基于特征选择与TCED的UHVDC输电线路故障判定方法
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TM89

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国家电网有限公司科技项目“特高压直流控制保护系统及运维优化关键技术研究与应用”(5210EF180013)


Fault diagnosis method of UHVDC transmission line based on feature selection and TCED
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    摘要:

    针对多端特高压直流(UHVDC)输电线路存在的故障范围广、保护动作易误动等问题,提出基于特征选择与暂态电流能量差(TCED)的多端UHVDC输电线路故障区域判定方法。首先,采用离散小波变换对暂态故障电流进行特征分析,并基于皮尔逊积矩相关系数的母小波选择进行故障匹配。然后,利用故障两侧TCED的特性判别故障方向,通过各换流站故障方向信息确定故障区域。最后,建立四端UHVDC输电线路的PSCAD/EMTDC仿真模型,从故障位置、电阻、距离等方面进行论证。仿真结果表明,文中所提方法能有效区分电力系统暂态扰动与直流故障,准确判定线路故障区域,极大提高检测效率及故障区域判定准确率。

    Abstract:

    In view of problems existing in multi-terminal ultra-high voltage direct current(UHVDC) transmission line, such as wide fault range and easy malfunction of protection actions, a fault diagnosis method based on wavelet transform and transient current energy difference(TCED) is proposed. Firstly, the wavelet transform is used to analyze fault current, and a mother wavelet selection method based on Pearson product-moment correlation coefficient is proposed. Then, the fault direction is determined by characteristics of TCED between two sides of the fault. The fault area is determined by fault direction information of each converter station. Finally, PSCAD / EMTDC simulation model of four terminal UHVDC transmission line is established, and performance of the proposed method is demonstrated in terms of fault location, resistance and distance. The simulation results show that the proposed method can effectively distinguish the power system transient disturbance and DC fault, accurately determine the fault area of the line, sharply improve accuracy of determination and shorten detection time.

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丁津津,汤汉松,高博,张峰,李远松,孙辉.基于特征选择与TCED的UHVDC输电线路故障判定方法[J].电力工程技术,2020,39(3):92-98

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历史
  • 收稿日期:2019-11-15
  • 最后修改日期:2019-12-21
  • 录用日期:2020-03-05
  • 在线发布日期: 2020-06-08
  • 出版日期: 2020-05-28