Adaptive fault identification for multi-level relays using fault tree and user-defined inverse-time characteristics equation

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2025-04-18 DOI:10.1016/j.epsr.2025.111672

Nana Chang , Guobing Song , Jiaheng Jiang

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引用次数: 0

Abstract

The traditional inverse-time overcurrent (ITOC) protection setting method relies on a fixed topology, and the setting workload in large-scale networks is very large and difficult to adapt to topology changes. An adaptive fault identification (AFI) scheme is proposed, which is applicable to ring or large networks, and does not require prior knowledge of the primary/backup coordination relationships between relays or the stepwise setting of inverse-time characteristic parameters. First, the positive sequence fault component voltages (PSFCVs) with natural distribution characteristics is analyzed. By utilizing the communication channels in existing wide-area protection systems (WAPS), only the protection action signal (PAS) of primary protection is transmitted, generating a fault tree that automatically reflects the relationship between each relay and the fault point. Secondly, a user-defined inverse-time characteristic equation (ITCE) and an online adaptive method for setting parameters are provided. The calculated tripping time depends solely on the parameters of the individual lines. Finally, an IEEE 30-bus test system is built in PSCAD/EMTDC to verify the effectiveness of the proposed scheme under different network topologies and when distributed generation (DG) is connected.

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基于故障树和自定义逆时特征方程的多级继电器自适应故障识别

传统的反时过流（ITOC）保护整定方法依赖于固定的拓扑结构，大规模网络中的整定工作量非常大，难以适应拓扑结构的变化。提出了一种适用于环形或大型网络的自适应故障识别方案，该方案不需要预先了解继电器之间的主备协调关系，也不需要逐步设置逆时特征参数。首先，分析了具有自然分布特征的正序故障分量电压。利用现有广域保护系统（wide-area protection system， WAPS）的通信通道，只发送一次保护的保护动作信号（protection action signal， PAS），生成故障树，自动反映各继电器与故障点之间的关系。其次，给出了自定义逆时特征方程（ITCE）和在线自适应参数设置方法；计算出的脱扣时间仅取决于各个线路的参数。最后，在PSCAD/EMTDC上搭建了一个IEEE 30总线测试系统，验证了该方案在不同网络拓扑和分布式发电（DG）连接下的有效性。

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

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.