摘要
针对风电变流器中的绝缘栅双极型晶体管(IGBT)工作结温估算精度低、难度大的问题,分析了IGBT模块的伏安特性和温敏特性,进而建立了一种基于饱和压降的结温估算物理模型;通过IGBT模块的伏安特性和温敏特性试验,获取了IGBT模块在不同集电极电流下的饱和压降温敏特性曲线,进而基于饱和压降提出了一种结温估算数学模型。研究结果表明,物理模型相比数学模型精度较高,但需获取器件各物理参数准确值,建模过程较复杂;数学模型无需了解器件物理机理,但精度相对较低。实际风电工况中可根据精度需要选择物理模型或数学模型,这为IGBT模块和风电机组的状态监测和安全评估提供了一种新思路。
According to the problem of low accuracy and high difficulty in estimating the working junction temperature of insulated gate bipolar transistors(IGBT)in wind power converters,the volt-ampere characteristics and temperature sensitive characteristics of IGBT module was analyzed theoretically.Then a junction temperature estimation physical model based on saturation voltage drop of IGBT was established.Through the volt-ampere characteristics and the temperature sensitive characteristics test of IGBT module,the saturation voltage drop temperature sensitive characteristics curves were obtained under different collector current of IGBT module,then a junction temperature mathematical model based on saturation voltage drop was proposed at the same time.The results show that the physical model is more accurate than the mathematical model,but it need get the exact value of the physical parameters of the device,and the modeling process is more complex.The mathematical model does not need to know the physical mechanism of the device,but the precision is relatively low.The physical model or mathematical model can be selected according to the accuracy in the actual working conditions,and it provides a new idea for condition monitoring and safety evaluation of IGBT modules and wind turbines.
作者
姚芳
胡洋
唐圣学
曹博
李志刚
YAO Fang;HU Yang;TANG Sheng-xue;CAO Bo;LI Zhi-gang(School of Electrical Engineering,Hebei University of Technology,Tianjin 300130,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2018年第8期26-33,共8页
Electric Machines and Control
基金
国家自然科学基金(51477040
51377044)
河北省科技支撑计划项目(13214303D
14214503D)
关键词
IGBT模块
工作结温估算
饱和压降
通态伏安特性
温敏特性
IGBT module
junction temperature estimation
saturation voltage drop
volt-ampere characteristics
temperature sensitive characteristics
