Research on the Control Strategy of DFIG Grid Side Converter under Unbalanced Grid Voltage Conditions

Abstract:

This paper studies on the electromagnetic transient model of doubly-fed wind turbine grid-side converter under the imbalanced grid condition. And on this basis, the paper analysis the impact of doubly-fed converter when grid voltage asymmetric drop. It puts forward a dual PLL and dual current control combination of doubly-fed converter grid side control strategy. This strategy achieves grid voltage positive and negative sequence fast separation when asymmetric grid voltage drop occur, achieves the active output power secondary fluctuate suppression under the imbalanced grid voltage condition, avoids DC voltage rise at the fault moment and also achieves converter reactive power support under the imbalanced grid fault. The simulation and experimental results show that the proposed control strategy is correct and with the application value of engineering

• Periodical: Applied Mechanics and Materials (Volumes 260-261)
• Pages: 454-459
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.260-261.454
• Online since: December 2012
• Authors: Fei Song, Dan Zhu, Kan Tang, Xue Jing Liu
• Keywords: Doubly-Fed Converter, Dual Current Control, Dual PLL, Grid Imbalanced

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