The Transient Characteristics Analysis of Doubly-Fed Induction Generator during the Asymmetric Voltage Sag

Abstract:

In order to analyze the control strategy of the low voltage ride through (LVRT) of DFIG during the asymmetric voltage sag, it is necessary to analyze the transient performance of a DFIG during the asymmetric voltage sag. In this paper, analyzed the influence of the asymmetric grid voltage to DFIG and the analysis method of the asymmetric voltage sag, and on the basis of positive and negative sequence mathematical model, analyzed the composition of stator output active and reactive power under the condition of asymmetric grid voltage. And built a DFIG asymmetric voltage drop simulation model of 1.5MW in MATLAB/Simulink, the simulation results shows that the stator voltage, current, active power and reactive power all present a double frequency ripple during the asymmetric voltage sag, consistent with theoretical analysis. It can provide theoretical basis for double-fed motor control strategy of asymmetric LVRT.

• Periodical: Applied Mechanics and Materials (Volumes 644-650)
• Pages: 3509-3514
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.644-650.3509
• Online since: September 2014
• Authors: Jian Hua Zhang*, Hao Ran Shen, Lei Ding, Chun Lei Dai
• Keywords: Asymmetric Voltage Sag, Doubly Fed Generator, Mathematical Models, Wind Energy Generation

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