The rapid adoption of electric vehicles has created increasing demand for reliable, efficient, and grid-compatible fast-charging infrastructure. Conventional charging systems often introduce power quality issues, voltage fluctuations, and harmonic distortion in distribution networks. Smart fast-charging systems with grid interaction control mechanisms can mitigate these challenges by regulating power flow and maintaining system stability. This study presents the design, modeling, and performance evaluation of a smart DC fast-charging system integrated with grid-side power quality control. The proposed system incorporates a bidirectional converter, power factor correction, and adaptive control strategies to manage charging demand and minimize grid disturbances. Analytical modeling and simulation-based performance evaluation were conducted to assess voltage regulation, harmonic distortion, efficiency, and load balancing characteristics. The results demonstrate improved grid compatibility and charging efficiency compared to conventional fast-charging systems.