Flexible DC grid line fault protection scheme based on instantaneous frequency of transient voltage
DOI：10.19783/j.cnki.pspc.260041
Key Words:boundary protection  transient voltage  instantaneous frequency  singular value decomposition  discrete energy separation algorithm  singularity
Author NameAffiliation
ZHANG Zhan 1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
2. Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Jiaozuo 454003, China
3. School of Electrical Engineering, Xi'an University of Technology, Xi'an 710000, China
4. School of Software, Henan Polytechnic University, Jiaozuo 454003, China 
HOU Yaojie 1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
2. Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Jiaozuo 454003, China
3. School of Electrical Engineering, Xi'an University of Technology, Xi'an 710000, China
4. School of Software, Henan Polytechnic University, Jiaozuo 454003, China 
WEI Yanfang 1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
2. Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Jiaozuo 454003, China
3. School of Electrical Engineering, Xi'an University of Technology, Xi'an 710000, China
4. School of Software, Henan Polytechnic University, Jiaozuo 454003, China 
ZENG Zhihui 1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
2. Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Jiaozuo 454003, China
3. School of Electrical Engineering, Xi'an University of Technology, Xi'an 710000, China
4. School of Software, Henan Polytechnic University, Jiaozuo 454003, China 
WANG Xiaowei 1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
2. Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Jiaozuo 454003, China
3. School of Electrical Engineering, Xi'an University of Technology, Xi'an 710000, China
4. School of Software, Henan Polytechnic University, Jiaozuo 454003, China 
LIU Mengbo 1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
2. Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Jiaozuo 454003, China
3. School of Electrical Engineering, Xi'an University of Technology, Xi'an 710000, China
4. School of Software, Henan Polytechnic University, Jiaozuo 454003, China 
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Abstract:To address the issues of existing line boundary protection schemes, which are easily affected by transition resistance and lack effective parameter setting criteria, a flexible DC power grid line fault protection scheme based on the instantaneous frequency of transient voltage is proposed. First, an improved transient voltage gradient is used as the fault activation criterion. Then, the differences in transient voltage instantaneous frequency between the bus-side and the line-side of current-limiting reactors at both ends of the line under internal and external faults are analyzed. Singular value decomposition (SVD) is used to process the transient voltage signal. The instantaneous frequency (IF) is extracted from the first-level component obtained by the decomposition using the discrete energy separation algorithm (DESA), and a criterion for the internal/external fault is constructed based on the polarity of the integral difference. Finally, fault pole selection is realized according to the strength of the singularity of the second-layer component. Simulation results demonstrate that the proposed scheme can effectively identify fault zones, has strong resistance to transition resistance, and is robust against noise, current-limiting reactor size variations, line length changes, sampling frequency variations, and data synchronization errors.
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