DC Terminal Impedance Modeling and Stability Analysis for VSG-Controlled Grid-Connected Inverter
As a kind of grid-forming control method that can effectively provide virtual inertia for the power grid, the virtual synchronous generator (VSG) control has received increasing attention in recent years. However, the VSG control will extract energy from the DC side during a grid frequency drop, which brings a burden on the stability of the DC side of a VSG. To address this problem, this paper establishes a fully analytical small-signal model of the VSG DC terminal impedance, incorporating both the inertia mechanism and the DC side dynamics. The accuracy of the model is validated through comparison with the sweep frequency results of the simulation. Finally, the Nyquist criterion is employed to analyze the DC stability of the VSG, and the simulation results match well with the theoretical predictions.
Authors
- Wenzhuo Shi (ORCID: https://orcid.org/0000-0002-5942-062X)
- Xinyang Su (ORCID: https://orcid.org/0009-0003-0932-2233)
- Ying Xue (ORCID: https://orcid.org/0000-0001-8533-7515)
- Minghao Wang (ORCID: https://orcid.org/0000-0002-1224-9845)
- Zhao Xu (ORCID: https://orcid.org/0000-0003-4480-7394)
- Junyu Chen (ORCID: https://orcid.org/0000-0002-3407-5815)
Institutions
- Hong Kong Polytechnic University (HK)
- University of Macau (MO)
- City University of Macau (MO)
- South China University of Technology (CN)
Publication Details
- Published
- 2024-10-19
- DOI
- https://doi.org/10.1109/dcts62535.2024.10939992
- Citations
- 1
- Primary Topic
- HVDC Systems and Fault Protection
- Type
- article
- Field-Weighted Citation Impact
- 0.21
Funders
- Environment and Conservation Fund