An Investigation of THD in 5-level NPC Multilevel Inverter Based on Multicarrier PWM Techniques

International Journal of Electrical and Electronics Engineering
© 2017 by SSRG - IJEEE Journal
Volume 4 Issue 8
Year of Publication : 2017
Authors : Pairote Thongprasri
How to Cite?

Pairote Thongprasri, "An Investigation of THD in 5-level NPC Multilevel Inverter Based on Multicarrier PWM Techniques," SSRG International Journal of Electrical and Electronics Engineering, vol. 4,  no. 8, pp. ):20-28, 2017. Crossref,


This paper presents an investigation of the Total Harmonic Distortion in 5-level neutral point clamped multilevel inverter using 4 strategies of multicarrier PWM techniques; Phase Disposition, Phase Opposition Disposition, Phase Opposition Disposition with different frequencies, and Alternative Phase Opposition Disposition. The signals of the controlled switches of the multilevel inverter based on 4 strategies of multicarrier PWM techniques created by a TMS320F28335 DSP controller are proposed in this paper. Experimental results by varying the modulation index (ma) in the range of 0.4 to 1, the lowest percentage of the THD of the system is produced when the multilevel inverter is controlled by the PD modulation technique. The %THDv and the %THDi are 9.3 and 9.6,respectively, when the proto-type of the multilevel inverter with a resistive load 50 Ω and an inductive load 8 mH is controlled by the PD modulation technique using ma = 0.9.


Neutral point clamped multilevel inver-ter, Multicarrier PWM techniques, Total harmonic distortion.


[1] Y. Xiaoming, I. Barbi, ―Fundamentals of a new diode clamping Multilevel Inverter, IEEE Transactions on Power Electronics, vol. 15, no. 4, pp. 711–718, July 2000.
[2] J. Rodriguez, J.S. Lai, and F.Z. Peng, N. Janjamraj, ―Multile-vel inverters: a survey of topologies, controls, and applica-tions, IEEE Transactions on Industrial Electronics, vol. 49, no. 4, pp. 724–738 August 2200.
[3] A. Oonsivilai, ―Review of Multilevel Converters/Inverters International Review of Electrical Engineering (IREE), vol. 8 no. 2, pp. 514–527, April 2013.
[4] S. Kjaer, J. Pedersen and F. Blaabjerg, ―A Review of Single Phase Grid-Connected Inverters for Photovoltaic Modules, IEEE Trans. on Industry Applications, vol. 41, no.5, pp. 1292-1306, Sep 2005.
[5] A. Radan, A.H. Shahirinia, and M. Falahi, ―Evaluation of carrier-based PWM methods for multi-level inverters, The International Conference on Industrial Electronics, pp. 389-394, 2007.
[6] R. Naderi and A. Rahmati, ―Phase-Shifted Carrier PWM Technique for General Cascaded Inverters, IEEE Tran-sactions on Power Electronics, vol. 23, no.3, pp. 1257-1269, May 2008.
[7] J.J. Mane, S.P. Muley, and M.V. Aware, ―Performance of 5-level NPC inverter with multi-multicarrier multi-modulation technique, The International Conference on Power Electro-nics, Drives and Energy Systems, pp. 1-5, 2012.
[8] C.R. Balamurugan, S.P. Natarajan, and R. Bensraj, ―Perfor-mance evaluation of unipolar PWM strategies for three phase five level diode clamped inverter, The International Con-ference on Emerging Trends in Science, Engineering and Technology, pp. 443-449, 2012.
[9] H. Zheng, B. Zhang, and L. Chen, ―Carrier overlapping–switching frequency optional PWM method for cascaded multilevel inverter, International Conference on Electrical and Control Engineering, pp. 3450-3453, 2010.
[10] N.A. Yusof, N.M. Sapari, H. Mokhlis, and J. Selvaraj, ―A comparative study of 5-level and 7-level multilevel inverter connected to the grid, International Conference on Power and Energy, pp. 542-547, 2012.