Pilot Protection Scheme for Flexible DC Distribution Network Based on Improved Jaccard Coefficient

被引：0
|
作者：
Wei L. [1 ]
Li B. [1 ]
Liao K. [1 ]
Yang J. [1 ]
He Z. [1 ]
机构：
[1] School of Electrical Engineering, Southwest Jiaotong University, Chengdu
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2023年 / 47卷 / 22期
关键词：
Apollo curve smoothing algorithm; flexible DC distribution network; improved Jaccard coefficient; pilot protection; synchronization error;
D O I：
10.7500/AEPS20221103004
中图分类号：
学科分类号：
摘要：
The pilot protection has the advantage of high selectivity, which is one of the main protection types for the flexible DC distribution network. However, the pilot protection requires high-quality data from both ends, so there are some problems such as limited available data and susceptible to synchronization errors. In this paper, a pilot protection scheme based on the improved Jaccard coefficient for flexible DC distribution networks is proposed to improve data availability and reduce the need for information synchronization. Firstly, by deriving the expressions of fault currents at both ends with the internal and external faults, the characteristic differences of the intersection part of the absolute values of the currents at both ends are derived. Secondly, a simplified Apollo curve smoothing algorithm is used for pre-processing. The difference in intersection characteristics is quantified by using the improved Jaccard coefficients of absolute values of currents at both ends, and the protection action criterion is constructed. Finally, a four-terminal annular DC distribution network is built based on PSCAD/EMTDC for simulation and verification. The simulation results show that the proposed pilot protection scheme can reliably discriminate internal and external faults and has high resistance to transition resistance, noise interference and synchronization error. © 2023 Automation of Electric Power Systems Press. All rights reserved.
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页码：75 / 86
页数：11
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