基于加权扩展日特征矩阵的分布式光伏发电日前功率预测

分布式户用光伏发电系统的精确日前功率预测可为智能家庭优化运行提供依据,但历史数据量少和缺乏精确辐照预报数据的问题增大了预测难度.为此,将邻近多用户数据融合以扩充样本规模,提出一种考虑功率关联性和相关度权重的相似日搜索方法,并基于长短期记忆(LSTM)神经网络实现日前预测.分析光伏发电功率的影响因素及其内在相关性,基于天...

Day-ahead power forecasting of distributed photovoltaic generation based on weighted expanded daily feature matrix

Accurate day-ahead power forecasting of distributed household photovoltaic generation system can provide a basis for optimal operation of smart houses, but the problems of lack of historical data and precise irradiance forecasting data increase forecasting difficulty. Therefore, the sample scale is enlarged by integrating data from multiple users in the nearby area, a similar day selection method considering power correlation and relevant weight is proposed, and the day-ahead forecasting is realized based on LSTM(Long Short-Term Memory) neural network. The influencing factors of photovoltaic generation power and their internal correlation are analyzed, the day types are classified based on the statistical data of weather type, and the meteorological information, historical power information and Pearson product-moment correlation coefficient are used to construct the weighted expanded daily feature matrix. The photovoltaic power of similar day with minimum Euclidean distance of feature matrix of the day to be forecasted is selected from historical data, and it is input LSTM neural network model together with key meteorological features for forecasting. The validity of the proposed method is verified by the measured data of multiple users in Denver City of North America, the proposed method can be applied in the scene with limited historical data and can significantly reduce the forecasting error in multiple weather types.