استفاده از روش‌هاي حذف بار تركيبي تطبيقي به‌منظور بهبود پايداري ولتاژ سيستم قدرت - قسمت اول: مفهوم كلي و الگوريتم‌ها
محورهای موضوعی : مهندسی برق و کامپیوترعلیرضا صفاریان 1 , مجید صنايع‌پسند 2 , امیر پیروزقلعه 3
1 - دانشگاه تهران
2 - دانشگاه تهران
3 - دانشگاه تهران
کلید واژه: افت ولتاژ حاشيه پايداري ولتاژ حذف بار تركيبي تطبيقي حذف بار فركانسي,
چکیده مقاله :
اين مقاله قسمت اول از يك مقاله دوقسمتي است كه در آن چند روش حذف بار تركيبي تطبيقي براي اصلاح روش حذف بار فركانسي متداول به‌منظور بهبود پايداري سيستم قدرت و بالاخص افزايش حاشيه پايداري ولتاژ سيستم پس از وقوع حوادث شديد پيشنهاد مي‌گردد. امروزه با گسترش شبکه‌هاي قدرت و خصوصي‌سازي و رقابتي‌شدن صنعت برق، حاشيه امنيت شبکه‌ها در مقابل انواع ناپايداري کاهش يافته است. در اين شرايط روش‌هاي حفاظتي متداول خصوصاً در حوادث تركيبي نمي‌توانند به‌خوبي از شبكه در برابر ناپايداري محافظت كنند. در برخی از این حوادث با وجود این که روش‌هاي حفاظتي متداول فركانس سیستم را به محدوده مجاز باز مي‌گردانند، نهایتاً سيستم بر اثر افت ولتاژهاي شدید دچار ناپایداری ولتاژ مي‌گردد. در برخي حوادث ديگر افت ولتاژ شدید باعث اختلال در عملکرد رله‌های فرکانسی مي‌گردد. در اين مقاله سه روش حذف بار تركيبي تطبيقي براي مقابله با اين‌گونه حوادث پيشنهاد شده است. اين روش‌ها بر اساس اطلاعات محلي اندازه ولتاژ و فرکانس و بدون نياز به ارتباط مخابراتي عمل مي‌كنند. در الگوريتم‌هاي پيشنهادشده، حذف بار از نقاط با افت ولتاژ بيشتر و طولاني‌تر در حين افت فركانس آغاز مي‌گردد و سرعت، محل و مقدار حذف بار بسته به محل وقوع حادثه و وضعيت ولتاژي سيستم و نرخ افت فركانس به‌طور تطبيقي تغيير مي‌كند. در قسمت دوم مقاله، نتايج عددي شبيه‌سازي روش متداول و روش‌هاي پيشنهادي در يك شبكه بزرگ و واقعي ارائه شده و عملكرد اين روش‌ها به‌ازاي حوادث مختلف مورد بررسي قرار گرفته است.
In this paper three combinational adaptive load shedding schemes are proposed to enhance the power system stability especially voltage stability margins of the system following severe events. Nowadays, the security margin of power systems against various instabilities is decreased due to the developments, deregulation and competitions in the power industry. In this situation, traditional system protection schemes can not offer adequate protection especially against combinational events. In some combinational disturbances, after initial frequency drop the conventional protection schemes returns back the system frequency to its permissible values; however, the system eventually collapses due to severe voltage declines which result in voltage instability. In some other disturbances, severe voltage declines cause troubles in appropriate operation of the under frequency load shedding relays. In this paper three adaptive combinational load shedding schemes are proposed to counteract such disturbances. The proposed schemes use locally measured frequency and voltage signals and do not need any communication link. In the proposed algorithms, during under frequency condition, load shedding is started from the locations which have higher voltage decay and for longer period of time. The speed, location and amount of load shedding are changed adaptively depending on the disturbance location, voltage status of the system, and the rate of frequency decline. In the second part of this paper using model of a real network, various simulation studies are performed and performance of the proposed schemes is investigated.
[1] M. Begovic, D. Novosel, and M. Milisavljevic, "Trends in power system protection and control," in Proc. 32nd Hawaii Int.Conf. on System Sciences, vol. 3, pp. 3024-3031, 5-8 Jan. 1999.
