Study on Brushless Doubly-Fed Machine during Network Unbalanced Conditions and Present Compensating Approaches

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Sotoodeh, Pedram | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40889 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Oraee Mirzamani, Hashem
Abstract:
The Brushless Doubly-Fed Machine (BDFM) is a new kind of doubly-fed machines which incorporates the robustness of the squirrel cage induction machine and the speed and power factor control of a synchronous machine. All of these advantages are obtained from a relatively low rating power electronic converter. The stator of a BDFM is furnished with two balanced three phase windings of conventional design. At this thesis the effects of an unbalanced grid on the operation of a BDFM has been studied. A balanced grid contains three phases with the same amplitude and the phase angle of 120 degrees between each two phases. The unbalanced grid is defined by any turbulent grid. There are some kinds of unbalanced grid conditions such as changing the amplitude of one phase, changing in the amplitude of two phases, changing the phase angle between phases, and so on. In this thesis some kinds of these disturbances have been studied. The dq model of BDFM during unbalanced grid conditions has been extracted. At the end of the thesis, simulation results have been provided.
Keywords:
Brushless Doubly Fed Machine (BDFM) ; DQ Model ; Unbalanced Grid

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