A new contingency analysis approach for voltage collapse assessment

Voltage collapse analysis in power systems has been the subject of concern of many researchers. Recently, a new technique based on tangent vector behavior has shown to be attractive, because of the accuracy and the low computational effort required. In this paper, tangent vector is employed for contingency analysis. The idea consists of monitoring tangent vector norm associated with each contingency, identifying the most critical ones. The method is tested with the help of the IEEE-118 bus and the Southeastern Brazilian power systems, considering the generators reactive power limits.