Sequence-impedance-based modelling of grid-connected inverter considering AC-side and AC-DC frequency coupling effects

Runyue Tang; Yunyi Zhu; Lucheng Hong

doi:10.1117/12.3024318

13 May 2024 Sequence-impedance-based modelling of grid-connected inverter considering AC-side and AC-DC frequency coupling effects

Runyue Tang, Yunyi Zhu, Lucheng Hong

Author Affiliations +

Proceedings Volume 13159, Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023); 1315958 (2024) https://doi.org/10.1117/12.3024318
Event: Eighth International Conference on Energy System, Electricity and Power (ESEP 2023), 2023, Wuhan, China

Abstract

The interaction between the inverter and the grid can result in system oscillation or instability. A widely used approach for investigating the stability of grid-connected inverter systems is sequence-impedance-based analysis. Most impedance/admittance models of inverters tend to ignore the influence of converter DC port disturbances and external loop control on system stability, and directly equate the DC side of the inverter as a voltage source. When the inverter DC port disturbances are large, ignoring the strong frequency coupling between AC and DC may lead to system stability misjudgement. To remedy this deficiency, a third-order derivative model is proposed for a typical LCL-filtered grid-connected converter in this paper, which takes into account the AC-side frequency coupling and AC-DC frequency coupling. The simulation outcomes validate the accuracy of the proposed model.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Runyue Tang, Yunyi Zhu, and Lucheng Hong "Sequence-impedance-based modelling of grid-connected inverter considering AC-side and AC-DC frequency coupling effects", Proc. SPIE 13159, Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023), 1315958 (13 May 2024); https://doi.org/10.1117/12.3024318

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