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Stability and Performance Analysis of Grid-Connected Inverter Based on Online Measurements of Current Controller Loop

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationIECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
Number of pages7
ISBN (Electronic)978-1-7281-4878-6
ISBN (Print)978-1-7281-4879-3
Publication statusPublished - Oct 2019
Publication typeA4 Article in a conference publication
EventAnnual Conference of the IEEE Industrial Electronics Society -
Duration: 1 Jan 1900 → …

Publication series

NameAnnual Conference of the IEEE Industrial Electronics Society
ISSN (Print)1553-572X
ISSN (Electronic)2577-1647


ConferenceAnnual Conference of the IEEE Industrial Electronics Society
Period1/01/00 → …


The amount of grid-connected three-phased inverters is increasing rapidly. In a weak grid, the non-ideal grid impedance decreases the control performance and can even compromise the system stability through load effect. The stability assessment of the inverter-grid interface has been assessed extensively through state-space and impedance-based methods. The current work presents stability analysis method based on the load-affected loop gain of the innermost control loop, which includes the effect of phase-locked loop and grid impedance. The stability analysis is carried out by assessing modeled and measured loop gains using the Nyquist criterion, step responses, and system closed-loop poles. The stability issues originating from grid impedance or too high phase-locked loop bandwidth are accurately predicted by examining the innermost control loop.


  • Inverters, Current measurement, Stability analysis, Load modeling, Power system stability, Impedance, Phase locked loops, Grid-connected inverter, Control system analysis, Online measurement

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