Parameter Identification of Multiphase Induction Machines With Distributed Windings—Part 1: Sinusoidal Excitation Methods

IEEE Trans. Power Electron.

Barrero

et al. 2017

Self Cite

Abstract-The redundancy of multiphase drives provides an inherent fault-tolerant capability that is appreciated in applications with a complicated corrective maintenance or safety-critical requirements. Fault restrictions however force the system to be reconfigured to operate in a smooth and efficient manner. Previous works have been focused on the optimization of current waveforms to generate an undisturbed operation but still maintaining the pre-fault rated flux settings. This work shows that efficient controllers can improve the post-fault performance in six-phase induction machines supplied by parallelconnected converters if offline optimization is used to obtain a variable reference flux. Theoretical and experimental results confirm that the proposed flux adaptation method provides higher torque/power capability, lower degree of imbalance in the current sharing between windings and efficiency improvement.

Section: A Test Benchmentioning

confidence: 99%

Impact of Postfault Flux Adaptation on Six-Phase Induction Motor Drives With Parallel Converters

IEEE Trans. Power Electron.

Barrero

et al. 2017

Self Cite

“…The six-phase drive consists of an asymmetrical six-phase induction machine driven by conventional two-level three-phase VSCs from Semikron (SKS22F modules). Ac-time domain and stand-still with inverter supply tests [26][27] have been used to determine the parameters of the custom-built multiphase machine. Table I shows the induction motor drive parameters and rated values.…”

Section: A Test Benchmentioning

confidence: 99%

A Simple Braking Method for Six-Phase Induction Motor Drives With Unidirectional Power Flow in the Base-Speed Region

IEEE Trans. Ind. Electron.

Barrero

et al. 2017

Self Cite

Abstract-Induction motor drives supplied from diode front-end rectifiers are commonly used in industrial applications due to their low cost and reliability. However, the two-quadrant operation of such a topology makes the regenerative braking impossible. Braking resistors can be used to dissipate the braking power and provide enhanced braking capability, but additional hardware is then necessary. Alternatively, the braking power can be dissipated within the inverter/motor by control software reconfiguration. In this scenario, the additional degrees of freedom of multiphase drives can be used to increase the system losses without disturbing the flux and torque production. Experimental results confirm the possibility to enhance the braking capability of six-phase drives with only few changes in the control scheme.Index Terms-Multiphase induction motor drives, braking methods, field oriented control.

“…3. Parameters of the custom-built six-phase machine have been determined using conventional, AC-time domain and stand-still tests with inverter supply [37][38], providing stator and rotor resistances of 4.2 and 2 , stator and rotor leakage inductances of 4.2 and 55 mH, and mutual inductance of 420 mH. The six-phase machine is driven by conventional three-phase power converters from Semikron (SKS22F modules) that correspond to VSCs1 and VSCs2 in Fig.…”

Section: A Test Benchmentioning

confidence: 99%

Fault-Tolerant Operation of Six-Phase Energy Conversion Systems With Parallel Machine-Side Converters

IEEE Trans. Power Electron.

Seng

et al. 2016

Self Cite

Abstract The fault tolerance provided by multiphase machines is one of the most attractive features for industry applications where a high degree of reliability is required. Aiming to take advantage of such post-fault operating capability, some newly designed full-power energy conversion systems are selecting machines with more than three phases. Although the use of parallel converters is usual in high-power three-phase electrical drives, the fault tolerance of multiphase machines has been mainly considered with single supply from a multiphase converter. This work addresses the faulttolerant capability of six-phase energy conversion systems supplied with parallel converters, deriving the current references and control strategy that need to be utilized to maximize torque/power production. Experimental results show that it is possible to increase the post-fault rating of the system if some degree of imbalance in the current sharing between the two sets of three-phase windings is permitted.Index Terms Multiphase energy conversion systems, fault tolerance, parallel converters, field oriented control.