A three-phase SSVS model for power flow studies in unbalanced transmission networks

The goal of this paper is to develop a steady-state mathematical model of the new generation of power electronic-based plant components presently emerging as a result of the concept of flexible AC transmission systems (FACTS), namely the series synchronous voltage source (SSVS) controller. The modelling is carried out in the phase co-ordinate frame of reference to study the SSVS power flow control performance in three-phase transmission networks. In this context, the controller power flow equations are integrated into an existing three-phase Newton–Raphson power flow program. Guidelines and methods for implementing the proposed model are described for highly robust and unified iterative solutions. The validity of this model is verified by a numerical example. The paper concludes with an example of power flow control in a network operating under unbalanced conditions.