近年来，随着煤矿智能化、自动化及节能化建设工作的推进，各类大功率、冲击性负载数量逐增，大量非线性的电力电子装置部署于煤矿电网，导致煤矿电网的电能质量问题日益严重。因此深入研究煤矿电网电能质量评价方法，对保障煤矿电网的安全运行以及煤矿安全生产有重要意义。
本文以煤矿电网电能质量评价方法为研究对象，在总结分析电能质量评价方法国内外研究现状的基础上，对煤矿电网电能质量的影响因素进行探究，筛选出8项可合理描述煤矿电网运行特性的电能质量指标。采用电能质量指标权重特性与评价模型特性相融合的评价方法，首先构造惩罚型状态变权对电能质量指标权重进行动态修正，克服组合赋权“一值复用”及优势指标补偿机制引发的评价不准确问题。其次，结合煤矿电网电能质量评价等级划分特点，提出一种基于最小二乘法的熵值参数优化算法改进可拓云评价模型，改善评价等级边界数值归属问题；为降低云滴弥散对电能质量指标等级标准云交界范围的影响，利用对比云图确定适用于煤矿电网电能质量指标评价等级的超熵参数。然后，采用改进的D-S证据理论融合变权权重与指标云关联度，通过判断条件得到最终的电能质量评价结果。最后，通过仿真对构建的煤矿电网电能质量评价模型的可靠性进行了验证。本文以煤矿电能质量在线监测系统为基础，开发了煤矿电网电能质量评价系统，通过主机、数据库和煤矿电网电能质量评价模型的交互，实现了煤矿电网电能质量的评价。
本文通过对煤矿电网电能质量评价方法的研究，构建了一种适用于煤矿电网的电能质量评价模型，可以合理评价煤矿电网各电能质量监测点的电能质量等级，所设计的煤矿电网电能质量评价系统能够对煤矿电网电能质量在线监测系统进行完善和补充，为后续电能质量治理工作提供了依据，具有一定的理论研究和工程应用价值。
 

In recent years, with the advancement of intelligent, automatic and energy-saving construction of coal mine, the number of various high-power and impact loads is increasing, and a large number of nonlinear power electronic devices are deployed in coal mine power grid, resulting in the increasingly serious power quality problem of coal mine power grid. Therefore, in-depth study of power quality evaluation methods of coal mine power grid is of great significance to ensure the safe operation of coal mine power grid and coal mine safety production.
Based on the summary and analysis of the research status of power quality evaluation methods at home and abroad, this paper explores the influencing factors of power quality of coal mine power grid, and selects 8 power quality indexes that can reasonably describe the operation characteristics of coal mine power grid. Using the evaluation method combining the weight characteristics of power quality index and the characteristics of evaluation model, firstly, the penalty state variable weight is constructed to dynamically modify the weight of power quality index, so as to overcome the inaccurate evaluation caused by the single value reuse of combined weight and the compensation mechanism of advantage index. Secondly, combined with the classification characteristics of power quality evaluation of coal mine power grid, an entropy parameter optimization algorithm based on least square method is proposed to improve the extension cloud evaluation model and the numerical attribution of evaluation level boundary; In order to reduce the influence of cloud droplet dispersion on the cloud boundary range of power quality index grade standard, the super entropy parameter suitable for the evaluation grade of power quality index of coal mine power grid is determined by using the comparative cloud map. Then, the improved D-S evidence theory is used to fuse the variable weight and index cloud correlation degree, and the final power quality evaluation result is obtained by judging the conditions. Finally, the reliability of the power quality evaluation model of coal mine power grid is verified by simulation. Based on the on-line monitoring system of coal mine power quality, this paper develops the power quality evaluation system of coal mine power grid. Through the interaction of host, database and power quality evaluation model of coal mine power grid, the evaluation of power quality of coal mine power grid is realized.
Through the research on the power quality evaluation method of coal mine power grid, this paper constructs a power quality evaluation model suitable for coal mine power grid, which can reasonably evaluate the power quality grade of each power quality monitoring point of coal mine power grid. The designed power quality evaluation system of coal mine power grid can improve and supplement the on-line power quality monitoring system of coal mine power grid, which provides a basis for the follow-up power quality management, it has certain theoretical research and engineering application value.
~In recent years, with the advancement of intelligent, automatic and energy-saving construction of coal mine, the number of various high-power and impact loads is increasing, and a large number of nonlinear power electronic devices are deployed in coal mine power grid, resulting in the increasingly serious power quality problem of coal mine power grid. Therefore, in-depth study of power quality evaluation methods of coal mine power grid is of great significance to ensure the safe operation of coal mine power grid and coal mine safety production.
Based on the summary and analysis of the research status of power quality evaluation methods at home and abroad, this paper explores the influencing factors of power quality of coal mine power grid, and selects 8 power quality indexes that can reasonably describe the operation characteristics of coal mine power grid. Using the evaluation method combining the weight characteristics of power quality index and the characteristics of evaluation model, firstly, the penalty state variable weight is constructed to dynamically modify the weight of power quality index, so as to overcome the inaccurate evaluation caused by the single value reuse of combined weight and the compensation mechanism of advantage index. Secondly, combined with the classification characteristics of power quality evaluation of coal mine power grid, an entropy parameter optimization algorithm based on least square method is proposed to improve the extension cloud evaluation model and the numerical attribution of evaluation level boundary; In order to reduce the influence of cloud droplet dispersion on the cloud boundary range of power quality index grade standard, the super entropy parameter suitable for the evaluation grade of power quality index of coal mine power grid is determined by using the comparative cloud map. Then, the improved D-S evidence theory is used to fuse the variable weight and index cloud correlation degree, and the final power quality evaluation result is obtained by judging the conditions. Finally, the reliability of the power quality evaluation model of coal mine power grid is verified by simulation. Based on the on-line monitoring system of coal mine power quality, this paper develops the power quality evaluation system of coal mine power grid. Through the interaction of host, database and power quality evaluation model of coal mine power grid, the evaluation of power quality of coal mine power grid is realized.
Through the research on the power quality evaluation method of coal mine power grid, this paper constructs a power quality evaluation model suitable for coal mine power grid, which can reasonably evaluate the power quality grade of each power quality monitoring point of coal mine power grid. The designed power quality evaluation system of coal mine power grid can improve and supplement the on-line power quality monitoring system of coal mine power grid, which provides a basis for the follow-up power quality management, it has certain theoretical research and engineering application value.
 

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