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

Abstract

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

CLC Number:

TN-9

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.

Figures/Tables 5

Table 1.

Table 2.

Table 3.

Comparison scale"

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

Table 3.

Table 4.

Table 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

Evaluation Method of Coal Mine Power Quality Based on Improved Entropy Weight Method

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