说明：  采用MATLAB神经网络工具箱编程，构建了一个三层的BP神经网络，建立了短期负荷预测的模型，并通过具体实例，进行负荷预测。
(Programming using MATLAB neural network toolbox to build a three-layer BP neural network, the establishment of a short-term load forecasting model, and through concrete examples, perform load forecasting.)