Sensorless speed control of a five-phase induction machine under open-phase condition
- Author(s): Ahmed S. Morsy 1 ; Ayman S. Abdelkhalik 1 ; Shehab Ahmed 2 ; Ahmed Mohamed Massoud 3
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View affiliations
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Affiliations:
1:
Electrical Power and Machines Department , Faculty of Engineering , Alexandria University , Alexandria , Egypt ;
2: Electrical & Computer Engineering , Texas A&M University at Qatar , Doha 23874 , Qatar ;
3: Electrical Engineering Department , Qatar University , Doha , Qatar
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Affiliations:
1:
Electrical Power and Machines Department , Faculty of Engineering , Alexandria University , Alexandria , Egypt ;
- Source:
Volume 2014, Issue 5,
May
2014,
p.
201 – 209
DOI: 10.1049/joe.2014.0050 , Online ISSN 2051-3305
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.
Inspec keywords: sensorless machine control; machine vector control; model reference adaptive control systems; angular velocity control; induction motor drives; electric current control
Other keywords: optimal current control; field oriented control system; machine speed estimation; hysteresis current control; PR; objective functions; FOC; power 1 hp; prototype five-phase IM; multiple synchronous reference frame; open-phase condition; five-phase induction machine; multiphase induction machine; PR controllers; high-power safety-critical drive applications; sensorless speed control; IM drives; high switching frequency; adaptive proportional resonant current controllers; rotor flux-based MRAS speed estimator
Subjects: Self-adjusting control systems; Control of electric power systems; Velocity, acceleration and rotation control; Drives; Current control; Asynchronous machines
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