Simplified Strategy Of Synthesis Load Model Parameters Identification Based On Global Sensitivity Analysis

Load modeling plays a vital role in power system research.The parameter settings in the load model directly affect the accura cy of the load model.As the research progresses,the complexity of the load model continues to increase,and the parameters increase.Aiming at these stable problems in the current load modeling work,this paper comprehensively uses system identification theory,advanced mathematics and computer technology and other related theories and technologies to surround the structure of the synthesis load model,the sensitivity of parameters to voltage,the sensitivity of parameters to output power and A series of studies and analysis have been carried out on the simplification of model parameters.The specific research contents are as follows:Firstly,the significance,history and research status of load modeling research and the main challenges facing it and the development of future are described.The load was classified The types of load models,their structure,the application of load models both inside and outside the country,and load modeling methods are introduced in detail.Secondly,in order to solve the problem that the current synthesis load model has many parameters and low identification efficiency,based on the traditional sensitivity analysis,a simplified strategy for synthesis load model identification based on global sensitivity analysis is proposed.The Sobol first-order indices(FSI)and total sobol indices(TSI)were analyzed,and the influence of input parameters on the model output was determined according to the size of FSI and TSI.The input parameters of the model were simplified based on the results of FSI and TSI,and passed Simulation analysis of measured data validates the effectiveness of the identification strategy.Finally,based on the current power system simulation requirements for the accuracy of the synthesis load model,and most of the current loads are composed of induction motor loads.This paper builds an IEEE-39 node model.In this system,the perturbation parameter method is used to change the size of the parameters of the induction motor model and the proportion of the indu ction within a reasonable range while other parameter stay constant.The parameters are verified by the method of simulation observation.The effect of the proportion on the system voltage.According to the analysis results,it is known that the simplified strategy of load model identification based on global sensitivity analysis,compared with the traditional method,simplifies the calculation process,and is more accurate than the traditional derivative method in the accuracy of the analysis results.In a ddition,it provides a new understanding of the impact of load model parameters on model output,the impact of induction motor parameters on load bus voltage,further deepening the understanding of the effects of induction motor parameters on load bus volt age,and has a certain effect on maintaining stable power grid operation Practical significance.