风电变流器IGBT模块有效工作芯片状态评估
EFFECTIVE CHIP NUMBER ASSESSMENT METHOD OF IGBT MODULE OF WIND POWER CONVERTER
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摘要: 针对风电变流器绝缘栅双极型晶体管(IGBT)芯片因键合线脱落而引起模块可靠性降低的问题,提出一种基于扇区内持续导通压降的IGBT模块有效工作芯片状态评估方法。首先,考虑IGBT模块开关导通时间短难以提取其导通压降信息,基于风电变流器空间矢量脉宽调制(SVPWM)控制策略,提出其导通持续时间为1/6周期扇区内导通压降的特征信息;其次,基于导通压降和电流关系,推导IGBT模块导通压降特征信息与IGBT有效工作芯片数目的表达式,构建IGBT模块因键合线完全脱落下有效工作芯片的状态评估模型;最后,搭建模拟键合线脱落的IGBT实验平台,验证表明,基于扇区内持续导通压降特征信息能更有效地表征风电变流器IGBT模块健康状态,建立的IGBT模块有效工作芯片状态评估模型是有效的。Abstract: On account of chip failure inside IGBT module because the parts of bonding wires have lifted off,an effective chip number assessment method of IGBT module of wind power converter is proposed. Firstly,considering the switching time of IGBT module for a shorter time,it is difficult to acquiring the data of on-state voltage,and the data of on-state voltage in the time of 1/6 period with continuous conduction is used. Secondly,according to the structure and output characteristic of multi-chip IGBT module,the mathematic relation is deduced between on-state voltage and IGBT chip number,and the effective chip number assessment model of IGBT module is established. Finally,based on an experiment platform of wind power converter,the effectiveness of proposed assessment method is verified by the simulated experiment.
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