随着我国综合实力的提升,电力系统向着高电压、大容量的方向发展。针对高压输电线路发生短路故障后需及时确定故障位置的问题,提出一种基于线路双端同步响应的故障定位方法。通过研究高压输电线路发生短路故障后的线路双端响应特性,推...随着我国综合实力的提升,电力系统向着高电压、大容量的方向发展。针对高压输电线路发生短路故障后需及时确定故障位置的问题,提出一种基于线路双端同步响应的故障定位方法。通过研究高压输电线路发生短路故障后的线路双端响应特性,推导出本文基于双端同步响应的故障定位法。利用广域测量系统(WAMS)提取线路线端关键响应信息,以筛选故障支路、排除可能存在的线路双端响应相同的伪故障区域,实现输电线路的准确定位。在NEW ENGLAND 10机39节点系统中进行仿真测试及实例验证,结果表明所提方法能有效排除伪故障区域实现故障定位,是一种准确有效的故障定位方法。展开更多
基频调制电流源换流器(fundamental frequency modulation-based current sourced converter,FFM-CSC)作为一种新型电流源换流器,能够解决传统直流输电工程面临的换相失败及无功消耗问题,兼具电流源和电压源换流器部分优势。直流线路接...基频调制电流源换流器(fundamental frequency modulation-based current sourced converter,FFM-CSC)作为一种新型电流源换流器,能够解决传统直流输电工程面临的换相失败及无功消耗问题,兼具电流源和电压源换流器部分优势。直流线路接地作为直流系统中几乎最严重的故障,针对FFM-CSC换流站短路过程研究缺乏定量分析,不利于系统参数设计和故障保护识别,限制了FFM-CSC的推广应用。论文针对双极12脉动FFM-CSC系统,建立短路故障等效电路,推导故障初期过电流的解析计算公式;并针对直流线路短路特点,提出基于单端监测量的保护算法,可作为直流线路主保护。该算法计算要求低,数学原理清晰,可随系统参数和运行工况的改变灵活调整。最后,基于PSCAD/EMTDC仿真软件搭建FFM-CSC直流系统详细模型,验证数学表达式准确性,同时证明保护算法的安全可靠性。展开更多
Based on the transmission line theory of the buried metallic structures, the concerned harmful effects to the buried oil and natural gas pipelines caused by the power line short-circuit fault are further discussed. A ...Based on the transmission line theory of the buried metallic structures, the concerned harmful effects to the buried oil and natural gas pipelines caused by the power line short-circuit fault are further discussed. A closed-form expression of the induced voltage caused by the short-circuit fault of the ultra-high voltage power （UHVAC） transmission line is given. The transmission line model of the buried pipeline is set up and a set of formulas for calculating induced voltage on the pipeline and the parameters of the buried pipeline in actual environment condition are given. At last, the characteristic of the harm^hl effects on the buried pipeline from the power line short-circuit fault are discussed.展开更多
文摘随着我国综合实力的提升,电力系统向着高电压、大容量的方向发展。针对高压输电线路发生短路故障后需及时确定故障位置的问题,提出一种基于线路双端同步响应的故障定位方法。通过研究高压输电线路发生短路故障后的线路双端响应特性,推导出本文基于双端同步响应的故障定位法。利用广域测量系统(WAMS)提取线路线端关键响应信息,以筛选故障支路、排除可能存在的线路双端响应相同的伪故障区域,实现输电线路的准确定位。在NEW ENGLAND 10机39节点系统中进行仿真测试及实例验证,结果表明所提方法能有效排除伪故障区域实现故障定位,是一种准确有效的故障定位方法。
文摘基频调制电流源换流器(fundamental frequency modulation-based current sourced converter,FFM-CSC)作为一种新型电流源换流器,能够解决传统直流输电工程面临的换相失败及无功消耗问题,兼具电流源和电压源换流器部分优势。直流线路接地作为直流系统中几乎最严重的故障,针对FFM-CSC换流站短路过程研究缺乏定量分析,不利于系统参数设计和故障保护识别,限制了FFM-CSC的推广应用。论文针对双极12脉动FFM-CSC系统,建立短路故障等效电路,推导故障初期过电流的解析计算公式;并针对直流线路短路特点,提出基于单端监测量的保护算法,可作为直流线路主保护。该算法计算要求低,数学原理清晰,可随系统参数和运行工况的改变灵活调整。最后,基于PSCAD/EMTDC仿真软件搭建FFM-CSC直流系统详细模型,验证数学表达式准确性,同时证明保护算法的安全可靠性。
基金supported by the National Natural Science Foundation of China(60671055,61171051)the Doctorate Foundation of the Ministry of Education of China(200700130046)
文摘Based on the transmission line theory of the buried metallic structures, the concerned harmful effects to the buried oil and natural gas pipelines caused by the power line short-circuit fault are further discussed. A closed-form expression of the induced voltage caused by the short-circuit fault of the ultra-high voltage power （UHVAC） transmission line is given. The transmission line model of the buried pipeline is set up and a set of formulas for calculating induced voltage on the pipeline and the parameters of the buried pipeline in actual environment condition are given. At last, the characteristic of the harm^hl effects on the buried pipeline from the power line short-circuit fault are discussed.
