01820nas a2200217 4500008003900000022001400039245008000053210006900133260001200202300001400214490000700228520116900235653001301404653000901417653002201426653002501448653002701473100001701500700001801517856006701535 2010 d a0885-895000aSlow Coherency Based Cutset Determination Algorithm for Large Power Systems0 aSlow Coherency Based Cutset Determination Algorithm for Large Po c05/2010 a877 - 8840 v253 aThis paper provides an integrated algorithm to identify a cutset for a large power system for the application of a slow coherency based controlled islanding scheme. Controlled islanding is employed as a corrective measure of last resort to prevent cascading outages caused by large disturbances. The large scale power system is represented as a graph and a simplification algorithm is used to reduce the complexity of the system. Generators belonging to the same slowly coherent group are collapsed into a dummy node, and a graph partition library is used to split the graph into a given number of parts. Some extra islands formed by the partition library are merged into their adjacent large islands and the original cutset of the actual power system is recovered from the highly simplified graph. A software package was developed to test the efficiency of the algorithm, and dynamic simulations were run on the WECC system to verify the effectiveness of the cutset obtained. The WECC system has more than 15 000 buses and 2300 generators. Detailed steps to develop an islanding strategy for a specified contingency for a large system are described in this paper.10aAA05-00110aAARD10acascading outages10acontrolled islanding10adistributed generation1 aXu, Guangyue1 aVittal, Vijay uhttps://certs.lbl.gov/publications/slow-coherency-based-cutset