DocumentCode :
1341162
Title :
Harmonic Analysis of a DFIG for a Wind Energy Conversion System
Author :
Fan, Lingling ; Yuvarajan, Subbaraya ; Kavasseri, Rajesh
Author_Institution :
Univ. of South Florida, Tampa, FL, USA
Volume :
25
Issue :
1
fYear :
2010
fDate :
3/1/2010 12:00:00 AM
Firstpage :
181
Lastpage :
190
Abstract :
This paper develops a framework for analysis of harmonics in a doubly fed induction generator (DFIG) caused by nonsinusoidal conditions in rotor and unbalance in stator. Nonsinusoidal rotor voltages are decomposed into harmonic components and their corresponding sequences are identified. Induced harmonics in stator are analyzed and computed, from which the torques produced by these interactions between stator and rotor harmonic components can be found. During unbalanced stator conditions, symmetric component theory is applied to the stator voltage to get positive-, negative-, and zero-sequence components of stator and rotor currents. The steady-state negative-sequence equivalent circuit for a DFIG is derived based on the reference frame theory. Harmonic currents in the rotor are computed based on the sequence circuits. In both scenarios, the harmonic components of the electromagnetic torque are calculated from the interactions of the harmonic components of the stator and rotor currents. Three case studies are considered, namely: 1) nonsinusoidal rotor injection; 2) an isolated unbalanced stator load scenario; and 3) unbalanced grid-connected operation. The analysis is verified with results from numerical simulations in Matlab/Simulink. For illustration, the second case is verified using experiments. The simulation results and experimental results agree well with the results from analysis.
Keywords :
asynchronous generators; direct energy conversion; equivalent circuits; harmonic analysis; machine theory; wind power plants; DFIG; Matlab-Simulink; doubly fed induction generator; electromagnetic torque; harmonic component decomposition; harmonic currents; isolated unbalanced stator load scenario; negative sequence components; nonsinusoidal rotor injection; nonsinusoidal rotor voltages; numerical simulations; positive sequence components; reference frame theory; rotor currents; sequence circuits; stator currents; stator induced harmonic analysis; steady-state negative-sequence equivalent circuit; symmetric component theory; unbalanced grid-connected operation; wind energy conversion system; zero sequence components; Doubly fed induction generator (DFIG); harmonics; inverter; unbalance; wind generation;
fLanguage :
English
Journal_Title :
Energy Conversion, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8969
Type :
jour
DOI :
10.1109/TEC.2009.2032594
Filename :
5340615
Link To Document :
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