Examination of EMT-Type Impedance Scanning Techniques for Small Signal Stability Assessment of Inverter Based Resources

Date

2025-01-01

Author

Meng, Lei
Karaağaç, Ulaş
Pavani, Ahda
Mahseredjian, Jean
Jacobs, Keijo

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Modern power grids that incorporate inverter-based resources (IBRs) may be vulnerable to persistent oscillations and instability incidents, which jeopardize the reliable operation of the system. Unstable operation conditions can be identified via impedance-based stability assessment (IBSA) methods, provided that accurate frequency-dependent impedance models of the system are available. A promising approach for obtaining such impedance models is to use time-domain simulation scanning techniques based on electromagnetic transient (EMT)-type software. This paper studies and compares five EMT-type impedance scanning methods in terms of their application procedures, analytical relationship between obtained impedances, IBSA accuracies, and computational burdens. Critical technical notifications and guidelines for the selection and application of these scanning methods, considering different types of instabilities, are provided. For accuracy assessment, the IBSA results are compared with EMT simulations on a practical test system.

Subject Keywords

DFIG-based wind park, EMT-type impedance scanning, impedance-based stability assessment, inverter-based resource, series capacitor SSI, weak grid instability

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105002692908&origin=inward
https://hdl.handle.net/11511/114381

Collections

Department of Electrical and Electronics Engineering, Article