新型城市轨道交通接触网融冰方法研究

提出一种新型城市轨道交通接触网融冰方案,其核心思想是利用具有四象限变流功能的中压能馈装置在中压环网与接触网之间形成不断流动的融冰电流,在接触网导线电阻中产生热量使得覆冰融化。基于布尔斯道尔夫理论,研究不同接触网供电制式下的防冰电流、最小融冰电流与最大融冰电流以及给定环境条件和时间内融冰电流的计算与选取方法;提出4种融冰电流循环方式,并通过仿真验证控制策略的有效性,达到预期效果;基于2 MW的中压能馈装置进行融冰模拟试验,通过对试验数据的分析和总结,验证融冰方案的可行性和可靠性。

New Ice-melting Method of Urban Rail Transit Catenary

This paper proposes a new ice-melting method of urban rail transit catenary which uses a medium-voltage energy-fed device with the capability of four-quadrant converters to form a current circulation path between medium-voltage AC grid and ice-covered catenary, thereby producing Joule heat for ice melting. This paper calculates the anti-icing current, minimum ice-melting current, maximum ice-melting current, ice-melting under certain weather conditions, ice-melting time; and also proposes a method of ice-melting selection based on Burstauer theory. Four energy cycles of ice-melting are proposed, and the effectiveness of the control strategy is verified by simulation to obtain the expected results. Therefore, ice-melting was performed using a 2-MW medium-voltage energy-fed device and the feasibility of the energy cycle ice-melting scheme was verified by analyzing and summarizing the test data.