The frequent icing of a catenary in cold areas has seriously affected the normal operation of urban rail transit. Among many deicing methods for catenary, the thermal deicing method that uses current Joule heat to melt ice has been widely adopted due to its efficiency and safety. However, most of the thermal deicing methods are only applicable when the line is out of service, which cannot solve the icing problem of catenary during the operation period. In order to solve this problem, this article proposes a novel online thermal deicing method that takes the catenary of up and down lines as the deicing current loop. Based on the Bolsdorf theory, the deicing and anti-icing current of catenary are calculated, and the structure and control strategy of the deicing power unit (DIPU) are designed. The influence of online deicing on the traction power supply system is quantitatively analyzed by the electric network model. The accurate dynamic simulation model of the traction power supply system, including the DIPU, is established to verify the analysis conclusion. The results show that the online thermal deicing method has limited influence on the traction power supply system but achieves good deicing performance in the normal operation of the line.

中文翻译：

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城市轨道交通接触网的在线热除冰方法

寒冷地区悬链线的频繁结冰严重影响了城市轨道交通的正常运行。在悬链线的多种除冰方法中，利用当前的焦耳热融冰的热除冰方法因其效率和安全性而被广泛采用。然而，大多数的热除冰方法仅在管线停止运行时才适用，这不能解决运营期间接触网的除冰问题。为了解决这个问题，本文提出了一种新颖的在线热除冰方法，该方法将上下线路的接触网作为除冰电流回路。基于Bolsdorf理论，计算了悬链线的除冰和除冰电流，设计了除冰动力装置（DIPU）的结构和控制策略。通过电网模型定量分析了在线除冰对牵引供电系统的影响。建立了包括DIPU在内的牵引供电系统的精确动态仿真模型，以验证分析结论。结果表明，在线热除冰方法对牵引供电系统影响不大，但在线路正常运行中仍具有良好的除冰性能。