State space modeling of three-phase transformers for small-signal analysis of a microgrid

Unlike transmission system where model of different elements are available to study system's stability there is lack of such models while studying microgrid stability, main reason being that microgrid is still an evolving topic. One such element is transformer, transformers have been an integral part of power system, and are still used in microgrid infrastructure hence it is important to model different types of transformers so that such model can be used for better analysis of system whenever needed. This paper investigates small-signal state-space model of different types of three-phase transformers which have been used in distribution system and can be used in a microgrid.