| Ice coating on catenary is a kind of natural disaster happens frequently in early winter and early spring about electrified railway. The major disaster distributed widely is difficult to repair. Ice coating on catenary hinders electric locomotive receiving current from catenary, influences the normal operation of electric locomotive, and may result in massive capsize in serious disaster. At present, the research project aimed at ice coating on catenary mainly emphasizes on deicing method rather than anti-icing measure. This paper researches a new anti-icing equipment. The equipment can provide reactive current for catenary using SVG, so that the Joule heat produced by the resistance of catenary can prevent catenary from freezing.At first, this paper analyses the physical process of ice coating on catenary and builds the heat exchange equation on process of ice coating. And then, the main weather factors affecting ice coating are analyzed, containing the wind speed, temperature, liquid water content in air and sunshine, as the same as the diameter of contact line and impedance. The pattern of growth on ice coating on centenary is varied in different weather conditions. The glaze and mixed song have big damage to catenary, so the anti-icing equipment is mainly used to prevent catenary from forming glaze. According to the weather condition of ice coating of glaze, the critical anti-icing current can be got, and the capacity of anti-icing equipment can be calculated. Because the weather changes frequently, this paper designs monitoring system of anti-icing to make anti-icing equipment rapid response with the change of external environment, which can calculate the current of anti-icing and give the right order current of anti-icing equipment.In the end, the paper simulates the main circuit of the anti-icing equipment with MATLAT/simulink, and the right results indicate the validity of the design scheme and the control method of anti-icing equipment. |
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