Abstract
The inherent large damping effect in virtual synchronous generator (VSG) control brings great challenges to its transient analysis. The recent studies mainly focus on qualitative explanation of damping effect, lacking an intuitive and quantitative assessment method. In this letter, the concept of damping area is introduced to visualize the transient damping energy in a tailored phase portrait, which facilitates the physical and intuitive understanding of damping effects. On top of that, the damping area approximation method is further proposed to evaluate attraction domain quantitatively, and its conservativeness for VSG control is proved in theory and validated by experiments. The proposed method evaluates the impact of damping on attraction domain quantitatively and intuitively, and it may provide some insights into the VSG transient stability analysis.
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