Research On Frequency Response Model Of Regional Power Network And Identification Of Equivalent Speed Governing System

With the development of large energy base and UHV AC and DC projects,power transmission by single channel accounts for a higher proportion in the power grid,which increases the probability of large frequency difference disturbance to the power grid.And the frequency stability of the power grid is becoming increasingly prominent.In power system,the parameters of generator prime mover and speed regulating system are greatly affected by working conditions.How to determine the frequency regulation characteristics of power system under large frequency difference disturbance is of great significance.Based on the summary and analysis of previous research results,this paper studies the frequency response model of regional power grid.Based on the analysis and simulation,a method of identifying the equivalent speed regulation system of regional power grid is proposed to analyze the frequency regulation characteristics of regional power grid under large frequency difference disturbance.This paper specifically completed the following research:(1)The structure and principle of frequency response model of regional power grid are studied.And the working principle and mathematical model of internal components are given in detail.On the basis of summarizing and analyzing the model,the main factors affecting the frequency regulation characteristics of power system are expounded,and the idea of modeling and identifying the regional power grid equivalent speed regulation system for analyzing the frequency regulation characteristics of power system under large frequency difference disturbance is put forward.(2)Focusing on the modeling and identification of regional power grid equivalent speed regulation system,the characteristics and technical requirements of this problem are analyzed.The Fibonacci tree optimization algorithm with the characteristics of global and local alternating optimization is deeply studied.It is considered that the algorithm has a high convergence speed on the basis of ensuring certain reliability,and is suitable for the overall identification of parameters of regional power grid speed control system.The Fibonacci tree optimization algorithm is adjusted to improve the global search ability and convergence speed at the cost of multi-peak search ability,and a Fibonacci tree identification algorithm is formed.The feasibility of the proposed method is verified by simulation analysis,and the advantages of Fibonacci tree identification algorithm in this problem are illustrated by comparing several algorithms.(3)Based on the acquisition process of frequency regulation characteristics of actual power system,the technical requirements of applying the identification method of equivalent speed regulation system of regional power grid to actual power grid are analyzed.The idea of using MATLAB to compile parameter identification program and PSD-BPA to build joint parameter identification of simulation system is put forward,and a simple and feasible realization method of joint simulation of MATLAB/PSD-BPA is put forward.Finally,parameter identification of equivalent prime mover and speed regulation system in real regional power grid is carried out,and the feasibility of this method is verified.