This paper provides a set of generic equivalent collector system (ECS) parameters for power system studies of large wind power plants (WPPs) represented by single-machine equivalents. They are intended to be used when actual collector system data are not available for calculating specific ECS parameters. The accuracy that can be expected with the generic ECS is quantified for a sample of 17 actual WPPs in the range of 50-300 MW. Generic ECS parameters have shown to provide active and reactive powers at the ECS output whose accuracies are adequate for prospective or preliminary studies.