Wind Farm Modeling For Reliability Assessment from the Viewpoint of Interconnected Systems

Improvement in power system reliability is considered today to be one of the main system planning needs. Meanwhile, there is a growing tendency toward reliability studies considering renewable energies. In this article, for reliability assessment of a power system including wind power, an analytical method based on the frequency and duration approach is utilized to model a wind farm as a multi-state conventional unit. A suitable time-series model-the auto-regressive moving average-is employed in this study to predict wind speeds. The equivalent unit approach is modeled, representing the benefits of interconnection between the two systems in terms of an equivalent multi-state unit. This model includes the constraints and parameters of the tie-lines interconnecting the two systems. Results confirm that the adequacy of the generating capacity in a power system is normally improved by interconnecting the system to another power system. To do so, the wind farm is considered as an assisting system for a test system, and reliability indices of the total system are then calculated.