电工技术学报  2021, Vol. 36 Issue (1): 203-214    DOI: 10.19595/j.cnki.1000-6753.tces.191546
电力系统 |
基于交叉重叠差分变换的MMC-HVDC线路故障识别方法
束洪春, 代月, 安娜, 田鑫萃, 王广雪
昆明理工大学电力工程学院 昆明 650500
Fault Identification Method of MMC-HVDC Line Based on Sequential Overlapping Derivative Transform
Shu Hongchun, Dai Yue, An Na, Tian Xincui, Wang Guangxue
Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming 650500 China
全文: PDF (1523 KB)   HTML
输出: BibTeX | EndNote (RIS)      
摘要 在基于模块化多电平换流器(MMC)的柔性直流输电系统中,高效可靠地识别线路故障是系统安全经济运行的重要保证之一。为快速可靠识别线路故障,提出一种基于交叉重叠差分(SOD)变换的区内外故障识别方法。首先分析MMC等效阻抗模型形成的物理边界对高频分量的衰减作用,当线路发生内部故障时,其故障电压起始变化陡峭、幅值大、长时窗时域波形有振荡;当线路发生外部故障时,其故障电压起始变化平缓、幅值小。其次利用交叉重叠差分对故障电压和故障电流进行变换,变换后的电压和电流信号相乘得到SP,定义K为SP绝对值的最大值,根据K值判断区内外故障。在PSCAD/EMTDC上搭建MMC-HVDC系统仿真模型,仿真结果表明,该方法能可靠准确地识别区内外故障,速动性好,具有较强的耐过渡电阻能力和适用性。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
束洪春
代月
安娜
田鑫萃
王广雪
关键词 高压直流输电模块化多电平换流器物理边界交叉重叠差分变换故障特性分析故障识别    
Abstract:In the high voltage direct current transmission based on modular multilevel converter (MMC) system, identifying line faults efficiently and reliably was one of the important guarantees for the safe and economic operation of the system. In order to identify line faults quickly and reliably, an internal and external fault identification method based on sequential overlapping derivative(SOD) transform was proposed. This paper first analyzes the physical boundary formed by the MMC equivalent impedance model, which has a strong attenuation effect on high frequency components, the start voltage caused by the line fault changes steeply when amplitude is large and the time-domin waveform isshowen shaking violently;the the start voltage caused by the external fault changes gently and amplitude is small. Secondly, the SOD transformation is used to transform the fault voltage and current. The converted voltage and current signal are multiplied to obtain SP, and K is defined as the maximum value of the absolute value of SP, and the internal and external faults are determined according to the K value. The MMC-HVDC system simulation model is built on PSCAD/EMTDC. The simulation results show that the method , which has good quick action, certain resistance to transition resistance and strong applicability ,can reliably and accurately identify internal faults and external faults.
Key wordsHVDC    modular multilevel converter    physical boundary    sequential overlapping derivative transform    fault characteristic analysis    fault identification   
收稿日期: 2019-11-22     
PACS: TM723  
基金资助:国家自然科学基金(51807084、52037003)和云南省重大专项(202002AF080001)资助项目
通讯作者: 安娜,女,1985年生,博士研究生,研究方向为输变电设备及自动化。E-mail:anna073000@163.com   
作者简介: 束洪春,男,1961年生,博士,教授,博士生导师,研究方向为电力系统新型继电保护与故障测距、故障录波、数字信号处理及DSP应用等。E-mail:kmshc@sina.com.cn
引用本文:   
束洪春, 代月, 安娜, 田鑫萃, 王广雪. 基于交叉重叠差分变换的MMC-HVDC线路故障识别方法[J]. 电工技术学报, 2021, 36(1): 203-214. Shu Hongchun, Dai Yue, An Na, Tian Xincui, Wang Guangxue. Fault Identification Method of MMC-HVDC Line Based on Sequential Overlapping Derivative Transform. Transactions of China Electrotechnical Society, 2021, 36(1): 203-214.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.191546          https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I1/203