Grigorios Fousekis’s scientific contributions

The adoption of electric vehicles (EVs) has emerged as a significant measure to reduce greenhouse gas emissions and promote cleaner transportation towards the goal of decreasing temperature increase over 0.5°C by 2050. The evolution of battery technology allows for massive exploitation of EVs as they require low maintenance and have over 200% higher efficiency in total than conventional vehicles. However, the need for rapid implementation of charging stations poses unique challenges for electrical distribution networks. This paper investigates the influence of electric vehicle (EV) charging stations on the electricity utility grid, focusing on their technological frameworks. The capabilities and challenges of lithium-ion battery technologies are examined, including their high energy density and reliability, while addressing concerns over performance limitations due to aging cause by high temperatures. The work outlines current charging technologies, classifying them into AC and DC wired systems, wireless charging methods, and battery exchange systems. Rapid advancements have reduced charging times to 10-15 minutes for 80% capacity using high-voltage systems. Furthermore, the integration of Vehicle-to-Grid (V2G) systems, where the EV as an separate energy storage system exchanges power with the utility grid, was found to reduce peak load by over 4% and improve energy efficiency, lowering energy costs by 40% and scheduling costs by 14%. V2G technology enables real-time bidirectional energy transfer, supporting grid stability and sustainability. Challenges such as communication reliability, data privacy, and battery degradation due to increased charging cycles were discussed. The study concludes that the adoption of EVs and their integration with utility grids through V2G systems presents a promising approach to enhance sustainability, although overcoming technical challenges and optimizing battery life are crucial for widespread implementation. The findings emphasize the pivotal role of aggregators in managing power exchanges, predicting load fluctuations, and ensuring a reliable energy supply.