| 引用本文: | 余修勇,肖立业.基于数学形态学的多端柔性直流系统故障测距方案[J].电力自动化设备,2020,40(1): |
| YU Xiuyong,XIAO Liye.Fault location scheme for multi-terminal MMC-HVDC system based on mathematical morphology[J].Electric Power Automation Equipment,2020,40(1): |
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| 摘要: |
| 通过分析多端柔性直流系统直流线路故障后故障电压行波的传播特点，利用能够同时检测信号突变时刻和突变极性的数学形态学滤波器，设计采用双端信号进行故障测距的方案。通过对行波波头间隔取均值，提高了在线路端口附近故障时的测距精度。利用估计的行波速度，确定行波波头的查找区间，提高了测距的抗干扰能力。该方法无需线路参数信息和两端数据同步，采样频率要求较低，抗噪声能力强。搭建了三端柔性直流系统进行仿真分析，仿真结果表明所提故障测距方案在各种情况下均可得到较高精度的测距结果。 |
| 关键词: 柔性直流系统 数学形态学滤波器 行波极性 故障检测 故障测距 过渡电阻 |
| DOI：10.16081/j.epae.201912030 |
| 分类号:TM721.1;TM773 |
| 基金项目:国家自然科学基金资助项目(51721005)；中国科学院前沿科学重点研究项目(QYZDJ-SSW-JSC025) |
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| Fault location scheme for multi-terminal MMC-HVDC system based on mathematical morphology |
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YU Xiuyong1,2,3, XIAO Liye1,2,3
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1.Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;2.College of Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3.Key Laboratory of Applied Superconductivity, Chinese Academy of Sciences, Beijing 100190, China
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| Abstract: |
| On the basis of analyzing the characteristics of fault voltage traveling wave propagation in multi-terminal MMC-HVDC(Modular Multilevel Converter based High Voltage Direct Current) after DC line fault, a fault location scheme using two-terminal signal is designed by using a MMF(Mathematical Morphological Filter) which can simultaneously detect both sudden change time and sudden change polarity of the signal. By averaging the time interval of the wave head, the location accuracy is further improved when faults are near the end of the line. By using the estimated traveling wave velocity, the searching range of traveling wave head is determined, which improves the anti-interference ability. The proposed method does not need the synchronization of line parameters and two-terminal data, and has low sampling frequency requirement and strong anti-noise capability. A three-terminal MMC-HVDC is built for simulation analysis, and the simulative results demonstrate that the proposed fault location scheme can achieve high accuracy in all cases. |
| Key words: MMC-HVDC system MMF traveling wave polarity fault detection electric fault location transition resistance |
