FACTS models for stability studies in DIgSILENT Power Factory

This work describes a methodology to including the following FACTS models devices: SVC, TCSC, SSSC, STATCOM and POD, in DIgSILENT Power Factory program, for its application in electric power systems stability studies. The implementation methodology included four stages. In the first stage those models used to represent FACTS in stability studies were selected. In the second stage, a dynamic behavior expressed in state space was programmed through the simulation language DSL. In a third stage, was determined the mathematical formulation to calculate the initial state value. The fourth stage consist in determining those mathematical expressions that relate the physical magnitudes of the system, which are wanted to modify with parameters or control signal from the FACTS model. The results obtained confirmed the correct implementation of models in Power Factory program and showed in which way FACTS devices contribute to improve power system stability.