BP网络对负荷值进行预报。在预测日的前一天，每隔两个小时对电力负荷进行一次测量，一天共得到12组测量数据。并将前一天的负荷数据作为网络的样本数据。-System for forecasting of electric load.The day before the forecast day, every two hours of electricity load time measurements a day, a total of 12 groups of measurement data. And the previous day s load data as the sample data of the network.