Impedance Modeling and Stability Analysis for Cascade System of Three-Phase PWM Rectifier and LLC Resonant Converter

Rutian Wang, Yuyang Wu, Guoqing He, Ying Lv, Jiaxing Du and Yanhao Li
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Rutian Wang: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Yuyang Wu: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Guoqing He: China Electric Power Research Institute, Beijing 100192, China
Ying Lv: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Jiaxing Du: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Yanhao Li: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China

Energies, 2018, vol. 11, issue 11, 1-15

Abstract: In this paper; the impedance model of PWM rectifier and LLC resonant converter are deduced, and the stability analysis of cascade system is studied. The principle of three-phase PWM rectifier is introduced; and the small signal model in d-q coordinate system is deduced. The expression of dc side output impedance model for PWM rectifier is derived. The LLC resonant converter is operated in a fixed-frequency state, and the LLC resonant converter is modeled as a small signal model. On this basis, the input impedance model expression of the LLC resonant converter is derived. According to the impedance stability criterion, it can seen that the amplitude of input impedance is greater than the amplitude of output impedance in a certain frequency domain. In addition, the Nyquist curve is not around the point (−1,0), which can judge that the cascade system is stable. In simulation software, a cascade system simulation is built and corresponding simulation curves are obtained, which verifies the stability of the cascade system.

Keywords: small signal modeling; impedance model; bird chart; Nyquist plot; impedance stability criterion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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