01714nas a2200229 4500008003900000022001400039245005900053210005900112260001200171300001400183490000700197520107000204653001301274653000901287653001001296653002401306100001701330700001801347700002101365700002301386856007501409 2011 d a0885-895000aControlled Islanding Demonstrations on the WECC System0 aControlled Islanding Demonstrations on the WECC System c02/2011 a334 - 3430 v263 aCascading outages have resulted in significant disruptions to power systems all over the world. Controlled islanding can provide a corrective measure of last resort to alleviate the impact of large disturbances. This paper provides detailed demonstrations of using controlled islanding to prevent cascading outages in bulk power systems. To test the islanding performance, four extreme contingencies under two different operating conditions of the WECC system are tested using time domain simulations. The cutsets used in the controlled islanding cases are obtained from a software package developed in earlier work by the authors. Time domain simulation results for the four contingencies with controlled islanding and uncontrolled islanding are shown, and the dynamic performance in each case is analyzed. Further analyses are conducted to examine the amount of load shed in each case, and a discussion of the cutset sensitivity and time sensitivity of islanding is provided. Finally, the discussion of practical implementation issues and conclusions is provided.10aAA05-00110aAARD10aCERTS10adynamic simulations1 aXu, Guangyue1 aVittal, Vijay1 aMeklin, Anatoliy1 aThalman, Jon, Eric uhttps://certs.lbl.gov/publications/controlled-islanding-demonstrations01820nas 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