电力电子系统可靠性模型综述

近年来,电力电子装置广泛应用于生产生活各个领域中,其可靠性日益为人们所重视,尤其随着科学技术的飞速发展,可靠性研究也亟需与时俱进。可靠性关乎产品质量,其作为产品和设备安全性的评估指标不仅涉及企业、国家的经济效益,还涉及使用者的人身安全。首先主要介绍了电力电子系统级可靠性建模的主要开展方法、步骤及常见的可靠性建模方式,其可靠性建模主要有故障分析、失效判据选取、可靠性模型选取、建模和定量计算评估等主要步骤,故障分析是可靠性分析的基础,通过故障分析可以得到系统的主要故障类型,并基于所选取的失效判据判断系统在各故障类型下的运行状态;然后根据系统的规模、精度要求以及应用场合选取合适的可靠性模型有利于准确评估系统的可靠性,建模后进行定量计算,得到相应的可靠性指标,由此分析总结系统的可靠性;再介绍了4种常见的系统级可靠性模型,并依次对各模型进行了分析比较,总结了4种模型的特点与适用范围;最后对研究内容进行了总结与展望。

An Overview of Reliability for Power Electronic Systems

In recent years,power electronic products have been widely used in the industrial production and everyday life,and the reliability has been paid more and more attention.Research of the reliability was expected to develop as well,especially with the fast development of the science and technology.It is not only about the quality,but also about the enterprises and nation''s economic benefit and users'' safety since it is an assessment index of products'' safety.This paper mainly introduces the method of carrying out modeling of the system-evel reliability of power electronic systems,the modeling steps and the models that are often used to analyze products'' reliability.The main steps are fault analysis,choosing failure criteria,choosing reliability models and quantitative calculation and assessment.Fault analysis is the basis of reliability analysis.By fault analysis,the main fault types of the system can be obtained and the condition of the system under faults on the basic of failure criteria can be estimate.Choosing suitable models according to the scale,accuracy requirement and applications of the system helps to get accurate assessment results.Assessment index can be calculated after modeling to analyze and summarize the reliability of systems.Four usual models of system-level reliability are introduced in this paper and the characteristics and applications of them are summarized.Finally,the article summarizes the main work and the deficiencies,and gives some prospects.