A novel voltage stability assessment tool to incorporate wind variability

This paper introduces a novel voltage stability assessment tool that incorporates wind variability. With increasing penetration of wind generation in power systems it becomes imperative to include the impact of wind power fluctuations on power transfer margin in a system. The tool is utilized to obtain a three dimensional voltage secure region of operation (VSROp). The voltage security assessment also includes remedial actions necessary to attain a desired power transfer margin over the entire range of wind variability. The developed tool is utilized to compare the effect of utilizing the DFIG capability curve over the FERC mandated plusmn 0.95 power factor requirement. The results demonstrate that restricted power factor operation could lead to an overly conservative estimate of the power transfer capability of the system while use of capability curve causes a substantial increase in the power transfer capability of the system at no extra cost.