Non-unit protection method for boundary-component-free MTDC systems using normalized backward traveling waves

Fan Xie, Le Liu, Zhiguo Hao*, Ting Wang, Songhao Yang, Aleksandra Lekić, Marjan Popov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Downloads (Pure)

Abstract

The performance of existing protection methods for multi-terminal direct current systems depends on the availability and sizes of boundary components. To overcome the limitation, this paper proposes a non-unit DC line protection method based on the normalized backward traveling waves (BTWs) of the 1-mode voltage. Firstly, traveling wave propagation characteristics are analyzed, and a rationalization approach based on vector fitting is proposed. Next, the analytical expressions of normalized BTWs are derived, with the negative correlation between them and fault distance proved. Then, the derivative-free conjugate gradient algorithm is utilized for amplitude fitting and normalization calculation. Finally, a non-unit protection method using the normalized BTWs is developed. The performance is validated for both electromagnetic transient PSCAD/EMTDC and real-time digital RSCAD/RTDS simulation. The results demonstrate that the proposed method can accurately identify faults with various fault resistances and locations without requiring boundary components and high sampling frequencies, and it is robust against noise disturbances.

Original languageEnglish
Article number110370
Number of pages12
JournalInternational Journal of Electrical Power and Energy Systems
Volume164
DOIs
Publication statusPublished - 2025

Keywords

  • Derivative-free conjugate gradient algorithm
  • Multi-terminal DC system
  • Non-unit protection
  • Traveling wave
  • Vector fitting algorithm

Fingerprint

Dive into the research topics of 'Non-unit protection method for boundary-component-free MTDC systems using normalized backward traveling waves'. Together they form a unique fingerprint.

Cite this