Modeling and Analysis of the Harmonic Interaction between Grid-Connected Inverter Clusters and the Utility Grid

Lintao Ren, Hui Guo, Zhenlan Dou, Fei Wang and Lijun Zhang
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Lintao Ren: School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200444, China
Hui Guo: School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200444, China
Zhenlan Dou: State Grid Shanghai Comprehensive Energy Service Co., Ltd., Shanghai 200023, China
Fei Wang: School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200444, China
Lijun Zhang: Instituto Superior Técnico, University of Lisbon, 999022 Lisbon, Portugal

Energies, 2022, vol. 15, issue 10, 1-19

Abstract: The virtual synchronous generator (VSG) is a promising technology for future utility grids, since it can mimic the output characteristics of a synchronous generator, which provides the necessary inertia to a utility grid. However, the large-scale application of VSGs is limited due to the harmonic interaction between VSGs and the utility grid. Therefore, in order to investigate the stability issue as well as improve the practical application for large-scale power stations, the harmonic interaction mechanism between the VSG cluster and the utility grid is addressed. Firstly, the output impedance model of a single VSG is established, and it is found that the resonance frequency is related to parameters including the output filter, controller, and grid impedance. On this basis, the capacitor current control for a grid-connected inverter based on a VSG is proposed to enhance the resonance suppression. Furthermore, the output impedance of the VSG cluster is established, which reveals the harmonic interaction characteristics between the VSG cluster and the utility grid. In addition, in order to suppress the resonance and improve the stability, an inner-loop control strategy of VSG is introduced. Finally, the simulation and experimental results verified the correctness of the established modeling and analysis of the harmonic interaction between the clustered VSGs and the utility grid. The results show that the proposed impedance model is correct and can predict the resonant point accuracy (which is around 2.3 kHz in the simulation and experimental cases). The total harmonic distortion (THD) can be reduced to 3.2% which meets the requirements of IEEE standard 519.

Keywords: output impedance; virtual synchronous generator; harmonic interaction; resonance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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