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Optimal Design of Brushless Doubly-Fed Induction Generator Considering Harmonic Effects for Maximizing Volumetric Power Density
, Ph.D. Dissertation Sharif University of Technology ; Oraee Mirzamani, Hashem (Supervisor)
Abstract
In recent decades, electricity generation using renewable energy sources especially wind has gained considerable attention worldwide. Various generating systems have been proposed for wind turbines to convert wind mechanical power into electrical power. Up to 70% of the installed wind turbines incorporate Doubly-Fed Induction Generator (DFIG) and a fractionally rated power converter. Other schemes still have technological and economic penalties such as high cost of active materials, complexity of machine manufacturing and control systems and large and expensive converter, which limit their spread in wind power plants. Among these, Brushless Doubly-Fed Induction Generator (BDFIG) has...
Electromagnetic-thermal design optimization of the brushless doubly fed induction generator
, Article IEEE Transactions on Industrial Electronics ; Vol. 61, issue. 4 , October , 2014 , PP. 1710-1721 ; ISSN: 02780046 ; Oraee, H ; McMahon, R. A ; Sharif University of Technology
Abstract
In view of its special features, the brushless doubly fed induction generator (BDFIG) shows high potentials to be employed as a variable-speed drive or wind generator. However, the machine suffers from low efficiency and power factor and also high level of noise and vibration due to spatial harmonics. These harmonics arise mainly from rotor winding configuration, slotting effects, and saturation. In this paper, analytical equations are derived for spatial harmonics and their effects on leakage flux, additional loss, noise, and vibration. Using the derived equations and an electromagnetic-thermal model, a simple design procedure is presented, while the design variables are selected based on...
A novel rotor configuration for brushless doubly-fed induction generators
, Article IET Electric Power Applications ; Volume 7, Issue 2 , 2013 , Pages 106-115 ; 17518660 (ISSN) ; Jandaghi, B ; Oraee, H ; Sharif University of Technology
2013
Abstract
Brushless Doubly-Fed Induction Generator has attractive features to be the first choice in next generation of wind generators. However, its efficiency and power-to-weight ratio are slightly lower in comparison to induction machine with the same rating. Considerable part of these imperfections arises from the rotor design, which produces magnetic field with considerable undesirable spatial harmonics. This paper proposes a novel rotor configuration to reduce spatial harmonic distortion of air-gap magnetic field as well as improving some drawbacks of the conventional structure, including unequal magnitudes of rotor bar currents, teeth saturation at low average air gap magnetic fields, high core...