摘要
IGBT模块温度在线监测是提高大容量变流器可靠性的关键技术。在IGBT模块在线温度监测方法中,热阻模型法可对IGBT模块内部的温度分布进行估计,因而受到关注。结合了传感器数据的温度观测器可基于热阻模型,实时修正材料老化、参数温度依赖性和功率损耗计算误差等不确定因素对温度估计造成的影响。然而现有热模型无法同时兼顾系统可观性和建模准确性,且阶数相对较高,难以应用于温度观测器的在线运行。因此,该文提出了一种适用于风冷散热多芯片IGBT模块3-D温度观测器,同时满足可观性、准确性和实时性要求的混合型降阶热模型。首先,分析了热阻模型的拓扑结构及其参数辨识的方法,并探究了模型的状态空间生成规律;然后,基于非线性优化算法对该模型的参数进行修正,以减小因计算流体力学(CFD)仿真模型参数与实际参数不一致所引入的热阻模型与实验物理对象间的误差;随后,使用平衡截断法对热阻模型降阶,相对于现有集总参数热阻模型,进一步提高了实时求解效率;最后,通过仿真和实验验证了所提模型的准确性。
Online monitoring of IGBT module temperature is a key technology for enhancing the reliability of high-power converters.Among the various online temperature monitoring methods for IGBT modules,the thermal network method has garnered attention due to its ability to estimate the internal temperature distribution within the IGBT module.The temperature observer based on the thermal network model can correct the model by utilizing measurement information to reduce the impact of aging,temperature-dependent material parameters,and power loss calculation errors on temperature estimation accuracy.However,existing thermal models struggle to balance system observability and modeling accuracy,and their high model order complicates their application in temperature observers.Therefore,an observable reduced-order hybrid 3-D thermal model suitable for temperature observer for forced air-cooling multi-chip IGBT modules is proposed in this paper.Firstly,a hybrid thermal network combining the strengths of the 3-D Cauer model and the Foster model is introduced for air-cooling multi-chip IGBT modules.This model ensures both thermal modeling accuracy and observability for air-cooled IGBT modules.Based on this model's structure,the corresponding state-space expression is also derived.Secondly,a nonlinear optimization algorithm is employed to refine and calibrate the thermal network model using experimental temperature measurements,reducing the deviation between thermal model parameters and actual parameters caused by uncertain material parameters in the computational fluid dynamics(CFD)model.Finally,the balanced truncation method is utilized to further reduce the order of the proposed thermal network model's state space while maintaining model accuracy.In summary,the main contributions of this paper are:(1)The proposed lumped parameter 3-D thermal network model addresses the challenge that existing reduced-order thermal models cannot accurately model air-cooling IGBT modules with system observability.The error between the proposed ther
作者
田野
卜凯阳
李楚杉
李武华
何湘宁
Tian Ye;Bu Kaiyang;Li Chushan;Li Wuhua;He Xiangning(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;Zhejiang University-University of Illinois at Urbana-Champaign Institute,Haining 314400,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2024年第16期5104-5120,共17页
Transactions of China Electrotechnical Society
基金
国家重点研发计划(2022YFE0138400)
浙江省重点研发计划(2023C01061)资助项目。
关键词
IGBT模块
温度监测
热网络模型
温度观测器
IGBT module
temperature monitoring
thermal network model
thermal observer
