The Reliability Analysis Of Converter Used In The Advanced Co-phase Traction Power Supply System And The Train-mounted Power Electronic Transformer

As a new technique in the field of the traction power supply system,the application of the advanced co-phase traction power supply system has great influence on popularization and application based on its reliability.At present,there is no research about the reliability of the advanced co-phase traction power supply system’s three-phase to single-phase converter and the train-mounted power electronic transformer.This paper provides a targeted analysis of the reliability of power electronic components and equipment.Firstly,this paper provides a calculation method of key components failure rate according to the systemic characteristic of the three-phase to single-phase converter for the advanced co-phase traction power supply system and the train-mounted power electronic transformer.It analyzes and contrasts reliability analysis methods which are commonly used,and selects the k/n(G)analysis method to analyze the reliability of the system structure mentioned in the paper.It introduces the analysis method of the hot standby and cold standby system,and gives the analytic strategy of the system in the paper.Considerrating system parameters comprehensively,it selects reliability analysis indicators and System redundancy design theory.It provides design and selection criteria of the relevant parameters and methods of the three-phase to single-phase converter and the train-mounted power electronic transformer.The paper introduces the basic model of the advanced co-phase traction power supply system,the three-phase to single-phase converter structure for the advanced co-phase traction power supply system and train-mounted power electronic transformer structure.It adopts respectively 2-level,3-level diode clamped and 5-level diode clamped transformer structure and calculates each transformer’s reliability indicators and provides a optimization design for the system structure referring to the system parameters.It contrasts different level-number transformers’mean time to failures and the influence on the system’s reliability of the optimized Hot standby and Cold standby system,and gives the optimal structure selection results.It carries on the design of the new traction substation based on the three-phase to single-phase converter’s topological structure,which meets the requirement of the substation capacity,and analyzes reliability and chooses the most preferred type.Combining with the development of power electronic devices,this paper analyzes the train-mounted power electronic transformer’s reliability based on Si IGBT and SiC MOSFET.The paper introduces the basic model and structure of the train-mounted power electronic transformer.It carries on reliability analysis of 2-level and 3-level structure respectively,combining the parameters which the system presets,and contrasts different redundant module numbers,structure on reliability.It gives index comparison and finds out the optimal plan.Meanwhile,it introduces different train-models’ IGBT failure rate cases and the cause analysis of failure rate under special circumstances in practical operating conditions.As SiC MOSFET can sustain the high voltage,this paper presents the train-mounted high-power electronic transformer’s topological structure and analysis of reliability which contrasts two kinds of materials’ power electronic transformers’ reliability and gives the most optimization model.At last,the two-dimensional interpolation function is adopted to calculate the interpolation of the train-mounted power electronic transformer’s key components’ volume and weight and get the function relation.The paper implements a result that we can calculate corresponding estimated value of volume or weight by any given components parameters within the scope,which could be reference for engineering design.It combines practical device parameters,analyzes and contrasts the optimal option and price of the train-mounted power electronic transformer which is based on Si IGBT.It presents MATLAB GUI interface,which facilitates designers to calculate the estimated value of volume and weight rapidly according to parameters and the number of devices,so that modeling of engineering can be benefited.Given all that,this paper analyzes,contrasts and optimizes the reliability of the three-phase to single-phase converter structure which is used for the advanced co-phase traction power supply system and the train-mounted power electronic transformer structure,combining the theoretical analysis,so that the system’s reliability improves and its mean life extends.The paper carries on the analysis of systems of various models,materials,topological structure in turn and gives the optimal solution at last.The system approach is good,and can be used for reference in the engineering application.