Các anh down giúp cho em các bài báo này:
1. Analysis of faulted power systems in three phase coordinates - a generic approach
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http://ieeexplore.ieee.org/xpl/freea...isnumber=34152
2. Voltage sag analysis using an Electromagnetic Transients Program
http://ieeexplore.ieee.org/xpl/freea...isnumber=21229
3.Different methods for classification of three-phase unbalanced voltage dips due to faults,
Electric Power Systems Research
Cảm ơn.