Fault Location in H-Type AC Filters Based on Characteristics of Sudden Current Changes

Wenhai Zhang, Wen Xiao, Shu Zhang () and Yuzhe Li
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Wenhai Zhang: The College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Wen Xiao: The College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Shu Zhang: The College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Yuzhe Li: The College of Electrical Engineering, Sichuan University, Chengdu 610065, China

Energies, 2025, vol. 18, issue 6, 1-21

Abstract: The timely detection and accurate location of capacitor element breakdown faults (CEBFs) are crucial in optimizing the performance of alternating current (AC) filters and ensuring the safety and stable operation of high-voltage direct current transmission systems. In this paper, by analyzing the physical process of CEBFs and the transient fault characteristics, a mapping relationship is established between the initial phase angle of the fault, the direction of sudden changes in unbalanced current, and the current difference on the low-voltage side for CEBFs occurring in different bridge arms. A fault arm localization method is developed for CEBFs in H-type AC filters based on the direction of sudden current changes. This technique is shown to enhance both the location accuracy and reliability compared with previous methods. The feasibility and accuracy of the proposed method are validated through simulations and experimental data.

Keywords: AC filter; capacitor; element breakdown; transient characteristics; fault location; HVDC transmission; converter station (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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