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The FLC is developed in MATLAB using Fuzzy logic toolbox. 2. VECTOR CONTROL OF INDUCTION MOTOR. Induction motor speed control methods are varied.
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AbstractâThis paper proposes two complex vector models to characterize unbalanced three-phase four-wire systems that contain pulsewidth-modulated ...
Jul 8, 2014 - power converter, the voltage control, and the electrical grid. The power converter is a three-phase three-wire voltage-source in- verter.
Control of Vector Discrete-Event Systems. I-The Base Model. Yong Li, Member, IEEE, and W. M. Wonham, Fellow, IEEE. Abstract-A vector discrete-event system ...
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Dec 14, 2012 - phase SSMR experiences a fault, it can continue to supply power ... uses the auxiliary resonant branches connected to the original power ...
Jun 18, 2012 - Abstract. Vector borne diseases (VBD) are on the rise because of failure of the existing methods of control of vector and vector borne diseases ...
For music signal processing, compared with the strategy which models each short-time frame independently, when the long-time features are considered, the ...
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Jan 22, 2014 - This paper presents a simplified and supervised i-vector modeling approach with applications to .... SV domains due to its excellent performance, low complexity and small model size (Dehak ...... tutorial and user manual.
aplikasi tertentu seperti dalam ketenteraan dan eksplorasi angkasa lepas di mana operasi harus diteruskan walaupun kerosakan telah berlaku pada motor.
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MODELING AND VECTOR CONTROL OF THREE-PHASE INDUCTION MOTOR WHEN TWO PHASES OF THE STATOR ARE OPEN CIRCUIT
SEYEDHESAM ASGARI
A project report submitted in partial fulfilment of the requirements for the award from the degree of Master of Engineering (Electrical-Power)
Faculty of Electrical Engineering Universiti Teknologi Malaysia
JUNE 2014
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To my beloved family and specially my dears father and mother
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ACKNOWLEDGEMENT
Firstly, I am thankful to God to complete this master project successfully. This project could not have been written without help of my supervisor, Assoc. Prof. Dr. Nik Rumzi bin Nik Idris who encouraged and challenged me through my academic program. I would like to express my special gratitude and thanks to my dears father and mother for their kindness, patience and support me, and to my brothers, Meisam and Farid for encouraging me through thick and thin. Without all of you I will not be able to stand where I am today. Special thanks to my friends Mohammad Jannati and Mohammad Ali Sahraei for their help and view at various occasions. Also I would like to express my appreciation to those who have given me either direct or indirect assistance in this project. Eventually, I hope that this report will be advantageous in the future.
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ABSTRACT
Variable Frequency Drives (VFDs) are used to provide reliable dynamic systems and significant reduction in usage of energy and costs of the induction motors. Over the past decades, many control techniques have been proposed for induction motors drive system. One of the most well-known control method for controlling the speed and torque of the induction motor is Field-Oriented Control (FOC) technique. Modeling and control of faulty or an unbalanced three-phase induction motor (two stator phases open-circuit) is obviously different from healthy three-phase induction motor. Using conventional FOC for faulty three-phase induction motor, results in a significant torque and speed oscillation under fault conditions. Modeling and vector control of a faulty three-phase induction motor is extremely important in some critical applications, such as traction drive in military and space explorations, to ensure fault-tolerant operations. This research presented a new method for modeling and control of three-phase induction motor under fault condition (two-phase open circuit fault). The proposed method for modeling and vector control of faulty induction motor are based on d-q and Rotor FOC (RFOC) methods. It is shown the d-q model of faulty three-phase induction motor has the same structure of equations as the balanced three-phase induction motor. Therefore, by using some modifications to the conventional controller such as FOC, a novel technique for three-phase induction motor with two stator phases open-circuit (faulty three-phase induction motor) has been developed. A comparison between conventional and modified controller showed that the modified controller has been significantly reduced the torque and speed oscillations.
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ABSTRAK
Pemacu frekuensi boleh-ubah digunakan untuk memberi sambutan dinamik yang mantap serta mengurangkan penggunaan tenaga dalam motor aruhan. Untuk beberapa dekad yang lepas, banyak kaedah kawalan motor aruhan telah diperkenalkan. Salah satu kaedah yang paling popular untuk pengawalan laju dan dayakilas ialah kawalan medan-berorientasi (Field-oriented Control (FOC)). Kawalan dan permodelan untuk motor rosak (dua fasa terputus) atau motor 3-fasa yang tidak seimbang sudah pastinya berlainan dari kaedah kawalan dan permodelan untuk motor 3-fasa yang sihat. Menggunakan kaedah kawalan FOC sedia ada untuk motor-motor ini akan menyebabkan ayunan yang tinggi dalam sambutan dayakilas dan laju motor. Permodelan dan kawalan untuk motor rosak adalah penting untuk aplikasi tertentu seperti dalam ketenteraan dan eksplorasi angkasa lepas di mana operasi harus diteruskan walaupun kerosakan telah berlaku pada motor. Penyelidikan dalam tesis ini membentangkan kaedah baru dalam permodelan dan kawalan FOC untuk motor aruhan 3-fasa yang mana dua dari fasanya adalah terbuka. Kaedah yang digunakan adalah berasaskan kepada permodelan d-q dan fluks rotor FOC. Ditunjukkan dalam tesis ini permodelan d-q untuk motor rosak mempunyai bentuk persamaan yang sama dengan motor yang sihat. Dengan membuat sedikit ubah suai keatas FOC sedia ada, kawalan untuk motor rosak (dua fasa terbuka) telah dapat dihasilkan. Perbandinagn di antara kawalan kaedah lama dan baru menunjukkan kaedah baru dapat mengurangkan ayunan pada dayakilas dan laju dengan baik.
