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DOE OSTI · 2229357

DQ Admittance Extraction for Inverter-Based Resources

Ramakrishna, Rahul H.·Miao, Zhixin·Fan, Lingling·Shah, Shahil (ORCID:0000000230532863)
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Abstract

The power grid industry is pushing for electromagnetic transient (EMT)-based studies for generation interconnection and planning process due to high penetrations of inverter-based resource (IBRs). Vendor-specific and site-specific black-box IBR models are preferred in those simulation studies. For small-signal analysis, measurement-based admittance models are necessary. In this paper, we demonstrate the extraction of frequency-domain dq frame IBR models. These linear models are specific to operating conditions. We demonstrate two extraction methods: frequency scan and a step response-based method. The latter relies on converting time-domain responses to Laplace-domain expressions via eigensystem realization analysis (ERA). Both can lead to dq admittance representation and the latter is time saving.

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admittance modeleigensystem realization analysisfrequency scanPOWER TRANSMISSION AND DISTRIBUTIONsystem identification

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Ramakrishna, Rahul H., Miao, Zhixin, Fan, Lingling, Shah, Shahil (ORCID:0000000230532863). 2023-09-25. DQ Admittance Extraction for Inverter-Based Resources. https://doi.org/10.1109/pesgm52003.2023.10253247

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DQ Admittance Extraction for Inverter-Based Resources: Preprint

The power grid industry is pushing for electro-magnetic transient (EMT)-based studies for generation interconnection and planning process due to high penetrations of inverter-based resource (IBRs). Vendor-specific and site-specific black-box IBR models are preferred in those simulation studies. For small-signal analysis, measurement-based admittance models are necessary. In this paper, we demonstrate the extraction of frequency-domain dq frame IBR models. These linear models are specific to operating conditions. We demonstrate two extraction methods: frequency scan and a step response-based method. The latter relies on converting time-domain responses to Laplace-domain expressions via eigensystem realization analysis (ERA). Both can lead to dq admittance representation and the latter is time saving.

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