Application Research Of Improved Nonlinear Power Flow Algorithm In Regional Power Grid

Power flow calculation is an important means to analyze the operating state of power systems,and power flow algorithm is an important tool for power flow calculation.In this paper,for the iterative non-convergence problem caused by improper initial value selection,the initial value selection theorem is used to give reasonable initial value,and the improved nonlinear power flow algorithm is used to form a set of algorithms for improving power flow calculation.The residual nonlinear method and the improved nonlinear power flow algorithm are used to simulate the power network in the north of Anhui.The results show that the improved algorithm is better than the preserving nonlinear method.This paper first analyzes the basic principle of power flow calculation of Newton-Raphson method in power system.On the basis of studying the sensitivity of Newton-Raphson algorithm to initial value selection,the initial value selection theory is used to set the initial value of system power flow calculation.Then the structure of the retained nonlinear method developed by the Newton-Raphson method is analyzed,and an improved nonlinear power flow algorithm is formed.The improved algorithm is compared with the traditional Newton-Raphson method and the retained nonlinear method.The results show that the improved nonlinear power flow algorithm can effectively reduce the number of iterations and improve the convergence speed.Aiming at the actual situation of a power station in the northern part of the country,the conversion process after the autotransformer model change is considered,which solves the difficult situation of the three-winding transformer processing in programming.For the main wiring system of the power station,the power flow calculation of the power station is realized by the reserved nonlinear method and the improved nonlinear power flow algorithm respectively,and the performance of the two algorithms in this application is compared and analyzed in detail.Improve the superiority of the algorithm.Finally,the initial value selection theorem is used to obtain the initial value of the voltage under the convergence condition,and then the improved nonlinear power flow algorithm is used to form a method for calculating the power flow of the power grid.The power flow calculation of the power system in the northern part of the power system fully reflects the algorithm.Good convergence and the insensitivity to network topology.In this paper,the improved nonlinear power flow algorithm combined with the initial value selection theorem,the power flow calculation of the actual regional power grid and comparison with the real value,to provide a basis for quantitative calculation of the future planning and design of the power grid,so this paper has a higher practical value.Figure [26] table [21] reference [50]...