Modeling and stability analysis of grid-tied VSC considering the impact of voltage feed-forward. (February 2022)

• Record Type: Journal Article
• Authors: Yin, Rui; Sun, Yuanyuan; Wang, Shanshan; Zhao, Bing; Wu, Guanglu; Qin, Shanmeng; Yu, Lin; Zhao, Yuetong
• Is Part Of: International journal of electrical power & energy systems. Volume 135(2022)
• Publication Date: 2022-02
• Subjects: Voltage source converter -- Voltage feed-forward -- SISO transfer function -- Grid impedance ratio -- Stability; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2021.107483
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: SISO transfer function models are derived to simplify the modeling and stability analysis process of the grid-tied VSC. The consistency of the different SISO transfer function modeling methods is proved. The impacts of voltage feed-forward are significantly influenced by the design of the current control parameters are analyzed. The mechanism of the weak grid-tied VSC without VFF are more stable than with VFF is analyzed. Abstract: The single-input and single-output (SISO) transfer functions are proposed in this paper to analyze the impact of voltage feed-forward (VFF) loop on the stability of grid-tied voltage-source converter (VSC). Based on the SISO transfer functions, the VFF's impacts are analyzed by considering the influence of current control integral time constant (ITC) and the grid impedance ratio X/R. To be specific, the VFF can improve the stability when the VSC has a large ITC, while it can decrease the stability when the VSC has a small ITC. The impedance ratio X/R is another affecting factor to the VFF when the phase-locked loop (PLL) dynamics are included in the transfer function model. The closed-loop poles of the VSC without the VFF loop are sensitive to the decrease of X/R, while it is not very susceptible to the variation of X/R when the VFF loop is applied in VSC. The proposed SISO transfer functions and stability analysis are both verified through simulations.