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Improved Real-Time Stability Assessment of Grid-Connected Converters Using MIMO-Identification Methods

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


Original languageEnglish
Title of host publicationThe 10th Annual IEEE Energy Conversion Congress and Exposition (ECCE 2018)
Subtitle of host publicationSeptember 23 – 27, 2018, Portland, Oregon, USA
Number of pages8
ISBN (Electronic)978-1-4799-7312-5
Publication statusPublished - 6 Dec 2018
Publication typeA4 Article in a conference publication
EventIEEE Energy Conversion Congress and Exposition - Portland, United States
Duration: 23 Sep 201827 Sep 2018


ConferenceIEEE Energy Conversion Congress and Exposition
CountryUnited States


Several stability and power quality problems have been reported recently in power systems, which experience a high penetration of power electronics converters, such as renewable energy inverters. The problems are often caused by the interaction between the converter and the grid impedance. Stability monitoring tools have been presented to gain insight into the stability margin of the power system. Online methods are most favorable since the power system has many parameters that vary with time. However, the online methods that have been presented may produce inaccurate estimate of the stability margin due to several simplifications, such as using reduced-order impedance models. This paper introduces an improved dq-domain stability analysis that takes into account the time-varying grid impedance in real time and also the multivariable inverter output impedance, including the crosscouplings.