Optimal Placement and Sizing of SVC for Load Margin Improvement Using BF Algorithm

Power systems are operating under stressed condition
due to continuous increase in demand of load. This can lead to
voltage instability problem when face additional load increase or
contingency. In order to avoid voltage instability suitable size of
reactive power compensation at optimal location in the system is
required which improves the load margin. This work aims at
obtaining optimal size as well as location of compensation in the 39-
bus New England system with the help of Bacteria Foraging and
Genetic algorithms. To reduce the computational time the work
identifies weak candidate buses in the system, and then picks only
two of them to take part in the optimization. The objective function is
based on a recently proposed voltage stability index which takes into
account the weighted average sensitivity index is a simpler and faster
approach than the conventional CPF algorithm. BFOA has been
found to give better results compared to GA.

• Santi Behera
• M. Tripathy
• J. K. Satapathy

• BFOA
• GA
• SSVSL
• WASI.

[1] T. V. Cutsem, and C. Vournas, “Voltage Stability of Electric Power
Systems”, Norwell, M. A. Kuwer, 1998.
[2] Zhihong Feng, Venkataramana Ajjarapu, and Dominic J. Maratukulam,
“A Comprehensive Approach for Preventive and Corrective Control to
Mitigate Voltage Collapse”, IEEE Ttrans, Power Systems, vol. 15, no. 2,
May 2000. pp. 791-797.
[3] Fernando L. Alvarado, Jianping Meng, Christopher L. De Marco, and
Wellington S. Mota, “Stability Analysis of Interconnected Power
Systems Coupled with Market Dynamics", IEEE Trans. Power Systems,
vol. 16, no. 4, Nov. 2001 pp. 695-701.
[4] M. V. Reddy, Yemula Pradeep, V. S. K. Murthy Balijepalli, S.A.
Khaparde, and C. V. Dobaria, “Improvement of Voltage Stability Based
on Static and Dynamic Criteria”, in Proceedings of 16th National Power
Systems Conference, 15th-17th Dec, 2010, pp.715
[5] Kundur P, Power System Stability and Control, McGraw-Hill, 1994
[6] Shraddha Udgir, Sarika Varshney, and Laxmi Srivastava, “Optimal
Placement and Sizing of SVC for Voltage Security Enhancement”,
International Journal of Computer Applications, vol 32, no.6, October
2011, pp. 44-51.
[7] Zhihong Feng, Venkataramana Ajjarapu, and Dominic J. Maratukulam,
“A Comprehensive Approach for Preventive and Corrective Control to
Mitigate Voltage Collapse”, IEEE Trans. Power Systems, vol. 15, no. 2,
May 2000, pp.791-797.
[8] M. Nanba, Y. Huang, T. Kai and S. Iwamoto, “Studies on VIPI based
control methods for improving voltage stability”, Electrical Power &
Energy Systems, vol. 20, no. 2, 1998, pp. 141–146.
[9] D. Thukaram, and Abraham Lomi, “Selection of static VAR
compensator location and size for system voltage stability
improvement,” Electric Power Systems Research, vol. 54, 2000, pp.
139–150.
[10] Wei Yan, Juan Yu, David C. Yu, and Kalu Bhattarai, “A New Optimal
Reactive Power Flow Model in Rectangular Form and its Solution by Predictor Corrector Primal Dual Interior Point Method”, IEEE Trans.
Power Systems, vol. 21, no. 1, Feb. 2006, pp. 61-67.
[11] Kenji Iba, “Reactive Power Optimization by Genetic Algorithm”, IEEE
Trans. Power Systems, vol. 9, no. 2, May 1994, pp. 685-691.
[12] M. Kowsalya, K. K. Ray and D. P. Kothari, “Loss Optimization for
Voltage Stability Enhancement Incorporating UPFC Using Particle
Swarm Optimization”, Journal of Electrical Engineering & Technology,
vol. 4, 2009, pp.492- 498.
[13] M. Tripathy, and S. Mishra, “Bacteria Foraging based solution to
optimize both real power loss and voltage stability limit”, IEEE Trans.
Power Systems, vol. 22, no. 1, Feb. 2007, pp. 240-248.
[14] K. M. Passino, “Biomimicry of bacterial foraging for distributed
optimization and control”, IEEE Control System, June-2002, pp.52-67.