“…Optimal PMU Placement (OPP) has been studied by applying different algorithms to attain full observability of power systems during normal and abnormal operating conditions [ [15] , [16] , [17] , [18] , [19] , [20] , [21] , [22] , [23] , [24] , [25] , [26] , [27] ]. A literature review of different optimization techniques applied to solve the OPP problem was presented in Ref.…”