Information Technology Journal 1812-5638 1812-5646 Asian Network for Scientific Information 10.3923/itj.2013.2366.2373 Xie Hui Li Hongbing Liu Heping Chen Qiang 12 2013 12 12 The output voltage of the Sinusoidal Pulse Width Modulation (SPWM) inverter contains various ultra harmonics. It increases the system’s power consumption and generates the harmonic interference. By establishing the mathematical model of the three-phase inverter and doing the FFT transformation on the output voltage, it analyses the relation between the output voltage and the combined conduction states of the inverter’s switches during one waveform cycle, it also analyzes the main parameters, modulation ratio of the voltage and carrier signal which can affect the inverter’s harmonic content. Simulation verifies the distribution regularities of each harmonic of SPWM inverter’s output voltage. It indicates that SPWM modulation method can make the output harmonics high frequency, the harmonic characteristic and modulation depth are closely related to the carrier frequency. This study has great significance on the rational selection of modulation depth and carrier frequency, improvement of the inverter’s efficiency and reduction of harmonic distortion.

]]> Zhang, K., Y. Kang, J. Xiong and J. Chen, 2003 IEEE Trans. Power Electron., 18 784 792 Mohan, D.M., B. Singh and K.B. Panigrahi, 2008 Proceedings of the IEEE International Conference on Sustainable Energy Technologies, 2008 pp: 372 377 Trzynadlowski, A.M., K. Borisov, Y. Li, L. Qin and Z. Wang, 2004 IEEE Trans. Power Electron., 1 67 71 Deng, H., R. Oruganti and D. Srinivasan, 2005 IEEE Power Electron. Lett., 3 1 6 Escobar, G., A.A. Valdez, J. Leyva-Ramos and P. Mattavelli, 2007 IEEE Trans. Ind. Electron., 54 504 510 Sun, C., Z. Bi and G. Wei, 2004 Proc. CSEE Chin., 24 124 130 Cherchali, N.O., A. Tlemcani, M.S. Boucherit and L. Barazane, 2011 Energy Power Eng., 3 276 284 Dai, K., J. Wang, R. Chen, J. Chen and Y. Kang, 2012 Trans. China Electrotech. Soc. Chin., 27 82 88 Shi, K.L. and L. Hui, 2005 IEEE Trans. Ind. Electron., 52 1458 1461 Hu, X. and G. Tan, 2009 Proc. CSEE Chin., 29 43 47 Sun, P., C. Liu, J.S. Lai, C.L. Chen and N. Kees, 2012 IEEE Trans. Power Electron., 27 1159 1167 Xu, A. and S. Xie, 2009 Proc. CSEE Chin., 29 34 39 Bowes, S.R. and D. Holliday, 2007 IEEE Trans. Ind. Electron., 54 1547 1559