基于AT(自耦变压器)吸上电流比的牵引网多分段线性化故障测距方法研究
侯峰1王帅2孙忠锐2
Research on MultiSegment Linearization Ranging Measurement Method Based on AT Suction Current Ratio in Traction Power Supply System
HOU FengWANG ShuaiSUN Zhongrui
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作者信息:1.广州地铁设计研究院股份有限公司， 510010， 广州
2.西南交通大学电气工程学院， 611756，成都
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Affiliation:Guangzhou Metro Design & Research Institute Co., Ltd., 510010, Guangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.12.032
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中图分类号/CLCN:U223.8
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栏目/Col:研究报告
摘要:
目的：针对现有AT(自耦变压器)吸上电流比故障测距方法修正系数通过短路试验获取困难，提出新型修正系数获取方案，以有效提升故障定位精度，加快故障牵引网维修速度，减少供电系统停电时间。方法：通过接触网检测车以及定位设备，获得首末端AT吸上电流比与接触网检测车位置，基于接触网检测车的位置分布，求解AT吸上电流比分段修正系数。进一步提出AT吸上电流比故障测距的多分段线性化方法，通过细分故障测距分段整定范围，提升故障定位精度。依据AT牵引网工程参数，在MATLAB/Simulink软件上搭建双边供电50 km AT牵引网仿真模型，分别计算基于短路试验的传统AT吸上电流比故障测距方法和基于检测车位置的AT吸上电流比多分段线性化测距方法的测距误差与修正精度，并进行对比分析。结果及结论：仿真试验结果验证了基于AT吸上电流比的多分段线性化故障测距方法的正确性与精确性，故障定位误差由传统方法±300 m范围缩小至±100 m，有效提升了故障定位精度。该方法无需短路试验，减少了传统短路试验测定修正系数方法对牵引网导线与断路器带来的寿命损耗，可应用于牵引网故障分析与故障定位研究。
Abstracts:
Objective: In response to the difficulty of obtaining the correction coefficients for existing AT (autotransformer) suction current ratio ranging method through shortcircuit tests, a new correction coefficient acquisition scheme is proposed to effectively enhance the accuracy of fault location and expedite repair of the fault traction network, resulting in reduction of power supply system outage time. Method: Utilizing a catenary detection vehicle and locating equipment, the AT suction current ratio at the beginning and end, along with the position of catenary detection vehicle is obtained. Based on the position distribution of catenary detection vehicles, the segmented correction coefficients for AT suction current ratio are determined. Furthermore, a multisegment linearization method for ranging based on the AT suction current ratio is proposed. This method subdivides the ranging range to enhance the fault location accuracy. Using the parameters of AT traction power supply system, a 50 km AT traction network simulation model is constructed in MATLAB/Simulink software. The ranging errors and correction accuracy of the conventional AT suction current ratio ranging method based on shortcircuit tests and the AT suction current ratio multisegment linearization ranging method based on the position of the inspection vehicle are calculated and compared. Result & Conclusion: The simulation test results validate the correctness and precision of the multisegment linearization ranging method based on the AT suction current ratio. The ranging error is reduced from ±300 m in the conventional method to ±100 m, effectively improving fault location accuracy. This method eliminates the need for shortcircuit tests, reducing the lifespan loss on traction network conductors and circuit breakers caused by conventional methods. It is applicable for fault analysis and fault location research in traction network.
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