Voltage Stability Analysis in the Albanian Power System


  • Marjela Qemali
  • Rajmonda Bualoti Department of Electric Power System Polytechnic University of Tirana
  • Marialis Çelo


Voltage Stability, power system analysis, power system reinforcement, instability


With the new social-economical developments and the free moving of the population, the electricity consumption in Albania has changed significantly. The main problem facing by Albania Electric Power System is that the power demand is increasing rapidly whereas the supply growth is constrained by reduced capital availability. Many failures have been occured in Albanian power systems due to voltage instability, in the past few years. This paper mainly concern steady state voltage stability by capability checking of Albanian power system to maintain the voltage profile in the presence of active/reactive load variations. Voltage stability analysis was performed by utilizing voltage stability tools in NEPLAN software.

The paper discusses the results of different methods in comparison of investments impact in the voltage stability. The results have shown that in heavily loaded power system of Albania the voltage stability problems cannot be met with the existing transfer capabilities, even with shunt compensation. New transmission capacities are necessary to improve the voltage stability.




Annual Reports 2005-2012, www.ere.gov.al

C.W. Taylor, Power system voltage stability, McGraw Hill, NY, 1994.

IEEE/PES Special Publication, Voltage stability assessment, procedures and guides, Final Report, January 2001.

R.J. Koessler, Voltage instability/collapse – an overview, Proc. IEE Colloquium on Voltage Collapse, London, UK, Digest No. 1997/01, pp. 1/6- 6/6, 1997.

P.A. Lof, T. Smed, G. Andersson and D.J. Hill, Fast calculation of voltage stability index, IEEE Trans. on PS, Vol. 7, No. 1, pp. 54-60, 1992.

B. Gao, G.K. Morison and P. Kundur, Voltage stability evaluation using modal analysis, IEEE Trans. on PS, Vol. 7, No. 4, pp. 1529-1542, 1992.

T.J. Overbye and C.L. DeMarco, Improved techniques for power system voltage stability assessment using energy methods, IEEE Trans. on PS, Vol. 6, No. 4, pp. 1446-1452, 1991.

T.J. Overbye, Use of energy methods for on-line assessment of power system voltage security, IEEE Trans. on PS, Vol. 8, No. 2, pp. 452-458, 1993.

A.M. Chebbo, M.R. Irving and M.J.H. Sterling, Voltage collapse proximity indicator: behavior and implications, IEEE Proc. Gener. Transm. Distrib. Vol. 139, No. 3, pp. 241-252, 1992.

M.H. Haque, A fast method of determining the voltage stability limit of a power system, Electric Power Systems Research, Vol. 32, pp. 35-43, 1995.

K. Vu, M.M. Begovic, D. Novosel and M.M. Saha, Use of local measurements to estimate voltage stability margin, IEEE Trans. on PS, Vol. 14, No. 3, pp. 1029-1-34, 1999.

M.H. Haque, On-line monitoring of maximum permissible loading of a power system within voltage stability limit, IEE Proc. – GTD, Vol. 150, No. 1, pp. 107-112, 2003.

G. Verbic and F. Gubina, Fast voltage-collapse line-protection algorithm based on local phasors, IEEE Proc. – GTD, Vol. 150, No. 4, pp. 482-486, 2003.

L. Warland and A. T. Holen, Estimation of distance to voltage collapse:Testing and algorithm based on local measurements, Proc. of the 14th PSCC, Sevilla, Spain, 24-28 June 2002.

Cigre Publication, Criteria and countermeasures for voltage collapse, Cigre Task Force 38-02-12, 1994

Cigre Publication, Protection against voltage collapse, Cigre Working Group 34-08, 1998.

C. D.Vournas, Voltage Instability: Phenomena, Countermeasures, and Analysis methods, Proceedings of the IEEE, Vol.88, Issue:2, Feb. 2000, pp.208 – 227.

Editor/Coordinator: Claudio Canizares, Voltage Stability Assessment: Concepts, Practices and Tools, IEEE/PES Power System Stability Subcommittee Special Publication, August 2002

P.Kundur, Power System Stability and Control, McGraw-Hill, NewYork, 1994

Claudia Reis, F.P. Maciel Barbosa, A Comparison of Voltage Stability Indices, IEEE MELECON 2006, May 16-19, Benalmádena (Málaga), Spain


R.Bualoti, M.Qemali, L.Gjini, N.Hobdari, M.Çelo, A Method For Defining The Location Of Facts Devices – Type SVC, MAKOCIGRE 2009, 6. Conference - Ohrid, Maqedoni. (ID0361) October 4-6, 2009

A. Yokoyama and T. Kumano, Static voltage stability index using multiple load-flow solutions, EE in Japan, Vol. 111, No. 3, pp. 69-79, 1991.




How to Cite

Qemali, M., Bualoti, R., & Çelo, M. (2014). Voltage Stability Analysis in the Albanian Power System. Asian Journal of Engineering and Technology, 2(2). Retrieved from https://ajouronline.com/index.php/AJET/article/view/1097