Impedance arc model and simulation method thereof

Abstract

The invention relates to an impedance arc model and a simulation method thereof. The impedance arc model divides the generation path of the arc current into a low-frequency path and a high-frequency path, the low-frequency path adopts a traditional time-varying resistance model, the low-frequency zero-rest characteristic of the arc current is reserved, and the high-frequency path adopts an arc gapcapacitance model. The high-frequency charging and discharging process of the ground capacitors on the two sides of the arc gap to the arc gap capacitor and the load side line impedance is considered, so that the limitation of a traditional arc model in arc current high-frequency characteristic simulation is overcome. According to the simulation method thereof, a fault arc generation circuit based on the impedance arc model is built in SIMULINK, and virtual simulation of arc faults of different load types can be achieved by adjusting arc parameters, line parameters, load topology and parameters. According to the method, researchers can obtain a large amount of arc data only through a simulation method. A large number of loads do not need to be purchased, a large number of load experimentsare conducted, and time cost and equipment cost are saved.

Description

technical field [0001] The invention relates to the field of series arc fault modeling, in particular to an impedance arc model and a simulation method thereof. Background technique [0002] Series arc fault is the difficulty of current power system fault monitoring. When a series arc fault occurs, due to the series relationship between the load and the arc and the impedance characteristics of the fault arc itself, the operating current in the loop is smaller than the normal operating current of the load, and the overcurrent protection technology based on the increase in the value of the fault current is difficult to detect. arc fault. When an arc fault occurs, the high temperature arc is often accompanied by sputtering of metal conductors. Once there are flammable and explosive items near the fault point, it is easy to cause a fire or even an explosion. Series arc faults always threaten the personal and property safety of the power system, especially the power system. ...

AI Technical Summary

Problems solved by technology

[0007] In view of this, in order to solve the data acquisition problem of the existing arc fault experimental method and the problem that the characteristics of the arc data based on the simulation modeling of the arc equivalent resistance model are greatly different from the measured data, the present invention provides an impedance arc model and its simulation method, by adjusting the circuit parameters, load parameters and fault initial phase angle, the virtual online simulation and arc data acquisition of series arc faults are realized

Images