In a deregulated power market, the optimum power flow (OPF) for an interconnected grid system is an important concern as related to transmission loss and operating constraints of power network. The increased power transaction as related to increased demand and satisfaction of those demand to the competition of generation companies (GENCOs) are resulting the stress on power network which further causes the danger to voltage security, violation of limits of line flow, increase in the line losses, large requirement of reactive power, danger to power system stability and over load of the lines i. e. congestion of power in system. It can be managed by rescheduling of generators or optimal location of distributed generation (DG) at minimum cost with minimum loss without disturbing the operating constraints. This paper reviews some of congestion management (CM) methods including the nodal pricing method, differential evolution (DE), addition of renewable energy sources, extended quadratic interior point (EQIP) based OPF, mixed integer nonlinear programming, particle swarm optimization (PSO), cost free methods and Genetic Algorithm (GA). Each technique has its own significance and potential for promotion of rescheduling of generators in a deregulated power system.

1. S. M. H Nabavi, "Congestion Management using Genetic Algorithm in Deregulated Power Environments", International Journal of Computer Applications,Mar. 2011, Vol. 18, No. 2.
2. Sujatha Balaraman, "Application of Differential Evolution for Congestion Management in Power System", Canadian Center of Science and Education, Aug. 2010, Vol. 4, No. 8.
3. Randhir Singh, "Optimal Model of Congestion Management in Deregulated Environment of Power Sector with Promotion of Renewable Energy Sources", Renewable Energy 35, 2010, 1828–1836.
4. Elango. k, Paranjothi. S. R, "Congestion Management in Restructured Power Systems by Facts Devices and Load Shedding using Extended Quadratic Interior Point Method", International Journal of Applied Engineering Research, Dindigul, 2011, Vol. 2, No. 2.
5. Namrata Rao, "Congestion Management in Deregulated Power System using Facts Controller", International Journal of Engineering Research and General Science, 2014, Vol. 2, No. 6.
6. N. M. Rao, "Use of FACTS Controller for Relieving Congestion in Deregulated Power System", International Journal of Innovative Research and Studies, Nov. 2013.
7. Kanwardeep Singh, Vinod K. Yadav, Arvind Dhingra, "Congestion Management Using Optimal Placement of TCSC in Deregulated Power System", International Journal on Electrical Engineering and Informatics, 2012, Vol. 4, No. 4, 620-632.
8. S Balaraman, N Kamaraj, "Transmission Congestion Management using Particle Swarm Optimization", Journal of Electrical Systems, 2011, 54-70.
9. S. Thangalakshmi, P. Valsalal, "Congestion Management using Hybrid Fish Bee Optimization", Journal of Theoretical and Applied Information Technology, 2013, Vol. 58, No. 2, 405-412.
10. Ushasurendra, S. S Parathasarthy, "Congestion Management in Deregulated Power Sector using Fuzzy based Optimal Location Technique for Series Flexible Alternative Current Transmission System (FACTS) Device", Journal of Electrical and Electronics Engineering Research, 2012, Vol. 4, 12-20.
11. A. Ahamad, Jeelani Basha, M. Anitha, "Transmission Congestion Management in Restructured Power System using Firefly Algorithm", International Journal of Computer Applications,Jan. 2014, Vol. 85, No. 1.
12. N. Chidambararaj, K. Chitra, "A Combined Congestion Management Technique for Rescheduling of Optimal Active Power of Generator Units", Journal of Theoretical and Applied Information Technology, 2014, Vol. 67, No. 3.
13. G. Kumaravelan, N. Chidambararaj, K. Chitra, "Optimal Active Power Rescheduling of Generators for Congestion Management using New Definition of Sensitivity", International Journal of Emerging Technology in Computer Science & Electronics, Mar. 2015, Vol. 13, No. 1.
14. S. Vinod Kumar, J. Sreenivasulu, K. Vimala Kumar, "Genetic Algorithm based Congestion Management by using Optimal Power Flow Technique to Incorporate FACTS Devices in Deregulated Environment", International Journal of Innovative Research in Electrical, Electronics, Instrumentation and control Engineering, Dec. 2014, Vol. 2, No. 12.
15. Saibal K. Pal, C. S Rai, Amrit Pal Singh, "Comparative Study of Firefly Algorithm and Particle Swarm Optimization for Noisy Non-Linear Optimization Problems", I. J Intelligent Systems and Applications, 2012, 50-57.
