Optimal meter placement for maintaining observability during single branchoutages

This paper presents a method for designing measurement systems, that will n ot only make the systems observable, but also will maintain observability a gainst loss of network branches. A linear programming based solution is pro posed for choosing a measurement configuration that will make the system fu lly observable. Subsequently, a systematic method of appending a minimum nu mber of additional measurements to ensure full observability against branch outages, is described. Contingencies considered in this paper relate to th e loss of any single branch. However, the method can be extended to the cas e of multiple contingencies, provided the cost of adding more meters is fin ancially justifiable. Numerical examples illustrating the proposed method, are given in the paper.