Application of Combinational Adaptive Load Shedding Schemes to Improve Power System Voltage Stability - Part II: Simulation Results
Subject Areas : electrical and computer engineeringA. Saffarian 1 * , M. Sanaye-Pasand 2 , A. P. Ghaleh 3
1 - University of Tehran
2 - University of Tehran
3 - University of Tehran
Abstract :
paper is part II of a two-part paper. In the first part, several adaptive combinational load shedding schemes were proposed to enhance the power system voltage stability. The main objective of the proposed schemes is to improve the voltage stability margin of the system following large and combinational disturbances. For major disturbances the frequency and voltage stability of the system are jeopardized simultaneously and the conventional schemes might fail to operate correctly. In this part, the proposed methods are simulated in a real network to evaluate their performance. To achieve realistic results, dynamic model of generators, automatic voltage regulators, governors and loads are considered in the simulations. Considering the importance of load modeling in these studies, the frequency and voltage dependence of static loads have been modeled accurately. Dynamic motor loads have also been modeled using aggregate equivalent induction motors at load buses. Performance of the proposed schemes is compared with each other also with performance of the conventional scheme for various combinational disturbances. Considering the obtained simulation results it is concluded that by using the proposed algorithms the power system becomes more robust against large disturbances and the probability of the power system instability is decreased.
[1] ع. ر. صفاريان، م. صنايعپسند و ا. پ. قلعه، "استفاده از روشهاي حذف بار تركيبي تطبيقي بهمنظور بهبود پايداري ولتاژ سيستم قدرت - قسمت اول: مفهوم كلي و الگوريتمها،" نشريه مهندسي برق و مهندسي كامپيوتر ايران، سال 8، شماره 1، صص. 12-3، بهار 1389.
[2] DIgSILENT GmbH, DIgSILENT PowerFactory V13, User Manual, 2005.
[3] P. Kundur, Power System Stability and Control, McGraw Hill, 1994.
[4] P. M. Anderson and A. A. Fouad, Power System Control and Stability, Piscataway, NJ: IEEE Press, 1994.
[5] IEEE Committee Report, "Dynamic models for steam and hydro turbines in power system studies," IEEE Trans. Power App. Syst., vol. 92, no. 6, pp. 1904-1915, Nov./Dec. 1973.
[6] W. S. Kao, C. T. Huang, and C. Y. Chiou, "Dynamic load modeling in Taipower system stability studies," IEEE Trans. Power Syst., vol. 10, no. 2, pp. 907-914, May 1995.
[7] Y. Lu, W. S. Kao, and Y. T. Chen, "Study of applying load shedding scheme with dynamic D-factor values of various dynamic load models to Taiwan power system," IEEE Trans. Power Syst., vol. 20, no. 4, pp. 1976-1984, Nov. 2005.
[8] K. Morison, H. Hamadani, and W. Lei, "Practical issues in load modeling for voltage stability studies," in Proc. 2003 IEEE Power Engineering Society General Meeting, vol. 3, pp. 1392-1397, Jul. 2003.
[9] H. Li, Y. Fan, and T. Wu, "Impact of load characteristics and low-voltage load shedding schedule on dynamic voltage stability," in Proc. Canadian Conf. on Electrical and Computer Engineering, pp. 2249-2252, 7-10 May 2006.
[10] S. S. Ladhani and W. Rosehart, "Under voltage load shedding for voltage stability overview of concepts and principles," in Proc. IEEE Power Engineering Society General Meeting, vol. 2, pp. 1597-1602, 10-10 Jun. 2004.
[11] IEEE Task Force on Load Representation for Dynamic Performance, "Standard load models for power flow and dynamic performance simulation," IEEE Trans. Power Syst., vol. 10, no. 3, pp. 1302-1313, Aug. 1995.
[12] L. Pereira, D. Kosterev, P. Mackin, D. Davies, J. Undrill, and W. Zhu, "An interim dynamic induction motor model for stability studies in the WSCC," IEEE Trans. Power Syst., vol. 17, no. 4, pp. 1108-1115, Nov. 2002.
[13] M. R. Dadashzadeh, Dynamic Modeling and Evaluation of Load Shedding Algorithms for Power Systems, M. Sc. Thesis, School of Electrical and Computer Engineering, University of Tehran, 2005.
[14] C. W. Taylor, Power System Voltage Stability, New York: McGraw-Hill, 1994.
[15] Iran Grid Management Co., Continuous Operation Instructions, 1st Issue, 2005, http://www.igmc.ir/dis/
[16] The MathWorks, Inc., Curve Fitting Toolbox for use with MATLAB User's Guide Version 1, Jul. 2002.