Low Harmonic DC Ice Melting Device Capable of Reactive Power Compensation with SVG

The transmission line' ice melting device is widely used in the field of power grid ice melting due to its advantages of high ice melting efficiency and small power supply capacity. However, reactive power needs to be consumed during DC ice melting. When the demand for reactive power capacity is large, the voltage fluctuation of substation may be caused, which affects the reliability of power supply. In addition, a large number of 5th and 7th harmonics will be generated during ice melting rectification, and a large filtering device needs to be installed. In this paper, a low harmonic DC ice melting device which can compensate reactive power simultaneously is studied. The ice melting and reactive power compensation function can operate at the same time to meet the dynamic reactive power demand of ice melting. At the same time, the main and sub harmonics injected into the grid by the ice melting rectifier are eliminated. The experimental and simulation research on the device are carried out which is installed in the 500 kV Chuanshan substation. The actual ice -melting is carried out on the 500 kV Chuansu I line which takes only 68 minutes to melt the ice. The results prove the feasibility of the proposed DC ice-melting device in this paper.