A Frequency-domain pilot protection method considering instrument transformer characteristics

IF 4.2 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2025-09-15 DOI:10.1016/j.epsr.2025.112191

Jifei Yan, Pengfei Liu, Zhongxue Chang, Guobing Song, Xiaoping Gao

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引用次数: 0

Abstract

The sensitivity of traditional current differential protection may decrease or even lead to maloperation due to the frequency deviation and limited amplitude characteristics of fault currents from power electronic-based power supplies. To solve aforementioned challenges, this study presents a fast frequency-domain pilot protection method based on line model consistency identification. This approach distinguishes between internal and external faults through transient voltage and current measurements while comprehensively accounting for the frequency response characteristics of instrument transformers. First, the mathematical relationships governing the secondary voltage and current under internal and external faults are rigorously established. Subsequently, the complex frequency-domain components of the transient voltage and current are extracted by applying of the numerical Laplace transform. Then, a consistency criterion for the line model is established, accompanied by a comprehensive protection scheme. Finally, extensive numerical simulations are conducted to validate the effectiveness of the method. Compared with existing approaches, the proposed method functions independently of the output power level of the power supplies at both ends and demonstrates superior robustness against high fault resistance and strong noise interference. In addition, the proposed method exhibits a light computational burden and requires low sampling rates.

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考虑仪表变压器特性的频域导频保护方法

由于电力电子电源故障电流的频率偏差和限幅特性，传统电流差动保护的灵敏度可能会降低甚至导致误动作。针对上述问题，本文提出了一种基于线模一致性识别的频域快速导频保护方法。该方法通过瞬态电压和电流测量来区分内部和外部故障，同时综合考虑仪表变压器的频率响应特性。首先，严格建立了内部和外部故障情况下控制二次电压和电流的数学关系。然后，应用数值拉普拉斯变换提取瞬态电压和电流的复频域分量。然后，建立了线路模型的一致性准则，并给出了综合保护方案。最后进行了大量的数值模拟，验证了该方法的有效性。与现有方法相比，该方法不受两端电源输出功率的影响，对高故障抗力和强噪声干扰具有较强的鲁棒性。此外，该方法计算量小，采样率低。

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

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.