A New Type of DC De-icing System for Transmission Lines

A new type of DC De-Icing system is presented for solving the problems of transmission line icing when ice disaster happens. The two sections of DC De-Icer and assistant decision-making platform are included in it. The DC De-Icer realizes removability by integrating the DC power in a tanksemi-platform trailer with modular design. The main circuit of the power is composed of six voltage sourced converter(VSC) modules, which combine chopper circuit. The control method of pulse width modulation(PWM) rectifying voltage regulation combined with constant current chopper and layered protection scheme are put forward to realize the stepless regulation of DC output current and stability operation. Based on the research of the DC De-Icing critical current and De-Icing time calculation model, DC De-Icing assistant decision-making platform is established with the combination of mini weather station. Served with DC De-Icer, the application of this platform will contribute to the increase of DC De-Icing efficiency and guarantee the safe operation of transmission line. As a integrated DC De-Icing plan, the system has been put into use in Jiangxi power grid. In view of DC De-Icer implement experience lack, the design and application method of this project will be good for the application of such kind of systems.