矿井低压电网漏电保护算法及其装置的研究

发布时间：2018-05-03 09:14

本文选题：矿井低压电网 + 漏电故障　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：由于矿井环境的特殊性使得故障信号微弱、特征不明显、干扰较大,当前漏电故障选线方法趋于成熟,但定位方法在实际应用中的准确性和可靠性仍然存在诸多不足,漏判、误判的现象屡见不鲜,为保证对矿井供电系统安全可靠地供电,迅速而又准确地确定故障点位置格外重要。本文以改善矿井安全为出发点,对长距离矿井低压电网进行了单相漏电故障特征分析,以零序电流逻辑关系和零序电流互感器性能为基础,构造全新三互感器紧凑型电网结构,以人为中性点经阻抗线圈接地的方式补偿故障电流以减轻危害,分别运用相对熵、差动特征量等理论和概念对漏电故障选线定位加以分析,提出基于差动特征量概念的差动式漏电故障选线算法和基于小波包能量谱相对熵的漏电故障定位算法,并根据各自的算法流程搭建Matlab模型仿真分析,仿真结果表明：本文研究的两种算法各有特色,但都能对漏电故障实现准确的定位；在实验室环境下搭建基于差动特征量算法的模拟系统进行漏电保护装置的设计与开发；实验结果表明：基于差动特征量的算法及其漏电保护装置能正确选线,与仿真结果一致。
[Abstract]:Because of the particularity of mine environment, the fault signal is weak, the characteristic is not obvious, and the interference is large. The current fault line selection method of leakage current tends to be mature, but the accuracy and reliability of the location method in the practical application still exist many shortcomings. In order to ensure the safe and reliable power supply to mine power supply system, it is very important to determine the location of fault point quickly and accurately. In order to improve mine safety, this paper analyzes the fault characteristics of single phase leakage in long distance mine low voltage network. Based on the logic relation of zero sequence current and the performance of zero sequence current transformer, a new three transformer compact network structure is constructed. The fault current is compensated by artificial neutral point through impedance coil to reduce the harm. The relative entropy and differential characteristic quantity are used to analyze the location of leakage fault line. A differential fault line detection algorithm based on the concept of differential eigenvalue and an algorithm for locating leakage fault based on relative entropy of wavelet packet energy spectrum are proposed, and the simulation analysis of Matlab model is built according to the respective algorithm flow. The simulation results show that the two algorithms studied in this paper have their own characteristics, but both of them can accurately locate the leakage fault, and the simulation system based on the differential characteristic quantity algorithm is built in the laboratory to design and develop the leakage protection device. The experimental results show that the algorithm based on differential eigenvalue and its leakage protection device can select the line correctly, which is consistent with the simulation results.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD611.5;TM564.8

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