期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：12
页码：12100
DOI：10.15680/IJIRSET.2015.0412078
出版社：S&S Publications
摘要：The dc component can cause line-frequency power ripple, dc-link voltage ripple, and a furtherSecond-order harmonic in the ac current. This paper has proposed an effective solution to minimize the dccomponent in three-phase ac currents and developed a software-based approach to mimic the blocking capacitorsused for the dc component minimization, the so-called virtual capacitor. The “virtual capacitor” is achieved byadding an integral of the dc Component in the current feedback path. A method for accurate extraction of the dccomponent based on double time integral, as a key to achieve the control, has been devised and approved effectiveeven under grid-frequency variation and harmonic conditions.
关键词：Virtual capacitor; Transformer less; photovoltaic inverters; Integral method
