Control of DFIG for wind energy in a network context: A new formulation and interpretation of the control specifications

This paper investigates the interaction of a Doubly Fed Induction Generator (DFIG) based wind system with the other components of the power system, like other rotating machines and branches of the grid. The power delivered by the DFIG is controlled via PI regulators, which are usually designed neglecting the interaction between the grid and the wind turbine, although the grid voltage and frequency cannot be considered as perfectly constant. This study emphasizes the impact of considering a network context on DFIG control performances and the need of a new formulation and interpretation of the DFIG control specifications. The DFIG based Wind Turbine, both the converters and their detailed controls are simulated with a grid benchmark model under faulty grid conditions.