A combined <i>dq</i>-MIMO and sequence-SISO impedance-based stability assessment scheme for IBR interfaced system

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Date

2023-11-01

Author

Meng, Lei
Xue, Tao
Karaağaç, Ulaş
Cai, Lijun

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The electromagnetic transient (EMT)-type impedance scanning methods conducted in positive sequence domain and dq-frame (p-scan and dq-scan, respectively) have been widely used for identifying inverter-based resource (IBR) instabilities. They obtain the sequence domain single-input single-output (sequence-SISO) and dq-frame multi-input multi-output (dq-MIMO) impedance models of an IBR, respectively. The dq-MIMO impedance-based stability assessment (IBSA) is more accurate compared to the sequence-SISO IBSA as it considers the mirror frequency effect (MFE). However, unlike the sequence-SISO, the dq-MIMO IBSA cannot differentiate the resonance frequency from its mirror frequency, because the dynamics in dq-frame incorporate both the positive and negative sequence impedances of IBR. This paper proposes a new IBSA scheme to eliminate this shortcoming. First, a dq-MIMO IBSA is carried out to obtain the accurate dq-frame resonance frequency and stability margin. Then a sequence-SISO IBSA is conducted to determine the phase domain resonance frequency. The sequence-SISO impedance models are transformed from the dq-MIMO model. The proposed scheme has lower computational costs than the existing dq-MIMO IBSA methods. The effectiveness of the proposed scheme is validated on a test system incorporating full-size converter-based wind park (FSC-based WP). This paper also demonstrates the possibility of weak grid instability occurrence in supersynchronous frequency range.

Subject Keywords

Dq-MIMO impedance, EMT-type impedance scanning, Impedance-based stability assessment, Impedance transformation, Sequence-SISO impedance

URI

https://hdl.handle.net/11511/114881

Journal

ENERGY REPORTS

DOI

https://doi.org/10.1016/j.egyr.2023.12.006

Collections

Department of Electrical and Electronics Engineering, Article

Citation Formats

L. Meng, T. Xue, U. Karaağaç, and L. Cai, “A combined <i>dq</i>-MIMO and sequence-SISO impedance-based stability assessment scheme for IBR interfaced system,” ENERGY REPORTS, vol. 9, pp. 454–459, 2023, Accessed: 00, 2025. [Online]. Available: https://hdl.handle.net/11511/114881.