| 引用本文: | 李跃,郑涛,文安.基于单端量的超高压交流输电线路单相接地故障测距方法研究[J].电力系统保护与控制,2020,48(6):27-33.[点击复制] |
| LI Yue,ZHENG Tao,WEN An.A new location method for UHV AC transmission lines with high resistance faults based on single terminal volume[J].Power System Protection and Control,2020,48(6):27-33[点击复制] |
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| 摘要: |
| 基于单端量的高阻接地故障测距精度与过渡电阻和故障点两端故障电流分量相位角有关，通常基于其为金属性故障或故障点两端故障电流相位一致进行求解，这样往往会产生较大的误差。在频域内利用保护安装点电压电流变化量与故障点故障前后电压之间的关系推导回路方程，仅利用保护安装点单端可测的电压变化量准确补偿故障点两侧故障电流分量相位角不一致引起的误差。为充分利用故障信息以及提高测距速度，将包含误差补偿量的方程用R-L模型原理转换到时域内，连续采样积分求解故障距离。PSCAD搭建输电线路模型进行故障仿真。结果表明该算法可解决相位不一致带来的误差，在高阻故障时能准确快速测出故障位置，且灵敏性受分布电容的影响小。 |
| 关键词: 故障定位 相位 R-L模型 时域算法 高阻故障 |
| DOI：10.19783/j.cnki.pspc.190555 |
| 投稿时间：2019-05-17修订日期：2019-06-11 |
| 基金项目:国家重点研发计划资助(2016YFB0900604); 国家自然科学基金项目资助(51637005) |
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| A new location method for UHV AC transmission lines with high resistance faults based on single terminal volume |
| LI Yue,ZHENG Tao,WEN An |
| (State Key Laboratory of Advanced Electromagnetic Engineering and Technology North China Electric Power University, Beijing 102206, China;Automation College, Foshan University of Science and Technology, Foshan 528225, China) |
| Abstract: |
| The accuracy of high resistance fault location based on single terminal is related to the phase angle of the fault current component at both ends of the fault point and the transition resistance. It is usually solved based on the phase consistency of the fault current component at both ends of the fault point or the gold attribute fault, which often results in large errors. In this paper, the loop equation is deduced by using the relationship between the voltage and current variation at the protection installation point and the voltage before and after the fault point in the frequency domain. The error caused by the phase angle difference of the fault current components at both sides of the fault point is compensated accurately only by using the voltage variation measured at the protection installation point. In order to make full use of the fault information and improve the speed of fault location, the error compensation will be included. The principle of R-L model is transformed into time domain, and the fault distance is solved by continuous sampling integral. PSCAD builds the transmission line model for fault simulation. The results show that the algorithm can solve the error caused by phase inconsistency and accurately detect the fault location when the high resistance fault occurs, and the sensitivity is less affected by the distributed capacitance. This work is supported by National Key Research and Development Program of China (No. 2016YFB0900604) and National Natural Science Foundation of China (No. 51637005). |
| Key words: fault locating phase difference R-L model time domain algorithm high resistance faults |
