Control of a Stand-Alone Variable Speed Constant Frequency Generator Based on a Doubly-Fed Induction Generator

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Abstract
Variable speed and constant frequency (VSCF) generators are widely used in industry (e.g. embedded applications and renewable energy systems). Doubly-fed induction generators (DFIG) allow a such operation. Moreover, this kind of machines 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-linear load and with a small passive filter. The aim of this paper is to present a new design methodology based on the inversion of the dynamical model of the system. It also uses an original representation of the system called dynamical equivalent circuit. Thus, a hierarchical controller is designed and validated by simulation and experimental results.