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Phasor based power system simulation software was originally conceived to study electromechanical interactions between rotating machinery and the network. Today, fast power electronic equipment is also commonly represented in phasor based power system software, although their dynamic behavior may violate some assumptions that lie at the basis of the phasor approximation. Modeling fast acting devices in phasor based power system software presents a number of challenges: due to the small time constants involved, time efficient simulation is a challenge. Furthermore, adverse interactions can occur between detailed models and state-of-the-art solution methods. The paper presents a robust implementation method on three levels: robustness of the tool, of the interface, and of the model itself, that leads to robust, accurate and efficient simulation of power systems with fast acting devices.