| China’s electrified railway system features its large operating mileage, heavy transportation assignments and covering a wide territory, and thus plays an important role in our national economic developments. Ice or snow may accumulate on catenaries in some harsh natural environments, threatening the safe operation of power grids and traction power supply systems. In some severe cases, catenary may even fall down and thus result in breakdown of the railway transportation. With the continuous development of the electrified railways and especially the passenger railway lines in the past few years, the adverse effects will be more prominent in the future.Firstly, the characteristics of catenary ice-coating and de-icing are analyzed, and a theoretical model of de-ice is presented in this paper. The characteristics, wire-connection and operating mode of traction power supply system in passenger railway lines are studied to obtain the relevant parameters and circuit model. Secondly, two schemes are presented to tackle the catenary ice-coating problem, i.e., AC anti-icing scheme and DC anti-icing scheme. As to the former scheme, it is suggested that the ice-coating catenary be connected to earth through a resistor to melt ices on-line or off-line. The de-icing model and parameters are determined, and the control strategies and protection outline are put forward and a simulation is conducted as well. As for the later scheme, two possible plans are designed, i.e., single-phase rectification plan and three-phase rectification plan. The two plans are studied via simulation, and the impacts on power grids are analyzed as well. Based on the analysis, the more practical DC anti-ice plan is determined. And the control strategies and protection outline are also presented. Finally, the AC and DC de-icing scheme are compared on techniques, economies, and operating, the more practical scheme is recommended. And the engineering design of the Catenary anti-icing and de-icing system is carried out. |
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