Improvement of DFIG Under Unbalanced Voltage Condition

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Karimi Khouzani, Hadi | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40438 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Parniani, Mostafa
Abstract:
In this thesis, performance of doubly fed induction generators in wind turbine, under stator unbalanced voltage condition has been studied. Therefore, beside of presenting related equations and models for DFIG, drawbacks of DFIG performance under unbalanced voltage condition on variables such as electric torque, active and reactive stator power and stator current have been shown. Then, controller have been designed in the way that can eliminate electric torque oscillation, active power oscillation, negative sequences of stator current and rotor current. The controller is designed base on decoupling sequences in synchronous reference and stator voltage orientation method(SVO) that consist of both negative and positive sequence controller. The positive sequence controller performs only in unbalance condition, in spite of negative one that performs in unbalance condition. The negative controller targets are to control negative sequences and second harmoniccomponent of deferent system variables
Keywords:
Wind Energy ; Doubly Fed Induction Generator (DFIG) ; Internal Model Control (IMC) ; Unbalanced Condition Voltage

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