Sensorless speed control of a five-phase induction machine under open-phase condition

The Journal of Engineering

Ahmed Mohamed Massoud¹  Shehab Ahmed²  Ayman S. Abdelkhalik⁴  Ahmed S. Morsy⁴ 

[1] Computer Engineering, Texas A&Electrical &Electrical Engineering Department, Qatar University, Doha, Qatar;Electrical Power and Machines Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt;M University at Qatar, Doha 23874, Qatar

关键词: 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;   

DOI  :  10.1049/joe.2014.0050

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

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.

【 授权许可】

CC BY