Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Impedance modeling and stability analysis of modular multilevel converter considering frequency coupling characteristics

  • Shi, Kai (Department of Electrical Engineering, Jiangsu University) ;
  • Lu, Peng (Department of Electrical Engineering, Jiangsu University) ;
  • Sun, Yuxin (Department of Electrical Engineering, Jiangsu University) ;
  • Xu, Peifeng (Department of Electrical Engineering, Jiangsu University)
  • Received : 2021.10.23
  • Accepted : 2022.04.04
  • Published : 2022.08.20
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Abstract

In recent years, a series of studies concerning the oscillation of interconnected systems has shown that frequency coupling has important effects on the stability of the system. In this paper, a more accurate theoretical model considering the frequency coupling effects is adopted to derive the transmission process in vector control, phase lock loop, and proportional-resonant controller of the harmonic perturbation in the frequency domain. This model is used to further deepen the application of harmonic linearization modeling to impedance modeling. An integrated three-phase modular multilevel converter simulation model based on the PSCAD platform is built to verify the accuracy of the theoretical modeling through the frequency sweep method. The influence of related system parameters on sequence and coupling impedance is analyzed in detail. The generalized Nyquist criterion is used to study the importance of coupling impedance to the stability analysis of the system.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China under Grant no. 52177045, in part by the National Key R&D Program of China under Grant no. 2017YFB0103200, and in part by the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institution.

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