A self-commissioning notch filter for active damping in a three-phase LCL-filter-based grid-tie converter

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Peña-Alzola, Rafael and Liserre, Marco and Blaabjerg, Frede and Ordonez, Martin and Kerekes, Tamas (2014) A self-commissioning notch filter for active damping in a three-phase LCL-filter-based grid-tie converter. IEEE Transactions on Power Electronics, 29 (12). pp. 6754-6761. ISSN 0885-8993 (https://doi.org/10.1109/TPEL.2014.2304468)

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Abstract

LCL-filters are a cost-effective solution to mitigate harmonic current content in grid-tie converters. In order to avoid stability problems, the resonance frequency of LCL-filters can be damped with active techniques that remove dissipative elements but increase control complexity. A notch filter provides an effective solution, however tuning the filter requires considerable design effort and the variations in the grid impedance limit the LCL-filter robustness. This paper proposes a straightforward tuning procedure for a notch filter self-commissioning. In order to account for the grid inductance variations, the resonance frequency is estimated and later used for tuning the notch filter. An estimation for the maximum value of the proportional gain to excite the resonance is provided. The resonance frequency is calculated using the Goertzel algorithm, which requires little extra computational resources in the existing control processor. The discrete Fourier transform coefficients are therefore obtained, with less calculations than the running sum implementation and less memory requirements than with the fast Fourier transform (FFT). Thus, the self-commissioning technique is robust to grid impedance variations due to its ability to tune the grid-tie inverter on-site. Finally, the analysis is validated with both simulation and experiments.

  • Item type:Article
    ID code:70299
    Dates:
    Date
    Event
    31 December 2014
    Published
    4 February 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 09:52
    Last modified:12 Nov 2024 03:51
    URI:https://strathprints.strath.ac.uk/id/eprint/70299
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