Power Configuration-Based Life Prediction Study of IGBTs in Energy Storage Converters

An energy storage converter system consists of an energy storage medium and bi-directional converter, and IGBT is the core device of an energy storage bi-directional converter. The lifetime of an IGBT is closely related to the operating conditions of the system, and how to extract the characteristics of the IGBT of an energy storage converter during the actual operation is one of the most critical issues in the lifetime prediction. Firstly, the characteristics of IGBT electrical and thermal parameters under specific operating conditions are analyzed based on the power allocation results of the energy storage system. Then, by building a simulation model of the energy storage system, the power changes of the system are converted into the changes of electrical parameters such as voltage, current, and drive signal of IGBT devices, and then into the changes of the junction temperature of the devices, and finally, based on the analytical life model, the service life of the devices is analyzed.