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Abstract: The rapid proliferation of electric vehicles (EVs) and large-scale distributed energy resources (DERs), such as solar photovoltaics, wind generation, and energy storage systems, has introduced significant challenges and opportunities in modern power systems. This study presents an optimal energy hub dispatch and distribution network operation framework that efficiently coordinates multi-energy sources, loads, and EV charging demands under high DER penetration. The proposed approach integrates advanced optimization techniques to minimize operational cost, energy losses, and carbon emissions while maintaining system reliability and voltage stability. It incorporates dynamic EV charging behavior, bidirectional power flow, and real-time demand response within the energy hub structure. Furthermore, the model addresses uncertainties associated with renewable generation and EV mobility through robust or stochastic optimization strategies. Simulation results demonstrate that the coordinated operation of energy hubs and distribution networks significantly enhances energy efficiency, reduces peak load stress, and supports sustainable grid operation, making it a promising solution for future smart grid and electrified transportation systems.