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Frequency Response Analysis of Load Effect on Dynamics of Grid-Forming Inverter

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


Original languageEnglish
Title of host publicationInternational Power Electronics Conference, (IPEC-Niigata 2018 -ECCE Asia)
Subtitle of host publicationMay 20-24, 2018, Niigata, Japan
ISBN (Electronic)978-4-88686-403-1
Publication statusPublished - 2018
Publication typeA4 Article in a conference publication
EventInternational Power Electronics Conference, ECCE Asia -
Duration: 20 May 201824 May 2018


ConferenceInternational Power Electronics Conference, ECCE Asia


The grid-forming mode of the voltage source inverters (VSI) is applied in uninterruptible power supplies and micro-grids to improve the reliability of electricity distribution. During the intentional islanding of an inverter-based micro-grid, the grid-forming inverters (GFI) are responsible for voltage control, similarly as in the case of uninterruptible power supplies (UPS). The unterminated model of GFI can be developed by considering the load as an ideal current sink. Thus, the load impedance always affects the dynamic behavior of the GFI. This paper proposes a method, to analyze how the dynamics of GFI and the controller design are affected by the load. Particularly, how the frequency response of the voltage loop gain changes according to the load and, how it can be used to the predict time-domain step response. The frequency responses that are measured from a hardware-in-the-loop simulator are used to verify and illustrate explicitly the load effect.

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