Self-Consignment Simulation with Multi-Region EMS

Efforts toward decarbonization have been accelerating worldwide, leading to an increase in companies aiming to introduce renewable energy (RE). Due to the RE generation instability, Japan has a "self-consignment" system to share RE electricity. Systems to evaluate the return on investment of energy facilities in self-consignment have been developed; however, evaluations of cross-area self-consignment remain insufficient. This study evaluates investment recovery, imbalance, and 24/7 CFE achievement rate through simulations of cross-area self-consignment using a Multi-Region Energy Management System (EMS). The investment recovery simulation confirmed the profit and loss of introducing photovoltaic (PV) systems and Battery Energy Storage Systems (BESS), revealing that when the BESS capacity is 50% of the PV capacity, the result is close to the break-even point. Additionally, the online simulation assessed the imbalance reduction effect of BESS, showing that when the BESS capacity is 50% of the PV capacity, the occurrence of imbalances is suppressed to about once a day for certain amounts of PV installation. Furthermore, the study investigated the profit and loss, imbalance, and 24/7 CFE achievement rate when the BESS capacity is fixed at 50% of the PV capacity. In this situation, the optimal PV capacity for maximum profit is 5MW, while the 24/7 CFE achievement rate improves with increased PV capacity.