Reliability analysis of power converters in hybrid transformers considering the common fault conditions

Purpose With the high penetration of distributed generators and the integration of large-scale emerging power sources and loads such as electric vehicles, Hybrid Distribution Transformers (HDTS) offer significant advantages in terms of flexible regulation and power quality improvement. However, due to high operating loads and the complex electrical environments frequently encountered during operation, these devices are prone to various faults such as overheating and breakdown. Despite their critical role, research on the reliability of hybrid distribution transformers has been lacking in recent years, posing significant challenges to the safety assessment of system operation. To address this gap, this paper investigates the electro-thermal stresses on components within HDTs under common extreme fault conditions. By considering ambient temperature conditions and overall structural imbalances, a lifetime analysis of both components and the system is conducted. Design/methodology/approach This paper investigates the electro-thermal stress on various components within HDTs under common fault conditions. Findings A lifespan evaluation of both the components and the system is conducted, considering the temperature conditions in both coastal and inland regions. Originality/value This paper conducts a lifetime evaluation study of key components in HDTs.