期刊
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
卷 9, 期 3, 页码 3177-3188出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2020.3009056
关键词
Harmonic analysis; Power harmonic filters; Power electronics; Reliability; Resonant frequency; Synchronization; Inductors; Grid-tied converter; interleaving; < italic xmlns:ali=http; www; niso; org; schemas; ali; 1; 0; xmlns:mml=http; www; w3; org; 1998; Math; MathML xmlns:xlink=http; www; w3; org; 1999; xlink xmlns:xsi=http; www; w3; org; 2001; XMLSchema-instance> L <; italic > filter; parallel converter
资金
- Natural Sciences and Engineering Research Council of Canada
This article investigates the use of low-order L filters in parallel converters to eliminate resonance, simplify control, and meet harmonic limit requirements of standards. By interleaving a certain number of converters, the filter size can be smaller than high-order LCL filters, offering a promising solution for cost-effective and grid-friendly converters.
High-order filters, such as inductor-capacitorinductor ( LCL) filter, have been popular in grid-tied power converters. Although featuring small size, LCL filters are not grid friendly due to inherent resonance, especially when a large number of converters are in parallel operation in todays electric grid to attain modularity, reliability, and redundancy advantages. Thus, this article reconsiders the low-order L filter in parallel converters to eliminate the resonance and in turn to simplify the control. It is found that by interleaving a certain number of converters, the L filter will be sufficient to meet the harmonic limit requirements of the standards, while the filter size can be even smaller than the LCL filter. This further contributes to cost reduction as a promising solution for grid-friendly converters.
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