Experimental Study on Adaptability of Fully-immersed Liquid Cooling IGBT Module

Abstract

IGBT converter valve is the core component of the flexible HVDC transmission system, and the failure caused by the thermal problem and the decrease of equipment reliability become the bottleneck of the development of flexible HVDC transmission technology toward large capacity. It is experimentally proved to be an effective way to reduce the junction temperature of IGBT module by using the fully-immersed liquid cooling technology. In this paper, the operation reliability of IGBT module immersed in the liquid cooling medium is studied by carrying out the adaptability experiment of fully-immersed liquid cooling IGBT module. The operation process of fully-immersed liquid cooling IGBT module is monitored, and the research methods of signal observation and energy spectrum analysis are used to diagnose the failed IGBT module in the experiment. The failure mode and cause of the fully-immersed liquid cooling IGBT module are obtained, which provides guidance and technical support for the optimal design of high reliability fully-immersed liquid cooling IGBT module.