The invention discloses a k-VNN- and LS-SVM-based modelling method for the
icing of an electric
transmission line. The k-VNN- and LS-SVM-based modelling method comprises the following steps of: taking the historical data provided by the micro-
weather station of an
overhead line structure as basis, reading in micro-
weather parameter values and converting the micro-
weather parameter values to a vector form; introducing a k-VNN
algorithm so as to select proper samples from a line
icing sample
database, and calculating the Euclidean distances and included angle information of information vectors; selectively deleting and reserving the similar areas, that is, adjacent points, of the information vectors to form a training sample; optimizing the quantity of the samples selected by the k-VNN adjacent
algorithm, by a cross-validation method, so as to acquire proper parameters such as the width
delta of a kernel function K(xi, xj) and an error
penalty factor gamma in an LS-SVM model, and finding the optimal one; after the parameters are set, training related data by a
least squares support vector machine (LS-SVM), and finally acquiring an
icing thickness. The
algorithm disclosed by the invention is high in prediction accuracy, extremely fast in speed, and suitable for short-term icing prediction for the icing of the electric
transmission line.