Dynamic Modelling of Reversible Solid Oxide Cell for Grid Stabilisation Applications

In this work, the dynamic modelling of a system based on reversible solid oxide cell (rSOC) is developed so that it can be integrated with the grid for power balancing. The focus is on the compatibility with profiles of wind electricity production. In addition, the effect and challenges of such a dynamic operation on the system and stack itself are studied. Detailed operation strategies are defined during the switching process from one operational mode to another and are implemented on the dynamic process model. Simulation results show that when the rSOC system is operated in solid oxide electrolysis cell (SOEC) and solid oxide fuel cell (SOFC) modes alternatively, energy balancing can be continuously implemented. In this process the results show that rSOC system operates in the safe operating range and does not deviate from the system limits. This is due to the accurate strategies developed for the switching process. It is also observed from simulation results that the switching time significantly is influenced by the initial power of one operational mode and the final power of another operational mode.