In order to achieve green development, the nearby consumption of renewable energy has become the future development trend of the electrified railway traction power supply system. How to overcome the problems of small power grid coverage and single power supply mode along the western power grid is a major challenge to promote railway construction. Photovoltaic power generation has high reserves and mature technology. Combined with energy storage, it can be widely used in railway traction power supply systems to reduce the damage to transformers caused by overload operation, reduce the installed capacity of traction transformers, and extend the service life of transformers to a certain extent. In this paper, a comprehensive energy power supply system model is established first, and then combined with the transformer hot spot temperature calculation model and the life loss calculation model, the influence of the photovoltaic connection on the aging speed of the transformer is obtained.
 

PV POWER,BACK-TO-BACK PHOTOVOLTAIC POWER GENERATION SYSTEM,TRACTION POWER SUPPLY SYSTEM,TRANSFORM TEMPERATURE RISE MODELING,TRANSFORMER AGEING