The development of carbon-green certificate market trading mechanisms is a critical measure for advancing the green and low-carbon transformation of energy systems. In existing optimal resource capacity allocation studies for industrial parks, the impacts of such trading mechanisms and the flexible response of electrolytic aluminum loads are neglected, which compromises the economic efficiency and applicability of wind-photovoltaic-energy storage configuration schemes. To address this gap, an optimal Wind-PV-ESS capacity allocation method for industrial parks considering the above two factors is proposed. First, a demand response model for flexible electrolytic aluminum loads is established based on their production energy demand and regulation characteristics. Second, a ladder-type carbon-green certificate trading mechanism is investigated to support energy conservation and carbon reduction in these parks. Then, an integrated capacity allocation and scheduling model is constructed, with the park ' s annualized investment-operation cost as the objective and constraints on equipment investment, site availability, and operation fully considered. Finally, it is demonstrated through case studies that the proposed method effectively reduces annualized costs, achieves efficient new energy utilization, and lowers carbon emissions simultaneously.