Study On Parameter Identification Method Of Steam Turbine And Its Governing System Based On Improved Differential Evolution Algorithm

The analysis of power system is very important to ensure the safe and stable operation of the system.For the stability analysis of the medium and long term power system,the accuracy of the model and parameters of the steam turbine and its governing system is very critical.Therefore,it has important theoretical research value and engineering application prospect to study the high precision identification method suitable for the model of steam turbine and its governing system.This thesis are listed as follows:First of all,this paper introduces the working principle and mathematical model of the steam turbine and its governing system.Through the analysis of its structure and principle,analysis of typical steam turbine electro-hydraulic control system model in power system stability with improved more in line with the actual situation including delay actuator model,and the parameters of the model in the qualitative analysis,to determine the link parameters.Secondly,there are still some problems to solve practical identification work,this paper introduces the test process parameters of steam turbine and its governing system according to the relevant test standards,and the measured data were preprocessed;in order to improve the identification accuracy of steam turbine and governor system model parameters,this paper puts forward a method of parameter identification of actuator improved differential evolution algorithm based on the model;and through the establishment of steam turbine generator includes a low order link,proposes a parameter identification method based on the power response,can achieve the accurate identification of the high pressure cylinder of steam turbine power overshoot coefficient and the basic parameters of the steam turbine;at the same time using the idea of parameter trajectory sensitivity,proposes a parameter identification method for classification of steam turbine the parameter sensitivity based on the solution to the overall problem of the steam turbine model parameter identification.In order to effectively improve the identification efficiency and reduce the burden of designers,a software for parameter identification of steam turbine and its speed governing model is developed based on MATLAB GUI platform.Finally,the application of parameter identification for the identification method proposed in this paper is applied.In Shiliquan Power Plant unit the parameter identification model of steam turbine and its governing system,in a single machine infinite bus system in BPA to load the valve position and step frequency disturbance test simulation.The simulation results show that the errors between simulation results and measured data meet the requirements of relevant standards in the process of verification.The proposed method can improve the identification accuracy of model parameters of steam turbine and its governing system,and can provide accurate models and parameters for power system stability analysis.