With the continuous development of UHV DC transmission technology,it is of great significance to improve the relia-bility level of transmission system to guarantee the coordinated development of China's electric power and economy.As a key device in the large-capacity power electronic equipment such as converter valve of UHV DC transmission system,thyristor's long-time safe and stable operation is the basis for realizing China's important energy strategy such as sending electricity from west to east.The relia-bility study,degradation assessment,failure analysis and life prediction of thyristors have become the key engineering frontier issues nowadays.This paper systematically analyzes the causes and mechanisms of thyristor device degradation and failure;explains in detail several typical reliability test methods and their respective evaluation models for degradation monitoring and life prediction,and em-phasizes the significance of accelerated aging test model in the reliability study by combining specific cases.In this paper,the future development of thyristor reliability research is prospected,and the research idea of cutting-edge technology crossover is put forward.
关键词
大功率半导体/晶闸管/失效分析/可靠性研究/寿命预测
Key words
power semiconductor/thyristor/failure analysis/reliability research/life prediction
维普
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