0+ error immune electromagnetic transient simulation algorithm used under sudden change of input quantity

Abstract

The invention relates to a 0+ error immune electromagnetic transient simulation algorithm used under the sudden change of input quantity and belongs to the technical field of electromagnetic transient analysis of an electric system. According to the method, by means of the impulse response invariable principle, numerical sampling of a continuous signal of the system corresponds to Z conversion of a discrete signal, and the fundamental form of an element based on operation conductance and a history current item is given. Based on the form, a system network equation is obtained according to the node analysis method, and a system electromagnetic transient simulation result is obtained according to the same steps. The method has the advantages that the truncation error is smaller than that generated through currently adopted methods and the 0+ error purpose is realized under the sudden change of the immune input quantity, achieves non-linear load modeling of the electric system, solves the problem of oscillation of an electronic power switch model state variable outburst value, and provides a new way for electromagnetic transient branch-level modeling of the electric system.

Description

technical field [0001] The invention relates to a 0+ error immune electromagnetic transient simulation algorithm in the case of a sudden change in input quantity, and belongs to the technical field of electromagnetic transient analysis of electric power systems. Background technique [0002] With the continuous expansion and interconnection of the power system scale and the increasing number of power electronic equipment, electromagnetic transient analysis technology has become a key technology for the safe and stable operation of the power grid. However, when conducting electromagnetic transient simulation of power systems, if there are switching actions on the network, network structure changes, faults, etc., which will cause jumps in state variables, if the traditional implicit trapezoidal algorithm is still used at this time, non-prototype numerical oscillations will occur , In addition, when the control system is simulated, the one-step time lag between the control syst...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a 0+ error immune electromagnetic transient simulation algorithm in the case of a sudden change in the input quantity, so as to realize immunity to the state quantity jump error when the state quantity jumps, avoid non-prototype oscillation phenomenon, and solve the problem of power system abnormality. Numerical Oscillation Problem of State Quantity Jump in Linear Load Modeling

Images