Several computer programs exist to carry out dynamicsimulations and this study will focus on one of them,namely DigDilent PowerFactory. It offers two built-in modelsof doubly-fed induction generator. A new model has also beendeveloped, based upon a controllable voltage source. Thesethree models are compared, in terms of dynamic behavior andsimulation time. One of them is then used to study the impact ofan input control signal based on the single machine equivalentmethod. This signal provides power oscillation damping.