A new unified scheme for controlled power system separation using synchronized phasor measurements

Kai Sun, Kyeon Hur, Pei Zhang

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)


Controlled power system separation, which separates the transmission system into islands in a controlled manner, is considered the final resort against a blackout under severe disturbances, e.g., cascading events. Three critical problems of controlled separation are where and when to separate and what to do after separation, which are rarely studied together. They are addressed in this paper by a proposed unified controlled separation scheme based on synchrophasors. The scheme decouples the three problems by partitioning them into sub-problems handled strategically in three time stages: the Offline Analysis stage determines elementary generator groups, optimizes potential separation points in between, and designs post-separation control strategies; the Online Monitoring stage predicts separation boundaries by modal analysis on synchrophasor data; the Real-time Control stage calculates a synchrophasor-based separation risk index for each boundary to predict the time to perform separation. The proposed scheme is demonstrated on a 179-bus power system by case studies.

Original languageEnglish
Article number5699385
Pages (from-to)1544-1554
Number of pages11
JournalIEEE Transactions on Power Systems
Issue number3
Publication statusPublished - 2011 Aug

Bibliographical note

Funding Information:
Manuscript received April 19, 2010; revised August 15, 2010 and October 15, 2010; accepted December 03, 2010. Date of publication January 20, 2011; date of current version July 22, 2011. This work was supported by the Electric Power Research Institute (EPRI). Paper no. TPWRS-00307-2010. K. Sun and P. Zhang are with the Electric Power Research Institute, Palo Alto, CA 94304 USA (e-mail: ksun@epri.com; pzhang@epri.com). K. Hur is with Yonsei University, Seoul, Korea (e-mail: khur@yonsei.ac.kr). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TPWRS.2010.2099672

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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