Differential Protection Method for Active Distribution Network Based on Frechet Distance Algorithm

The access of a large number of distributed generation (DG) changes the structure and fault characteristics, and the traditional protection methods face many challenges. Therefore, this article proposes a current differential protection method (CDP) that compares the waveform differences between the...

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Bibliographic Details
Published in2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2) pp. 2695 - 2699
Main Authors Li, Haiyong, Tian, Junyang, Shen, Zizheng, Ding, Jingming, Zou, Guibin, Huang, Chao
Format Conference Proceeding
LanguageEnglish
Published IEEE 15.12.2023
Subjects
Active distribution networks
current differential protection
Distributed generation component
Distributed power generation
Energy Internet
Fault diagnosis
frechet distance
Protection
Simulation
System integration
waveform similarity
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Summary:The access of a large number of distributed generation (DG) changes the structure and fault characteristics, and the traditional protection methods face many challenges. Therefore, this article proposes a current differential protection method (CDP) that compares the waveform differences between the two ends of the line. When a fault occurs, the current waveforms at both ends of each line are extracted and normalized. Then the frechet distance algorithm is introduced to quantify the waveform similarity. Finally, based on the calculation results of the frechet distance, the braking coefficient of the CDP is constructed to achieve reliable discrimination of faulty line. A simulation model is built in PSCAD to verify the proposed method. The simulation results show that the proposed method is not affected by the fault type and the grid-connected capacity of DG, and can correctly identify faults with good reliability and selectivity.
DOI:10.1109/EI259745.2023.10512545