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【24h】 An Adaptive Digital-Control Scheme for Improved Active Power Filtering Under Distorted Grid Conditions

【摘要】The operation of active power filters (APFs) under nonideal grid conditions, such as grid-frequency fluctuation and voltage harmonics, can lead to significant degradation in harmonic compensation performance. This paper proposes an adaptive digital-control scheme for a three-phase APF for use in harmonically distorted and variable-frequency grid conditions. This scheme is comprised of a grid-frequency adaptive resonant current controller and an enhanced synchronous-reference-frame phase-locked loop (SRF-PLL). The PLL uses an inherently stable adaptive-filtering stage to improve grid phase and frequency estimates in the presence of voltage harmonics. The improved PLL frequency estimate is used to update the resonant gains of a PI + vector-proportional-integral current-control scheme, implemented in the SRF. This enables the APF to maintain optimal performance in distorted grid conditions. The performance of the proposed APF control scheme is evaluated in a test microgrid, with a 15-kVA three-phase voltage-source converter configured as the APF, a 90-kVA grid emulator utilized to replicate distorted grid conditions, and a load emulator implemented to draw harmonic currents. The control scheme presented here is shown to demonstrate significant performance improvements under nonideal grid conditions compared with equivalent adaptive and nonadaptive methods.

【期刊名称】 Industrial Electronics, IEEE Transactions on

【作者】Diarmaid John Hogan;Francisco J. Gonzalez-Espin;John G. Hayes;Gordon Lightbody;Raymond Foley;

【作者单位】;

【收录信息】;

【年(卷),期】2018(65),2

【年度】2018

【页码】988-999

【总页数】12

【原文格式】PDF

【正文语种】eng

【中图分类】;

【关键词】Power harmonic filters;Harmonic analysis;Active filters;Phase locked loops;Frequency estimation;Resonant frequency;

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