An impedance arc model and its simulation method

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 the traditional time-varying resistance model, which retains the low-frequency zero-break characteristics of the arc current. The high-frequency path adopts the arc-gap capacitance model and considers The high-frequency charging and discharging process of the ground capacitance on both sides of the arc gap to the arc gap capacitance and the line impedance on the load side overcomes the limitations of the traditional arc model in the simulation of high-frequency characteristics of the arc current. Simulation method based on impedance arc model A fault arc generation circuit based on impedance arc model is built in SIMULINK, and the virtual simulation of arc faults with different load types can be realized by adjusting arc parameters, line parameters, load topology and parameters. Personnel can obtain a large amount of arc data only by means of simulation. There is no need to purchase a large number of loads and perform a large number of load experiments, which saves time and equipment costs.

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 a difficult point in 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 working current in the loop is smaller than the normal working current of the load. Arc fault. When an arc fault occurs, the high temperature arc is often accompanied by sputtering of the metal conductor. Once there are flammable and explosive items near the fault point, it is easy to cause a fire or even an explosion. The series arc fault always threatens the personal and property safety of the power system, especially the power system. [0003] The current focus of arc fault detection is the arc fault detection technology based on current characterist...

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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

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