中国电机工程学报2024，Vol.44Issue(12)：4666-4681,中插7,17.DOI:10.13334/j.0258-8013.pcsee.230066
基于电子式电压互感器边界特性分析的35kV配网输电线路单端暂态量保护方案及其整定
The Non-unit Transient-based Protection and Its Settings for 35 kV Distribution Lines Based on the Line Boundary Characteristic of Electronic Voltage Transformer
摘要
Abstract
As a large number of distributed generations are connected to the distribution networks,the performance of traditional three-stage current protection deteriorates seriously.The non-unit transient-based boundary protection is expected to be an effective scheme to improve the relay protection performance of active distribution networks due to its outstanding advantages,such as being independent of power supply property.However,the effectiveness of this approach relies heavily on the strong filtering effect achieved at the line boundary.Therefore,this paper presents that the electronic voltage transformer,the metal-oxide arrester,and the remaining apparatus's stray capacitance of the smart substation and smart switching station can be used together as the line boundary.The excellent high-frequency filtering characteristics of this arrangement can serve as a foundation for the design of non-unit transient-based boundary protection.Then,the protection criterion is constructed due to the difference in the energy of the high-frequency band of the inside-zone and outside-zone fault voltage traveling waves.Based on the reasonable coordination of the setting threshold and the action sequence,a non-unit transient-based two-stage protection is formed.Finally,the proposed protection scheme is performed based on the PSCAD platform to verify its effectiveness,sensitivity,and reliability,which can be coordinated with three-stage current protection to enhance the protection performance in the active distribution network.关键词
配电线路/单端暂态量保护/线路边界/电子式电压互感器/金属氧化物避雷器/智能变电站Key words
distribution lines/non-unit transient-based protection/line boundary/electronic voltage transformer/metal-oxide arrester/smart substation分类
信息技术与安全科学引用本文复制引用
吴宇奇,黎钊,肖澍昱,黄梓欣,李正天,魏繁荣,林湘宁..基于电子式电压互感器边界特性分析的35kV配网输电线路单端暂态量保护方案及其整定[J].中国电机工程学报,2024,44(12):4666-4681,中插7,17.基金项目
国家重点研发计划项目(2021YFB2401000) （2021YFB2401000）
国家电网有限公司科技项目:基于自主芯片的变电站高可靠性保护与监控技术(SGSDDKK00WJJS2200105). National Key R&D Program of China(2021YFB2401000) （SGSDDKK00WJJS2200105）
Science and Technology Project of State Grid Corporation of China:High Reliability Protection and Monitoring Technology of Substation Based on Independent Chip(SGSDDKK00WJJS2200105). （SGSDDKK00WJJS2200105）
