Design of a current controller for symmetrical six‐phase fault‐tolerant PMSM under fault conditions

Abstract

To achieve the fault-tolerant operation of motor drives, many control algorithms have been proposed. Among them, it is more flexible and intuitive to find solutions to phase current at phase coordinate. Then it is necessary to track the given phase current. Up to now, several current controllers have been proposed. A hysteresis controller suffers from the drawback of the variable switching frequency. Proportional-integral control cannot track ac signals with zero error. As to the proportional resonant controller, its performance is highly dependent on the accuracy of motor speed detection. Considering this, a current controller is based on the adaptive filter. The adaptive filer is worked as the current controller by adjusting its structure, in which the motor model is extra introduced. The controller updates the tap weight in each control cycle until it outputs the optimal voltage to track the given phase current. Besides, the adaptive algorithm is improved by adding a feedforward term to gain a higher dynamic response. Moreover, to ensure the stability of the controller, the control parameter selection principles are analysed and acquired accordingly. Finally, several groups of experiments are conducted. The experiment results coincide with the analysis.

Nonlinear optimal control for VSI-fed six-phase PMSMs in the traction of electric vehicles

“…It has been also aimed to generalize the use of such nonlinear control methods to more types of electric motors (asynchronous, brushless DC or reluctance motors) and to the associated power electronics (converters, inverters) [30][31]. Due to the potential for use in industrial applications and in electric traction and propulsion systems there is ongoing research on nonlinear control for VSI-fed 6-phase PMSMs [32][33][34]. Among these results, predictive control techniques remain a dominant direction [35][36][37][38].…”

Modified indirect rotor field‐oriented control strategies for wye‐connected three‐phase induction motor drives under an open‐phase fault

“…These applications require a faulttolerant control (FTC) technique whereby the drive system performance cannot be disrupted by the faulty condition mainly for safety and economic reasons. In these applications the drive system should sustain its minimum operating performance [4][5][6].…”