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Harmonic Optimization Techniques in Multi-Level Voltage-Source Inverter with Unequal DC Sources  

Aghdam, M. Ghasem Hosseini (Electrical Engineering Department, Amirkabir University of Technology)
Fathi, S. Hamid (Electrical Engineering Department, Amirkabir University of Technology)
Gharehpetian, Gevorg B. (Electrical Engineering Department, Amirkabir University of Technology)
Publication Information
Journal of Power Electronics / v.8, no.2, 2008 , pp. 171-180 More about this Journal
Abstract
One of the major problems in electric power quality is the harmonic contents. There are several methods of indicating the quantity of harmonic contents. The most widely used measure is the total harmonic distortion (THD). Various switching techniques have been used in static converters to reduce the output harmonic content. This paper presents and compares the two harmonic optimization techniques, known as optimal minimization of the total harmonic distortion (OMTHD) technique and optimized harmonic stepped-waveform (OHSW) technique used in multi-level inverters with unequal dc sources. Both techniques are very effective and efficient for improving the quality of the inverter output voltage. First, we describe briefly the cascaded H-bridge multi-level inverter structure. Then, we present the switching algorithm for the inverter based on OHSW and OMTHD techniques. Finally, the results obtained for the two techniques are analyzed and compared. The results verify the effectiveness of the both techniques in multi-level voltage-source inverter with non-equal dc sources, clarifying the advantages of each technique.
Keywords
Multi-level inverter; OHSW technique; OMTHD technique; Unequal dc sources; Homotopy algorithm;
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Times Cited By Web Of Science : 2  (Related Records In Web of Science)
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