VMD-KELM Short-term Load Forecasting Based on Improved Hunter-prey Optimizer

doi:10.11985/2023.04.025

Abstract

Abstract:

In order to further improve the accuracy and reliability of load forecasting, a forecasting model based on variational mode decomposition(VMD) and Levy-hunter-prey optimizer(LHPO) improved by population chaos strategy and Levy flight strategy is proposed to optimize kernel extreme learning machine(KELM), in view of the shortcomings of the KELM parameter selection that affects the forecasting ability and the characteristics of the volatility and non-stationary of load data. Firstly, the environmental factors and load data of the original data are analyzed by using the grey relational analysis. Then, VMD is used to decompose the load data, and each decomposition subsequence is input into the KELM model optimized by LHPO for short-term load forecasting. Finally, each prediction result is stacked. Simulation experiment results show that the prediction model has high adaptability to short-term load forecasting.

Key words: Short-term load forecasting, VMD, kernel extreme learning machine, hunter-prey optimizer, Levy flight, grey incidence model

CLC Number:

TM74

LU Yingda, ZHANG Jing. VMD-KELM Short-term Load Forecasting Based on Improved Hunter-prey Optimizer[J]. Journal of Electrical Engineering, 2023, 18(4): 228-238.

Figures/Tables 21

函数表达式	取值范围	最优解
$f 1 = ∑ i = 1 n \| x i \| + ∏ i = 1 n x i$	[-10, 10]	0
$f 2 = ∑ i = 1 n [100 (x i + 1 − x i 2) 2 + (x i − 1) 2]$	[-30, 30]	0
$f 3 = 1 4 000 ∑ i = 1 n x i 2 − ∏ i = 1 n cos (x i i) + 1$	[-600, 600]	0

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基准函数	HPO		LHPO
基准函数	均值	标准差	均值	标准差
f₁	2.497×10^-56	3.862×10^-56	0	0
f₂	3.065×10^-5	3.746×10^-5	3.339×10^-7	7.284×10^-7
f₃	0	0	0	0

特征参数	参数类型	详细描述
经济因素	电价	使用1度电的价格
环境因素	湿度露点温度干球温度湿球温度	表示空气中大气干燥程度水蒸气与水达到平衡状态的温度被测量空气的真实热力学温度热力学绝热饱和温度
电力负荷	瓦	发电机组单位时间发电量

模型	RMSE/kW	MAPE(%)	MAE/kW
KELM	393.52	3.75	326.94
GRA-KELM	312.71	3.17	251.65

模态K	K=1	K=2	K=3	K=4	K=5
模态1	0.020	0.020	0.021	0.022	0.021
模态2	—	0.125	0.125	0.128	0.119
模态3	—	—	10.067	11.348	10.660
模态4	—	—	—	17.813	16.680
模态5	—	—	—	—	19.880

模型	RMSE/kW	MAPE(%)	MAE/kW
LSTM	324.54	2.915	252.64
SVR	383.38	3.364	306.05
VMD-SSA-KELM	196.87	2.123	180.60
VMD-WOA-KELM	152.87	1.553	133.65
LHPO-KELM	232.90	2.610	220.25
VMD-HPO-KELM	135.07	1.320	114.29
VMD-LHPO-KELM	77.61	0.665	59.06