Variable speed and constant frequency (VSCF) generators are widely used in industry (e.g. embedded applications andrenewable energy systems). Doubly-fed induction generators (DFIG) allow a such operation. Moreover,this kind ofmachines can be driven by a low power converter in comparison to the power provided to the grid. But on isolated grid,an efficient controller is needed in order to maintain quasi-sinusoidal voltages with an important amount of non-linearload and with a small passive filter. The aim of this paper is to present a new design methodology based on the inversionof the dynamical model of the system. It also uses an original representation of the system called dynamical equivalentcircuit. Thus,a hierarchical controller is designed and validated by simulation and experimental results.
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