基于线对地导纳等效参数的新能源电站出线保护

IF 2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Yarong Guo, Zexin Zhou, Mingjie Li, Xingguo Wang, Pengfei Lv, Su Yu
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引用次数: 0

摘要

目前的研究发现,现有的线路保护难以解决新能源出线限幅控相故障电流的问题。本文定义了线路对地导纳等效参数的概念,并提出了基于该参数的保护方法。分析了线路内外各种故障类型的线地导纳等效参数的理论表达式。线路对地导纳参数反映了线路在正常运行或区外故障时的电容值,其幅值和电容相位非常小。相反,在区内故障中,具有非常大的振幅和电感或电阻相位,它们反映了过渡电阻的倒数。导纳保护依赖于检测故障前后等效线对地导纳参数的幅值和相位特征的显著变化。该原理不受电源特性变化的影响,非常适用于新能源电站出线故障的识别。这一原理的应用可以推广到传统电力系统的各种电压水平和系统运行方式。它具有显著提高线路保护性能,保证新型电力系统安全稳定运行的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Line Protection for Outgoing Lines of New Energy Power Stations Based on the Equivalent Parameter of Line-to-Ground Admittance

The Line Protection for Outgoing Lines of New Energy Power Stations Based on the Equivalent Parameter of Line-to-Ground Admittance

The present study finds that the existing line protection struggles to address the problem of amplitude-limited and phase-controlled fault currents for new energy outgoing lines. The paper defines the concept of the equivalent parameter of line-to-ground admittance and proposes a protection based on the parameter. The theoretical expressions of the equivalent parameters of line-to-ground admittances are analysed for various fault types on and outside the line. The line-to-ground admittance parameters reflect the line capacitance during normal operation or out-of-zone faults, with a very small amplitude and capacitive phase. Conversely, during in-zone faults, with a very large amplitude and inductive or resistive phase, they reflect the reciprocal of the transition resistance. The admittance protection relies on the detection of significant changes in the amplitude and phase characteristics of equivalent line-to-ground admittance parameters before and after a fault. This principle is not affected by any alterations in the power supply characteristics, making it highly appropriate for identifying faults in the outgoing lines of new energy power stations. The application of this principle can be extended to various voltage levels and system operation modes of conventional power systems. It has the potential to considerably enhance the performances of line protection and ensure both the safety and stability of the new-type power system.

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来源期刊
Iet Generation Transmission & Distribution
Iet Generation Transmission & Distribution 工程技术-工程:电子与电气
CiteScore
6.10
自引率
12.00%
发文量
301
审稿时长
5.4 months
期刊介绍: IET Generation, Transmission & Distribution is intended as a forum for the publication and discussion of current practice and future developments in electric power generation, transmission and distribution. Practical papers in which examples of good present practice can be described and disseminated are particularly sought. Papers of high technical merit relying on mathematical arguments and computation will be considered, but authors are asked to relegate, as far as possible, the details of analysis to an appendix. The scope of IET Generation, Transmission & Distribution includes the following: Design of transmission and distribution systems Operation and control of power generation Power system management, planning and economics Power system operation, protection and control Power system measurement and modelling Computer applications and computational intelligence in power flexible AC or DC transmission systems Special Issues. Current Call for papers: Next Generation of Synchrophasor-based Power System Monitoring, Operation and Control - https://digital-library.theiet.org/files/IET_GTD_CFP_NGSPSMOC.pdf
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