Method and device for calculating degree of accuracy of electromagnetic transient simulation result

Abstract

The invention discloses a method and device for calculating the accuracy of electromagnetic transient simulation results, and relates to the technical field of power system time-domain simulation. The method includes: setting at least two different simulation step sizes to be tested for the current power system Electromagnetic transient simulation to obtain corresponding simulation results to be tested; using the common divisor of the simulation step size to be tested as a benchmark simulation step size to perform electromagnetic transient simulation on the current power system to obtain corresponding benchmark simulation results; The simulation results to be tested, the benchmark simulation results, and the simulation steps to be tested are used to calculate the accuracy corresponding to the simulation steps to be tested. The invention uses the common divisor of the simulation step size to be tested as the reference simulation step size, and calculates the corresponding accuracy of the simulation step size to be tested through the reference simulation step size, thereby realizing accurate calculation of the electromagnetic transient simulation results of different simulation step sizes the accuracy.

Description

technical field [0001] The invention relates to the technical field of power system time-domain simulation, in particular to a method and device for calculating the accuracy of electromagnetic transient simulation results. Background technique [0002] There are components with different dynamic process time scales in the power system, such as power electronic equipment with fast dynamic process and generators, motors and other components with relatively slow dynamic process. In order to accurately describe the dynamic process of this type of system, it is often necessary to use detailed modeling electromagnetic transient simulation to achieve. [0003] The typical representative of electromagnetic transient calculation is the EMTP method, which belongs to the category of direct method. The basic principle of this method is to transform the differential equations of each dynamic element in the system into algebraic equations describing the Norton equivalent circuit of the e...

AI Technical Summary

Problems solved by technology

[0008]1) The electromagnetic transient simulation with different simulation steps has different solution time points, the simulation results have no one-to-one correspondence, and the maximum error of the instantaneous value cannot be calculated;

[0009]2) The simulation error of the electromagnetic transient simulation with different simulation steps is often larger at the initial time point, but the error will decay as the simulation time increases, The impact on the steady-state error is small. If the maximum error of the instantaneous value is used as the accuracy index, it is difficult to objectively evaluate the accuracy of the simulation under different step lengths.

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