考虑机侧变流器复杂热载荷特性的寿命评估

doi:10.19595/j.cnki.1000-6753.tces.151590

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摘要风电机侧变流器中绝缘栅双极型晶体管（IGBT）模块运行时承受着复杂的多时间常数特性热载荷,是风电系统中最为薄弱的环节之一。然而现有研究更多是简单选取工作点数据或者仅考虑稳态工况以及无法考虑外部环境的长期随机变化。因此,本文建立了一种能够综合计及IGBT模块热载荷的复杂时间常数特性影响的寿命评估模型。分析了实际风电场中不同时间常数热载荷的寿命消耗特点,以及风速分布与寿命消耗之间的关系。研究了不同气温等效方法对寿命评估的影响规律,最后通过实验验证了该方法的准确性。结果表明,双馈风机中低频周期热载荷造成的寿命消耗更为严重,占到整体寿命消耗的64.42%。基频周期寿命消耗与风速概率密度具有严重的不对称性,超过60%的IGBT模块寿命主要消耗在低概率密度的高风速区间。气温等效方法对基频周期热载荷影响可以忽略不计,而忽略气温波动将导致低频周期寿命消耗评估结果减小12.26%。

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关键词 ：机侧变流器, 热载荷, 寿命消耗, 气温波动

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.

Key words： Generator side converter thermal loading life consumption temperature fluctuation

收稿日期: 2015-09-24 出版日期: 2017-07-19

PACS:

TM386

基金资助:国家重点基础研究发展计划（973计划）（2012CB25200）,国家自然科学基金（51477019）和中央高校基本科研业务费（106112015CDJXY150004）资助项目

通讯作者: 高兵男,1987年生,博士研究生,研究方向为新能源发电转换系统状态监测。E-mail: 785208784@qq.com

作者简介: 陈民铀男,1954年生,教授,博士生导师,研究方向为智能控制与建模、人工智能的工程应用及新能源发电转换系统的寿命评估。E-mail: mchencqu@126.com

引用本文:

高兵, 陈民铀, 杨帆, 邵伟华, 伏进. 考虑机侧变流器复杂热载荷特性的寿命评估[J]. 电工技术学报, 2017, 32(13): 88-99. Gao Bing, Chen Minyou, Yang Fan, Shao Weihua, Fu Jin. Life Estimation of Generator Side Converter Considering the Comprehensive Mission Profiles. Transactions of China Electrotechnical Society, 2017, 32(13): 88-99.

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