基于二次分解的不同太阳辐射下光伏功率预测

PREDICTION OF PHOTOVOLTAIC POWER UNDER DIFFERENT SOLAR RADIATION BASED ON SECONDARY DECOMPOSITION

考虑不同太阳辐射对光伏功率的影响,提出一种基于二次分解和改进粒子群算法的光伏功率预测模型。通过Spearman和Kendall对影响光伏功率的各气象因素进行相关性分析,发现总倾斜辐射、总水平辐射、漫射倾斜辐射、漫射水平辐射与光伏功率的相关系数较大。然后利用CLARANS将样本数据按太阳辐射强度分为强辐射、中辐射和弱辐射,针对3类数据采用自适应噪声完备集合经验模态分解(CEEMDAN)对关键气象因素和功率进行二次分解,充分挖掘时序信息并降低数据的不稳定性。提出一种改进粒子群算法(GWCPSO)用于优化卷积神经网络和双向长短期记忆网络的超参数,提高调参效率,最后构建预测模型进行光伏功率预测。分析3种太阳辐射类型下不同分解方法与网络模型的预测误差,结果表明,所的预测模型可有效提高不同太阳辐射下光伏功率的预测精度。

A photovoltaic power prediction model based on quadratic decomposition and improved particle swarm optimization algorithm is proposed considering the impact of different solar radiation on photovoltaic power.Through Spearman and Kendall's correlation analysis of various meteorological factors affecting photovoltaic power,it was found that the correlation coefficients between total tilt radiation,total horizontal radiation,diffuse tilt radiation,diffuse horizontal radiation,and photovoltaic power are relatively large.Then we use CLARANS to divide the sample data into strong radiation,medium radiation and weak radiation according to the solar radiant intensity.For the three types of data,we use CEEMDAN to decompose the key meteorological factors and power twice,fully mining time series information and reducing data instability.The GWCPSO is proposed to optimize the hyperparameter of the convolutional neural network and the bidirectional long short-term memory network,improve the efficiency of parameter adjustment,and finally build a prediction model for photovoltaic power prediction.Analyzing the prediction errors of different decomposition methods and network models under three types of solar radiation,the results show that the proposed prediction model can effectively improve the prediction accuracy of photovoltaic power under different solar radiation conditions.