Power System Security Improvement by a Linear Approximation Method
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2015 by IJETT Journal|
|Year of Publication : 2015|
|Authors : U.N. Asibeluo, T.C. Madueme
|DOI : 10.14445/22315381/IJETT-V27P212|
U.N. Asibeluo, T.C. Madueme"Power System Security Improvement by a Linear Approximation Method", International Journal of Engineering Trends and Technology (IJETT), V27(2),74-78 September 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
This paper presents a linear approximation method for calculating risk-based index of low voltage security. MATLAB source codes using the concept of risk that considers both the probability of occurrence and the severity of the contingency were used to analyze the low voltage security. Sensitivities of voltage with respect to active power and reactive power, the mean/variance of the load uncertainty were used to achieve the Probability distribution. Continuous severity function was adopted to quantify the severity because it uniformly quantifies the severity of the contingencies. The Nigerian 330KV transmission grid was used to illustrate the proposed method and the risk indices were evaluated after a contingency was simulated. The calculated risk indices reflect a quantitative measure of the system low voltage security levels. They are efficient means of quickly indentifying and investigating situations that cause high risk to the system.
 C. J. Nnonyelu, B. O. Anyaka and T. C. Madueme, Power
System Contingency Analysis: A Study of Nigeria’s 330KV
Transmission Grid, Proceedings of the 4th Electrical Engineering
National Conference, University of Nigeria, Nsukka, pp. 250-
258, 21-23 July 2013.
 J. McCalley, S. Asgarpoor, L. Bertling, R. Billinton, H. Chao, J. Chen, J. Endrenyi, R. Fletcher, A. Ford, C. Grigg, G. Hamoud, D. Logan, A. P. Meliopoulos, M. Ni, N. Rau, L. Salvaderi, M.Schilling, Y. Schlumberger, A. Schneider and C. Singh, Probabilistic Security Assessment for Power System Operations, A task force Organized by the IEEE PES Reliability, Risk and Probability Applications Subcommittee, 2001.
 U. De-Martinis and C. Battiselli, Deterministic and Risk Based Approaches to Power Systems Security Assessment, International Congresses on Electrical Engineering, Catania, pp. 1-8, 27-29 September 2009.
 D. S. Kirschen and D. Jayaweera, Comparison of Risk and Deterministic Security Assessments, IET Generation, Transmission, Distribution, Vol. 1, Issue 4, pp. 527-533, 2007.
 B. Zhou, P. Zhang, J. Chen, X. Jin, K. Hou, M. Niu, Z. Xu and Y. Lei, Application of Risk-based Flexibility Assessment Methods to Evaluate System Expansion Plans, Energy and Power Engineering, Vol.5, No. 4B, pp. 1022 – 1025, July 2013.
 J. D. McCalley, V. Vittal and N. Abi-Samra, An Overview of Risk based Security Assessment, Proceeding of the IEEE Power Engineering Society Summer Meeting, Vol. 1, pp. 173 – 178, July 1999.
 M. Ni, J. D. McCalley, V. Vittal and T. Tayyib, Online Risk – Based Security Assessment, IEEE Transactions on Power Systems, Vol. 18, No. 1 pp. 258 – 265, February 2003.
 X. Xu, F. Dong and M. J. S. Edmonds, Risk Assessment of Power System with PSSTME. Power Transmission and Distribution, Siemens, Issue 101.
 M. Marsadek, A. Mohamed, Z. and M. Norpiah, Risk Assessment of Line Overload in a Practical Power System Considering Different Types of Security Functions, Proceedings of the 9th WSEAS International Conference on Applications of Electrical Engineering, pp. 74-79, 2010.
 T. Govindaraj and S. Dinesh, Simulation Modeling on Risk- Based Optimal Power Flow using Bio Inspired Algorithm, International Journal of Innovative Research in Electrical, Electronics, Instrumentation and Control Engineering, Vol. 2, Issue 1, pp. 881-885, January 2014.
 A. Dissanayaka, Risk Based Dynamic Security Assessment, The University of Manitoba Winnipeg, Manitoba, Canada, August 2010.
 R. A. Jokojeje, I. A. Adejumobi, A. O. Mustapha and O. I. Adebisi, Application of Static Synchronous Compensator (STATCOM) in Improving Power System Performance: A Case Study of the Nigerian 330KV Electricity Grid, Nigerian Journal of Technology (NIJOTECH), Vol. 34, No. 3, pp. 564 – 572, July 2015.
 U. C. Ogbuefi and T. C. Madueme, A Power Flow Analysis of the Nigerian 330KV Electric Power System, IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE), Vol. 10, Issue 1, pp. 46-57, February 2015.
 I. G. Adebayo, D. O. Aborisade and K. A. Oyesina, Steady State Voltage Stability Enhancement Using Static Synchronous Series Compensator (SSSC); A Case Study of Nigerian 330KV Grid System, Research Journal in Engineering and Applied Sciences, Vol. 2, No. 1, pp. 54 – 61 2013.
Power system security, risk-based index, severity function.