Hydrogen Energy System Planning Framework for Unified Energy System

Unified energy system should consider the impact of the randomness of new energy on the reliability of the unified energy system, use multi-energy complementary and seasonal energy storage technology to improve energy efficiency, and ensure reliable supply of electricity/heat/gas/oil chemical products on medium and long-term scales. Firstly, the basic structure of the hydrogen energy system which include power to hydrogen (P2H)-hydrogen storage (HES)-hydrogen to X (H2X) and its operating modes supporting the unified energy system were proposed. Then, the seasonal hydrogen storage planning framework was proposed, which mainly analyzed the key characteristics of seasonal hydrogen storage, established its operation analysis and energy regulation models. A complementary energy storage mechanism for the different energy storage functions requirements in unified energy system was developed, which took the upper limit of the short-term energy storage adjustment time as the time resolution of seasonal energy storage energy adjustment. Based on it, the configuration method of seasonal hydrogen storage system was proposed to ensure that the system has no long-term energy insufficient after seasonal hydrogen storage configuration, furthermore conducting a comprehensive evaluation of the seasonal hydrogen storage planning scheme. Finally, in the context of a unified energy system, the effectiveness of the proposed seasonal hydrogen storage planning method was verified. © 2022 Chin. Soc. for Elec. Eng.