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Control of a Doubly Fed Induction Generator via an Indirect Matrix Converter With Changing DC Voltage

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5 Author(s)
Pena, R. ; Dept. of Electr. Eng., Univ. of Concepcion, Concepcion, Chile ; Cardenas, R. ; Reyes, E. ; Clare, J.
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This paper presents a control strategy for a doubly fed induction generator (DFIG) using an indirect matrix converter, which consists of an input side matrix converter and an output side voltage source converter (VSC). The capability of the input converter to generate different “virtual dc link” voltage levels is exploited. The commutation of the VSI with reduced voltage is illustrated for operating points where the output voltage demand is low without any deterioration of the current control performance. The proposed method leads to a reduction in the commutation losses in the output converter and reduced common-mode voltage. For the input converter, soft switching commutation is obtained by synchronizing the input and output converter pulsewidth-modulation patterns. This modulation strategy is particularly applicable in DFIG applications because the required rotor voltage decreases when the DFIG speed is close to the synchronous speed. The complete control strategy is experimentally validated using a 2-kW rig.

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Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 10 )