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Significance Statement
This work discusses the effects and performance of internal and external disturbances for a hybrid fuzzy-fuzzy controller (HFFC) scheme to accordingly modify the speed of an induction motor. The hybrid fuzzy-fuzzy controller has been proven to be more effective as compared to a scalar controller due to the utilization of the two aspects of the field-oriented control (FOC). Besides, one of the key advantages of this controller includes the supply of same field oriented control and frequency which is unresponsive to the parameter variation in the motor and system strength to noise and load disturbances. The field oriented control has two features that make the control complicated. Firstly, it is not able to control frequency directly, due to the fact that the supply frequency does change during the period of accelerate-decelerate for the field-oriented controller, whilst the slip frequency remains the same. Secondly, in the presence of a torque command the magnitude of a supply current magnitude has to remain stable.
The implementation of a fuzzy current amplitude controller on the induction motor model makes this work unique. This controller possesses same supply features as the field oriented control and insensitivity to the parameters variation of the motor and system robustness to noise and load disturbances is one of the advantages of this controller. Generally, by using simple solutions, fuzzy systems are capable of managing non-linear, complicated and at times, mathematically intangible dynamic systems. Though, it is not an easy task to get an optimal set of fuzzy membership rules and functions, the designer needs to invest time and applies skills and experience for the tiresome fuzzy tuning exercise. Even though an iterative and heuristic process for transforming the membership functions to enhance performance has been recommended, but in principle, there is no common method or rule for the fuzzy logic set-up, but it depends on requirements.
This study under the dynamic settings produces quite a comprehensive evaluation and analysis of the controller. The experimental results verify the performance of the proposed HFFC in controlling of induction motors variable speed drive.
Energy Procedia, Volume 75, 2015, Pages 1529-1535.
Muawia A. Magzoub, Nordin B. Saad, Rosdiazli B. Ibrahim.
Universiti Teknologi PETRONAS, Department of Electrical and Electronics Engineering, 32610 Bandar Sri Iskandar, Malaysia
Abstract
Induction motor (IM) variable speed drive efficiency is essential for a few reasons as energy conservation, economic saving and lessening of ecological contamination. This research represents a study of the efficiency improvement for the developed hybrid fuzzy-fuzzy controller (HFFC) scheme to gain control over the speed of an induction motor’s variable speed drive (VSD). In order to overcome drawback of field oriented control (FOC) method, the principle of hybrid fuzzy-fuzzy controller is based on set of rules to control speed of a rotor by utilizing fuzzy frequency controller during the accelerate-decelerate stage. Alternatively, a fuzzy stator current magnitude controller is used during steady-state stage. The two aspects (current and frequency) of field oriented control are engaged to design a scalar controller. The performance of the controller is observed by conducting a series of tests, and it can be concluded that the controller is efficient, reliable and insensitive towards the parameter variation in the system and motor robustness to load and noise disturbances.
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