Life Evaluation Method of DC-Link Capacitor Considering ESR Aging
This paper takes the metallized film DC-link capacitors commonly used in high-speed trains as the research object,a DC-link capacitor lifetime evaluation method considering ESR aging and mission profile is studied based on the existing theory and research foun-dation.Firstly,starting from the physical structure and failure mechanism of film capacitors,the degradation characteristics of the capaci-tor failure process are analyzed;then the electrical stress and thermal stress of film capacitors are discussed;Finally,combined with the actual train test data of a certain line,the lifetime of the DC-link capacitor is evaluated based on the empirical life model,the linear cu-mulative damage theory and the aging model of the equivalent series resistance ESR.The research results will provide references for re-ducing the maintenance cost of traction converters and promote the optimization of high-speed train maintenance procedures.
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