Problem of power quality is quite severe in wind energy conversion systems using induction generators. For power generation from wind induction generator are found to be the most appropriate choice. Major problem is seen in voltage profile and frequency deviations with changing natural conditions such as wind speed and variation in load. The transient response is actually a critical dynamic characteristic of doubly fed induction generator-based wind turbines, especially in the presence of fast transient events, such as, fault in power system. This paper presents a comparative study of stabilizing a DFIG (Doubly Fed Induction Generators) based wind farm using its own frequency converters and using a STATCOM (Static Synchronous Compensator) during wind speed change and grid fault. Simulation results show that for dynamic reactive power compensation, when, STATCOM is a used at a point of interconnection of wind farm and the network, the system absorbs the generated wind reactive power while maintaining its voltage level.

1. Dianguo Xu, Rui Li, Yicheng Liu, Yongqiang Lang, "Reactive power analysis and control of doubly fed induction generator wind farm", IEEE, 13th European Conference on Power Electronics and Applications, 2009, pp. 1 – 10
2. Renewable Energy Akshay Urja, Volume 6, Issue 5 & 6, June 2013, Newsletter of the Ministry Of New And Renewable Energy, Government Of India
3. L. Xu and P. Cartwright "Direct active and reactive power control of DFIG for wind energy generation", IEEE Trans. Energy Convers. , 2006, vol. 21, no. 3, pp. 750 -758 .
4. Erlich, H. Wrede and C. Feltes, "Dynamic Behaviour of DFIG- Based Wind Turbine During Grid Faults", IEEJ Trans. Vol. 128, No 4, pp. 396, 2008.
5. Molinas M, Suul J. A. , Undeland T, "A simple method for analytical evaluation of LVRT in wind energy for induction generators with STATCOM or SVC" IEEE, Power Electronics and Applications, 2007 European Conference, 2007, pp. 1 – 10.
6. A. D Hasan, G. Michalke, "Fault ride-through capability of DFIG wind turbines", Renewable Energy Vol. 32, pp. 1594-1610, 2007.
7. D. Santos-Martins, S. Arnaltes, J. L. Rodriguez Amenedo, "Reactive power capability of doubly fed asynchronous generators", Electric power systems research, Vol. 78, pp. 1837-1840, 2008.
8. Jingmei Fang, Gengyin Li, Xuefeng Liang, Ming Zhou, "An optimal control strategy for reactive power in wind farms consisting of VSCF DFIG wind turbine generator systems", IEEE, Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2011, 4th International Conference, July 2011, pp. 1709 – 1715.
9. Masaud, T, Sen P. K, "A comparative study of the implementation of STATCOM and SVC on DFIG-based wind farm connected to a power system" , Power and Energy Society General Meeting, 2012, IEEE, pp. 1-6.
10. Guowei Cai, Qi Sun, Cheng Liu, Pengfei Li, "A new control strategy to improve voltage stability of the power system containing large-scale wind power plants", IEEE, 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2011, Weihai, Shandong pp. 1276 – 128.
11. S. Santos, H. T. Le, "Fundamental time-domain wind turbine models for wind power studies", Renewable Energy, Vol. 32, pp. 2436-2452, 2007.
12. B. H. Chowdhury, S. Chellapilia, "Doubly-fed induction generator control for variable speed wind power generation", Electric Power System Research, Vol. 76, pp. 786-800, 2006.
13. H. Karim-Davijani, A. Sheikjoleslami, H. Livani and M. Karimi- Davijani, "Fuzzy Logic Control of Doubly Fed Induction generator Wind Turbine", World Applied Science Journal, Vol. 6, No. 4, pp. 499-508, 2009.
14. Sun, Z. Chen and F. Blaabjerg, «Transient Stability of DFIG Wind Turbines at an External Short Circuit Fault», Wind Energy Journal, Vol. 8, pp. 345-360, 2005.
15. Y. Zou , M. Elbuluk and Y. Sozer "A complete modeling andsimulation of induction generator wind power systems", Proc. IEEE Ind. Appl. Soc. Annu. Meeting, pp. 1 -8, 2010
16. Enrique Santacana, Gary Rackliffe,Le tang, and Xiaoming,"Getting Smart", IEEE power & energy magazine, April. 2010.
17. A. Tapia, G. Tapia, J. X. Ostolaza, and J. R. Saenz, "Modeling And Control Of A Wind Turbine Driven Doubly Fed Induction Generator," IEEE Trans. Energy Conversion, Vol. 18, No. 2, June. 2003, pp. 194-204.
18. A. Adamczyk, R. Teodorescu, R. N. Mukerjee, and P. Rodriguez, "Overview of facts devices for wind power plants directly connected to the transmission network," IEEE International Symposium on Industrial Electronics (ISIE), pp. 3742-3748, 2010.

Wind Energy Dfig Power Quality Smart Grid Statcom