A novel topological approach to examine network observability under a contingency Conference Paper uri icon


  • A reliable state estimator to withstand a contingency becomes more and more important due to the increasing concerns on the network security in a deregulated power market. A novel topological approach is proposed in this paper to identify critical measurements and to examine network observability under a contingency, where the contingency can be any single branch outage or measurement loss. To advance the classical topological observability analysis, a new concept of contingency observability graph (COG) is introduced and it is proven that a power system network maintains its observability against a contingency if and only if its COG satisfies some conditions. With little extra computation load, the proposed COG based approach is a natural extension of the classical topological observability analysis for online applications. The IEEE 30-Bus system is used to demonstrate the validity and efficiency of our approach. 2007 IEEE.

name of conference

  • 2007 IEEE Power Engineering Society General Meeting

published proceedings


author list (cited authors)

  • Huang, G. M., & Lei, J.

citation count

  • 3

complete list of authors

  • Huang, Garng M||Lei, Jiansheng

publication date

  • January 2007