A single-ended protection scheme for the hybrid MTDC power grid using traveling wave peak-to-decline ratio

IF 5 2区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Electrical Power & Energy Systems Pub Date : 2025-05-01 DOI:10.1016/j.ijepes.2025.110702

Zijiang Wang , Zhaoyi Zhang , Jianbin Fan , Xinyue Zheng , Youping Fan

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引用次数: 0

Abstract

For multi-terminal HVDC(MTDC) power grids, boundary elements may not exist at the transmission line terminal, which makes traditional traveling wave protection schemes unsuitable. Furthermore, most traveling wave protection schemes require a high sampling frequency to detect the traveling wave heads and are not sensitive to the high-resistance ground fault. To solve these problems, a single-ended protection scheme using the traveling wave peak-to-decline ratio is proposed in this research. The 1-mode traveling wave propagation characteristics of different measuring points are first analyzed. Then, the peak-to-decline ratio and the change value of the 1-mode traveling wave are applied to construct the fault line identification criterion at the end of the DC line and the common point between two DC lines, respectively. Finally, the proposed protection scheme is verified by a hybrid three-terminal HVDC power grid. Results show that the proposed protection scheme only requires a 10 kHz sampling frequency, and the ground fault with 800 Ω fault resistance or 40 dB noise interference can be identified correctly.

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基于行波峰降比的MTDC混合电网单端保护方案

对于多端子HVDC（MTDC）电网，输电线路末端可能不存在边界元，这使得传统的行波保护方案不适合。此外，大多数行波保护方案需要高采样频率来检测行波头，并且对高电阻接地故障不敏感。针对这些问题，本文提出了一种基于行波峰降比的单端保护方案。首先分析了不同测点的一模行波传播特性。然后，利用峰降比和一模行波变化值分别构建直流线路末端和两直流线路之间共点的故障线识别判据。最后，通过三端混合直流电网对所提出的保护方案进行了验证。结果表明，该保护方案只需10 kHz采样频率，就能正确识别出800 Ω故障电阻或40 dB噪声干扰的接地故障。

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

International Journal of Electrical Power & Energy Systems 工程技术-工程：电子与电气

CiteScore

12.10

自引率

17.30%

发文量

1022

审稿时长

51 days

期刊介绍： The journal covers theoretical developments in electrical power and energy systems and their applications. The coverage embraces: generation and network planning; reliability; long and short term operation; expert systems; neural networks; object oriented systems; system control centres; database and information systems; stock and parameter estimation; system security and adequacy; network theory, modelling and computation; small and large system dynamics; dynamic model identification; on-line control including load and switching control; protection; distribution systems; energy economics; impact of non-conventional systems; and man-machine interfaces. As well as original research papers, the journal publishes short contributions, book reviews and conference reports. All papers are peer-reviewed by at least two referees.