基于暂态功率脉冲因子的柔性直流输电线路故障检测  

Fault detection of flexible DC transmission lines based on transient power pulse factor

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作  者:曾志辉[1,2] 郑莹莹 韦延方 王晓卫[3] 李佳音 ZENG Zhihui;ZHENG Yingying;WEI Yanfang;WANG Xiaowei;LI Jiayin(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,China;Henan Provincial Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment,Jiaozuo 454003,China;School of Electrical Engineering,Xi’an University of Technology,Xi’an 710000,China)

机构地区:[1]河南理工大学电气工程与自动化学院,河南焦作454003 [2]河南省煤矿装备智能检测与控制重点实验室,河南焦作454003 [3]西安理工大学电气工程学院,陕西西安710000

出  处:《电力系统保护与控制》2025年第7期133-143,共11页Power System Protection and Control

基  金:国家自然科学基金项目资助(52177114,61703144)。

摘  要:为解决直流电网故障电气量急剧变化对电网造成的不利影响,利用限流电抗器的边界特性,提出了一种基于暂态功率脉冲因子的柔性直流输电线路故障检测。首先,利用故障后各电气量发生急剧变化的特点,提出将Savitzky-Golay滤波与正负极保护测量点的功率变化率结合作为启动判据。其次,建立发生不同故障时柔性直流电网的等效电路图,推导出故障后直流线路上限流电抗器两端暂态功率大小特点,利用脉冲因子提取功率变化量构成区内、外故障判据。最后,计算正负极保护测量点b处功率的脉冲因子之比,构建故障选极判据。仿真结果表明,所提故障检测方法能准确识别故障类型,且在不同工况下未出现误判情况,对柔性直流电网故障检测具有一定的适应性。To address the adverse impacts on the grid caused by sharp changes in electrical quantities during DC grid faults,a transient power pulse factor-based fault detection for flexible DC transmission lines is proposed,using the boundary characteristics of a current limiting reactor.First,based on the characteristic of sharp changes in electrical quantities after a fault,a fault detection criterion is proposed that combines Savitzky-Golay filtering with the power change rate at the positive and negative protection measurement points.Second,an equivalent circuit diagram of the flexible DC grid is established for different fault types,and the transient power magnitude characteristics of the two ends of the upper current limiting reactor on the DC line after a fault are derived.The power change amount is extracted using the impulse factor to constitute fault detection criteria for internal and external faults.Finally,the ratio of the pulse factors of the power at the positive and negative protection measurement points is calculated to construct the fault selection criterion.Simulation results show that the proposed fault detection method can accurately identify the fault types,with no misjudgment in different operating conditions,demonstrating a certain adaptability for fault detection in flexible DC grids.

关 键 词:柔性直流电网 暂态功率 Savitzky-Golay滤波 脉冲因子 故障检测 

分 类 号:TM721.1[电气工程—电力系统及自动化] TM721

 

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