QUAN Wenjie,TONG Xiaoyang,ZHANG Guangxiao.Single-end Flexible DC Protection Scheme Based on Similarity of S-transform Energy Spectrum Matrix of Traveling Wave[J].Automation of Electric Power Systems,2022,46(7):178-186.
QUAN Wenjie,TONG Xiaoyang,ZHANG Guangxiao.Single-end Flexible DC Protection Scheme Based on Similarity of S-transform Energy Spectrum Matrix of Traveling Wave[J].Automation of Electric Power Systems,2022,46(7):178-186. DOI: 10.7500/AEPS20210621008.
Single-end Flexible DC Protection Scheme Based on Similarity of S-transform Energy Spectrum Matrix of Traveling Wave
and operation refusal on remote high-resistance internal fault of the existing flexible DC line protection
this paper proposes a single-end protection scheme for the flexible DC transmission line based on the similarity of energy spectrum matrix of traveling waves. By analyzing the boundary effect of current limiting inductors in the flexible DC power grid
the difference of voltage traveling waves of internal and external faults in time and frequency domains is obtained. The S-transform is used to construct the energy spectrum matrix to increase the difference of energy spectrum distribution between internal and external faults. The principal components analysis is used to reduce the dimension and the storage space of sample data. By using the normalized cross-correlation coefficient
the similarity between the fault energy spectrum matrix and the fault sample matrix is calculated
and the single-end flexible DC protection criterion is constructed to distinguish the internal and external faults. Considering the factor that overhead lines are vulnerable to lightning
the lightning interference identification criterion is constructed. Simulation results show that the proposed algorithm is not affected by the fault location
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