LCL-filter design for robust active damping in grid-connected converters

Peña-Alzola, Rafael and Liserre, Marco and Blaabjerg, Frede and Ordonez, Martin and Yang, Yongheng (2014) LCL-filter design for robust active damping in grid-connected converters. IEEE Transactions on Industrial Informatics, 10 (4). pp. 2192-2203. ISSN 1551-3203 (https://doi.org/10.1109/TII.2014.2361604)

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Abstract

Grid-connected converters employ LCL-filters, instead of simple inductors, because they allow lower inductances while reducing cost and size. Active damping, without dissipative elements, is preferred to passive damping for solving the associated stability problems. However, large variations in the grid inductance may compromise system stability, and this problem is more severe for parallel converters. This situation, typical of rural areas with solar and wind resources, calls for robust LCL-filter design. This paper proposes a design procedure with remarkable results under severe grid inductance variation. The procedure considers active damping using lead-lag network and capacitor current feedback. Passive damping is also discussed. The design flow, with little iteration and no complex algorithms, selects the proper ratios between the switching and resonance frequency, the grid and converter inductance, and the filter capacitance and total inductance. An estimation for the grid current total harmonic distortion (THD) is also proposed. Simulation and experiments validate the proposals.

  • Item type:Article
    ID code:70300
    Dates:
    Date
    Event
    1 November 2014
    Published
    7 October 2014
    Published Online
    Notes:© 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:28 Oct 2019 10:04
    Last modified:21 Apr 2024 10:05
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/70300
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