文章摘要
杨亚超,黄纯,江亚群,等.MMC-HVDC输电线路双端非同步故障测距方法[J].电力系统自动化,2018,42(16):148-154. DOI: 10.7500/AEPS20171112006.
YANG Yachao,HUANG Chun,JIANG Yaqun, et al.Two-terminal Asynchronous Fault Location Method for MMC-HVDC Transmission Line[J].Automation of Electric Power Systems,2018,42(16):148-154. DOI: 10.7500/AEPS20171112006.
MMC-HVDC输电线路双端非同步故障测距方法
Two-terminal Asynchronous Fault Location Method for MMC-HVDC Transmission Line
DOI:10.7500/AEPS20171112006
关键词: 直流输电线路  双端故障测距  模块化多电平换流器  非同步测量
KeyWords: DC transmission line  two-terminal fault location  modular multilevel converter(MMC)  asynchronous measurement
上网日期:2018-07-24
基金项目:国家自然科学基金资助项目(51677060)
作者单位E-mail
杨亚超 湖南大学电气与信息工程学院, 湖南省长沙市 410082  
黄纯 湖南大学电气与信息工程学院, 湖南省长沙市 410082 yellowpure@hotmail.com 
江亚群 湖南大学电气与信息工程学院, 湖南省长沙市 410082  
刘鹏辉 湖南大学电气与信息工程学院, 湖南省长沙市 410082  
汤涛 湖南大学电气与信息工程学院, 湖南省长沙市 410082  
摘要:
      提出了一种基于模块化多电平变换器的高压直流(MMC-HVDC)输电线路双端非同步故障测距方法。首先,通过分析MMC-HVDC系统直流侧线路故障时的电流环路,将跳闸后的双端MMC的两侧环路分别等效为RLC串联电路,并先后控制双端MMC桥臂子模块的投入,为两侧RLC串联电路提供一个初始电压;然后根据RLC电路的零输入响应特性,分别提取双端MMC子模块电容电流的最大值以及该时刻的电压;最后利用双端非同步测量的数据计算故障距离。该方法不依赖于电容的初始电压,并且不受过渡电阻影响,可重复测量,提高了测距的可靠性。在PSCAD/EMTDC 中搭建了21电平的MMC-HVDC模型,并对所提故障测距方法进行仿真,验证了其有效性。
Abstract:
      This paper presents a new two-terminal asynchronous fault location method for modular multilevel converter based high voltage direct current(MMC-HVDC)transmission line. Firstly, by analyzing the current path of the MMC-HVDC system under line fault, the two side loops of the two-terminal MMC after tripping are equivalent to RLC series circuits. Then the two-terminal MMC bridge submodules are put in, which provide initial voltages for the RLC series circuits. According to the zero-input response characteristics of RLC circuit, the maximum value of the capacitor current and the corresponding capacitor voltage of the two-terminal MMC submodules are obtained respectively. Finally, the fault distance is calculated by using the asynchronous measurement data. The method does not depend on the initial capacitor voltage and is not affected by the transition resistance, and the fault distance can be measured repeatedly which can improve the reliability. A 21-level MMC-HVDC model is built by PSCAD/EMTDC, and the simulation results show that the proposed fault location method is effective.
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