基于负面清单的牵引供电系统供电能力评估

Assessment of power supply capacity for traction power supply system based on negative list

在电气化铁路服役的全生命周期内,供电能力评估贯穿于初期方案设计、线路开通运行及后期升级改造的全过程。基于现行标准及现场检修“痛”点与薄弱点,本文首先分析影响牵引供电性能的因素,从牵引变压器负载能力和接触网供电质量两个方面确定包含绕组热点温度、变压降容率在内的5项细分指标;然后基于负面清单的管理模式,对核心指标进行扣分评判,以不足阈值分数作为系统异常的标准,并进一步采用层次分析法设定各个指标层的权重,建立牵引供电系统实时供电能力评估体系;最后基于部署平台获得的神朔铁路实测数据验证评估体系的可行性。结果表明,相应供电区段在凌晨2:00—2:30存在评估分数低于70分的情况,基于此,进行异常溯源,调整相应时段的行车组织并辅助现场检修,从而提高系统运行可靠性与检修效率。

During the whole life cycle of electrified railway,power supply capacity assessment is carried out throughout the initial scheme design,line operation,and upgrading and transformation.Based on the existing standards and pain points and weak points of field maintenance,this paper analyzes the factors affecting the performance of traction power supply system.Five sub-indicators including winding hot spot temperature and transformer drop capacitance are determined from the aspects of traction transformer load capacity and catenary power supply quality.Then,the core indexes are deducted and judged based on the management mode of negative list.The threshold scores are used to estimate the system abnormality.Analytic hierarchy process(AHP)is further used to set the weights of each index layer to establish a real-time power supply capacity assessment system.Finally,the feasibility of the assessment system is verified based on the measured data of Shenshuo railway obtained from the deployment platform.The results show that the corresponding power supply section has an assessment score lower than 70 from 2:00 am to 2:30 am.Based on this,abnormal tracing is carried out,and the train organization during the corresponding time is adjusted to assist the on-site maintenance,which can improve the system operation reliability and maintenance efficiency.