Three phase dynamics analyzer: A new program for dynamic simulation using three phase models of power systems

In this paper a new approach for studying slow transients, such as electromechanical transients, using three phase models of power systems is presented. Typically programs used for studying slow transients assume a positive sequence network model, limiting their application to the study of balanced power systems. While electromagnetic simulation software can be used for studying slow transients in unbalanced networks, their application to large systems can be resource and time intensive. The approach presented here overcomes the aforementioned limitations of existing software and provides a means for studying slow transients using complete three phase models of the electric network. Of the many potential applications of the approach presented, evaluating the impact of Distributed Generation (DG), such as rooftop solar photovoltaic (PV) based DG, on the stability of the electric grid is important particularly for utilities with high penetration of DG.