A two-level voltage stability monitoring method based on P-V sensitivity assessment

In this paper, the authors will introduce a two-level voltage stability evaluation method consists of control center level and substation level. At control center level, some certain sensitivities related with operation state of overall system are calculated and these variables are sent to several substations. At substation level, the proposed method adopts a different system model rather than Thevenin Equivalent Circuit, such that the results of local voltage stability assessment are more accurate than traditional distributed methods. The performance of the proposed method is tested on IEEE 39-bus system.