城市轨道交通全直流照明系统设计探讨

针对目前LED照明灯具内置整流器存在效率低、谐波含量高、电解电容易损坏的缺点,讨论在城市轨道交通中使用全直流照明系统的可行性。结合城市轨道交通的特点,直流照明系统的电压建议为220V,通过验算末端电压损失,证明更低电压虽然安全性更好,但难以满足轨道交通的实际需求。有两种可行的整流方案,一种是在变电所集中整流,另一种是分散整流,对这两种方案的用房和造价进行对比分析,研究认为基于当前的现状考虑,配电室及应急照明电源室分散整流方案是一种比较好的过渡方案,此方案被接受后,再过渡到变电所内集中整流方案。

Full DC Lighting System for Urban Rail Transit

To address the disadvantages of low efficiency, high harmonic content, and weakness of electrolytic capacitor of built-in rectifiers in LED lighting fixtures, the feasibility of using a full DC lighting system in urban rail transits is discussed. Based on the characteristics of urban rail transit, the voltage of DC lighting system is taken as 220 V. By checking the voltage loss at the end of the system, it is proved that the lower voltage is safer; however, it is difficult to meet the actual needs of rail transit. There are two feasible rectification schemes: centralized rectification in substations, and decentralized rectification. According to the comparative analysis, the decentralized rectification scheme of distribution room and emergency lighting power supply room is shown to be a better transition scheme, which is accepted and then transited to the centralized rectification scheme in substations.