Patent ID: 11913986
Assignee: WUHAN UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A reliability evaluation method for an insulated gate bipolar transistors (IGBT) of a microgrid inverter of a microgrid based on segmented long short-term memory (LSTM), comprising following steps executing by a processor:
step 1 of performing an operation of the microgrid and constructing an electrothermal coupling model for a microgrid inverter topology and an IGBT type;
step 2 of introducing a machine learning algorithm into an IGBT aging prediction and obtaining a segmented LSTM prediction network for aging characteristics of the IGBT;
step 3 of using a monitoring value of an IGBT aging parameter to perform a segmented LSTM prediction, obtaining a predicted aging process, and performing an aging correction on parameters of the electrothermal coupling model to ensure accuracy of junction temperature data, wherein, the IGBT aging parameter comprises an IGBT collector-emitter turn-off impulse voltage;
step 4 of using a rainflow-counting algorithm to process junction temperature data output by the electrothermal coupling model corrected based on a segmented LSTM prediction result and calculating real-time thermal stress load distribution of the IGBT;
step 5 of combining a fatigue damage theory and a Lesit life prediction model and calculating real-time cumulative damage and predicted life of the IGBT;
step 6: employing a physical IGBT power module in a power system of the microgrid; and
step 7: modifying the operation of the microgrid and a modifying a performance of the physical IGBT power module based on the real-time cumulative damage and predicted life of the IGBT.