• • The proposed SOH-based rotational strategy reduces power switching frequency during the 22:00–24:00 high-fluctuation period compared to power equalization, directly mitigating thermal cycling fatigue and extending electrolyzer stack lifespan—a critical economic factor given that stack replacement constitutes approximately 40% of total system capital expenditure.
• • Units operating at optimal power points achieve a system-wide hydrogen production efficiency improvement, with the proposed strategy maintaining the highest efficiency across all time periods versus chain allocation and power equalization, translating to reduced specific energy consumption per kilogram of hydrogen produced.
• • The three-stage operational strategy enables dynamic optimization of unit power modes, significantly increasing the time proportion of units operating at optimal power states (0.018 pu optimal threshold versus 0.03 pu fixed threshold), thereby minimizing efficiency losses from part-load operation.
• • The bi-level optimization framework achieves coordinated absorption of renewable power fluctuations through electrolytic hydrogen production and chemical energy storage, with the multi-stack system demonstrating reduced startup/shutdown frequency and stable operation under real-world Jibei Power Grid conditions.