Stability Enhancement Method of Standalone Modular Multilevel Converters Based on Impedance Reshaping

Youzhuo Zheng, Long Hua, Yekui Yang, Chun Li, Chaoyi Luo, Zihong Song, Xingwu Yang and Haibo Feng ()
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Youzhuo Zheng: Electric Power Research Institute, Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Long Hua: Electric Power Research Institute, Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Yekui Yang: Electric Power Research Institute, Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Chun Li: Electric Power Research Institute, Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Chaoyi Luo: Electric Power Research Institute, Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Zihong Song: Electric Power Research Institute, Guizhou Power Grid Co., Ltd., Guiyang 550002, China
Xingwu Yang: College of Electrical Engineering Shanghai University of Electric Power, Shanghai 200090, China
Haibo Feng: College of Electrical Engineering Shanghai University of Electric Power, Shanghai 200090, China

Energies, 2024, vol. 17, issue 4, 1-19

Abstract: Modular multilevel converters (MMCs) are susceptible to subsynchronous oscillations (SSOs) caused by impedance interactions in the power line. Current research into the stability of MMCs focuses mainly on voltage feed-forward control, while the effect of current feed-forward control is neglected. This paper proposes a current feed-forward compensation method based on impedance reshaping for standalone MMCs. Initially, an impedance model was developed to identify the stability risks caused by the interaction between the MMC and power line impedance. The proposed method feeds the current compensation signal into the modulation circuit, thereby improving the control signal and suppressing the impedance interaction between the MMC and the power line. The analysis of the harmonic state space (HSS) method verifies that the proposed approach effectively reduces the negative damping region in the frequency band where the SSO is located. Additionally, the impedance frequency scanning method confirms the accuracy of impedance modeling. Using the MATLAB/Simulink platform and StarSim HIL hardware-in-the-loop experimental platform, the SSO phenomenon of the MMC is simulated, and the results show that the proposed method can effectively suppress harmonic currents during SSO, which verifies the accuracy of the stability analysis and the feasibility of the proposed method.

Keywords: modular multilevel converter; subsynchronous oscillation; harmonic state space; stability; feed-forward control (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: 2024
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