Generic Aerodynamic Model for Simulation of Variable Speed Wind Turbines

There is an increased international interest in electrical simulation models of wind turbines for stability analysis and interconnection studies. So-called "generic" models, with a model structure that is publicly available, have been required in the USA by many utilities. A working group of the Western Electricity Coordinating Council (WECC) and IEEE has developed models for different types of generators, among others for wind turbines using doubly fed induction generators (DFIG) and full size converters (FSC). Those models were so far mainly used in the USA, and the models were able to represent wind turbines with respect to common US grid code requirements. Due to an increased international interest in generic models, there is a need for updating existing models in order to improve the accuracy of the models since validation requirements in many countries now require a comparison with measurements (and not to more detailed simulation models only). It can be shown that the proposed model allows for an improved representation of the aerodynamic effects during grid faults compared to existing model approaches based on cp lambda-tables while still requiring far less parameters. The results of simulations using the proposed generator model are compared to measurements during voltage dips of a 2MW and 6MW wind turbine. The new generic aerodynamic model will be proposed as extension for the WECC/IEEE aerodynamic models as well as basis for the draft of the IEC TC88 working group 27 (61400-27) on modelling and model validation.