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Line Current Characteristics of Multilevel H-Bridge Inverters: Part II - Harmonic Reduction with Multiple Transformer Windings  

Jeong, Seung-Gi (광운대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.13, no.3, 2008 , pp. 237-245 More about this Journal
Abstract
Recently, multilevel H-bridge inverters have become popular in medium to high power ac drive applications. One of significant advantages of them is low harmonic contents in their input line currents thanks to the transformer with multiple phase-shifted secondary windings. This paper attempts to provide basic guidelines for the design of the phase shifting transformer windings and theoretical analysis of input line current harmonics of H-bridge inverters. The part II is devoted to the analysis of the harmonic characteristics of the input line current, providing mathematical background for the equidistant phase-shifting angle distribution policy for harmonic elimination.
Keywords
Multilevel inverter; H-bridge inverter; Extended-delta winding; Harmonics;
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  • Reference
1 Murray R. Spiegel, Mathematical Handbook of Formulas and Tables, Schaum's Outline Series
2 Peter W. Hammond, US Patent 5,625,545, 1997