Abstract:At present, domestic and foreign power grids lack the practical experience of applying DC ice-melting devices in large-scale applications. With the application of a large number of DC ice-melting devices, the impact on system voltage stability cannot be ignored. When the power grid was subjected to large-scale severe ice-covering disasters, a great number of line were severely covered with ice, and in order to ensure the safe operation of the power grid, ice melting operations must be performed simultaneously. Considering the safety constraints of the power grid, the principle of stratified zoning, line classification and meteorological factors and other constraints, different types of ice melting would be carried out for more lines. Through studying the voltage stability analysis of the operational ice-melting devices nodes in the real-time running system, the voltage strength of the existing real-time ice-melting device nodes was sorted, which lays the foundation for further research on the optimal scheduling strategy of DC ice-melting devices. Improving voltage levels, ameliorating power quality, providing specific strategies for the reactive power management of DC ice-melting devices that have been put into operation. It is of great theoretical and practical value to build a strong smart grid.