Abstract: To address the power coordination challenges in industrial terminal distribution systems under the “No Surplus Power to Grid” Mode, this paper proposes a multi-timescale active power optimization strategy. The coupling characteristics of factory generation-load-storage systems and the constraints of local PV consumption are analyzed. Based on this analysis, an optimization model incorporating PV curtailment, energy storage regulation, and flexible load response is developed. The control strategy divides the time domain into second-level, minute-level, and hour-level scales, implementing rapid disturbance suppression, short-term predictive dispatch, and intra-day energy guidance respectively, while establishing a cross-timescale coordination framework. Field validation in a typical industrial park demonstrates that the strategy reduces PV curtailment by 78.5% and increases PV utilization to 93.4%, significantly improving system balance and stability.