A New Unified Scheme for Controlled Power System Separation Using Synchronized Phasor Measurements

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.

[1]  N. Senroy,et al.  Decision Tree Assisted Controlled Islanding , 2006, IEEE Transactions on Power Systems.

[2]  Damien Ernst,et al.  Transient Stability of Power Systems: A Unified Approach to Assessment and Control , 2000 .

[3]  Kai Sun,et al.  Splitting strategies for islanding operation of large-scale power systems using OBDD-based methods , 2003 .

[4]  Hong Liu,et al.  Generative design supported by evolutionary computing approach , 2007, Int. J. Comput. Appl. Technol..

[5]  Wenxin Liu,et al.  Angle Modulated Particle Swarm Optimization Based Defensive Islanding of Large Scale Power Systems , 2007, 2007 IEEE Power Engineering Society Conference and Exposition in Africa - PowerAfrica.

[6]  Kai Sun,et al.  A New System Splitting Scheme Based on the Unified Stability Control Framework , 2007, IEEE Transactions on Power Systems.

[7]  G.T. Heydt,et al.  A Novel Slow Coherency Based Graph Theoretic Islanding Strategy , 2007, 2007 IEEE Power Engineering Society General Meeting.

[8]  Mania Ribbens-Pavella,et al.  A simple direct method for fast transient stability assessment of large power systems , 1988 .

[9]  S. Santoso,et al.  Estimation of System Damping Parameters Using Analytic Wavelet Transforms , 2009, IEEE Transactions on Power Delivery.

[10]  Kai Sun,et al.  A simulation study of OBDD-based proper splitting strategies for power systems under consideration of transient stability , 2005 .

[11]  Wenxin Liu,et al.  Binary Particle Swarm Optimization Based Defensive Islanding Of Large Scale Power Systems , 2007, Int. J. Comput. Sci. Appl..

[12]  Kai Sun,et al.  A study of system splitting strategies for island operation of power system: a two-phase method based on OBDDs , 2003 .

[13]  V. Vittal,et al.  Slow coherency-based islanding , 2004, IEEE Transactions on Power Systems.

[14]  Joe H. Chow,et al.  Inertial and slow coherency aggregation algorithms for power system dynamic model reduction , 1995 .

[15]  D.J. Trudnowski.  Estimating Electromechanical Mode Shape From Synchrophasor Measurements , 2008, IEEE Transactions on Power Systems.

[16]  Ruisheng Diao,et al.  Decision tree assisted controlled islanding for preventing cascading events , 2009, 2009 IEEE/PES Power Systems Conference and Exposition.

[17]  Daniel Karlsson,et al.  Wide-Area Protection and Power System Utilization , 2005, Proceedings of the IEEE.

[18]  Kai Sun,et al.  Searching for feasible splitting strategies of controlled system islanding , 2006 .

[19]  V. Vittal,et al.  System islanding using minimal cutsets with minimum net flow , 2004, IEEE PES Power Systems Conference and Exposition, 2004..

[20]  C. W. Taylor,et al.  Model validation for the August 10, 1996 WSCC system outage , 1999 .

[21]  J. F. Hauer,et al.  Application of Prony analysis to the determination of modal content and equivalent models for measured power system response , 1991 .

[22]  P. Kundur,et al.  Power system stability and control , 1994 .

[23]  Damien Ernst,et al.  Transient Stability of Power Systems , 2000 .

[24]  Xiao Li,et al.  Parallel Implementation of OBDD-Based Splitting Surface Search for Power System , 2007, IEEE Transactions on Power Systems.

[25]  G.T. Heydt,et al.  Slow-Coherency-Based Controlled Islanding—A Demonstration of the Approach on the August 14, 2003 Blackout Scenario , 2006, IEEE Transactions on Power Systems.