Open AccessImpact of control system on the DC impedance characteristics of low-medium frequency bands and stability of modular multilevel converter based HVDC system
Author(s) -
Xin Lin,
Chunyi Guo,
Yanning Wang,
Shuo Yang,
Chunhua Li,
Xingming Sun
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2247/1/012032
Subject(s) - electrical impedance , high voltage direct current , modular design , electric power system , control theory (sociology) , stability (learning theory) , correctness , power (physics) , computer science , voltage , engineering , direct current , electronic engineering , control (management) , physics , electrical engineering , quantum mechanics , artificial intelligence , machine learning , programming language , operating system
The resonance in modular multilevel converter based high voltage direct current (MMC-HVDC) system poses a potential threat to the safe and stable operation of the power grid. The mechanism of the resonance phenomenon is complicated, which is closely related to the impedance characteristics of MMC system. By establishing the DC impedance model of MMC-HVDC system at both ends, the influence of parameters of control system in converter stations on the DC impedance characteristics of MMC system was analyzed, revealing the main influencing frequency bands and effect of each control parameter. The DC impedance characteristics of low and medium frequency bands could be shaped in a targeted manner by adjusting the control parameters, the stability margin of the system will be improved as well. The correctness of the results was verified by time domain simulation. The analysis results of this article can provide reference for the selection of the parameters of control system and the improvement of stability margin of MMC-HVDC system.