Study On Calculation Methods Of Electromagnetic Transient Initialization In Power System

This paper mainly studies the initialization calculations of electromagnetic transient of power system.This work was supported by the State Grid Corporation of China under Contract XTB51201802842.Currently,the widely used initialization method in electromagnetic transient programs(EMTP)has problems such as low calculation efficiency and insufficient convergence.To solve these problems,this article proposes two alternative methods.In order to solve the problem of low efficiency of initialization calculation,this paper uses Kahan method for electromagnetic transient initialization calculation for the first time,and proposes an electromagnetic transient initialization calculation method based on Kahan method.This method has the same calculation accuracy and numerical stability as the traditional numerical method,but it does not require any iteration in each step of the integration,which can effectively improve the calculation efficiency of electromagnetic transient initialization.The second type of method not only solves the low computational efficiency,but also takes into account the problem of insufficient convergence.Theoretical analysis and numerical test results show that the initialization can be described as a two-point differential boundary value problem.For this reason,a class of electromagnetic transient initialization method based on the boundary value calculation method and the corresponding solving technology are proposed for the first time.And compared with the traditional EMTP-type initialization,this method has the convergence characteristics of the strict Newton method,to ensure the accuracy of the initialization while improving the convergence rate and the computational efficiency of electromagnetic transient initialization.