, Ignacio; Durán, Mario J.

doi:10.1109/tie.2019.2962407

Cited by 26 publications

(18 citation statements)

References 28 publications

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“…However, only the scenario of a single OCL was taken into account [8]. Nevertheless, often two phases/legs instead of one become faulty, and hence such situation should also be considered [7], [9], [17], [20], [21], [26], [30], [31], [34], [35], [37], [41].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Even though the natural fault-tolerant control avoids stages 2 and 3, it is still necessary to detect the fault and identify the fault scenario (stage 1) in order to derate the drive (stage 4) and safeguard the drive integrity [11]. The next section reveals how to get rid of these remaining stages, so that the fault-tolerant control becomes fully automatic.…”

Section: Natural Fault-tolerant Indirect Rotor Field Oriented Controlmentioning

confidence: 99%

“…Although the higher simplicity of the natural approach was a tipping point in the design of fault-tolerant regulation strategies for multiphase drives, stages one and four were still mandatory to protect the machine and converter from eventual over-currents. Since the derating of the drive does not require the knowledge of the specific phases under OPF, a simplified version of stage one was suggested in [11]. However, the determination of the fault scenario and the subsequent derating were still required [11].…”

Section: Introductionmentioning

confidence: 99%

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Automatic Fault-Tolerant Control of Multiphase Induction Machines: A Game Changer

et al. 2020

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Until very recently, the fault tolerance in multiphase electric drives could only be achieved after fault localization and a subsequent modification of the control scheme. This scenario was profoundly shaken with the appearance of the natural fault tolerance, as the control reconfiguration was not required anymore. Even though the control strategy was highly simplified, it was still necessary to detect the open-phase fault (OPF) in order to derate the electric drive and safeguard its integrity. This work goes one step beyond and suggests the use of an automatic fault-tolerant control (AFTC) that also avoids the detection of the OPF. The AFTC combines the natural fault-tolerant capability with a self-derating technique, finally obtaining a hardware-free software-free fault tolerance. This achievement changes completely the rules of the game in the design of fault-tolerant drives, easing at the same time their industrial application. Experimental results confirm in a six-phase induction motor (IM) drive that the proposed AFTC provides a simple and safe manner to add further reliability to multiphase electric drives.

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“…A proposed idea of a passive or natural fault tolerance has been presented in [10][11][12][13]. It is demonstrated that it is possible to develop a drive control algorithm which should not be re-configured after a fault occurs (i.e., the current reference values will be automatically adjusted in the post-fault operation mode).…”

Section: Introductionmentioning

confidence: 99%

Applicability Analysis of Indices-Based Fault Detection Technique of Six-Phase Induction Motor

et al. 2021

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The multiphase induction motor is considered to be the promising alternative to the conventional three-phase induction motor, especially in safety-critical applications because of its inherent fault-tolerant feature. Therefore, the attention of many researchers has been paid to develop different techniques for detecting various fault types of multiphase induction motors, to securely switch the control mode of the multiphase drive system to its post-fault operation mode. Therefore, several fault detection methods have been researched and adapted; one of these methods is the indices-based fault detection technique. This technique was firstly introduced to detect open-phase fault of multiphase induction motors. The main advantage of this technique is that its mathematical formulation is straightforward and can easily be understood and implemented. In this paper, the study of the indices-based fault detection technique has been extended to test its applicability in detecting some other stator and rotor fault types of multiphase induction motors, namely, open-phase, open-switch, bad connection and broken rotor bar faults. Experimental and simulation validations of this technique are also introduced using a 1 kW prototype symmetrical six-phase induction motor.

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Single-Index Open-Phase Fault Detection Method for Six-Phase Electric Drives

Cited by 26 publications

References 28 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

Automatic Fault-Tolerant Control of Multiphase Induction Machines: A Game Changer

Applicability Analysis of Indices-Based Fault Detection Technique of Six-Phase Induction Motor

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