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| Life Estimation of Generator Side Converter Considering the Comprehensive Mission Profiles |
| Gao Bing1, Chen Minyou1, Yang Fan1, Shao Weihua1, Fu Jin2 |
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. Electric Power Research Institute State Grid Chongqing Electric Power Company Chongqing 401120 China |
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Abstract The insulated gated bipolar transistor (IGBT) suffers from complicated power loadings and is one of the weakest components in wind system. At present, researches mainly focus on a selected and tough operation environment in very short term or steady cases, taking no consideration on the long term variations of wind speed and ambient temperature. Therefore, a more detailed life consumption assessment model was built to evaluate the lifetime. Meanwhile, a wind energy conversion system was regarded as a case study. The characteristics of life consumptions under different time constant thermal loadings were discussed, as well as the relationship between wind speed probability density and life consumption. Furthermore, the influence of ambient temperature simplified methods on lifetime assessment was discussed. The experimental results indicate that the lifetime consumption caused by low frequency thermal loadings is dominant, which contributes to more than 64.42% of the whole lifetime. Variation of wind speed probability and fundamental frequency life consumption areserious unsymmetrical. More than 60% of life is consumed in high wind speed, which is with small probability density. Whereas different ambient temperature equivalent methods have great influence on different time constants thermal loadings. The ambient temperature fluctuation has little effects on fundamental frequency life consumption, which may induce a decreasing of 12.26% for low frequency lifetime calculation.
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Received: 24 September 2015
Published: 19 July 2017
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2017, Vol. 32 
