系统仿真学报 ›› 2021, Vol. 33 ›› Issue (11): 2627-2635.doi: 10.16182/j.issn1004731x.joss.21-FZ0709

• 仿真建模理论与方法 • 上一篇    下一篇

基于经验小波变换的光伏功率组合预测模型

陈涛, 王艳, 纪志成   

  1. 江南大学 物联网技术应用教育部工程研究中心,江苏 无锡 214122
  • 收稿日期:2021-04-20 修回日期:2021-07-30 出版日期:2021-11-18 发布日期:2021-11-17
  • 通讯作者: 王艳(1978-),女,博士,教授,研究方向为制造系统能效优化。E-mail:15850696098@163.com
  • 作者简介:陈涛(1994-),男,硕士生,研究方向为智能算法与预测控制。E-mail:15850696098@163.com
  • 基金资助:
    国家重点研发计划(2018YFB170903); 国家自然科学基金(61973138)

Combination Forecasting Model of Photovoltaic Power Based on Empirical Wavelet Transform

Chen Tao, Wang Yan, Ji Zhicheng   

  1. Engineering Research Center for Internet of Things Technology Application Ministry of Education, Jiangnan University, Wuxi 214122, China
  • Received:2021-04-20 Revised:2021-07-30 Online:2021-11-18 Published:2021-11-17

摘要: 为提高短期光伏功率的预测精度,提出一种基于经验小波变换(Empirical Wavelet Transform,EWT)和粒子群算法(Particle Swarm Optimization,PSO)优化随机森林(Random Forest,RF)的变权组合预测模型。利用灰色关联分析选出相似日,使用EWT将功率时间序列分解成不同频率的子模态,根据频率将其重构为高、中、低频3个模态,建立PSO-RF,PSO-BP,PSO-LSSVM预测模型动态计算各自权值进行重构,进行误差校正输出预测结果。通过对澳大利亚光伏电站输出功率进行预测,结果验证了EWT-PSO-RF组合模型的有效性。

关键词: 光伏功率预测, 经验小波变换, 随机森林, 灰色关联度, 误差校正

Abstract: In order to improve the prediction accuracy of short-term photovoltaic power, a variable weight combined prediction model based on Empirical Wavelet Transform (EWT) and PSO-optimized random forest(RF) is proposed. Gray correlation analysis is used to select similar days, EWT is used to decompose the power time series into sub-modes of different frequencies, and three modes of high, medium, and low frequency are reconstructed according to the frequency, PSO-RF and PSO-BP and PSO-LSSVM prediction models are established to dynamically calculate their respective weights for reconstruction, and error correction is performed to output the prediction results. By predicting the output power of Australian photovoltaic power stations, the results verify the effectiveness of the EWT-PSO-RF combined model, which effectively improves the accuracy of ultra-short-term photovoltaic power prediction.

Key words: PV power prediction, empirical wavelet transform, random forest, grey correlation degree, model parameter optimization

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