Real-time impedance-based stability assessment of grid converter interactions

Tuomas Messo, Roni Luhtala, Tomi Roinila, Dongsheng Yang, Xiongfei Wang, Frede Blaabjerg

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21 Citationer (Scopus)

Abstract

This paper proposes a method to monitor the impedance-based stability margin of grid-connected converters in real-time. A three-phase converter is configured to inject a broadband perturbation on top of its nominal output current to enable online identification of grid impedance. The ratio of converter and grid impedance is computed in real-time by utilizing the measured grid impedance and the analytical impedance model of the inverter. A Nyquist contour is plotted based on the impedance ratio. The contour can be used to assess impedance-based stability margin and to allow, e.g., adaptive tuning, more efficient post-fault diagnostics or to enable re-selection of control parameters. The method is implemented on a dSPACE real-time control platform and the associated Control Desk software. The paper also discusses potential limitations and suggests future improvements. A short video is available online to further illustrate the method.
OriginalsprogEngelsk
TitelProceedings of 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL)
Antal sider8
ForlagIEEE Press
Publikationsdatojul. 2017
ISBN (Elektronisk)978-1-5090-5326-1
DOI
StatusUdgivet - jul. 2017
Begivenhed18th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2017 - Stanford, USA
Varighed: 9 jul. 201712 jul. 2017

Konference

Konference18th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2017
Land/OmrådeUSA
ByStanford
Periode09/07/201712/07/2017

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