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A System Line Overload Index for Contingency Assessment of Nigeria's 330kV Transmission System

Authors(3) :-Ganiyu A. Ajenikoko, Anthony, A. Olaomi

Contingency analysis is an abnormal condition in electrical network. It puts the whole system or a part of the system under stress. It occurs due to sudden opening of a transmission line, generator tripping, sudden change in generation and sudden change in load value.

This paper presents a System Line Overload Index (SLOI) for contingency assessment of Nigeria’s 330kV transmission system. The analysis started with the determination of the receiving and sending end voltages of the buses in order to compare their values for safety operation. The ratio of the receiving and sending end voltages of the buses was determined as a basis for the mathematical computation of the System Line Outage Index (SLOI).

The results of the work showed that the outage of Osogbo to Aiyede had the most critical effect on the system because, at this line, a peak SLOI value of 0.99998 was obtained with sending and receiving end voltages of 1.84V and 1.81192V respectively. The outage of Osogbo to Ikeja West line had the least SLOI value of 0.069, hence the least critical effect on the system. This SLOI value gave a corresponding receiving and sending end voltages of 1.04272V and 1.12V respectively. Additional lines should be used to connect Osogbo to Aiyede to create more links for power to be transmitted to Lagos area so as to reduce the SLOI value of Osogbo to Aiyede line.

The work will stress the importance of operating the transmission system defensively to avoid system collapse due to overloading so as to improve the lines’ active power capability contingency event using Flexible AC Transmission (FACT) devices because of their fast switching ability.

Ganiyu A. Ajenikoko, Anthony, A. Olaomi
Contingency, SLOI, Sending End Voltage, Receiving End Voltage, Transmission System, Power Grid.
  1. Ajjarapu V and Meliopoulos A.P.S (2008): Preventing voltage collapse with protection systems that incorporate Optimal Reactive Power Control," PSERC Publication, October 6-October 20, Pp 23-36.
  2. Ali N.A (2005): "An Overview of system collapses on the Nigerian Grid Network," Proceedings of the international conference on power systems operations and planning, Universidade Jean Piaget, May 22nd – May 26th, 2005, Pp 67-70.
  3. Bachar R (2009): "Graphical Interactions and visualization for the Analysis and interpretation of contingency analysis results," Proceedings of IEEE Power industry computer application conference, Pp 128-134.
  4. Brandwajn V (2008): "Efficient Bounding Method for Linear Contingency Analysis," IEEE Transactions on power systems, Vol. 3, No. 1, Pp 23-45.
  5. Chary, D.M (2011): "Contingency Analysis in power systems, Transfer Capability Computation and Enhancement Using FACTS devices in Deregulated Power systems," PhD Dissertation, Jawaharlal Nehru Technological University.
  6. Ejebe G.C and Wollenberg B.F (2009): " Automatic Contingency Selection," IEEE Trans on PAS-98, Pp 97-109
  7. Eldeen S, Mohammed G, Mohammed A.Y and Abdulrahim (2012): "Power system contingency analysis to detect network weaknesses," Zaytoonah University International Engineering Conference on Design and Innovation in infrastructure (ZEC Infrastructure 2012), June 18-20, Amman, Jordan.
  8. Enns M. Quada J.J and Sackett B(2012): " Fast Linear Contingency Analysis", IEEE Trans on PAS, Vol. PAS-101, No. 4, Pp 783-791.
  9. Glover J.D, Sarima M.S, Overbye T.I (2012): "Power System Analysis and Design," 5th Edition. Stanford Cengage Learning, Pp 78-92.
  10. Guler T, Gross G and Liu M (2011):" Generalized Line Outage Distribution Factor," Power Systems, IEEE Trans, Vol. 22, Issue 2, Pp 879- 881.
  11. Kundur P (1994): "Power system stability and control," New Delhi, Tata McGraw-Hill Publishing Company Ltd., Third Edition, Pp 234-246.
  12. Mohamed S.E.G, Mohamed A.Y and Abdelrahim Y.H (2012): "Power System Contingency Analysis to Detect Network weakness," Zaytoonah University International Engineering Conference on Design and Innovation in Infrastructure, Amman, Jordan Pp 13-41.
  13. Nara K, Tanaka K, Kadama H, Shoults R.R, Chen M.S, Olinda P.V and Bertangnolli D (1985): "On-line Contingency Selection for Voltage Security Analysis," ibid, Vol. PAS-104, Pp 847-856.
  14. Ogbuefi U.C (2013): "A Power flow Analysis of Nigeria Power system with compensation on some buses," PhD Thesis, University of Nigeria, Nsukka, Nigeria.
  15. Onohaebi O.S (2009): "Power outage in the Nigerian Grid," Research Journal of Applied Sciences 4(1) 1-9.
  16. Pentayya P, Mukhopadhyay P, Banerjee S and Thakur M.K (2010): " Contingency analysis for Eastern Regional Grid of India", 16th National Power Systems Conference, Pp 359-363.
  17. Radha K, Rani J and Kamaksharah S (2011): "Contingency Analysis under Deregulated Power Systems," ICOST –ACSE Journal, Volume 11, Issue 2, Pp 23-37.
  18. Saadat H (2002): "Power System Analysis," New Delhi, McGraw Hill, Pp 182-256
  19. Sule A.H (2010): "Major Factors affecting generation, transmission and distribution in Nigeria," International Journal of Engineering and Mathematical intelligence, Volume 1, Nos 1 & 2, Pp 23-34.
  20. Tinney W.F and Enns M.K (1994): "Controlling and Optimizing Power Systems," IEEE Spectrum, Pp 56-60.
  21. Wood A.J, Wallenberg B.F (1996): ‘Power Generation, Operation and Control," 2nd Edition, New York/USA: John Wiley and Sons, Pp 410-432.
Publication Details
  Published in : Volume 1 | Issue 4 | September-October 2015
  Date of Publication : 2015-10-25
License:  This work is licensed under a Creative Commons Attribution 4.0 International License.
Page(s) : 16-22
Manuscript Number : IJSRST151327
Publisher : Technoscience Academy
PRINT ISSN : 2395-6011
ONLINE ISSN : 2395-602X
Cite This Article :
Ganiyu A. Ajenikoko, Anthony, A. Olaomi, "A System Line Overload Index for Contingency Assessment of Nigeria's 330kV Transmission System", International Journal of Scientific Research in Science and Technology(IJSRST), Print ISSN : 2395-6011, Online ISSN : 2395-602X, Volume 1, Issue 4, pp.16-22, September-October-2015
URL : http://ijsrst.com/IJSRST151327