| 引用本文: | 李振兴,刘 凯,胡 聪,等.基于图像定位的输电线长动态修正及综合行波测距方法[J].电力系统保护与控制,2025,53(02):125-135.[点击复制] |
| LI Zhenxing,LIU Kai,HU Cong,et al.Dynamic correction of transmission line length and an integrated traveling wave ranging method based on image location[J].Power System Protection and Control,2025,53(02):125-135[点击复制] |
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| 基于图像定位的输电线长动态修正及综合行波测距方法 |
| 李振兴1,2,刘凯1,2,胡聪1,2,皮志勇3,翁汉琍1,2,李振华1,2 |
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| (1.新能源微电网湖北省协同创新中心(三峡大学)，湖北 宜昌 443002;2.三峡大学电气与新能源学院，
湖北 宜昌 443002;3.国网湖北省电力公司荆门供电公司，湖北 荆门 448001) |
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| 摘要: |
| 高压输电线路在不同负载下线长动态变化，进而影响基于固定线长的行波测距结果。考虑架空地线不受负荷影响，以地线为参考，应用图像识别定位技术标定地线、输电线相对坐标，并基于架空线路方程的理论推导实现输电线长动态修正。考虑输电杆塔等高、不等高场景，以悬链线方程为基础，转换应力/比载之比为单一变量，对应图像识别定位的地线-输电线高差H构建输电线长修正模型。进一步考虑视觉下的等间隔多点高差分布，应用曲线拟合技术，实现输电线长动态修正。最后将修正线长应用到单端和双端行波测距中，并提出基于最小误差的综合行波测距权重分配，仿真验证了所提线长修正效果及其测距精度。 |
| 关键词: 输电线长修正 行波测距 地线-输电线高差 图像识别 曲线拟合 |
| DOI：10.19783/j.cnki.pspc.240308 |
| 投稿时间：2024-03-18修订日期：2024-06-07 |
| 基金项目:国家自然科学基金项目资助(52077120) |
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| Dynamic correction of transmission line length and an integrated traveling wave ranging method based on image location |
| LI Zhenxing1,2,LIU Kai1,2,HU Cong1,2,PI Zhiyong3,WENG Hanli1,2,LI Zhenhua1,2 |
| (1.Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, China Three Gorges University,
Yichang 443002, China; 2. College of Electrical Engineering and New Energy, China Three Gorges University,
Yichang 443002, China; 3. State Grid Hubei Jingmen Electric Power Supply Company, Jingmen 448001, China) |
| Abstract: |
| The dynamic changes in line length of high-voltage transmission lines under different loads can affect the results of traveling wave distance measurement based on fixed line length. This paper assumes that overhead ground wires are not affected by loads. Using ground wires as a reference, image recognition positioning technology is applied to calibrate the relative coordinates of ground wires and transmission lines. Based on the theoretical derivation of overhead line equations, dynamic correction of transmission line length is achieved. Considering the scenarios of equal and unequal heights of transmission towers, based on the catenary equation, the ratio of stress to specific load is transformed into a single variable, and a transmission line length correction model is constructed corresponding to the ground wire transmission line height difference H identified and located by image recognition. It further considers the visual distribution of equidistant multi-point height differences, applies curve fitting technology, and achieves dynamic correction of transmission line length. Finally, the corrected line length is applied to single end and dual end traveling wave ranging, and a comprehensive traveling wave ranging weight allocation based on minimum error is proposed. The simulation verifies the effectiveness of line length correction and ranging accuracy proposed. |
| Key words: correction of transmission line length traveling wave positioning height difference between ground wire and transmission line image recognition curve fitting |
