The modular multilevel converter(MMC)based DC grid is considered as a future solution for bulk renewable energy integration and transmission.However,the high probability of DC faults and their rapid propagation speed are the main challenges in the development of DC grids.Existing research primarily focuses on the DC fault clearance methods,while the fault current suppression methods are still barely researched.Additionally,the coordination method of fault current suppres-sion and clearance needs to be optimized.In this paper,the technical characteristics of the current suppression methods are studied,and the coordinated methods of fault current suppression and clearance are proposed.At last,a cost comparison of these methods is presented.The research results show that the proposed strategies can reduce the cost of the protection equipment.

Xibei Zhao;Lixu Chen;Gen Li;Jianzhong Xu;Jinsha Yuan

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;School of Engineering,Cardiff University,Cardiff,UK

中国电机工程学会电力与能源系统学报（英文版）

[1]Xibei Zhao;Lixu Chen;Gen Li;Jianzhong Xu;Jinsha Yuan-.Coordination Method for DC Fault Current Suppression and Clearance in DC Grids)[J].中国电机工程学会电力与能源系统学报（英文版）,2022(05):1438-1447

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