MMC-HVDC输电线路双端非同步故障测距方法

YANG Yachao

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MMC-HVDC输电线路双端非同步故障测距方法

更新时间：2025-08-13

- MMC-HVDC输电线路双端非同步故障测距方法
- Automation of Electric Power Systems Vol. 42, Issue 16, Pages: 148-154(2018)
- 作者机构：
  
  湖南大学电气与信息工程学院,湖南省,长沙市,410082
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- Published：2018
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YANG Yachao. [J]. Automation of electric power systems, 2018, 42(16): 148-154.
DOI：

YANG Yachao. [J]. Automation of electric power systems, 2018, 42(16): 148-154. DOI：

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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