A new model of the double-feed induction generator wind turbine

The variable speed double-feed induction generator wind turbine (DFIG) is today the most widely used concept, owing to its high performance, its capability to capture the maximum wind energy, and the low cost of the induction machine. These features contribute to the continuous installation of the DFIG power generation in several countries [1]. As a consequence, in the near future, this type of wind turbines may start to influence the behavior of electric power systems by interacting with conventional generation and loads. Therefore, DFIG turbine models that can be integrated into power system simulation software are needed. The DFIG is a standard, wound rotor induction machine with its stator winding connected directly to the grid and its rotor windings connected to the grid trough an ac/dc/ac PWM converter. The ac/dc/ac converter normally consists of a machine-side converter and a grid-side converter, both of which are controlled by decoupled d-q control approaches. The detailed model of the DFIG demands high computational requirement, which increases when a wind farm is considered. The aim of this paper is, therefore, to propose a new simplified model of the DFIG appropriate for bulk power system dynamic studies.