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Power Flow and Modal Analysis of a Power System Including Unified Power Flow Controller

Authors: Djilani Kobibi Youcef Islam, Hadjeri Samir, Djehaf Mohamed Abdeldjalil


The Flexible AC Transmission System (FACTS) technology is a new advanced solution that increases the reliability and provides more flexibility, controllability, and stability of a power system. The Unified Power Flow Controller (UPFC), as the most versatile FACTS device for regulating power flow, is able to control respectively transmission line real power, reactive power, and node voltage. The main purpose of this paper is to analyze the effect of the UPFC on the load flow, the power losses, and the voltage stability using NEPLAN software modules, Newton-Raphson load flow is used for the power flow analysis and the modal analysis is used for the study of the voltage stability. The simulation was carried out on the IEEE 14-bus test system.

Keywords: FACTS, load flow, modal analysis, UPFC, voltage stability.

Digital Object Identifier (DOI):

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[1] N. Ramesh, P. Rajalakshmi, “Voltage Stability Assessment of Large Power Systems and Identification of Weakest Buses”, Electronic copy available at:, accessed June 2015.
[2] S. Shirisha, P. Prasanna, N. Siva,” Evaluation of Modal Analysis for Voltage Stability using Artificial Immune Systems”, International Journal of Computer Applications, vol.46, no.9, pp. 6-10, 2012.
[3] B. Dorin, “Steady-State Analysis of Voltage Stability by Reactive Participation Factor”, Proc. Int. Conf. Interdisciplinarity in Engineering International 6th edition, “Petru Maior” University of Tîrgu Mures, Romania, pp. 260-265, 2012.
[4] K. Djilani, S. Hadjeri, M. Djehaf, “Study of UPFC Optimal Location Considering Loss Reduction and Improvement of Voltage Stability and Power Flow”, Leonardo Journal of Sciences, vol.24, no.1, pp.85-100, 2014.
[5] H. Khazali, M. Kalantar, “Optimal reactive power dispatch based on harmony search algorithm”, International Journal of Electrical Power & Energy Systems, vol33, no.3, pp.684–692, 2011.
[6] H. Raoufi, M. Kalantar, "Reactive power rescheduling with generator ranking for voltage stability improvement”, Energy Conversion and Management, vol50, no.4, pp.1129–1135, 2009.
[7] J. Rahul, P. Rajendra, S. Kunal, L. Jaswantsing, and B. Shailesh, “Flexible AC Transmission Systems”, International Journal of Computer Applications, vol. 1, no.15, pp.54-57, 2010.
[8] B. Kumar, M. Kumar, N. Srikanth, Y. Sekhar, “Optimization of UPFC Location and Capacity to Improve the Stability using ABC and GSA Algorithm”, Proc. Int. Conf Power and Energy (PECI), Champaign, IL, pp. 1-7, 2015.
[9] N. Hingorani, L. Gyugyi, “Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems”. New York, NY, USA: IEEE Press, 2000.
[10] K. Manas, R. Subhransu, “Data-Mining-Based Intelligent Differential Relaying for Transmission Lines Including UPFC and Wind Farms”, IEEE Transactions on Neural Networks and Learning Systems, early access from IEEExplore at: articleDetails.jsp?arnumber=7064892&filter%3DAND(p_IS_Number% 3A7064874) , accessed June 2015.
[11] K. Manoz, “Improving the Dynamic and Transient Stability of the Network by the Unified Power Flow Controller (UPFC)”, International Journal of Scientific and Research Publications, vol. 2, no.5, pp.1-6, 2012.
[12] K. Djilani, S. Hadjeri, M. Djehaf, “Independent Power Flow Control and Dynamic Performance Enhancement by the UPFC”, Proc. Int. Conf. on Electrical and Information Technologies ICEIT'15, Marrakech, Morocco, 2015.
[13] M. Noroozian, L. Angquist, M. Ghandhari, G. Anderson, “Use of UPFC for optimal power flow control”, IEEE Trans. Power Deliv. vol.12, no. 4, pp.1629–1634, 1997.
[14] S. Kamel, F. Jurado, J. Peças, “Comparison of various UPFC models for power flow control”, Electric Power Systems Research, vol.121, pp.1-9, 2014.
[15] Ch. Chengaiah, G. Marutheswar and R. Satyanarayana, “Control Setting of Unified Power Flow Controller through Load Flow Calculation”, ARPN Journal of Engineering and Applied Sciences, vol. 3, no. 6, pp. 6- 10, 2008.
[16] B. Gao, G. Morison and P. Kundur, “Voltage Stability Evaluation Using Modal Analysis”, IEEE Trans. On Power Systems, vol. 7, no. 4, pp.1423-1543, 1992.
[17] F. Enemuoh, J. Onuegbu and E. Anazia, “Modal Based Analysis and Evaluation of Voltage Stability of Bulk Power System”, vol. 6, no. 12, pp. 71-79, 2013.
[18] G. Verghes, I. Perez-Arriaga and F. Schwwppe, “Selective modal Analysis with Application to Electric Power Systems”, Part 11 IEEE trans, on Power App. and system, vol. 101, no. 9, pp. 3117-3134, 1982.
[19] V. Ajjarapu, B. Lee, Bibliograph on voltage Stability, IEEE Trans. on Power Systems, vol. 13, pp.115- 125, 1998.
[20] F. Alvarado, I. Dobson, S. Greene, “Contingency Ranking for Voltage Collapse via sensitivities from a single nose curve”, IEEE Transactions on Power Systems, vol.14, no. 1, pp.232-240, 1999.
[21] V. Balamourougan, S. Sachdev, S. Sidhu, “Technique for online prediction of voltage collapse”, IEEE Proceedings Generation Transmission and Distribution, vol. 151, no.4, pp.453-460, 2004.
[22] C. Sharma, G. Marcus, Determination of Power System Voltage Stability Using Modal Analysis, Proc. Int. Conf. on Power Engineering, Energy and Electrical Drives, Setubal, Portugal, pp. 381 – 387, 2007.