Modeling and Control of a Cascaded Doubly Fed Induction Generator Dedicated to Isolated Grids
Patin, N.; Monmasson, E.; Louis, J.-P.
Industrial Electronics, IEEE Transactions on
Volume 56, Issue 10, Oct. 2009 Page(s):4207 - 4219
Digital Object Identifier   10.1109/TIE.2009.2028358
Summary: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.

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