The establishment of ANN model:In the BP neural
network model, the load time serial number, temperature and
PM2.5 as neural network input, each time point load as neural
network's output, so we construct a 3-X-1 type of three layers
BP neural network. For a BP neural network, but also to
determine the suitable number of hidden layer nodes, through
iterative calculation optimization, the hidden layer node
number is set to 5, so as to build the BP neural network is the
neural network 3-5-1 type, network topology structure as
shown in Figure 1.1.