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Analysis of Ripple Current in the Capacitors of Active Power Filters

Author

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  • Tadeusz Platek

    (Institute of Control and Industrial Electronic, Warsaw University of Technology, 75 Koszykowa St., 00-662 Warsaw, Poland)

Abstract

This article provides formulae to determine the root mean square (rms) value of a capacitor current in an inductive-capacitive-inductive (LCL) filter used in a parallel active power filter (PAPF) circuit. The article presents an analysis of three components of the capacitor current: a component forced by the usually distorted voltage of the grid; a component forced by the nonlinear load current harmonics and harmonics in the output current of the PAPF that compensates them (a novel aspect presented in this document); and a component forced by the inverters of the PAPF containing carrier and sideband harmonics. The article also presents formulae for determining the rms value of current harmonics in dc-link capacitors forced by the ripple of the ac output current without load of the filter inverters (also novel to this document). The results of the analysis have been confirmed by simulation and experimental research of a commercial active filter consisting of two parallel interleaved voltage inverters. Elements of the LCL filter of the PAPF have been selected according to dependencies available in scientific and technical literature. In addition, the formulae presented in the article are used to verify the correctness of selection of capacitors from the point of view of their catalogue acceptable rms value of capacitor current.

Suggested Citation

  • Tadeusz Platek, 2019. "Analysis of Ripple Current in the Capacitors of Active Power Filters," Energies, MDPI, vol. 12(23), pages 1-31, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:23:p:4493-:d:290809
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    References listed on IDEAS

    as
    1. Yitao Liu & Ching-Ming Lai, 2018. "LCL Filter Design with EMI Noise Consideration for Grid-Connected Inverter," Energies, MDPI, vol. 11(7), pages 1-14, June.
    2. Yilun Shang, 2018. "Resilient Multiscale Coordination Control against Adversarial Nodes," Energies, MDPI, vol. 11(7), pages 1-17, July.
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