TY - GEN
T1 - DC Terminal Impedance Modeling and Stability Analysis for VSG-Controlled Grid-Connected Inverter
AU - Su, Xinyang
AU - Wang, Minghao
AU - Xue, Ying
AU - Chen, Junyu
AU - Shi, Wenzhuo
AU - Xu, Zhao
N1 - Publisher Copyright:
© 2024 IEEE.
PY - 2025/4/2
Y1 - 2025/4/2
N2 - 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.
AB - 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.
KW - impedance
KW - small-signal model
KW - stability
KW - virtual synchronous generator (VSG)
UR - https://www.scopus.com/pages/publications/105003248126
U2 - 10.1109/DCTS62535.2024.10939992
DO - 10.1109/DCTS62535.2024.10939992
M3 - Conference article published in proceeding or book
AN - SCOPUS:105003248126
T3 - 2024 IEEE International Conference on DC Technologies and Systems, DCTS 2024
SP - 327
EP - 332
BT - 2024 IEEE International Conference on DC Technologies and Systems, DCTS 2024
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2024 IEEE International Conference on DC Technologies and Systems, DCTS 2024
Y2 - 19 October 2024 through 20 October 2024
ER -