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Modeling and Analysis of Doubly Fed Induction Generator Wind Energy Systems by Zhixin Miao, Lingling Fan

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Chapter 4

Analysis of DFIG with Unbalanced Stator Voltage

Abstract

This chapter focuses on steady-state analysis and dynamic analysis of the effect of asymmetric stator voltage dip on the stator/rotor currents as well as the electromagnetic torque of a doubly fed induction generator. Positive- and negative-sequence circuits of an induction machine are employed to carry out steady-state circuit analysis. Further, electromagnetic torque calculation is carried out. To examine the transient, we again use the space-vector model developed in Chapter 2. While in Example 2 in Chapter 2, only positive-sequence space vector is considered, this time, the negative-sequence space vector is in the picture. Mitigation control using coordinated rotor-side converter ...

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