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.
Originalsprog | Engelsk |
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Titel | Proceedings of 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL) |
Antal sider | 8 |
Forlag | IEEE Press |
Publikationsdato | jul. 2017 |
ISBN (Elektronisk) | 978-1-5090-5326-1 |
DOI | |
Status | Udgivet - jul. 2017 |
Begivenhed | 18th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2017 - Stanford, USA Varighed: 9 jul. 2017 → 12 jul. 2017 |
Konference
Konference | 18th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2017 |
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Land/Område | USA |
By | Stanford |
Periode | 09/07/2017 → 12/07/2017 |