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Improve the Direct Torque Control Method for Brushless Doubly Fed Induction Machines
, M.Sc. Thesis Sharif University of Technology ; Oraee Mirzamani, Hashem (Supervisor) ; Barati, Farhad (Co-Advisor)
Abstract
The Brushless Doubly Fed Induction Machine (BDFIM) has the potential to be used as a generator or motor in adjustable speed variables. But the most important application for the BDFM is to work as a wind generator. Due to this ability it can be considered as a rival for the Doubly Fed Induction Generator (DFIG) that is the most common type of the wind power generators nowadays. Because of problems of relater to brushes in DFIG, the BDFM has more resisted structure compared to the DFIG. Thanks to the special “nested loop” structure of rotor and two different coils on the stator without direct coupling between them, three different operation modes are possible for the BDFM.The synchronous...
Optimal Design and Control of Brushless Doubly Fed Machines
, M.Sc. Thesis Sharif University of Technology ; Oraee Mirzamani, Hashem (Supervisor) ; Barati, Farhad (Supervisor)
Abstract
Doubly fed machines require lower converter rating in comparison to single fed machines, and this is the most important advantage of doubly fed machines. Among them, Brushless Doubly Fed Machines (BDFMs) have some advantages, including higher reliability and longer maintenance period. Determination of the converter rating is an important issue that has been not sufficiently investigated. Determination of the minimum converter rating, or in other words, converter current and voltage, in order to minimize the cost to commercialize the BDFM is mandatory. In this thesis, the problem is presented properly, and the optimal voltage and current of each machine side and grid side converters are...