  This paper proposes a method of identifying single line outages in power
systems based on phasor measurement unit (PMU) measurements and ac power flow
models. In addition to the main identification algorithm, a rejection filter is
introduced so that the preliminary identified results can be further processed
and categorized into three types: correctly identified, misidentified and
inconclusive (including correct-filtered and misidentified-filtered). The
methods are systematically tested using test systems of various sizes for
various PMU placements, and the results show that the proposed identification
algorithm has a high identification accuracy and the proposed rejection filter
is able to reduce the misidentified rate without significantly increasing the
number of inconclusive cases.
