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Converting renewable energy into ammonia has been recognized as a promisingway to realize ``green hydrogen substitution" in the chemical industry.However, renewable power to ammonia (RePtA) requires an essential investment infacilities to provide a buffer against the strong volatility of renewableenergy and the limited flexibility of ammonia synthesis, which involves thethree main stakeholders, namely, power, hydrogen, and ammonia. Therefore, thesizing and pricing of RePtA play a core role in balancing the interest demandsof investors. This paper proposes an optimal sizing and pricing method forRePtA system planning. First, power to ammonia (P2A) is modeled as a flexibleload, especially considering the limited flexibility of ammonia synthesis,which has been verified using real dynamic regulation data. Second, themulti-investor economic (MIE) model is established considering both externaland internal trading modes. Then, a two-stage decomposed sizing and pricingmethod is proposed to solve the problem caused by the strong coupling ofplanning, operation, and trading, and information gap decision theory (IGDT)method is utilized to handle the uncertainty of renewable generation. Finally,real data from a real-life system in Inner Mongolia are utilized to verify theproposed approach. The results show that the system proposed has a yield of8.15%.

Optimal Sizing and Pricing of Renewable Power to Ammonia Systems Considering the Limited Flexibility of Ammonia Synthesis