16. Xin-She Yang and Xingshi He, "Firefly Algorithm: Recent Advances and Applications", Int. J. of Swarm Intelligence, 2013, Vol. 1, No. 1, 36-50.
17. N. Acharya, N. Mithulananthan, "Locating Series FACTS Devices for Congestion Management in Deregulated Electricity Markets", Electric Power System Research, 2007, 352-360.
18. A. Fattahi Meyabadi, H. Barati, M. Ehsan, "Simultaneous Congestion Management and Cost Allocation in Short-Run Market Model", Iranian Journal of Science and Technology, Transaction, Engineering, 2007, Vol. 31, No. B6, 617-628.
19. S Balaraman, N Kamaraj, "Congestion Management in Deregulated Power System using Real Coded Genetic Algorithm", International Journal of Engineering Science and Technology, 2010, Vol. 2, No. 11, 6681-6690.
20. G. Vinod Kumar, J. Srinivasa Rao, J. Amarnath, "Transmission Congestion Management by using Series FACTS Devices and Changing Participation Factors of Generators", International Journal of Modern Engineering Research, Jul-Aug 2013, Vol. 3, No. 4, 2111-2118.
21. I. Androcec, I. Wangensteen, "Different Methods for Congestion management and Risk management", 9th International Conference on Probabilistic Methods Applied to Power Systems, 2006, 11-15.
22. Yong Yoon, Ken Collison, Jose Acre, Marija D. llic, "Congestion Management System Methods: Comparison on the 118 Bus System", 32nd Annual North America Power Symposium, 2000.
23. G. Sophia Jasmine, P. Vijaya Kumar, "Congestion Management in Competitive Power Market using TCSC", ARPN Journal of Engineering and Applied Sciences, May 2015, Vol. 10, No. 9.
24. Yog Raj Sood, N. P Padhy, H. O Gupta, "Deregulated Model and Locational Marginal Pricing", Electric Power Systems Research, 2007, 574-582.
25. L. Rajalaxmi, M. V Sugnyadevi, S. Parameswari, "Congestion Management in Deregulated Power System by Locating Series FACTS Devices", International Journal of Computer Applications, 2011, Vol. 13, No. 8.
26. K. Vijayakumar, "Optimal Location of FACTS Devices for Congestion Management in Deregulated Power Systems", International Journal of Computer Applications, Feb. 2011, Vol. 16, No. 6.
27. B. V Manikandan, S. Charles Raja, P. Venkatesh, Manasarani Mandala, "Comparative Study of Two Congestion Management Methods for the Restructured Power Systems", Journal of Electrical Engineering & Technology, 2011, Vol. 6, No. 3, 302-310.
28. R. Saranya, K. Balamurugan, M. Karupasamypandiya, "Artificial Bee Colony algorithm based Congestion Management in Restructured Power System", Indian Journal of Science & Technology, Apr. 2015, Vol. 8, No. S7, 171-178.
29. Saber Izadpanah Tous, Somayeh Hasanpour, "Voltage Drop Compensation and Congestion Management by Optimal Placement of UPFC", International Journal of Automation and Power Engineering, 2012, 29-36.
30. Par Homberg, Ewa Lazarcyzk, "Congestion Management in Electricity Networks: Nodal, Zonal and Discriminatory Pricing", Electricity Policy Research Group, University of Cambridge, 2012.
31. Ashish Saini, A. K Saxena, "Optimal Power Flow based Congestion Management Methods for Competitive Electricity Markets", International Journal of Computer and Electrical Engineering, 2010, Vol. 2, No. 1.
32. Kunal M. Lokhande, Vinod G. Bhogande, Subroto Dutt, "Transmission Congestion Management in Restructured Power Systems", International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, Jul. 2015, Vol. 4, No. 7.
33. Bin Liu, Jixin Kang, Nan Jiang, Yuanwei Zing, "Cost Control of the Transmission Congestion Management in Electricity Systems based on Ant Colony Algorithm", Energy and Power Engineering, 2011, 17-23.
34. Tulika Bhattacharjee, Ajoy Kumar Chakraborty, "Congestion Management in a Deregulated Power System by Rescheduling of Sensitive Generators and Load Curtailment using PSO",International Journal of Emerging Technology & Advanced Engineering, 2012, Vol. 2, No. 3.
