Researches On Load Modeling Based On Support Vector Machine

The history and current development of power system load modeling are briefly summarized, including the concepts, models, identification methods. This paper studies static electric load based on Support Vector Machine(SVM) , the dynamic load models based on SVM, and the synthesis of dynamic load characteristic based on SVM. Main contents are as following.1. The static electric load model based on SVMThe static load model expresses the active and reactive powers at any instant of times as functions of voltage and frequency at slow change, and the static load model is often used in power system computing, analysis and control. With the development of power system, the wide application of all kinds of power electric equipments and new non-linear load, as a result power load appear considerable changes. With new technology promoting power system development and improvement, the new problems occurred in power system. As the traditional static load model already had great difficulty in describing the static characteristic of modern load, it requires that a new model will be introduced to descript load characteristic better. To facilitate the work in load static characteristic analysis and description, a new idea of static electric load characteristic based on SVM is introduced in this paper. Based on the analysis of the structure for traditional model, the reason of a higher error is pointed in this paper. According to the theory of SVM, this paper presents methods and arithmetic of interpolation of solving the equation or fitting method of optimization based on application occasion and data features.Test results on typical load reveal that the load model can describe the static characteristic of complex load, this research provide a new effective method to identify load characteristic of unknown structure.2. The dynamic load models based on SVMThe kinds of the dynamic load models are introduced in this paper,which include the induction motor models,dynamic neural network model and several kinds of liner dynamic load models of the continuous dynamic system. The thesis presents a new modeling methods which is based on Support Vector Machine. The parameters of the dynamic load model based on SVM are obtained by using the results of the dynamic modeling experiments.3. The synthesis of dynamic load characteristics based on SVMA kind of single load model can not well meet the systematic need under various kinds of complicated situations, the practical load model should possess the ability of the many kinds of load model, the existing comprehensive model emphasizes the whole materials describe , can only be to the whole description of all materials of the record of a kind of model, and lack the description of many kind load models, so the existing comprehensive model can not describe the load characteristic of the power system accurately in emulation is calculated . This thesis presents the synthesis of dynamic load characteristics model based on SVM , this model can describe the behavior of load well within the larger range of voltage perturbation , and it has a good generalization as well as approximation ability.