Rapid Pilot Protection for LCC-HVDC Transmission Lines Utilizing Specific Frequency Measured Impedance Characteristics

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery Pub Date : 2025-04-11 DOI:10.1109/TPWRD.2025.3560080

Zhen Liu;Houlei Gao;Fang Peng;Yuewei Fan

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Abstract

To address the issues of slow operation speed, high synchronization requirements, and susceptibility to the influence of distributed capacitance in existing pilot protection for LCC-HVDC transmission lines, a novel pilot protection method utilizing the measured impedance characteristics is proposed. Measured impedance is utilized to characterize the frequency-domain differences under various fault conditions. Under forward fault conditions, the measured impedance exhibits purely capacitive or purely inductive characteristics within a specific frequency band. Under reverse fault conditions, the measured impedance corresponds to the transmission line wave impedance, with the line-mode wave impedance stabilizing within a specific frequency band, where the imaginary part much smaller than the real part. Leveraging the characteristics, a pilot protection scheme is proposed. Simulation analysis shows that the protection method can fast and correctly identify faults, withstand fault impedances of up to 900 Ω, is unaffected by distributed capacitance, and has low synchronization requirements on both sides. The method is capable of being applied as a rapid backup protection for long-distance LCC-HVDC transmission lines.

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基于特定频率测量阻抗特性的LCC-HVDC输电线路快速先导保护

针对现有LCC-HVDC线路中导保护运行速度慢、同步要求高、易受分布电容影响等问题，提出了一种利用实测阻抗特性进行中导保护的新方法。利用测量阻抗来表征各种故障条件下的频域差异。在正向故障条件下，测量的阻抗在特定频段内表现出纯电容性或纯电感性特性。在反向故障条件下，测得的阻抗与传输线波阻抗相对应，线模波阻抗稳定在特定频段内，虚部远小于实部。利用该特性，提出了一种试验保护方案。仿真分析表明，该保护方法能够快速准确地识别故障，可承受高达900 Ω的故障阻抗，不受分布式电容的影响，且对两侧同步要求低。该方法可作为长距离LCC-HVDC输电线路的快速后备保护。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Power Delivery 工程技术-工程：电子与电气

CiteScore

9.00

自引率

13.60%

发文量

513

审稿时长

6 months

期刊介绍： The scope of the Society embraces planning, research, development, design, application, construction, installation and operation of apparatus, equipment, structures, materials and systems for the safe, reliable and economic generation, transmission, distribution, conversion, measurement and control of electric energy. It includes the developing of engineering standards, the providing of information and instruction to the public and to legislators, as well as technical scientific, literary, educational and other activities that contribute to the electric power discipline or utilize the techniques or products within this discipline.