35. S. Nandini, P. Suganya, K Muthulakshmi, "Congestion Management in Transmission Lines Considering Demand Response and FACTSDevices", International Journal of Innovative Research in Science, Engineering and Technology, 2014, Vol. 3, No. 1.
36. N S Modi, B R Parekh, "Transmission Network Congestion in Deregulated Wholesale Electricity Market",In Proceedings of the International Multi Conference of Engineers and Computer Scientists, 2009, Vol. 2.
37. Hamed Ahmadi, Mojtaba Khanbadi, Hassan Ghasemi, "Transmission System Reconfiguration for Congestion Management Ensuring Transient and Voltage Stability", EEEIC Conference, 2013.
38. Abhishek Saxena, Dr. Seema N. Pandey, Dr. Laxmi Srivastava, "Congestion Management in Open Access: A Review", International Journal of Science, Engineering and Technology Research, 2013, Vol. 2.
39. Ettore Bompard, Pedro Correia, George Gross and Mikael Amelin, "A Comparative Analysis of Congestion Management Schemes under a Unified Framework", Stockholm, Sweden, 2010.
40. N. M. Pindoriya, S. N. Singh, K. Y. Lee, "A Comprehensive Survey on Multi-objective Evolutionary Optimization in Power System Applications," IEEE Power and Energy Society General Meeting,Jul. 2010, 1-8.
41. M. Khanabadi, H. Ghasemi, M. Doostizadeh, "Optimal Transmission Switching Considering Voltage Security and N-1 Contingency Analysis," IEEE Transactions onPower Systems, Feb. 2013, Vol. 28, No. 1,542-550.
42. B. R. Sathyanarayana, G. T. Heydt, "Sensitivity-Based Pricing and Optimal Storage Utilization in Distribution Systems," IEEE Transactions onPower Delivery,Apr. 2013, Vol. 28, No. 2,1073-1082,.
43. S. Deb, A. K. Goswami, "Congestion Management by Generator Rescheduling using Artificial Bee Colony Optimization Technique," In Proceeding of IEEE Conference, Dec. 2012, 909-914.
44. Sen Sawan, S. Chanda, S. Sengupta, A. Chakrabarti, "An Evolutionary Algorithm for Consumer Welfare Optimisation of a Contingent Power Network," In Proceeding of IEEE Conference in Recent Advances in Intelligent Computational Systems,Sep. 2011, 504-508.
45. R. S. Wibowo, N. Yorino, Y. Zoka, Y. Sasaki, M. Eghbal,"Optimal Location And Control of FACTS Devices for Relieving Congestion and Ensuring Voltage Stability," In Proceeding of IEEE Conference,Nov. 2010, 539-544.
46. S. S. Reddy, M. S. Kumari, M. Sydulu, "Congestion Management in Deregulated Power System by Optimal Choice and Allocation of FACTS Controllers using Multi-objective Genetic Algorithm," IEEE Transmission and Distribution Conference And Exposition, Apr. 2010, 1-7.
47. T. D. Mount, "Modeling Nodal Prices in Deregulated Electricity Markets in the USA- Current Practices And Future Needs," In Proceeding of IEEE International Conference onAcoustics, Speech and Signal Processing, May 2011,5944-5947.
48. M. Afkousi-Paqaleh, A. Abbaspour-Tehranifard, M. Rashidinejad, K. Y. Lee,"Optimal Placement and Sizing of Distributed Resources for Congestion Management Considering Cost/Benefit Analysis," IEEE Power And Energy Society General Meeting, Jul. 2010, 1-7.
49. M. Joorabian, M. Saniei, H. Sepahvand, "Locating and Parameters Setting of TCSC for Congestion Management in Deregulated Electricity Market," In Proceeding of 6th IEEE Conference on Industrial Electronics and Applications,Jun. 2011, 2185-2190.
50. S. P. Karthikeyan, S. K. Sahoo, R. Roopesh, S. Mathur, I. J. Raglend, D. P. Kothari, "Utilizing FACTS Devices in Enhancement of Market Power under Congestion-A Threat to the Deregulated Electricity Market," In Proceeding of IEEE Conference,2012, 299-303.
51. S. Chanda, A. De,"Application of Particle Swarm Optimisation for Relieving Congestion In Deregulated Power System," In Proceeding of IEEE Conference in Recent Advances in Intelligent Computational Systems,Sep. 2011,837-840.

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