A novel pilot protection for VSC-MTDC based on correlation analysis
DOI:10.19783/j.cnki.pspc.190945
Key Words:VSC-MTDC  meshed structure  correlation analysis  superimposed energy  pilot protection
Author NameAffiliation
LIN Xiangning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology, Wuhan 430074, China 
LIU Qi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology, Wuhan 430074, China 
FAN Lixiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology, Wuhan 430074, China 
ZHENG Yuchao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology, Wuhan 430074, China 
TONG Ning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology, Wuhan 430074, China 
LI Zhengtian State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology, Wuhan 430074, China 
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Abstract:Lacking the boundary elements greatly reduces the electrical distance between the lines, which makes it difficult to distinguish internal fault and external fault. To solve this problem, this paper first analyzes the complex refraction and reflection phenomenon in the VSC-MTDC, and the attenuation difference between the homonymic traveling waves and anonymous traveling waves are analyzed. Based on the correlation analysis, above difference is expressed by this means. A novel protection scheme for meshed VSC-MTDC is proposed using correlation coefficient differential protection and the superimposed component energy start-up criterion. By means of simulation analysis, the proposed protection scheme works well under different fault conditions, and has good selectivity and speed. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 5100-201999331A-0-0-00) and China Postdoctoral Science Foundation (No. 2018M642838).
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