IGBT-Gating Failure Effect on a Fault-Tolerant Predictive Current-Controlled Five-Phase Induction Motor Drive

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: Fault Restrictionsmentioning

confidence: 99%

mentioning

confidence: 99%

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

González-Prieto

IEEE Trans. Power Electron.

Barrero

et al. 2017

Self Cite

“…If the leg-to-phase transformation is affected by the back-EMF of the faulty phase as in (6), ≠ * unless the disturbance caused by the neutral point oscillation in (4) is somehow compensated. If the modulation is chosen to be SVPWM [26], [27], the standard space vectors obtained from (3) are no longer valid and the use of pre-fault SVPWM techniques leads to erroneous voltages [28]. Alternatively, if carrier-based PWM is used, the modulation of leg voltages ( ) achieves = * but again IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS phase voltage references are not obtained ( ≠ * ).…”

Section: Features Of Pre-and Post-fault Five-phase Induction Motomentioning

confidence: 99%

Comparative Study of Predictive and Resonant Controllers in Fault-Tolerant Five-Phase Induction Motor Drives

Guzmán

IEEE Trans. Ind. Electron.

Barrero

et al. 2016

Self Cite

195

154

Abstract One of the most attractive features of multiphase machines is the fault-tolerant capability due to the higher number of phases. Different post-fault control strategies based on hysteresis, PI-resonant and predictive techniques have been recently proposed. They all proved their capabilities to withstand fault situations and to preserve the fundamental component of the air-gap field, while achieving minimum losses, maximum torque per-ampere and reducing torque vibrations. Nonetheless, due to their recent introduction, no thorough study has yet appeared comparing the performance of these controllers. In this paper two open-phase fault-tolerant control schemes are experimentally compared in a real five-phase induction machine. The controllers being compared are based on PI-resonant and predictive control techniques, respectively. The experiments include pre-and postfault situations. Obtained results show that both control methods offer nearly the same performance. When compared, predictive control provides faster control response and superior performance at low speed operation but is found to be less resilient to fault detection delays and to have higher current ripple. Regarding the controller implementation, it is shown that the transition from preto post-fault operation involves modelling the non-linear effects observed when an open-phase fault occurs for the predictive controller, and the proper retuning of the PI trackers for the PIresonant controller, in order to ensure post-fault operation.

“…When an n-phase machine is star connected and supplied by an n-phase converter, the open-circuit fault implies that the current can no longer flow through the faulted phase and the machine effectively has only n-1 phases located in an asymmetrical manner. In such situation, the fault needs to be firstly detected [14][15] and then several modifications need to be done to obtain satisfactory post-fault operation, including the recalculation of the current references [16][17], the derating of the drive [18] and the use of specific control schemes [19][20][21][22][23][24][25]. A great body of knowledge has been recently reported in this field for different numbers of phases, using various machine and converter types [12][13][14][15][16][17][18][19][20][21][22][23][24][25], but considering single n-phase supply in all cases.…”

Section: Introductionmentioning

confidence: 99%

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

González-Prieto

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.