Modeling of Variable-Speed Wind Farms for Power Systems Dynamic Studies

ONTIVEROS, LEONARDO J.; MERCADO, PEDRO E.

Ciudad del Este

Congreso; Décimo Cuarto Encuentro Regional Iberoamericano de Cigré; 2011

CIGRE

The variable speed double-feed induction generator wind turbine (DFIG) is today the most widely used concept in wind farms, 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 DFIG wind farms in several countries [1]. As a consequence, in the near future, this type of wind farms may start to influence the behavior of electric power systems by interacting with conventional generation and loads. Therefore, DFIG wind farm 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 wind farm appropriate for power system dynamic studies.