Conventional wind power smoothing control adopts hard-coded filtering algorithms to produce smoothed power output without considering the actual system need. In this letter, we propose a novel smoothing control paradigm in context of performance-based regulation service, in which the actual balancing need is considered and formulated as an automatic generation control regulation mileage. The proposed smoothing objective is to alleviate the regulation mileage while maximize wind energy harvesting. The effectiveness of the proposed framework is demonstrated through comparable case studies, through which the simulation results suggest a high potential for practical applications.