Simplified modelling of wind farms for voltage dip transients

This paper addresses the issue of simplified modelling of large scale wind farms and its impact on the accuracy of dynamic systems responses to grid transient faults. We propose a simplified model consisting of a detailed wind turbine model with scaled-up outputs, versus the conventional aggregate representation of wind farms. The simplification methods are compared for their suitability to grid voltage dip transients of increased duration. The methods are applied to a wind farm split into three coherent clusters. The results show that the aggregate machine model is suitable for static and short transient grid faults, but limited in voltage ride through studies of grid faults of longer clearing time.