Theoretical line loss rate evaluation method and system for power distribution network

The invention provides a theoretical line loss rate evaluation method and system for a power distribution network, and relates to the technical field of power distribution networks, and the method comprises the steps: preprocessing obtained power distribution network data to acquire the sum and standard deviation of monthly active electric quantity of a load of a line, representative daily reactive power supply quantity and 24-hour active power principal component extraction quantity; and obtaining a line loss rate prediction value of the line by using the trained neural network model and taking the line operation data and the line parameters obtained after preprocessing as input. The influence of the power supply curve and the load distribution characteristics on the line loss calculationresult is fully considered, the line loss calculation process is abstracted into the multivariate feature extraction process associated with the line loss, the line loss calculation process is simplified, and the calculation