Novel Fault Protection Method for Flexible DC Power Systems

A fault protection method is proposed for flexible direct-current (DC) power systems based on the cosine similarity of currents in current-limiting reactors. The typical characteristics of external and internal faults in a flexible DC power system were analyzed. The principles of cosine similarity a...

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Bibliographic Details
Published inEnergies (Basel) Vol. 17; no. 14; p. 3446
Main Authors Chen, Genqi, Duan, Qing, Zhao, Caihong, Wang, Haoqing, Sha, Guanglin, Gao, Jian, Li, Yong, Zhou, Shuiliang
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2024
Subjects
Accuracy
Analysis
cosine similarity
current-limiting reactor
Electric power systems
external fault
flexible DC power systems
internal fault
Methods
Reactors
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Summary:A fault protection method is proposed for flexible direct-current (DC) power systems based on the cosine similarity of currents in current-limiting reactors. The typical characteristics of external and internal faults in a flexible DC power system were analyzed. The principles of cosine similarity and the fault current characteristics of current-limiting reactors were used to distinguish between internal and external faults. The ratio of the average positive and negative voltages of the current-limiting reactor was then used to distinguish the fault types and fault line. Finally, a simulation model of a circular flexible DC power system was constructed using MATLAB/Simulink software (2018b). The simulation results show that the proposed protection scheme can quickly and accurately identify the location and type of faults, and has a strong ability to withstand fault resistance and is less affected by distributed capacitance, noise, and communication delay.
ISSN:1996-1073
1996-1073
DOI:10.3390/en17143446