Power System Static Load Characteristic Modeling And Parameter Identification With Variable Forgetting Factor

As an important part of the modern power system,power load plays a key role in the overall design and analysis of the system and dispatching operation control.All kinds of accurate decisions made by the power sector are based on digital simulation calculations based on mathematical models of various electrical components,so the accuracy of the models will directly affect the simulation calculation results of the power system and the decisions made based on them.Therefore,research on topics related to power load characteristic modeling and model parameter identification has attracted extensive attention from experts and scholars in the power industry at home and abroad.This article discusses the power system comprehensive load modeling theory and model characteristic parameter identification method,briefly analyzes the role of load characteristic modeling in power system analysis,systematically explains its development process and research status,and outlines the structure and classification of power load models,modeling concepts and methods,and identification methods of load characteristic parameters.Combining the actual project topics of a scientific research department of State Grid Corporation,starting from the traditional statistical synthesis method load modeling principle,a set of systematic theory on the comprehensive load static modeling method and model characteristic parameter identification algorithm is proposed.The determination of the average characteristics of the equipment,the classification of the industry and the selection of typical users,and the analysis of the industry load composition based on the typical daily load characteristic curve are used to develop the comprehensive static characteristic modeling of the actual distribution network.According to the data measurement of the actual power system and the simulation test of the electrical laboratory,the IEEE calculation recommended value of the average electrical characteristics of the typical load equipment is obtained;then the load data of the typical industry users provided by the power department is used to determine the applicable characteristic parameters of the comprehensive load static model of each industry by season.The power load is time-varying.By studying the characteristics of typical daily loads in different seasons,and analyzing the types and proportions of the load composition of different industries according to the typical daily load curves of substations,a comprehensive load characteristic model of the actual distribution network powered by the substation is finally established.;In order to prove the correctness of the above-mentioned load model and the effectiveness of its characteristic parameters,a load parameter identification method based on the variable forgetting factor RLS estimation algorithm is proposed,and the modeling practice and calculation example analysis are carried out based on the measured load data.It is verified that the established comprehensive load characteristic model and variable forgetting factor RLS parameter identification algorithm are feasible and reliable.