Improved Grid Connection Operation of Type-III Wind Turbine Under Unbalanced Fundamental and Distorted Grid Voltages

The paper presents the improved control strategy of balanced and sinusoidal doubly fed induction generator (DFIG) stator current with repetitive control (RC) under grid voltage unbalanced fundamental (the grid voltage fundamental negative component) and unbalanced harmonic distortion (all the harmon...

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Bibliographic Details
Published inIET Conference Proceedings
Main Authors Heng Nian, Cheng, Chenwen
Format Conference Proceeding
LanguageEnglish
Published Stevenage The Institution of Engineering & Technology 08.11.2015
Subjects
Electric potential
Harmonic distortion
Induction generators
Repetitive control
Sequences
Stators
Strategy
Unbalance
Voltage
Wind turbines
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Summary:The paper presents the improved control strategy of balanced and sinusoidal doubly fed induction generator (DFIG) stator current with repetitive control (RC) under grid voltage unbalanced fundamental (the grid voltage fundamental negative component) and unbalanced harmonic distortion (all the harmonic distortion components contain positive and negative sequence). The proposed strategy aims at ensuring balanced and sinusoidal DFIG stator current injected into the power grid. The mathematical modeling of DFIG under unbalanced fundamental and distorted grid voltage is theoretically analyzed, and the repetitive control (RC) regulator is tuned at the multiple of control frequency 100Hz to remove the stator current unbalanced fundamental and distorted sequences. Finally, the availability of the proposed RC strategy is verified by experiment results.
ISBN:1849199841
9781849199841
DOI:10.1049/ic.2015.0230