Journal of Jilin University (Information Science Edition) ›› 2025, Vol. 43 ›› Issue (3): 565-574.

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Impedance Modeling and Stability Analysis of VIENNA-LLC Type Charging Module

YANG Chen1, BAO Jie1, CHEN Liangliang1, HUANG Xiaoqing2   

  1. 1. NARI Technology Development Limited Company, State Grid Electric Power Research Institute, Nanjing 211106, China; 2. School of Electrical and Information Engineering, Hunan University, Changsha 410082, China
  • Received:2024-04-19 Online:2025-06-19 Published:2025-06-19

Abstract:  In order to solve the problem of constructing the overall impedance model of electric vehicle cascade- type charging module, a cascade-type charging module impedance modeling method based on VIENNA rectifier and full-bridge LLC resonant converter is proposed. Firstly, a typical topology of the charging module is determined, and the small signal model of the front VIENNA rectifier based on the state space method and the rear full-bridge LLC resonant converter based on the equivalent circuit method are constructed respectively. Secondly, the closed-loop output impedance of VIENNA rectifier and the closed-loop output impedance and input impedance of full-bridge LLC resonant converter are obtained by combining the control strategy. The small Signal circuit model of the charging module can be obtained by integrating the front and rear small signal models and control strategies, and then the overall impedance model of the charging module can be derived. According to Nyquist stability criterion, the influence of system parameters on the stability of charging module is analyzed. The charging module simulation system is built based module. The proposed modeling method realizes the overall impedance modeling of single-stage to two-stage charging modules, and provides a theoretical basis for analyzing the parallel stability of charging modules in the future.

Key words: charging module, impedance modeling, stability analysis, VIENNA rectifier, full bridge LLC resonant converter

CLC Number: 

  • TP17