用于贯通式牵引供电系统的级联型变换器可靠性研究  

Reliability Research of Cascade Converter for Advanced Traction Power Supply System

作　　者：何晓琼[1,2] 荆蕾 韩鹏程 曾理[1] 高仕斌 HE Xiaoqiong;JING Lei;HAN Pengcheng;ZENG Li;GAO Shibin(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China;National Rail Transit Electrification and Automation Engineering Technology Research Center,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院,四川成都611756 [2]国家轨道交通电气化与自动化工程技术研究中心,四川成都611756

出　　处：《铁道学报》2023年第8期47-56,共10页Journal of the China Railway Society

基　　金：国家自然科学基金(52077181)。

摘　　要：针对贯通式牵引供电系统的核心装备级联型变换器,提出一种考虑变换器全运行状态的可靠性评估方法并进行可靠性优化研究,为新型牵引供电系统的应用及推广提供依据。基于故障树和Markov理论,分级建立级联型变换器可靠性模型,并提出一种考虑级联型变换器正常、存活和失效3种状态的状态转移概率的计算方法。为满足新系统工程应用所需的高可靠性设计需求,进一步研究变换器可靠性优化方法:基于所建立的可靠性模型,定量分析不同关键器件的重要度,辨识变换器可靠性组成的薄弱环节;从器件冗余和子模块冗余两级进行可靠性优化,对比后备冗余和工作冗余的优化效果,并对不同冗余数目下变换器可靠性的提升程度进行分析,同时验证所建立模型的准确性。设计综合冗余策略,通过算例分析验证了其有效性。Aiming at the cascade converter,which is the core equipment of the advanced traction power supply system,a reliability evaluation method considering the full operating state of the converter was proposed and reliability optimization was studied,providing a basis for the application and promotion of new traction power supply system.Based on the fault tree analysis and Markov theory,the reliability models of submodule and itself of cascade converter were established in stages.Meanwhile,a calculation method of state transition probability considering the normal,survival and failure states of cascade converter was proposed.In order to meet the high reliability design requirements required for new system engineering applications,the reliability optimization methods for converters were further studied:Using the established reliability model,a quantitative analysis was conducted on the importance degree of different key devices to identify the weak parts of the reliability of the converter.Reliability optimization was studied from two levels:device redundancy and sub-module redundancy,to compare with the optimization effects of backup redundancy and working redundancy.Along with the analysis of the reliability improvement of the converter with different redundancy numbers,the accuracy of the established model was verified.Finally,a comprehensive redundancy strategy was designed,and its effectiveness was verified by a numerical example.

关 键 词：级联型变换器 可靠性模型 MARKOV 状态转移概率 冗余设计 

分 类 号：TM922.3[电气工程—电力电子与电力传动] U223.6[交通运输工程—道路与铁道工程]