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http://dx.doi.org/10.5370/JEET.2010.5.3.371

D-q Equivalent Circuit-based Protection Algorithm for a Doubly-fed Induction Generator in the Time Domain  

Kang, Yong-Cheol (Dep. of Electrical Engineering, Chonbuk National University)
Kang, Hae-Gweon (Dep. of Electrical Engineering, Chonbuk National University)
Lee, Ji-Hoon (Dep. of Electrical Engineering, Chonbuk National University)
Publication Information
Journal of Electrical Engineering and Technology / v.5, no.3, 2010 , pp. 371-378 More about this Journal
Abstract
Most modern wind turbines employ a doubly-fed induction generator (DFIG) system due to its many advantages, such as variable speed operation, relatively high efficiency, and small converter size. The DFIG system uses a wound rotor induction machine so that the magnetizing current of the generator can be fed from both the stator and the rotor. We propose a protection algorithm for a DFIG based on a d-q equivalent circuit in the time domain. In the DFIG, the voltages and currents of the rotor side and the stator side are available. The proposed algorithm estimates the instantaneous induced voltages of magnetizing inductance using those voltages and currents from both the stator and the rotor sides. If the difference between the two estimated induced voltages exceeds the threshold, the proposed algorithm detects an internal fault. The performance of the proposed algorithm is verified under various operating and fault conditions using a PSCAD/EMTDC simulator.
Keywords
Doubly-fed induction generator; D-q equivalent circuit; Turn-to-turn fault; Protection algorithm;
Citations & Related Records

Times Cited By SCOPUS : 4
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