[2] C. Concordia, L. H. Fink, and G. Poullikkas, "Load shedding on an isolated system," IEEE Trans. Power Syst., vol. 10, no. 3, pp. 1467-1472, Aug. 1995.
[3] C. W. Taylor, "Concepts of undervoltage load shedding for voltage stability," IEEE Trans. Power Delivery, vol. 7, no. 2, pp. 480-488, Apr. 1992.
[4] IEEE/CIGRE Joint Task Force on Stability Terms and Definitions, "Definition and classification of power system stability," IEEE Trans. Power Syst., vol. 19, no. 3, pp. 1387-1401, Aug. 2004.
[5] D. Novosel, K. T. Vu, D. Hart, and E. Udren, "Practical protection and control strategies during large power-system disturbances," in Proc. 1996 IEEE Transmission and Distribution Conf., pp. 560-565, 15-20 Sep. 1996.
[6] "Interim report of the Investigation Committee on the 28 September 2003 blackout in Italy," prepared by Union for the Coordination of Transmission of Electricity, Belgium, Oct. 3, 2003.
[7] US–Canada Power System Outage Task Force, Final Report on the August 14, 2003 Blackout in the United States and Canada: Causes and Recommendations, 5 Apr. 2004.
[8] S. Lindahl, G. Runvik, and G. Stranne, "Operational experience of load shedding and new requirements on frequency relays," in Int. Conf. Developments in Power System Protection, pp. 262-265, 25-27 Mar. 1997.
[9] R. Kearslev, "Restoration in Sweden and experience gained from the blackout in 1983," IEEE Trans. Power Syst., vol. 2, no. 2, pp. 422-428, May 1987.
[10] D. Prasetijo, W. R. Lachs, and D. Sutanto, "A new load shedding scheme for limiting underfrequency," IEEE Trans. Power Syst., vol. 9, no. 3, pp. 1371-1378, Aug. 1994.
[11] W. R. Lachs, "Area - wide system protection scheme against extreme contingencies," in Proc. of the IEEE, vol. 93, no. 5, pp. 1004-1027, May 2005.
[12] ع. ر. صفاريان، م. صنايع‌پسند و ا. پ. قلعه، "استفاده از روش‌هاي حذف بار تركيبي تطبيقي به‌منظور بهبود پايداري ولتاژ سيستم قدرت - قسمت دوم: نتايج شبيه‌سازي‌ها،" نشريه مهندسي برق و مهندسي كامپيوتر ايران، سال 8، شماره 1، صص. 21-13، بهار 1389.
[13] J. R. Jones and W. D. Kirkland, "Computer algorithm for selection of frequency relays for load shedding," IEEE Computer Applications in Power, vol. 1, no. 1, pp. 21-25, Jan. 1988.
[14] "WECC coordinated off-nominal frequency load shedding and restoration plan," prepared by Underfrequency Issues Work Group of Western Electric Coordinating Council, Final report, Nov. 1997.
[15] IEEE Guide for the Application of Protective Relays Used for Abnormal Frequency Load Shedding and Restoration, IEEE Standard C37.117-2007, Aug. 2007.
[16] M. Nagpal, A. Moshref, Z. Shukri, J. T. Vijayan, D. Chan, and C. Henville, "Dynamic simulations optimize application of an underfrequency load shedding scheme," in Proc. 24th Annual Western Protective Relaying Conf., pp. 1-8, 12-15 Oct. 1997.
[17] P. M. Anderson and M. Mirheydar, "An adaptive method for setting underfrequency load shedding relays," IEEE Trans. Power Syst., vol. 7, no. 2, pp. 647-652, May 1992.
[18] B. Delfino, S. Massucco, A. Morini, P. Scalera, and F. Silvestro, "Implementation and comparison of different underfrequency load shedding schemes," in Proc. 2001 IEEE Power Engineering Society Summer Meeting, vol. 1, pp. 307-312, 15-19 Jul. 2001.
[19] P. Kundur, Power System Stability and Control, McGraw Hill, 1994.
