Practical implementation of the zero harmonic distortion converter in distorted grids
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Universidade Federal de Minas Gerais
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Artigo de periódico
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The Zero Harmonic Distortion converter is a grid-tied converter that can be used in various applications in the metal industry. Its current is sinusoidal and obtained without using a high-frequency rectifier and capacitive filter elements. Instead, there is a three-winding transformer with two converters using selective harmonic elimination (SHE) modulation. However, its use on an already distorted grid presents a challenge to mitigate current distortions. This article discusses the implementation of a new set of angles for SHE modulation that generates a lower level of non-eliminated harmonics and therefore reduces the current total demand distortion (TDD). Experimental results show a TDD reduction of from 7.39% to 2.41% in distorted grids, within the limits recommended by IEEE 519-2022, and a TDD of 2.02% in sinusoidal grids.
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Harmonic distortion, Zero Harmonic Distortion, Harmonic elimination, Power quality, Three-winding transformer, Active front-end, Filterless
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https://ieeexplore.ieee.org/document/10173599