Analytical Approach to Maximum Power Tracking and Loss Minimization of a Doubly-Fed Induction Generator
Date Issued
2011
Date
2011
Author(s)
Chen, Bo-An
Abstract
Maximum power tracking and loss minimization of a doubly-fed induction generator (DFIG) are studied in this thesis to yield maximum output power. Analytical solutions for rotor currents are derived for steady-state equivalent circuits with and without core loss. Stator resistance is considered in all the derivations.
Stator-flux orientated control is first introduced to achieve decoupled real and reactive power control. Then the way to achieve maximum power tracking under different wind speeds is described. Finally, analytical solutions for rotor currents to achieve both maximum power tracking and minimum loss are derived. Furthermore, detailed expressions for stator power, rotor power, copper loss, core loss and generator output power are derived. Finally, with a small generator as an example, computational results are given to demonstrate the effectiveness of theoretical analysis.
Results for a DFIG without core loss from the proposed analytical approach and those from exhaustic search method in a former study are first compared. Then the results from the analytical approach with and without considering core loss are compared. Finally, the real and reactive output powers under different stator voltage are presented.
Subjects
Wind energy generation
doubly-fed induction generator
distribution system
maximum power tracking
loss minimization
maximum power output
core loss
Type
thesis
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