基于改进熵权法的煤矿电能质量评估方法

doi:10.16180/j.cnki.issn1007-7820.2021.07.006

摘要/Abstract

摘要：

针对煤矿电能质量评估中权重分配与评估准确性问题,文中提出了一种基于改进熵权法的煤矿电能质量评估方法。在对煤矿中影响电能质量的因素进行分析的基础上,建立评估指标体系,并对熵权法在熵值都趋近于1时熵权分配不合理问题进行修正。将改进熵权法与AHP标度扩展法相结合对指标权重进行计算,弥补了单一方法的不足,提高了定权的准确性。采用概率统计与模糊数学相融合的方法对指标及权重进行综合评判,实现了对煤矿电能质量的综合评估。实例分析表明该方法有利于区分电能质量等级,并可对电能质量进行定性和定量评价。

关键词: 煤矿企业, 电能质量, 指标, 熵权, 层次分析, 标度, 权重, 综合评估

Abstract:

In view of the problem of weight distribution and evaluation accuracy in coal mine power quality evaluation, a method of coal mine power quality evaluation based on improved entropy weight method is proposed in the current study. The factors affecting the power quality in coal mines are analyzed, and an evaluation index system is established. The improved entropy weight method and AHP scale expansion method are combined to calculate the index weight, which overcomes the shortcomings of the single method and improves the accuracy of the weight determination. Probability statistics and fuzzy mathematics are utilized to comprehensively evaluate indicators and weights, and a comprehensive assessment of the power quality in coal mine is achieved. The example analysis shows that the proposed method is helpful to distinguish the power quality grade, and it can qualitatively and quantitatively evaluate the power quality.

Key words: coal mine enterprise, power quality, index, entropy weight, analytic hierarchy, scale, weight, comprehensive evaluation

中图分类号:

TN-9

王玉梅,刘婧岩,李自强. 基于改进熵权法的煤矿电能质量评估方法[J]. 电子科技, 2021, 34(7): 31-36.

WANG Yumei,LIU Jingyan,LI Ziqiang. Evaluation Method of Coal Mine Power Quality Based on Improved Entropy Weight Method[J]. Electronic Science and Technology, 2021, 34(7): 31-36.

图/表 5

表1

表2

表3

比较标度"

标度	含义(两个因素相比重要程度)
1.0	重要性同等
1.2	一个因素稍稍重要
1.4	一个因素重要
1.6	一个因素比较重要
1.8	一个因素绝对重要
以上标度的倒数	因素i与j比较得到a_ij,因素j与i比较得到 $a ji = 1 /$ a_ij

表3

表4

表5

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序号	熵值	熵权分配
1	(0.999 6,0.999 7,0.999 8,0.999 9)	(0.400 0,0.300 0,0.200 0,0.100 0)
2	(0.996,0.997,0.998,0.999)	(0.400 0,0.300 0,0.200 0,0.100 0)
3	(0.96,0.97,0.98,0.99)	(0.400 0,0.300 0,0.200 0,0.100 0)
4	(0.6,0.7,0.8,0.9 )	(0.400 0,0.300 0,0.200 0,0.100 0)

序号	分布情况	熵值	熵权
1	熵值趋于1	(0.999 6,0.999 7,0.999 8,0.999 9)	(a) (0.400,0.300,0.200,0.100) (b)(0.250 3,0.250 1,0.249 9,0.249 7) (c)(0.250 7,0.250 2,0.249 8,0.249 3) (d)(0.263 0,0.254 3,0.245 7,0.230 7)
2	熵值均匀趋于1	(0.9,0.8,0.7,0.6)	(a) (0.400,0.300,0.200,0.100) (b) (0.116 2,0.199 8,0.300 2,0.383 7) (c) (0.116 8,0.200 2,0.299 8,0.383 2) (d) (0.126 7, 0.203 2,0.295 4,0.374 6)
3	熵值离散分布	(0.96,0.67,0.31,0.10)	(a) (0.020 4,0.168 4,0.352 0,0.459 2) (b) (0.138 6,0.210 4,0.299 0,0.351 5) (c) (0.080 1,0.189 6,0.325 5,0.404 8) (d) (0.020 4,0.168 4,0.352 0,0.459 2)
4	熵值相差较大	(0.999,0.998,0.899,0.100)	(a) (0.001 0,0.002 0,0.100 6,0.896 4) (b)(0.200 0,0.200 2,0.220 0,0.379 9) (c) (0.140 7,0.141 1,0.184 4,0.533 8) (d) (0.001 0,0.002 0,0.100 6,0.896 4)
5	熵值偏小	(0.42,0.30,0.20,0.10)	(a) (0.194 6,0.234 9,0.265 8,0.302 0) (b) (0.195 4,0.235 1,0.268 2,0.301 3) (c) (0.198 2,0.235 9,0.267 3,0.298 6) (d) (0.194 6,0.234 9,0.265 8,0.302 0)

指标	各等级时间/s
	1级	2级	3级	4级	5级
电压暂降	1.868 0	0.659 2	1.210 0	0.000 0	2.404 0
电压偏差	0	70	7 440	850.0	0
电压波动	3 836.2	5 969.2	1 973.2	397.9	0.0
电压闪变	0.0	4 299 0	3 697.5	1 800.2	1 833.6
频率偏差	3 998	3 012	238	0	0
三相不平衡	0	0	0	2 348	4 760
谐波	0	1 562	5 684	0	0

	频率偏差	谐波畸变	电压波动	电压闪变	电压偏差	电压暂降	三相不平衡
熵值	0.982 0	0.985 0	0.968 0	0.982 0	0.991 0	0.992 0	0.997 0
熵权法	0.174 8	0.145 6	0.310 7	0.174 8	0.087 4	0.077 7	0.029 1
改进熵权法	0.156 1	0.144 0	0.212 8	0.156 1	0.119 7	0.115 7	0.095 5