| 引用本文: | 孙沛瑶,林圣,刘磊,何正友.融合行波时频信息的HVDC线路雷击点与短路故障点不一致时的定位方法[J].电力系统保护与控制,2019,47(5):88-95.[点击复制] |
| SUN Peiyao,LIN Sheng,LIU Lei,HE Zhengyou.Location method for HVDC transmission line under lightning stoke fault with short-circuit fault position different from lighting position based on time-domain and frequency-domain information of traveling waves[J].Power System Protection and Control,2019,47(5):88-95[点击复制] |
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| 摘要: |
| 雷电流在输电线路传播时，可能导致线路的绝缘薄弱环节被击穿，发生短路故障，此时现有时域行波测距算法只能获取雷击点位置而无法获取精确的故障距离。因此，针对高压直流输电线路雷击点与短路故障点不一致的情况，提出一种综合利用输电线路两端电流行波的时域信息和频域信息的故障定位方法。该方法首先根据线路两端故障电流行波的时域信息判断雷击点位置，然后利用雷击点与短路故障点存在的位置关系判断输电线路短路故障点位置区段，最后根据线路双端或单端的故障电流行波固有频率计算短路故障点距离。PSCAD/EMTDC仿真结果表明，该方法在高压直流输电线路雷击点与短路故障点不一致情况下对短路故障点定位精度高，且不受雷击点与短路故障点位置、过渡电阻及噪声干扰的影响，具有良好的适用性和实用价值。 |
| 关键词: 高压直流输电 雷击点定位 故障点定位 行波时域波头 行波固有频率 |
| DOI：10.7667/PSPC180230 |
| 投稿时间：2018-03-06修订日期：2018-05-22 |
| 基金项目:国家重点研发计划智能电网技术与装备重点专项资助(2016YFB0900600);国家电网公司科技项目资助(52094017000W);四川省科技计划项目资助(2018GZ0392) |
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| Location method for HVDC transmission line under lightning stoke fault with short-circuit fault position different from lighting position based on time-domain and frequency-domain information of traveling waves |
| SUN Peiyao,LIN Sheng,LIU Lei,HE Zhengyou |
| (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China) |
| Abstract: |
| When lightning current transmits along transmission line, the weak points of insulation may be broken down which will result in short circuit faults of line. At this time, for the current fault location method, the location of the lightning location can be obtained by time-domain characteristics of traveling wave, however the precise fault point is failed to be got. Therefore, considering the condition that the positions of lightning and fault are different for HVDC transmission line, a fault location method based on time-domain and frequency-domain information of traveling waves is put forward in this paper. Firstly, the lightning position is located using time-domain information of two-terminal traveling wave. And then the line section where fault occurs is judged according to the relation between the lightning stroke point and the fault point. Finally, the fault distance can be calculated based on the single-terminal/ two-terminal values of the nature frequencies component reflecting the certain transmission path of fault-traveling wave. Simulation results based on PSCAD/EMTDC indicate that the fault distance can be estimated accurately based on the presented location method under the situation that the positions of lightning and fault are different for HVDC transmission line, and the locating performance is not affected by lightning stroke positions and fault positions, fault resistances and noise, provided with great applicability and practical value. This work is supported by Smart Grid Technology and Equipment of National Key Research and Development Plan of China (No. 2016YFB0900600), Science and Technology Project of State Grid Corporation of China (No. 52094017000W) and Technology Planning Project of Sichuan Province of China (No. 2018GZ0392). |
| Key words: HVDC strike point location fault location travelling wave time domain natural frequencies |
