Harmonic Blocking Based Differential Relay Protection Considering Neutral Stray Currents from DC Metro Systems

IF 6.1 1区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of Modern Power Systems and Clean Energy Pub Date : 2025-03-27 DOI:10.35833/MPCE.2024.000440

Haoran Fan;Sheng Lin;Aimin Wang;Qi Zhou;Hongbo Cheng

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引用次数: 0

Abstract

Stray currents from DC metro systems intrude into the grounded neutrals of large power transformers, posing a major threat to the differential relay protection of transformer. In this paper, the performance of harmonic blocking based differential relay protection considering neutral stray currents (NSCs) from DC metro systems is thoroughly investigated. The findings reveal that relays may fail to clear internal faults in some scenarios because they are blocked due to NSC-induced harmonic currents. To improve the reliability of differential relay protection, a method for preventing incorrect operation is proposed using a skewness-based criterion to detect the presence of NSCs. Then, the relay is unblocked when an internal fault is simultaneously detected by the novel internal fault detection block. The proposed method is resistant to current transformer saturation and accounts for NSC fluctuations. Various time-domain simulations conducted in PSCAD/EMTDC verify the effectiveness of the proposed method.

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考虑直流地铁中性点杂散电流的谐波隔离差动继电保护

直流地铁系统杂散电流侵入大型电力变压器接地中性点，对变压器差动继电保护构成重大威胁。本文深入研究了考虑直流地铁系统中性杂散电流的谐波隔离差动继电保护的性能。研究结果表明，在某些情况下，继电器可能无法清除内部故障，因为它们由于nsc诱导的谐波电流而被阻塞。为了提高差动继电保护的可靠性，提出了一种利用基于偏度的判据来检测NSCs存在的防止误操作的方法。然后，当内部故障同时被新型内部故障检测块检测到时，继电器解除阻塞。该方法具有抗电流互感器饱和和NSC波动的特点。在PSCAD/EMTDC中进行的各种时域仿真验证了该方法的有效性。

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

Journal of Modern Power Systems and Clean Energy ENGINEERING, ELECTRICAL & ELECTRONIC-

CiteScore

12.30

自引率

14.30%

发文量

审稿时长

13 weeks

期刊介绍： Journal of Modern Power Systems and Clean Energy (MPCE), commencing from June, 2013, is a newly established, peer-reviewed and quarterly published journal in English. It is the first international power engineering journal originated in mainland China. MPCE publishes original papers, short letters and review articles in the field of modern power systems with focus on smart grid technology and renewable energy integration, etc.