Cristin-resultat-ID: 1871114
Sist endret: 30. desember 2021, 09:29
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

Apparent Impedance-Based Adaptive Controller for Improved Stability of Droop-Controlled Microgrid

Bidragsytere:
  • Fredrik T. B. W. Göthner
  • Raymundo E. Torres Olguin
  • Javier Roldan-Pérez
  • Atle Rygg og
  • Ole-Morten Midtgård

Tidsskrift

IEEE transactions on power electronics
ISSN 0885-8993
e-ISSN 1941-0107
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021
Trykket: 2021
Volum: 36
Hefte: 8
Sider: 9465 - 9476

Importkilder

Scopus-ID: 2-s2.0-85099565413

Beskrivelse Beskrivelse

Tittel

Apparent Impedance-Based Adaptive Controller for Improved Stability of Droop-Controlled Microgrid

Sammendrag

Droop control is the most common approach for controlling microgrids (MGs) and interfacing distributed generators (DGs) due to its inherent power-sharing characteristics and low dependence on communication systems. However, the stability of MGs operated with this control paradigm is sensitive to the droop parameter values and system topology. This situation will be even more challenging in future grid scenarios, where system reconfiguration and parameter uncertainty will become more relevant. In this paper, a centralized controller for improving the stability margins of a MG is proposed. Firstly, the apparent impedance of the MG is periodically identified by injecting a multi-tone current perturbation. Then, the matrix fitting technique is applied to calculate the system eigenvalues based on the estimated apparent impedance. Depending on the location of the dominant eigenvalues, the droop gains are modified by using a control law to ensure sufficient stability margins. No previous information of the system topology or parameter values is required. It is shown that this method can greatly improve stability margins without compromising the inherent power sharing, transient performance and low dependence on communication systems of the droop control. Simulation and experimental results for a MG based on DGs rated at 60 kVA are included to validate the proposed control scheme. Index Terms—Microgrid Control, Impedance Estimation, Adaptive Control, Apparent Impedance Analysis.

Bidragsytere

Fredrik Tomas Bjørndalen W Göthner

Bidragsyterens navn vises på dette resultatet som Fredrik T. B. W. Göthner
  • Tilknyttet:
    Forfatter
    ved Institutt for elkraftteknikk ved Norges teknisk-naturvitenskapelige universitet

Raymundo Enrique Torres-Olguin

Bidragsyterens navn vises på dette resultatet som Raymundo E. Torres Olguin
  • Tilknyttet:
    Forfatter
    ved Energisystemer ved SINTEF Energi AS

Javier Roldan-Pérez

  • Tilknyttet:
    Forfatter
    ved Spania

Atle Rygg

  • Tilknyttet:
    Forfatter
    ved Institutt for teknisk kybernetikk ved Norges teknisk-naturvitenskapelige universitet

Ole-Morten Midtgård

  • Tilknyttet:
    Forfatter
    ved Institutt for elkraftteknikk ved Norges teknisk-naturvitenskapelige universitet
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