Cutset-angle based wide area thermal security region and its application in China Southern Power Grid

SUMMARY This paper presents a novel methodology for constructing wide area thermal security region (WATSR) to monitor the wide area thermal security of bulk power system under “N−1” criterion by utilizing wide area measurement system. A general cutset angle for large-scale inter-area power system is defined and developed as a measurement to assess the system thermal security so as to construct WATSR in cutset-angle space. WATSR consists of all stable operating points under “N−1” criterion, while its boundary is a complete set of all the critical points. In this paper, the boundary of WATSR is represented via its piecewise approximation with a set of hyperplanes to enhance the calculating speed. Hyperplanes are described as a set of linear equalities, which are convenient to be determined. And, because coefficients of a hyperplane can indicate the sensitivities between various control parameters, it is beneficial to power system online security assessment and control strategy optimization. A two-step algorithm is given to apply WATSR to online monitoring for bulk power system. The first step is offline calculation. The aim of this step is to determine a minimum set of hyperplanes to properly describe the boundary of WATSR. A hyperplane is a sub-segment of the security region boundary and normally corresponds to a certain constraint. The second step is online matching. Data retrieved from wide area measurement system are used to determine the relative constraints given by the hyperplanes. And then, the stability of the system can be quickly and accurately determined by the assistance of WATSR result. Once the power system turns to critical, WATSR can help the operators to optimize their control strategy. The methodology of WATSR has been successfully implemented in the China Southern Power Grid, which is known as one of the largest alternating current/direct current parallel transmission system in the world. Feasibility and effectiveness of the presented method have been validated through intensive analyses in China Southern Power Grid. Copyright © 2014 John Wiley & Sons, Ltd.

[1]  S.T. Lee.  For the Good of the Whole , 2007, IEEE Power and Energy Magazine.

[2]  Vahid Madani,et al.  Wide-Area Monitoring, Protection, and Control of Future Electric Power Networks , 2011, Proceedings of the IEEE.

[3]  I. Kamwa,et al.  Causes of the 2003 major grid blackouts in North America and Europe, and recommended means to improve system dynamic performance , 2005, IEEE Transactions on Power Systems.

[4]  Innocent Kamwa,et al.  Wide-area measurement based stabilizing control of large power systems-a decentralized/hierarchical approach , 2001 .

[5]  Kenneth E. Martin,et al.  WACS-Wide-Area Stability and Voltage Control System: R&D and Online Demonstration , 2005, Proceedings of the IEEE.

[6]  James D. McCalley,et al.  Security boundary visualization for systems operation , 1997 .

[7]  Chen-Ching Liu,et al.  Empirical Analysis of the Impact of 2003 Blackout on Security Values of U.S. Utilities and Electrical Equipment Manufacturing Firms , 2007, IEEE Transactions on Power Systems.

[8]  S. T. Lee.  Community activity room/sup /spl trade// as a new tool for transmission operation and planning under a competitive power market , 2003, 2003 IEEE Bologna Power Tech Conference Proceedings,.

[9]  Ian Dobson.  Voltages Across an Area of a Network , 2012, IEEE Transactions on Power Systems.

[10]  C.W. Taylor,et al.  The anatomy of a power grid blackout - Root causes and dynamics of recent major blackouts , 2006, IEEE Power and Energy Magazine.

[11]  James D. McCalley,et al.  Composite security boundary visualization , 1999 .

[12]  D. Hill,et al.  Computation of Bifurcation Boundaries for Power Systems: a New , 2000 .

[13]  Shuai Lu,et al.  PMU-Based Wide-Area Security Assessment: Concept, Method, and Implementation , 2012, IEEE Transactions on Smart Grid.

[14]  Shuai Lu,et al.  Wide Area Security Region Final Report , 2010 .

[15]  Christian Rehtanz,et al.  Design Aspects for Wide-Area Monitoring and Control Systems , 2005, Proceedings of the IEEE.

[16]  Jin Zhong,et al.  China's energy and environment , 2006, IEEE Power and Energy Magazine.

[17]  Felix F. Wu,et al.  Probabilistic steady-state and dynamic security assessment , 1988 .

[18]  Robert Fischl,et al.  An inter-area transmission and voltage limitation (TVLIM) program , 1995 .

[19]  F.F. Wu,et al.  China's future in electric energy , 2005, IEEE Power and Energy Magazine.