风电变流器IGBT模块结温计算及功率循环能力评估

发布时间：2018-05-23 19:02

本文选题：双馈风电机组 + 变流器IGBT模块　；参考：《重庆大学》2014年硕士论文

【摘要】：由于风能的间歇式固有特征，风电机组长时间、频繁和大范围的随机出力变化，往往导致风电变流器IGBT模块（由绝缘栅双极型晶体管（IGBT）及晶体二极管（Diode）组成）持续承受剧烈的电热应力冲击，尤其是风电机组机侧变流器长期处于低频下运行，其IGBT模块因结温波动变化而导致其运行可靠性较低的问题凸显。为了准确获取风电变流器IGBT模块的结温并评估其运行可靠性，论文以双馈风电机组的变流器IGBT模块为对象，，研究其损耗及结温计算模型，并提出机侧变流器IGBT模块的功率循环能力评估方法。其选题符合我国大力发展风力发电的战略需求，研究成果对提高大功率风电变流器可靠性的状态监测水平有着重要的学术意义和应用价值。本文主要内容包括： ①在对IGBT模块封装结构及热传递过程深入了解的基础上，重点掌握器件的电热耦合特性及常见的失效机理，为进一步开展结温计算及功率循环能力的研究奠定基础。 ②为了准确计算变流器IGBT模块的结温，研究并建立了基于开关周期损耗分析方法的IGBT模块结温计算模型，针对实际IGBT模块，将本文结温模型的计算结果，与采用基于输出周期损耗分析的常规结温计算模型的结果进行比较，并和PLECS电力电子热仿真结果进行验证。 ③为准确分析双馈风电变流器IGBT模块损耗及结温的变化规律，考虑双馈风电机组运行特性和变流器控制策略，建立了双馈风电变流器IGBT模块损耗及结温计算模型，并分别对风电机组全运行工况下机侧和网侧IGBT模块的损耗及结温进行了研究。 ④为准确评估实际湍流风速对双馈风电机组机侧变流器IGBT模块功率循环能力的影响，基于雨流算法提取随机结温波动信息，建立了双馈风电机组机侧变流器IGBT模块平均故障间隔时间（Mean Time Between Failure，MTBF）的评估模型，并分析了不同湍流风速对其结温波动特性和功率循环能力的影响。上述研究内容为风电变流器IGBT模块结温的在线准确评估及湍流风速下模块可靠性的定量分析奠定了理论基础和技术支撑。
[Abstract]:Due to the intermittent inherent characteristics of wind energy, the long time, frequent and large range of random output changes of the wind power generator often lead to the persistent intense electric stress impact of the wind power converter IGBT module (the insulated gate bipolar transistor (IGBT) and the crystal diode (Diode)), especially the wind turbine side converter is in the low frequency for a long time. In order to obtain the temperature of the IGBT module of the wind power converter and evaluate the reliability of its operation reliability, the IGBT module of the dual feed wind power converter is used as the object, the calculation model of its loss and the junction temperature is studied, and the machine side converter IGBT is put forward. The evaluation method of power cycle capacity of the module is in line with the strategic demand of our country to vigorously develop the wind power generation. The research results have important academic significance and application value to improve the state monitoring level of the reliability of the high power wind power converter.
The main contents of this paper are as follows:
On the basis of thorough understanding of the package structure and heat transfer process of IGBT module, the electrothermal coupling characteristics and common failure mechanism of the device are emphasized, which lays the foundation for further research on the calculation of the junction temperature and the power cycle ability.
In order to calculate the junction temperature of the converter IGBT module accurately, the IGBT module junction temperature calculation model based on the switching periodic loss analysis method is studied and established. According to the actual IGBT module, the calculation results of the junction temperature model are compared with the results of the conventional junction temperature calculation model based on the output cycle loss analysis, and PLECS electricity. The results of the force electron thermal simulation are verified.
(3) in order to accurately analyze the variation of IGBT module loss and junction temperature of doubly fed wind power converter, considering the operating characteristics and converter control strategy of doubly fed wind turbine, the IGBT module loss and junction temperature calculation model of doubly fed wind power converter are established, and the loss and junction temperature of the IGBT module on the side and the net side of the wind turbine are respectively analyzed. The study was done.
In order to accurately evaluate the effect of the actual turbulence wind speed on the power cycle capacity of the IGBT module of the double fed wind turbine side converter, based on the rain flow algorithm to extract the random node temperature fluctuation information, an evaluation model of the average fault interval time (Mean Time Between Failure, MTBF) of the double fed wind turbine side converter is established and analyzed. The effect of turbulence velocity on the junction temperature fluctuation and power cycling capability is discussed.
The above research content lays a theoretical foundation and technical support for the on-line accurate evaluation of the junction temperature of the IGBT module of the wind power converter and the quantitative analysis of the reliability of the module under the turbulence wind speed.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;TN322.8

【参考文献】