LIN Junjie,ZHANG Haobo,XIANG Wang,et al.Analysis on Inertia Support Capability of Modular Multilevel Converter Capacitor Energy for AC System[J].Automation of Electric Power Systems,2025,49(8):118-128.
LIN Junjie,ZHANG Haobo,XIANG Wang,et al.Analysis on Inertia Support Capability of Modular Multilevel Converter Capacitor Energy for AC System[J].Automation of Electric Power Systems,2025,49(8):118-128. DOI: 10.7500/AEPS20240410003.
The modular multilevel converter based high voltage direct current (MMC-HVDC) transmission system has the potential to use the submodule capacitor energy storage to support the inertia of the AC grid. However
the existing research generally believes that the inertia provided by the MMC-HVDC system is limited by its energy storage time constant. Compared with the synchronous generators
the effect is weak
and there is a lack of quantitative indicators to measure its support strength. In view of the above problems
based on the frequency response model of the MMC-HVDC transmission system
a quantitative analysis method for the inertia support of the single-end flexible DC converter station to the AC system is proposed
and the MMC-HVDC equivalent inertia constant is proposed as a measuring indicator. The support power source and support effect of different control strategies are analyzed
and the equivalent inertia constant under different control strategies is calculated. The theory is further extended to the modular multilevel converter based multi-terminal high voltage direct current (MMC-MTDC) system. The proposed equivalent inertia constant is modified to make it suitable for the MMC-MTDC system
and the enhancement of the support strength with the increase of the number of terminals and the total energy storage of capacitors is discussed. The simulation model of three-terminal MMC-MTDC power grid is built in PSCAD environment
and the simulation results verify the effectiveness of the proposed quantitative analysis method.
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references
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Related Author
LIN Junjie
ZHANG Haobo
XIANG Wang
WEN Jinyu
ZHAO Shuqiang
GAO Mingyang
WANG Hui
QU Hanchen
Related Institution
State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology)
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University)
State Grid Jibei Electric Power Co., Ltd.
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education (Northeast Electric Power University)
College of Electrical Engineering, Zhejiang University