All-pass-filter-based active damping for VSCs with LCL filters connected to weak grids

Roldán-Pérez, Javier and Bueno, Emilio J. and Peña-Alzola, Rafael and Rodríguez-Cabero, Alberto (2018) All-pass-filter-based active damping for VSCs with LCL filters connected to weak grids. IEEE Transactions on Power Electronics, 33 (11). pp. 9890-9901. ISSN 0885-8993 (https://doi.org/10.1109/TPEL.2017.2789218)

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Abstract

LCL filters are commonly used to connect Voltage Sourced Converters (VSCs) to the grid. This type of filter is cheaper than a single inductor for the same current THD, but it generates resonance problems if no active or passive damping method is applied. Active damping methods are becoming popular in the literature because they improve efficiency, but they are sometimes difficult to implement and additional measurements are required. This paper proposes an active damping method for VSCs connected to weak grids that is based on making zero the open-loop phase at the resonance frequency. It will be shown that this strategy provides adequate damping of oscillations and that it can be achieved in two different ways: at the design stage (if the design constraints make it possible) or with an all-pass filter in series with the current controller. Two methods to design the all-pass filter are proposed. Also, the proposed active damping technique is compared with three alternatives already proposed in the literature. All the control algorithms are verified by simulation and in a 15 kW prototype of a three-phase VSC connected to a configurable weak grid via a LCL filter.

  • Item type:Article
    ID code:63259
    Dates:
    Date
    Event
    30 November 2018
    Published
    3 January 2018
    Published Online
    18 December 2017
    Accepted
    Notes:© 2018 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:13 Feb 2018 14:05
    Last modified:11 Nov 2024 11:54
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/63259
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