Abstract：The load of a submerged arc furnace has many advantages，such as large single-unit regulation

capacity，good communication conditions，easy control，and low economic retrofitting，making it an important

flexible regulation resource for the power grid. However，there is currently a lack of effective digital simulation

methods for modeling submerged arc furnace systems and their regulation characteristics. A time-domain digital

simulation model for the power supply system of an industrial submerged arc furnace was established，which

included an electric furnace transformer，short network，furnace body，and reactive power compensation，based on the actual electrical operating conditions of the submerged arc furnace.The power regulation characteristics of the submerged arc furnace were determined by representing the electrode regulation link with the time-varying arc

length calculated through the Newton downhill method. The equivalent time-varying resistance was obtained by

solving the arc differential equation using the Runge-Kutta method，enabling simulation of the power regulation

process of the submerged arc furnace.This was achieved by encapsulating it with a custom module and integrating it

with the system model to realize time-domain digital simulation. It is applicable to both AC submerged arc furnace

and various electrode control strategies，and can be widely used for simulating the load characteristics of submerged arc furnace，flexibility resource assessment，and as a simulation platform for participating in grid interaction research.

      Key words：submerged arc furnace；arcmodel；Newton downhillmethod；frequency support；digital simulation