Modeling and Robust Optimal Dispatch of Rural Integrated Energy System Considering PV-Hydrogen-Methane Energy Storage Characteristics

This paper aims to investigate the dispatch role played by renewable energy hydrogen production and biogas fermentation in the rural integrated energy system. Firstly, based on the biogas fermentation kinetics model and thermal load characteristics, we constructed an electricity-heat-cold-gas integrated energy system model, which consists of PV hydrogen production, combined heat and power generation, biogas fermentation and energy storage. Then, we established a two stage robust optimization based day-ahead dispatch model with the goal of minimizing daily operation cost, and obtained the day-ahead dispatch plan under the worst scenario by solving the model with column-and-constraint generation (C&CG) algorithm. Moreover, we finished the intra-day dispatch in light of short-term forecasting value of PV power and electric load, realizing the stable and economic operation of the integrated energy system. Finally, a case study was conducted on a rural agricultural park integrated energy system, which indicates that the PV hydrogen production and biogas fermentation have energy storage characteristics and can make contributions to alleviate “source-load” uncertainty, and are proved to have a certain economic value.