| 引用本文: | 郝勇奇,王倩,周士琼,吕潇,刘东霖.基于LMD与Teager能量算子的VSC-HVDC输电线路故障定位[J].电力系统保护与控制,2017,45(1):81-88.[点击复制] |
| HAO Yongqi,WANG Qian,ZHOU Shiqiong,Lü Xiao,LIU Donglin.Fault location for VSC-HVDC transmission lines based on LMD and Teager energy operator[J].Power System Protection and Control,2017,45(1):81-88[点击复制] |
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| 摘要: |
| 为保证电压源换流器型高压直流输电系统的可靠运行，克服传统高压直流输电行波定位具有易误动、受噪声影响大的缺点，提出了基于于局域均值分解(LMD)与Teager能量算子结合的故障定位新方法。通过Morlet小波时频分析确定了电压源换流器型直流输电，VSC-HVDC的边界特性，提出了基于PF分量能量比值的区内、外故障识别判据。利用故障极线路与非故障极线路中高频电流分量的差异构造了选极判据。对于区内故障将LMD与Teager能量算子结合进行故障测距。PSCAD仿真结果表明，该方法定位精度误差不超过0.124%且耐过渡电阻。通过增添噪声影响验证了该算法和判据的可靠性，故该方案可实现VSC-HVDC的全线、准确的故障定位。 |
| 关键词: 电压源换流器型高压直流输电 LMD Teager能量算子 故障定位 行波 |
| DOI：10.7667/PSPC160024 |
| 投稿时间：2016-01-16修订日期：2016-03-04 |
| 基金项目: |
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| Fault location for VSC-HVDC transmission lines based on LMD and Teager energy operator |
| HAO Yongqi,WANG Qian,ZHOU Shiqiong,LÜ Xiao,LIU Donglin |
| (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China) |
| Abstract: |
| Traditional HVDC traveling waves location are easy to malfunction, and are seriously affected by the noise. In order to ensure reliable operation of the voltage source converter HVDC (VSC-HVDC) system, this paper proposes a new combination of Teager energy operator and local mean decomposition (LMD) in the fault location. By the time-frequency analysis of the Morlet wavelet to determine the characteristics of boundaries in the VSC-HVDC, this paper proposes an identification criterion of internal and external faults based on the ratio of PF component energy area. The differential of high-frequency current between fault line and non-fault line is used as the criterion of choosing pole. For the internal fault ranging, the Teager energy operator is combined with LMD. The simulation results show that the maximum fault location error of the proposed algorithm is not more than 0.124%, and it is not affected by the fault resistance. By adding noise, it is verified the reliability of the proposed method and criteria, so that the program can achieve the full range of VSC-HVDC accurate positioning. |
| Key words: VSC-HVDC LMD Teager energy operator fault location traveling wave |
