Low-frequency converter-driven oscillations in weak grids : explanation and damping improvement

Wu, Guanglu and Sun, Huadong and Zhao, Bing and Xu, Shiyun and Zhang, Xi and Egea Àlvarez, Agustí and Wang, Shanshan and Li, Gen and Li, Yingbiao and Zhou, Xiaoxin (2021) Low-frequency converter-driven oscillations in weak grids : explanation and damping improvement. IEEE Transactions on Power Systems, 36 (6). 5944 - 5947. ISSN 0885-8950 (https://doi.org/10.1109/TPWRS.2021.3099341)

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Abstract

Low-frequency oscillations have been reported in several weak-grids-connected voltage-source-converter(VSC) systems. Although efforts have been devoted to understand the parametric and sensitivity impact of the VSC controller gains, a general formulation of the oscillation mechanism is still missing. Using transfer function dynamic modelling approach, we find that the outer loop active power control’s bandwidth mainly determines the oscillation frequency. The PLL introduces a large phase lag around the frequency of the PLL bandwidth in weak grids which decreases the oscillation damping. A simple but effective PI+Clegg integrator (CI) compensator is proposed to replace the standard outer loop active power controller compensating the PLL’s phase delay and increase the oscillation damping. The results are verified in a real time digital simulator.

  • Item type:Article
    ID code:77059
    Dates:
    Date
    Event
    November 2021
    Published
    26 July 2021
    Published Online
    30 June 2021
    Accepted
    Notes:© 2021 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:12 Jul 2021 13:35
    Last modified:22 Apr 2024 00:48
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/77059
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