Small Signal Modeling and Stability Analysis of Modular Multilevel Converter Based on Harmonic State-Space Model

Nian Mei, Shiyuan Yin, Yue Wang, Zhuling Li, Pengkun Li, Yonghui Liu, Bo Yue and Zhenyu Li
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Nian Mei: State Grid Economic and Technological Research Institute CO.LTD, Beijing 102209, China
Shiyuan Yin: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yue Wang: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Zhuling Li: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Pengkun Li: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yonghui Liu: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Bo Yue: State Grid Economic and Technological Research Institute CO.LTD, Beijing 102209, China
Zhenyu Li: State Grid Corporation of China, Beijing 100031, China

Energies, 2020, vol. 13, issue 5, 1-22

Abstract: The stability of Modular multilevel converter (MMC) itself is the premise of analyzing the stability of MMC cascading with other cells, so this paper addressed the small-signal stability of MMC with dc voltage control mode which is the common operation mode of grid-side MMC in high-voltage direct current (HVDC) systems. First, the small signal model of MMC with open-loop control mode and dc voltage control mode while considering the dc voltage controller and current controller are established with the harmonic state-space (HSS) modeling method. Subsequently, eigenvalues and participation factors are analyzed to estimate the stability of MMC system and the influence of controller parameters, especially the proportional coefficients of dual-loop controllers, which can improve the design efficiency of control system. Finally, time-domain simulations in MATLAB/Simulink are provided to verify the accuracy of HSS small signal model and the effectiveness of the theoretical stability analysis.

Keywords: modular multilevel converter; small-signal model; harmonic state-space; stability analysis; participation factor (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: 2020
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