Abstract
Recently, multiphase machines have been promoted as competitors to their three-phase counterparts in high-power safety-critical drive applications. Among numerous advantages of multiphase induction machine (IM) drives, self-starting and operation under open phase(s) stand as the most salient features. With open phase(s), optimal current control provides disturbance- free operation given a set of objective functions. Although hysteresis current control was merely employed in the literature as it offers a simple controller structure to control the remaining healthy phases, it is not suitable for high-power applications. In the literature, multiple synchronous reference frame (dq) control can be an alternative; however, it requires back and forth transformations with several calculations and additional sophistication. In this paper, a simple technique employing adaptive proportional resonant (PR) current controllers is presented to control a five-phase IM under open-phase conditions. Results for both volt/hertz (V/f) and field oriented control (FOC) systems are presented. Moreover, sensorless operation under fault condition is also demonstrated by estimating the machine speed using a rotor flux-based model reference adaptive system (MRAS) speed estimator. The proposed controllers are experimentally verified and compared. Although FOC provides better dynamic performance, V/f control offers a simpler control structure and a lower number of PR controllers.
Highlights
In high power and safety-critical applications, multiphase induction motors (IMs) are strong competitors to their three-phase counterparts based on the numerous advantages offered by multiphase systems [1]
The system is run by powering the DC machine up to the rated speed measuring its current to estimate the copper losses, mechanical losses can be found as the difference between the DC input power and the copper losses of the DC machine
Two simple sensorless fault tolerant control schemes based on conventional V/f control and field oriented control (FOC) control of a five-phase IM are presented
Summary
In high power and safety-critical applications, multiphase induction motors (IMs) are strong competitors to their three-phase counterparts based on the numerous advantages offered by multiphase systems [1]. Multiphase systems offer additional degrees of freedom that improve system performance, increase system fault tolerant capability and enhance machine power density using harmonic current injection [1,2,3]. Among these vast features, fault tolerant capability is recognised as the most salient feature of multiphase systems. Multiphase machine performance with open circuited phases has been addressed in the literature [4, 5] to a large extent, and control strategies to ensure disturbance-free operation with the same pre-fault magneto-motive force have been demonstrated
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