西南交通大学学报2023，Vol.58Issue(6)：1240-1247,8.DOI:10.3969/j.issn.0258-2724.20220723
重载铁路树形贯通式同相供电系统的运行状态
Operation Status of Tree Continuous Co-phase Power Supply System of Heavy-Haul Railways
摘要
Abstract
The tree continuous co-phase power supply system of heavy-haul railways can minimize the safety hazards caused by neutral sections in the line and improve the utilization rate of regenerative braking energy,power supply capacity,and power quality of the traction power supply system.In order to make the tree continuous co-phase power supply system run smoothly,the operation status of the system was studied from four aspects:equalizing current,power supply capacity,negative sequence evaluation,fault analysis,and protection configuration.The equalizing current evaluation model of the bilateral power supply system under different topologies was constructed to reveal the external power supply composition of the tree continuous co-phase power supply system of heavy-haul railways.With the tree continuous co-phase power supply transformation scheme of a heavy-haul railway as an example,the power supply capacity of the system under normal and fault conditions and the negative sequence impact on the external power grid were explored.Different types of faults in the system were analyzed,and the protection configuration scheme of the system was proposed.Compared with parallel bilateral power supply,the results show that the tree continuous co-phase power supply system will not produce an equalizing current when the transformer ratios of two adjacent traction substations are the same.The minimum voltage of the up and down traction network of the transformation scheme is 22.74 kV,which meets the voltage requirements of the traction network.By setting the combined co-phase power supply device,the 95%probability value and maximum value of the three-phase voltage unbalance factor of the system are 1.20%and 1.65%,respectively.Compared with the traditional protection device scheme,the proposed protection configuration scheme can ensure the minimum outage interval of the traction network.关键词
重载铁路/贯通式同相供电/均衡电流/供电能力/分段保护Key words
heavy-haul railway/continuous co-phase power supply/equalizing current/power supply capacity/segment protection分类
动力与电气工程引用本文复制引用
康德建,易东,王辉..重载铁路树形贯通式同相供电系统的运行状态[J].西南交通大学学报,2023,58(6):1240-1247,8.基金项目
国家能源投资集团有限责任公司重大科技项目(F1GD20200002) （F1GD20200002）
