轨道交通长距离用电设备直流配电方案研究

Research on DC Power Distribution Scheme for Long-distance ElectricalEquipment of Rail Transit

针对轨道交通长距离用电设备常规配电方案存在造价高、电压质量差等问题,提出一种长距离用电设备直流配电技术方案,以达到提高电压质量、降低工程造价的目的。首先,结合轨道交通长距离用电设备种类多、分布广、可靠性要求高的特点,对直流配电系统的电压等级、供电容量、拓扑结构等关键技术进行深入分析。然后,对适用于低压配电领域的换流器关键参数给出设计原则和计算方法,在此基础上,提出了电压协调控制策略,以保证电压的稳定性。最后,基于PSCAD/EMTDC仿真验证了所提技术方案的有效性。此外,考虑用电设备的不同配电距离,对常规方案和直流方案的工程造价进行比较,研究结果表明直流配电经济性优势明显,该技术方案对今后轨道交通长距离配电的规划、设计具有一定的指导价值。

Aiming at the problems of high cost and poor voltage quality in the conventional power distribution scheme of long-distance electrical equipment of rail transit,a technical scheme of DC power distribution for longdistance electrical equipment was proposed to achieve the purpose of improving voltage quality and reducing project cost.First of all,combining with the characteristics of long-distance electrical equipment of rail transit,such as many types,wide distribution and high reliability requirements,the key technologies such as voltage level,power supply capacity and topology structure of DC power distribution system were deeply analyzed.Then,the design principles and calculation methods were given for the key parameters of the converter suitable for low-voltage power distribution.On this basis,a voltage coordination control strategy was proposed to ensure the stability of the voltage.Finally,the effectiveness of the proposed technical scheme was verified based on PSCAD/EMTDC simulation.In addition,considering the different distribution distances of electrical equipment,the engineering cost of the conventional scheme and the DC scheme was compared.The research results show that the economic advantage of DC power distribution is obvious.In the future,the technical scheme has certain guiding value for the planning and design of long-distance power distribution of rail transit.