CO2 Emission Assessment of the Provision of Ancillary Services by Hydrogen Storage Power Plants

To guarantee power system stability, system operators in Germany adopt measures such as ancillary services. At present, these are primarily provided by conventional power plants, which results in high CO
₂
emissions. To meet this challenge, renewable energy plants are being expanded. Since the wind and PV systems are connected to the grid via converters, the flywheel mass in the grid decreases continuously. This contribution presents an approach to provide ancillary services by hydrogen storage power plants, which can replace large power plants with their flywheel masses and at the same time significantly reduce the amount of CO
₂
emitted. Therefore, a method is developed, which calculates the specific carbon dioxide emissions through ancillary services. The focus of the investigations is how hydrogen storage power plants enable low-CO
₂
provision of balancing power and how they contribute to CO
₂
-reduced power system restoration. The evaluation is carried out on basis of a generic medium-term model.