A Comparative Analysis of Modulation Control Strategies for Cascade H-Bridge 11-Level Inverter

Authors: Joshi Manohar. V., Sujatha. P., Anjaneyulu K. S. R

Abstract:

The range of the output power is a very important and evident limitation of two-level inverters. In order to overcome this disadvantage, multilevel inverters are introduced. Recently, Cascade H-Bridge inverters have emerged as one of the popular converter topologies used in numerous industrial applications. The modulation switching strategies such as phase shifted carrier based Pulse Width Modulation (PWM) technique and Stair case modulation with Selective Harmonic Elimination (SHE) PWM technique are generally used. NR method is used to solve highly non linear transcendental equations which are formed by SHEPWM method. Generally NR method has a drawback of requiring good initial guess but in this paper a new approach is implemented for NR method with any random initial guess. A three phase CHB 11-level inverter is chosen for analysis. MATLAB/SIMULINK programming environment and harmonic profiles are compared. Finally this paper presents a method at fundamental switching frequency with least % THDV.

Keywords: Cascade H-bridge 11- level Inverter, NR method, Phase shifted carrier based pulse width modulation (PSCPWM), Selective Harmonic Elimination Pulse Width Modulation (SHEPWM), Total Harmonic Distortion (%THDv).

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055617

References:

[1] Jose Rodriguez, J S Lai, and F. Z. Peng, "Multilevel Inverters: A Survey of Topologies, Controls, and Applications", IEEE Trans. Ind.Electron.., vol. 49, no. 4, pp. 724-738, August 2002.
[2] K.Gopa Kumar, A.Das, R.Ramchand,C.Patel, "A hybrid multilevel toplology for an open-end winding induction motor drive using two-level inverters in series with a capacitor fed H-bridge cell," IEEE Trans. Ind.Electron., Vol. 57, No. 11,pp. 3707-3714, Nov.2010.
[3] Fang Zheng Peng, Jih-Sheng Lai, et al, "A Multilevel Voltage-Source Inverter with Separate DC Sources for Static Var Generation", IEEETrans. Ind. Appl., vol. 32, no. 5, pp. 1130-1138, Sep/Oct. 1996.
[4] M.Malinowski, K. Gopakumar, J.Rodriquez, and M. A. Perez,"A survey on cascaded multilevel inverters," IEEE Trans. Ind.Electron., Vol. 57, No. 7,pp. 2197-2206, Jul. 2010.
[5] J.S.Lai, and F.Z.Peng "Multilevel converters - A new breed of converters," IEEE Trans. Ind.Appli., vol.32, no.3, pp.509-517. May/Jun.1996.
[6] Samir Kouro, S. La Rocca, B. Cortes, P. Alepuz, S. Bin Wu Rodriguez, J. "Predictive control based selective harmonic elimination with low switching frequency for multilevel converters" Energy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE, pp- 3130 - 3136.
[7] P.W. Hammond, "A new approach to enhance power quality for medium voltage AC drives," IEEE Trans. Ind.Appl., vol.33, no 1, pp202-208, Jan/Feb.1997.
[8] Bin Wu, "High -Power Converters and AC Drives". Piscataway,NJ: IEEE Press, 2006
[9] Leopoldo Garcia Franquelo, Javier Napoles"A Flexible Selective Harmonic Mitigation Technique to Meet Grid Codes in Three-Level PWM Converters," IEEE Trans. Ind. Electron., vol. 54, no. 6, pp 3022- 3029, Dec 2007.
[10] A.Tahri and A.Draou "A Comparative Modelling Study of PWM Control Techniques for Multilevel Cascaded Inverter" Leonardo Journal of Sciences, Issue 6, pp 42-58, Jan-Jun 2005.
[11] H. S. Patel and R. G. Hoft, "Generalized harmonic elimination and voltage control in thyristor inverters: Part IÔÇöHarmonic elimination," IEEE Trans.Ind. Appl., vol. IA-9, no. 3, pp. 310-317, May/Jun. 1973.
[12] H. S. Patel and R. G. Hoft, "Generalized harmonic elimination and voltage control in thyristor inverters: Part IIÔÇöVoltage control technique," IEEETrans. Ind. Appl., vol. IA-10, no. 5, pp. 666-673, Sep./Oct. 1974.