[20] T. Tomsic, G. Verbic, and F. Gubina, "Revision of the underfrequency load shedding scheme of the Slovenian power system," in Proc. 2005 IEEE Power Engineering Society General Meeting, vol. 2, pp. 1782-1787, 12-16 Jun. 2005.
[21] L. J. Shih, W. J. Lee, J. C. Gu, and Y. H. Moon, "Application of df/dt in power system protection and its implementation in microcontroller based intelligent load shedding relay," in Proc. 1991 Industrial and Commercial Power Systems Technical Conf., pp. 11-17, 6-9 May 1991.
[22] H. Seyedi, M. Sanaye-Pasand, and M. R. Dadashzadeh, "Design and simulation of an adaptive load shedding algorithm using a real network," in Proc. 2006 IEEE Power India Conf., 5 pp., Apr. 2006.
[23] Y. Halevi and D. Kottick, "Optimization of load shedding system," IEEE Trans. Energy Conversion, vol. 8, no. 2, pp. 207-213, Jun. 1993.
[24] P. M. Anderson, Power System Protection, Ch. 20, Protection against Abnormal System Frequency, IEEE Press 1999, pp. 807-851.
[25] D. L. H. Aik, "A general-order system frequency response model incorporating load shedding: analytic modeling and application," IEEE Trans. Power Syst., vol. 21, no. 2, pp. 709-717, May 2006.
[26] V. V. Terzija, "Adaptive underfrequency load shedding based on the magnitude of the disturbance estimation," IEEE Trans. Power Syst., vol. 21, no. 3, pp. 1260-1266, Aug. 2006.
[27] Y. Liu and Y. Liu, "Aspects on power system islanding for preventing widespread blackout," in Proc. 2006 IEEE International Conf. on Networking, Sensing, and Control, pp. 1090-1095, Apr. 2006.
[28] P. Cote, S. P. Cote, and M. Lacroix, "Programmable load shedding systems, Hydro Quebec experience," in Proc. 2001 IEEE Power Engineering Society Summer Meeting, vol. 2, pp. 818-823, Jul. 2001.
[29] H. M. Dola and B. H. Chowdhury, "Intentional islanding and adaptive load shedding to avoid cascading outages," in Proc. 2006 IEEE Int. Conf. Networking, Sensing and Control, 8 pp., Jun. 2006.
[30] M. Sanaye-Pasand and H. Seyedi, "Centralized adaptive load shedding methods to enhance power system voltage stability margins," IEEJ Trans. Electrical and Electronic Engineering, vol. 3, no. 6, pp. 669-679, Nov. 2008.
[31] H. Arabian, A. Ranjbar, A. Shirani, and B. Mozafari, "SPS protection schemes for frequency stability in power networks," in Proc. 19th Int. Power System Conf., 12 pp., Tehran, Iran, Nov. 2004.
[32] B. Shi, X. Xie, and Y. Han, "WAMS-based load shedding for systems suffering power deficit," in Proc. 2005 IEEE Transmission and Distribution Conf. & Exhibitation: Asia & Pacific, Dalian, China, 6 pp., Aug. 2005.
[33] A. Saffarian, M. Sanaye - Pasand, and H. Asadi, "Performance investigation of new combinational load shedding schemes," in Proc. 2008 POWERCON & IEEE Power India Conf., 8 pp. Oct. 2008.
[34] A. P. Ghaleh, A Combinational Algorithm for Load Shedding in Electrical Power Networks, M. Sc. Thesis, School of Electrical and Computer Engineering, University of Tehran, Feb. 2008.
[35] M. Yong, H. Shao-bin, H. Ying - duo, G. Yuan - kai, and W. Yi, "Analysis of power-frequency dynamics and designation of under frequency load shedding scheme in large scale multi - machine power systems," in Proc. 1991 IEE Int. Conf. Advances in Power System Control, Operation and Management, Hong Kong, pp. 871-876, Nov. 1991.
[36] M. Karimi - Ghartemani and M. R. Iravani, "Wide - range, fast and robust estimation of power system frequency," Electric Power Systems Research, vol. 65, no. 2, pp. 109-117, May 2003.
