  Traditional synchrophasor measurement-based islanding detection techniques
have primarily relied on voltage angle measurements and/or their derivatives
for successfully detecting islands. However, relatively high instrumentation
channel errors associated with phasor measurement unit (PMU) data, can
significantly degrade islanding detection accuracies. In this paper, a new
islanding detection scheme employing cumulative sum of change in voltage phase
angle difference (CUSPAD) is proposed, which is immune to additive
instrumentation channel errors in the PMU measurements. The robustness of the
proposed islanding detection algorithm is established through application to an
18-bus test system and the IEEE 118-bus system having different wind energy
penetration levels. Comparative analysis of the accuracies of the proposed
approach (CUSPAD) and the conventional angle difference (AD) approach prove the
former's superior performance when additive instrumentation channel errors are
present.
