%0 Journal Article
%J IEEE Transactions on Power Systems
%D 2011
%T Controlled Islanding Demonstrations on the WECC System
%A Xu, Guangyue
%A Vijay Vittal
%A Meklin, Anatoliy
%A Thalman, Jon Eric
%K AA05-001
%K AARD
%K CERTS
%K dynamic simulations
%X Cascading 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.
%B IEEE Transactions on Power Systems
%V 26
%P 334 - 343
%8 02/2011
%N 1
%! IEEE Trans. Power Syst.
%R 10.1109/TPWRS.2010.2047413
%0 Journal Article
%J IEEE Transactions on Power Systems
%D 2010
%T Slow Coherency Based Cutset Determination Algorithm for Large Power Systems
%A Xu, Guangyue
%A Vijay Vittal
%K AA05-001
%K AARD
%K cascading outages
%K controlled islanding
%K distributed generation
%X This 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.
%B IEEE Transactions on Power Systems
%V 25
%P 877 - 884
%8 05/2010
%N 2
%! IEEE Trans. Power Syst.
%R 10.1109/TPWRS.2009.2032421