A Coherency-Based Equivalent Model of a Large Scale Wind Farm

Abstract:

With increasing installation capacity and wind farms penetration, wind power plays more important role in power systems, and the modeling of wind farms has become an interesting research topic. In this paper, a coherency-based equivalent model has been discussed for the doubly fed induction generator (DFIG). Firstly, the dynamic models of wind turbines, DFIG and the mechanisms are briefly introduced. Some existing dynamic equivalent methods such as equivalent wind model, variable speed wind turbine model, parameter identification method and modal equivalent method to be used in wind farm aggregation are discussed. Then, considering wind power fluctuations, a new equivalent model of a wind farm equipped with doubly-fed induction generators is proposed to represent the interactions of the wind farm and grid. The method proposed is based on aggregating the coherent group wind turbines into an equivalent one. Finally, the effectiveness of the equivalent model is demonstrated by comparison with the wind farm response obtained from the detailed model. The dynamic simulations show that the present model can greatly reduce the computation time and model complexity.

• Periodical: Advanced Materials Research (Volumes 347-353)
• Pages: 2342-2346
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.347-353.2342
• Online since: October 2011
• Authors: Rong Fu, Bao Yun Wang, Wan Peng Sun
• Keywords: Clustering, Coherency-Based Equivalent Model, Double Fed Induction Generation (DFIG), Wind Farm

References

[1] LI J L, XU H H. Low Voltage Operation Technology of Wind Power Systems. Machine Press, January 2009.

[2] Muljadi E，Butterfield C P. Wind farm power system model development. World Renewable Energy Congress Ⅷ，Denver，Colorado，2004:1-9.

[3] Muljadi E，Butterfield C P，Ellis A. Equivalencing the collector system of a large wind power plant. IEEE PES 2006 General Meeting, 2006:1-9.

DOI: 10.1109/pes.2006.1708945

[4] Tapia G, Tapia A, Ostolaza J X. Two alternative modeling approaches for the evaluation of wind farm active and reactive power performances. IEEE Trans. on Energy Conversion; vol 21,2006: 989-1000.

DOI: 10.1109/tec.2005.859975

[5] Lei W, Meir K, Solomon Y, Prabha K. Dynamic reduction of large power systems for stability studies. IEEE Trans. on Power Systems; vol. 12, 1997: 889-895.

DOI: 10.1109/59.589749

[6] Larbi O M, Louis A D, Van Q D. Dynamic equivalent modeling of large power systems using structure preservation technique. IEEE Trans. on Power Systems; vol. 21, 2006: 1284-1295.

DOI: 10.1109/tpwrs.2006.876699

[7] Perdana A, Sanna U J, Ola C. Comparison of an aggregated model of a wind farm consisting of fixed-speed wind turbines with field measurement. Wind Energy, 2008.

DOI: 10.1002/we.251

[8] Fernández L M, García C A, Saenz J R. Equivalent models of wind farms by using aggregated wind turbines and equivalent winds. Energy Conversion and Management, vol.50,2009:691-704.

DOI: 10.1016/j.enconman.2008.10.005