风电变流器IGBT模块通断延迟时间结温探测模型研究  

Study on Junction Temperature Detection Model Based on Turn-on and-off Delay Time of IGBT Modules in Wind Power Converters

作　　者：姚芳[1] 马静[1] 张彧硕 唐圣学[1] 黄凯[1] 李志刚[1] Yao Fang;Ma Jing;Zhang Yushuo;Tang Shengxue;Huang Kai;Li Zhigang(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China;Experimental Training Center,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津300130 [2]河北工业大学实验实训中心,天津300130

出　　处：《天津大学学报（自然科学与工程技术版）》2019年第8期862-870,共9页Journal of Tianjin University：Science and Technology

基　　金：国家科技支撑计划资助项目(2015BAA09B01);国家自然科学基金资助项目(51377044);河北省自然科学基金资助项目(E2017202284);河北省教育厅青年基金资助项目(QN2017316)~~

摘　　要：针对风电变流器中绝缘栅双极型晶体管(insulated gate bipolar transistor,IGBT)开关,研究基于通断延迟时间风电变流器IGBT模块结温探测方法.首先,从半导体物理机理视角分析了通断延迟时间的温敏机理和温敏特性,明确了本征载流子浓度、电流增益和载流子迁移率等影响通断延迟时间的物理因素.然后,设计IGBT模块的动态测试试验,测试不同母线电压或不同集电极电流条件下,通断延迟时间与结温的关系,并对试验结果进行分析.动态测试试验采用双脉冲法二极管钳位电路,提高通断过程栅极电压和集电极电流的动态特性测试精度,采用恒温控制底板加热设备,控制IGBT芯片温度.再后,对IGBT模块开关过程中不同结温下集电极电流和栅极电压波形进行分析,考虑电压电流影响的条件下,建立了基于开通及关断延迟时间的结温探测模型,并对比研究了模型精度.结果表明,基于关断延迟时间的结温探测精度较高、稳定性更强,且母线电压越高或者集电极电流越低,则关断延迟时间越大.最后,建立了基于关断延迟时间的IGBT结温探测模型,该模型考虑电压和电流影响,拟合精度高,平均相对误差小,可用于热平衡态风电变流器的IGBT模块的工作结温探测.This study investigates the junction temperature detection method based on turn-on and-off delay time of insulated gate bipolar transistor(IGBT)modules for IGBT switches in wind power converters.The results are important in monitoring the thermal safety and reliability of wind power converters.First,the temperature-sensitive characteristics and mechanism of turn-on and-off delay time are analyzed by considering the physical mechanism of semiconductors. The physical factors that influence turn-on and-off delay time,such as intrinsic carrier concentration, current gain,and carrier mobility,were defined.Furthermore,the IGBT modules were tested to detect the dynamic characteristics and explore the relations between turn-on and-off delay time and junction temperature under various bus voltages or collector currents.Moreover,the test results were analyzed.Diode clamping circuit and double-pulse method were used in the test.Thus,the measurement accuracy of dynamic characteristics of gate voltage and collector current during the on-off process was improved.The constant temperature control floor was used to heat the module sample and maintain its thermal balance.In addition,the waveform of collector current and gate voltage under various junction temperatures in the switching process of the IGBT module were analyzed.Considering the influence of voltage and current,the junction temperature detection models based on turn-off delay time were established and the detection accuracy rates of these models were compared.The results showed that the junction temperature detection accuracy and stability based on turn-off delay time were higher.When the bus voltage was higher or the collector current was lower,the turn-off delay time was longer.Finally,a junction temperature detection model based on turn-off delay time was established by considering the influence of voltage or current.The validation showed that the IGBT module junction temperature detection model based on turn-on and-off delay time was characterized by high fitting a

关 键 词：风电变流器 IGBT 模块 结温 通断延迟时间 

分 类 号：TM46[电气工程—电器]