A New Virtual Inductance Control Method for Frequency Stabilization of Grid-Forming Virtual Synchronous Generators

Frequency stabilization is the premise of guaranteeing grid-friendly integration of virtual synchronous generator (VSG). Based on that premise, this article, focused on frequency stability, establishes the small signal model of grid-forming VSG system. At first, the mechanism of frequency oscillatio...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2023-01, Vol.70 (1), p.441-451
Main Authors: Yang, Yaqian, Xu, Jiazhu, Li, Chang, Zhang, Weiming, Wu, Qiuwei, Wen, Ming, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
Control methods
Couplings
Damping
Dynamic models
Eigenvalues
Feedback
Feedback effect
Frequency control
frequency offset (FO)
Frequency stability
Frequency stabilization
Inductance
Oscillators
Power system stability
rate of change of frequency (ROCOF)
virtual inductance control
virtual synchronous generator (VSG)
Voltage control
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Summary:Frequency stabilization is the premise of guaranteeing grid-friendly integration of virtual synchronous generator (VSG). Based on that premise, this article, focused on frequency stability, establishes the small signal model of grid-forming VSG system. At first, the mechanism of frequency oscillation occurring in system of active- and reactive-power coupling is analyzed by the defined feedback effect factor in this article. Besides, a new dynamic model is established for identifying dynamic interaction of voltage magnitudes and frequency by means of feedback effect. The analytical results of established models agree with that of eigenvalue analysis. Furthermore, a new virtual inductance control strategy is proposed to mitigate the unstable oscillation of frequency and powers, enhance damping performance, and improve stability margins. Unlike the conventional virtual inductance control, which is reliable on dual-loop control framework, the proposed virtual inductance control in this article is based on principle of energy conservation and can be applicable for the grid-forming inverter without inner dual-loop control structure. Finally, the proposed modeling as well as virtual inductance control method is experimentally verified.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2022.3148749