基于数字孪生的风电变流器IGBT衰退热特性评估方法研究OA

Insulated gate bipolar transistor(IGBT)as an important part of wind power converter,through the high frequency switch to achieve efficient conversion of electrical energy,its long-term complex operation will lead to IGBT performance decline,increase the risk of failure and affect the stability of the system.By analyzing the change trend of junction temperature of IGBT after decay,the decay degree of IGBT in wind power converters in different years of actual operation was tested.PLECS module was used to build IGBT thermal simulation model for doubly-fed wind turbine application scenarios to study the junction temperature characteristics of IGBT under different working conditions.The IGBT thermal model was modified according to the measured decay data.In addition,according to the difference of junction temperature characteristics before and after IGBT recession,the digital twin model framework was established,and the whole process from model establishment to real-time monitoring of IGBT recession degree was designed,and the real-time monitoring of IGBT recession degree was finally realized.