Abstract
The existing studies in the field of high-power converters with pre-programmed PWM selective harmonic elimination (PPWMSHE) are insufficient. Particularly pressing is determining the amplitudes of undeleted higher harmonics generated by a converter with PPWMSHE. It is the main cause of electronic equipment failure at the grid point of common connection, including the resonance phenomena. In this article, the voltage and current spectra of a three-level converter with PPWMSHE are investigated. The behavior of undeleted harmonics up to the 50th is shown in the voltage and current spectra of a three-level converter in the modulation index range from 0 to 1.15 for three PPWMSHE: No. 1–5 and 7; No. 2–5, 7, 11, and 13; No. 3–5, 7, 11, 13, 17 and 19. The study showed that for the considered PPWMSHE patterns, the harmonic that is the first after the last remote one has the largest amplitude, and its maximum value does not exceed 30.3%. The conducted studies are promising for high-power converters with a limited switching frequency of semiconductor modules. The results are applicable to solving the problems of ensuring electromagnetic compatibility, increasing energy efficiency and optimizing the power losses of semiconductor converters. The work is promising for further study and assessment of the power converters with PPWMSHE influence on modular topologies, multipulse connection schemes to the grid and resonant phenomena.
Keywords
power electronics, pulse-width modulation, pre-programmed PWM, selective harmonic elimination, voltage source inverter, three-level converter
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