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**ABSTRACT**

the present paper aims to design an active power filter (APF) for harmonic mitigation of grid-connected wind turbine (WT). The wind energy conversion system (WECS) consists of permanent magnet synchronous generator (PMSG) driven by a variable-speed WT. The output of the PMSG is connected to a direct three phase AC/AC matrix converter (MC) to interface the system with the distribution grid. The MC controls the wind maximum power point tracking (MPPT) using perturbation and observation (P&O) method. The MC output current harmonics and non-linear load current harmonics are compensated by the proposed shunt (APF) based on d-q theory. The system under study is simulated using MATLAB/SIMULINK platform. The digital results show that, the proposed system is not only capable of delivering extracted wind power to the power system without currents/voltages harmonic distortion at grid side, but it can also satisfactorily eliminate harmonic currents which are drawn by non-linear load. The system dynamic performance is investigated under different wind speed and loading conditions. The system responses prove that the system works significantly irrespective of wind speed values and demanded load. Therefore the power quality in terms of grid current waveform, total harmonic distortion (THD) factor; frequency spectrum and system power factor is improved within permissible standard values as defined by IEEE-519.

**KEYWORDS**

active power filter, grid connected system, harmonics mitigation, matrix converter, permanent magnet synchronous generator, power quality, and wind energy conversion system.

**REFERENCES**

[1] Pallagiri Venkata Dinesh Reddy, S. Chandra mouli, “Hybrid Renewable Energy Sources Based Four Leg Inverter for Power Quality Improvement”, International Journal of Advanced Technology and Innovative Research, Volume.07, No.06, pp.1092-1098, July-2015.

[2] Sudheer Kasa, P. Ramanathan, S.amasamy , D.P. Kothari; “ Effective grid interfaced renewable sources with power quality improvement using dynamic active power filter”, Proceedings of Electrical Power and Energy Systems 82, pp.150–160, 2016.

[3] Senthilkumar. A ,Poongothai. K, Selvakumar. S, Silambarasan. Md, P. Ajay-D-VimalRaj “Mitigation of Harmonic Distortion in Microgrid System using Adaptive Neural Learning Algorithm based Shunt Active Power Filter ” SMART GRID Technologies, Procedia Technology 21, PP.147-154, August 2015.

[4] H. H. Tumbelaka, Lawrence J. Borle, Chemmangot V. Nayar and Seong Ryong Lee, "A Grid Current Controlling Shunt Active Power Filter", Journal of Power Electronics, Vol. 9, No. 3, May 2009.

[5] Sajid Hussain Qazi, Mohd Wazir Mustafa,“ Review on active filters and its performance with grid connected fixed and variable speed wind turbine generator” Renewable and Sustainable Energy Reviews, Science Direct 57, pp. 420–438, 2016.

[6] H. H. Tumbelaka, C. V. Nayar, K. Tan, and L. J. Borle, "Active filtering applied to a line-commutated inverter fed permanent magnet wind generator", International Power Engineering Conference IPEC2003,Singapore, 2003.

[7] Oğuz Y,Güney İ, Çalık H. "Power quality control and design of power converter for variable-speed wind energy conversion system with permanent- magnet synchronous generator".Sci-World-July; 2013:1–14, 2013.

[8] Phan V-T,Lee H-H. "Control strategy for harmonic elimination in stand-alone DFIG applications with nonlinear loads". IEEE Trans. Power Electron; 26: 2662–75, 2013.

[9] E. Hau, "Wind Turbines: Fundamentals, Technologies, Application, Economics", 2nd edition. Berlin, Germany: Springer, 2006.

[10] Q. Wang and L. Chang, "An intelligent maximum power extraction algorithm for inverter-based variable speed wind turbine systems," Power Electronics, IEEE Transactions on, vol. 19, pp. 1242-1249, 2004.

[11] M. Abdullah, A. Yatim, C. Tan, and R. Saidur, "A review of maximum power point tracking algorithms for wind energy systems," Renewable and Sustainable Energy Reviews, vol. 16, pp. 3220-3227, 2012.

[12] A. Mahdi, W. Tang, and Q. Wu, "Estimation of tip speed ratio using an adaptive perturbation and observation method for wind turbine generator systems," in Renewable Power Generation (RPG 2011), IET Conference on , pp. 1-6, 2011.

[13] J. S. Thongam and M. Ouhrouche, "MPPT control methods in wind energy conversion systems," Fundamental and Advanced Topics in Wind Power, pp. 339-360, 2011.

[14] D. Casadei, G. Grandi, G. Serra, and A. Tani, "Space vector control of matrix converters with unity input power factor and sinusoidal input/output waveforms," in Power Electronics and Applications, 1993., Fifth European Conference on, pp. 170-175, 1993.

[15] P. W. Wheeler, J. Rodriguez, J. C. Clare, L. Empringham, and A. Weinstein, "Matrix converters: a technology review," Industrial Electronics, IEEE Transactions on, vol. 49, pp. 276-288, 2002.

[16] A. Alesina and M. Venturini, "Solid-state power conversion: A Fourier analysis approach to generalized transformer synthesis," Circuits and Systems, IEEE Transactions on, vol. 28, pp. 319-330, 1981.

[17] A. Alesina and M. Venturini, "Analysis and design of optimum-amplitude nine-switch direct AC-AC converters," Power Electronics, IEEE Transactions on, vol. 4, pp. 101-112, 1989.

[18] J. Rodriguez, M. Rivera, J. W. Kolar, and P. W. Wheeler, "A review of control and modulation methods for matrix converters," IEEE Transactions on Industrial Electronics, vol. 59, pp. 58-70, 2012.

[19] J. Rodriguez, E. Silva*, F. Blaabjerg, P. Wheeler, J. Clare, and J. Pontt, "Matrix converter controlled with the direct transfer function approach: analysis, modelling and simulation," International journal of electronics, vol. 92, pp. 63-85, 2005.

[20] L. Zhang, C. Watthanasarn, and W. Shepherd, "Control of AC-AC matrix converters for unbalanced and/or distorted supply voltage," in Power Electronics Specialists Conference, 2001. PESC. 2001 IEEE 32nd Annual, pp. 1108-1113, 2001.

[21] M. Y. Lee, P. Wheeler, and C. Klumpner, "Space-vector modulated multilevel matrix converter," Industrial Electronics, IEEE Transactions on, vol. 57, pp. 3385-3394, 2010.

[22] R. S. Herrera and P. Salmerón, "Instantaneous Reactive Power Theory: A Reference in the Nonlinear Loads Compensation", IEEE Transactions on Industrial Electronics, Vol. 56, No. 6, pp. 2015-2022, June 2009.

[23] A. Eid, M. Abdel-Salam, H. El-Kishky, T. El-Mohandes, “Active power filters for harmonic cancellation in conventional and advanced aircraft electric power systems”, "Electric Power Systems Research", 2008.

[24] D. –H. Chen and S. –J. Xie, “Review of Control Strategies Applied to Active Power Filters,” Proceedings of the IEEE International Conference on Electric Utility Deregulation, Restructuring and Power Technologies (DRPT), Hong Kong, pp. 666-670, 2004.

**Cite this paper**

Mohamed Amin M.a. Moftah, El-noby A. Ibrahim, Gaber El-saady A. Taha. (2017) Active Power Filter for Variable-Speed Wind Turbine PMSG Interfaced to Grid and Non-linear Load via three Phase Matrix Converter. *International Journal of Renewable Energy Sources, ***2**, 86-94

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