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Accurate Measurement of Converter Sequence Impedance Responses by Active Cancellation of Coupling over Frequency

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


Original languageEnglish
Title of host publication2019 4th IEEE Workshop on the Electronic Grid (eGRID)
Number of pages6
ISBN (Electronic)978-1-7281-5704-7
ISBN (Print)978-1-7281-5705-4
Publication statusPublished - 2019
Publication typeA4 Article in a conference publication
EventIEEE Workshop on the Electronic Grid -
Duration: 1 Jan 1900 → …


ConferenceIEEE Workshop on the Electronic Grid
Period1/01/00 → …


Impedance-based analysis plays important role in assessing the stability and dynamics of grid-connected inverters and related systems. Measuring the inverter impedance is, however, not straightforward due to the load effect caused by the power grid. The power grid interacts with the inverter and produces additional (mirrored) frequency harmonics thus distorting the impedance measurements when applying conventional measurement techniques. This paper proposes an active-power filtering method to minimize the undesired load effect caused by the power grid in the measured impedance. Applying the method, the inverter output impedance can be reliably measured under non-ideal grid conditions.

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