The increasing integration of clustered electric vehicles (EVs) and intermittent renewable energy sources (RES) into power systems presents significant operational challenges to smart grids, notably heightened load fluctuations and reduced grid stability. This paper proposes an intelligent charging-discharging optimization model for EV clusters by leveraging their dual load-storage and spatial transfer characteristics, with EV aggregators (EVAs) acting as the coordinating entity. The model incorporates dynamic electricity pricing, the stochastic nature of RES, the temporal coupling of EV charging constraints, and battery aging effects. To address this stochastic optimization problem, a model-free reinforcement learning-based approximate state Q-learning algorithm is proposed. Through environmental interactions and reward feedback mechanisms, this algorithm enables EVAs to intelligently control the charging and discharging behaviors of EV clusters to dynamically respond to real-time electricity price fluctuations and RES output uncertainties, and ultimately mitigate operational stress on the power grid. While ensuring that the charging demands of EV owners are met, the proposed method achieves coordinated operation among the smart grid, EVAs, and end-users through optimized power scheduling strategies. Finally, comparative experiments with existing algorithms verify that the proposed method has significant advantages in reducing the charging costs of EV users and improving the operational profits of EVAs. Simulation results demonstrate that the proposed algorithm exhibits superior performance: under this algorithm, the monthly service profit of the EVA increases by 9.68 % compared with the unidirectional scheduling algorithm and by 22.97 % compared with the greedy algorithm.
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