Selective Harmonic Mitigation Technique for High Power Converters
Napoles, J; Leon, J. I.; Portillo, R; Franquelo, L. G.; Aguirre, M. A.
Industrial Electronics, IEEE Transactions on
Volume PP, Issue 99, 0 Page(s):1 - 1
Digital Object Identifier 10.1109/TIE.2009.2026759
Summary:In high power applications the maximum switching frequency is limited due to thermal losses. This leads to highly distorted output waveforms. In such applications, it is necessary to filter the output waveforms using bulky passive filtering systems. The recently presented selective harmonic mitigation technique (SHMPWM) produces output waveforms where the harmonic distortion is limited fulfilling specific grid codes when the number of switching angles is high enough. The related technique has been previously presented using a switching frequency equal to 750Hz. In this paper, a special implementation of the SHMPWM technique optimized for very low switching frequency is studied. Experimental results obtained applying SHMPWM to a three-level neutral point clamped converter using a switching frequency equal to 350Hz are presented. The obtained results show that the SHMPWM technique improves the results of previous selective harmonic elimination (SHEPWM) techniques for very low switching frequencies. This fact highlights that the SHMPWM technique is very useful in high power applications leading its use an important reduction of the bulky and expensive filtering elements.
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