Sihua Wang1, Gaofei Zheng This email address is being protected from spambots. You need JavaScript enabled to view it.1, Yougeng Zhao1, Wenhui Zhang1, and Xujie Li1

1School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China


 

Received: December 18, 2021
Accepted: February 21, 2022
Publication Date: April 29, 2022

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.6180/jase.202302_26(2).0004  


ABSTRACT


Accurate identification and location of faults on the DC side are technical difficulties to be solved urgently for the multi-terminal VSC-HVDC grids. Firstly, the characteristics of line boundary are analyzed, using the obvious difference of the current high-frequency transient energy during the internal and external faults to locate the fault. Secondly, the polarity difference of the transient voltage of the current-limiting reactor is used as the direction identification criterion for line protection. Considering the effect of different transition resistance and circuit breaker breaking process. The line protection is realized by single-terminal quantity, and the fault isolation is realized by coordination among circuit breakers. The simulation verifies that the proposed protection scheme can quickly and reliably identify different distances and different types of faults, meet the protection speed and reliability requirements, and have strong transition resistance and anti-interference capabilities.


Keywords: multi-terminal VSC-HVDC grids; wavelet transform; hybrid DC circuit breaker; fault identification; coordinate protection.


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