Dynamic State Estimation Based Protection for Flexible DC Grid

Fast and reliable dc line protection is one of the key techniques for flexible dc grid with the development of flexible dc transmission technology. However, the serious overcurrent caused by dc faults has a prominent contradiction with the weak overcurrent capability of power electronics. In this ar...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2023-03, Vol.70 (3), p.3069-3079
Main Authors: He, Jinghan, Nie, Ming, Li, Meng, Xu, Yin, Luo, Yiping, Zhang, Huiyuan, Meliopoulos, A. P. Sakis
Format: Article
Language:English
Subjects:
CAD
Circuit faults
Computer aided design
Current measurement
Dc fault identification
Dynamic models
dynamic state estimation based protection
Electric power systems
flexible dc grid
frequency-dependent parameters
Frequency-domain analysis
influencing factors
Mathematical models
Overcurrent
Power transmission lines
Redundancy
State estimation
System effectiveness
Transmission line measurements
Transmission lines
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Summary:Fast and reliable dc line protection is one of the key techniques for flexible dc grid with the development of flexible dc transmission technology. However, the serious overcurrent caused by dc faults has a prominent contradiction with the weak overcurrent capability of power electronics. In this article, the high-fidelity dynamic model of the transmission line is first established based on the frequency-dependent characteristic of line parameters. Then, a new dynamic state estimation based protection (DSEBP) scheme is proposed, which uses the redundancy feature of state estimation to improve the dependability of protection. Finally, the actual measurements and the estimated states are compared with the similarity to identify the fault by the chi-square distribution. The proposed method's effectiveness is verified through simulations power systems computer aided design (PSCAD)/electromagnetic transients including DC (EMTDC) and experiments, and the factors affecting the performance of DSEBP are analyzed. Compared with the existing protection methods, the proposed method is more dependable, more sensitive, and available for actual projects.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2022.3172752