Advanced Pulse Width Modulation Techniques for Z Source Multi Level Inverter

This paper proposes five level diode clamped Z source
Inverter. The existing PWM techniques used for ZSI are restricted for
two level. The two level Z Source Inverter have high harmonic
distortions which effects the performance of the grid connected PV
system. To improve the performance of the system the number of
voltage levels in the output waveform need to be increased. This
paper presents comparative analysis of a five level diode clamped Z
source Inverter with different carrier based Modified Pulse Width
Modulation techniques. The parameters considered for comparison
are output voltage, voltage gain, voltage stress across switch and total
harmonic distortion when powered by same DC supply. Analytical
results are verified using MATLAB.

• B. M. Manjunatha
• D. V. Ashok Kumar
• M. Vijay Kumar

• Diode Clamped
• Pulse Width Modulation
• total harmonic distortion
• Z Source Inverter.

[1] J. H. Park “A Control Strategy for the Grid-connected PV System Using a Z-Source Inverter,” 2nd IEEE International Conference on Power and Energy (PECon 08), December 1-3, 2008, Johor Baharu, Malaysia. [2] F. Z. Peng, “Z source Inverter,” IEEE Trans. Ind. Appl., vol. 39, pp.
504-510, March/April 2003.
[3] S. Thangaprakash, A. Krishnan, “Comparative evaluation of modified
pulse width modulation schemes of Z-source inverter for various applications & demands,” International journal of Engineering, Science and Technology, Vol. 2, No. 1, 2010, pp. 103-115. [4] K. Janardhana, P. Agarwal “Performance Analysis of Different PWM control for Three-Phase Z-Source Inverter,” UACEE international journal of advancement in Electronics and Electrical engineering vol. 1, No. 1. [5] P. C. Loh, F. Blaabjerg, and C. P. Wong, "Comparative evaluation of pulse width modulation strategies for Z-source neutral-point-clamped inverter," IEEE Trans. Power Electron., vol. 22, no. 3, pp. 1005-1013,May 2007. [6] P. C. Loh, F. Gao, F. Blaabjerg, S. Y. Feng, and K. N. Soon, "Pulse Width Modulated Z-source neutral-point-clamped inverter," IEEE Trans. Ind. Appl., vol. 43, no. 5, pp. 1295-1308, Sep./Oct. 2007. [7] Miaosen Shen and Peng.F.Z, “Operation Modes and Characteristics of the Z-source Inverter with small inductance”, IEEE Trans. Ind. Appl., Vol. 55, No.1, pp. 89-96, Jan., 2008. [8] P. C. Loh, S. W. Lim, F. Gao, and F. Blaabjerg, "Three-level Z-source Inverters using a single LC impedance network," IEEE Trans. Power Electron., vol. 22, no. 2, pp. 706-711, Mar. 2007.