基于曲线离散Fréchet距离的风电并网变流器中IGBT模块缺陷诊断方法  

Defect diagnosis based on discrete Fréchet distance of curves for IGBT module used in grid-connected converter of wind power

作　　者：周生奇[1] 周雒维[1] 孙鹏菊[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电力自动化设备》2013年第2期8-13,共6页Electric Power Automation Equipment

基　　金：国际科技合作计划资助项目(2010DFA72250);国家自然科学基金资助项目(51077137);国家自然科学基金重点资助项目(51137006)~~

摘　　要：提出一种基于门极电压响应曲线Fréchet距离变化的绝缘栅双极型晶体管(IGBT)模块缺陷诊断方法。在IGBT模块的失效过程中,部分门极杂散参数会发生变化,相应地门极电路的电压响应曲线也会发生变化。利用门极电压在开通时段响应曲线的离散Fréchet距离度量其相似性的变化,并以此作为参数辨识IGBT模块是否存在缺陷。与现有的故障诊断方法相比,其响应时间更充裕。针对典型的缺陷形式进行了实验研究,结果验证了该方法诊断结论的正确性。A method based on the change of Fréchet distance of IGBT gate voltage curves is proposed to detect the early defects of IGBT modules. During the process of module failure,parts of gate stray parameters may change,which is accordingly reflected by the change of voltage response curves of the gate circuit. The Fréchet distances of gate voltage curves during the switch-on period are used and the deviation of their similarity is detected by comparing the distances among different stages ,based on which,the detects of IGBT module are identified. Compared with the existing diagnosis method,it gives much longer time for repair or replacement. Experiments are carried out for typical defects and its validity is verified.

关 键 词：风电 并网 变流器 绝缘栅双极型晶体管 Fréchet距离 

分 类 号：TM614[电气工程—电力系统及自动化] TM46