Passivity Enhancement in RES Based Power Plant with Paralleled Grid-Connected Inverters

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Abstract

Harmonic instability is threatening the operation of power plants with multiple grid connected converters in parallel. To analyze and improve the stability of the grid connected converters, the passivity of the output admittance converters is first analyzed in this paper. It is shown that the non-passivity of the output admittance of the converters will make the system unstable under certain grid conditions. Based on the stability analysis, this paper proposes a new method to cancel the nonpassivity of the power plant by using inverters with different power rating and control strategies. Three specific cases, where the LCL parameters, sampling frequency and current control strategies of the paralleled inverters are different, are studied. The results suggest that the grid connected converters with different power ratings and control strategies improve the stability of the power plant as a whole.
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Details

Harmonic instability is threatening the operation of power plants with multiple grid connected converters in parallel. To analyze and improve the stability of the grid connected converters, the passivity of the output admittance converters is first analyzed in this paper. It is shown that the non-passivity of the output admittance of the converters will make the system unstable under certain grid conditions. Based on the stability analysis, this paper proposes a new method to cancel the nonpassivity of the power plant by using inverters with different power rating and control strategies. Three specific cases, where the LCL parameters, sampling frequency and current control strategies of the paralleled inverters are different, are studied. The results suggest that the grid connected converters with different power ratings and control strategies improve the stability of the power plant as a whole.
Original languageEnglish
Title of host publicationProceedings of IEEE Energy Conversion Congress and Exposition (ECCE), 2016
Number of pages8
PublisherIEEE Press
Publication dateSep 2016
ISBN (Print)978-1-5090-0737-0
DOI
StatePublished - Sep 2016
Publication categoryResearch
Peer-reviewedYes
Event2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016 - Milwaukee, United States
Duration: 18 Sep 201622 Sep 2016

Conference

Conference2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016
LandUnited States
ByMilwaukee
Periode18/09/201622/09/2016
SponsorIEEE, IEEE Industry Applications Society (IAS), IEEE Power Electronics and Industry Applications Societies (PELS), IEEE, IEEE Industry Applications Society (IAS), IEEE Power Electronics and Industry Applications Societies (PELS)

    Research areas

  • Grid connected converter, Stability, Passivity, LCL filter
ID: 248980394