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Modeling and Control of a Cascaded Doubly Fed Induction Generator Dedicated to Isolated Grids

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3 Author(s)
Nicolas Patin ; Lab. d'Electromec., Univ. of Technol. of Compiegne, Compiegne, France ; Eric Monmasson ; Jean-Paul Louis

This paper deals with the control of an autonomous cascaded doubly fed induction generator (CDFIG) operating in a variable speed constant frequency (VSCF) mode. The proposed structure is a full stand-alone generating system dedicated to isolated grids for embedded systems such as aircraft or small-scale renewable-energy systems such as microhydropower generators. Compared to a traditional VSCF system based on a single DFIG, CDFIG allows suppressing brushes, leading to an easier maintenance. However, the main difficulty when working with such a structure is its inherent complexity. The major issue is to synthesize an efficient global-control strategy for these two strongly connected machines. To overcome this problem, a modeling methodology based on dynamical equivalent circuits is given in this paper for the design of the CDFIG controller. Presented simulations and experimental results validate the proposed design approach.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:56 ,  Issue: 10 )