Impact of Integrating Electric Vehicles and Rooftop Solar Photovoltaic on Transformer's Aging Considering the Effect of Ambient Temperature

In this paper, the impact of plug-in electric vehicles charging demand on the distribution transformer's insulation aging in the presence of rooftop solar photovoltaic is probabilistically quantified. The monthly/seasonal variations in ambient temperature are incorporated into the thermal model used to estimate the loss-of-life of distribution transformers. Markov Chain Monte Carlo is used to probabilistically estimate the hourly loading on the transformers and hence emulating different scenarios of plug-in electric vehicles charging according to time-of-use and considering different penetrations of rooftop solar photovoltaic. The results quantifying the impact on the transformer's insulation aging due to variations in ambient temperature and plug-in electric vehicles charging according to time-of-use are discussed and conclusions are drawn.