Sensitivity Analysis of Different Controller  Parameters on the Stability of the  Weak-grid-tied Interlinking VSC

Zhiwei Zeng; Jinbin Zhao; Member; IEEE; Sujie Zhang; Ling Mao; Keqing Qu

Citation:Zhiwei Zeng,Jinbin Zhao,Member,et al.Sensitivity Analysis of Different Controller Parameters on the Stability of the Weak-grid-tied Interlinking VSC[J].Protection and Control of Modern Power Systems,2025,V10(1):40-51[Copy]

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Sensitivity Analysis of Different Controller Parameters on the Stability of the Weak-grid-tied Interlinking VSC
Zhiwei Zeng,Jinbin Zhao, Member, IEEE,Sujie Zhang,Ling Mao,Keqing Qu
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Abstract:

The stability problem arising from the DC-link voltage outer loop and current inner loop control in weak-grid-tied interlinking voltage-source converters (VSC) system has been extensively investigated. However, the different impacts on system stability caused by these controller parameters have not been well solved. A three-port hybrid AC/DC admittance-based model for VSC taking into account AC- and DC-side dynamics is developed for revealing the mechanism intuitively on the formation of the positive and negative feedback effects in the DC-link voltage control loop. Subsequently, the stability characteristics of the voltage outer loop and current inner loop controller parameters on VSC are analyzed. Compared to adjusting the voltage outer loop controller parameters which has significant effort on the dynamic regulation characteristics, it is more sensitive on system stability by the parameter change of the current inner loop controller. Theoretical results, along with experimental verification, are provided to validate the analysis.

Key words: Weak-grid-tied interlinking VSC, admittance-based model, positive and negative feedback loop effects, stability.

DOI：10.23919/PCMP.2023.000303

Fund:This work is supported by the National Natural Science Foundation of China (No. 52177184) and the Shanghai Municipality on Natural Science Fund (No. 21ZR1425300).