METHOD FOR DETERMINING AN ELECTRIC ENERGY STORAGE SYSTEM STATE-OF-POWER VALUE

A method for determining an electric energy storage system state-of-power value. The method includes for each battery unit in the electric energy storage system, determining the battery unit state-of-power value, the battery unit state-of-power value being indicative of the maximum amount of electric load that the battery unit can deliver or receive at a constant load level during the predetermined future time range without violating electro-thermal limits of the battery unit, for each battery unit in the electric energy storage system, obtaining a battery unit measured load value indicative of the electric load actually imparted on the battery unit at a certain time instant, on the basis of the battery unit measured load value for each battery unit in the electric energy storage system, determining a load distribution amongst the battery units of the electric energy storage system, and determining the electric energy storage system state-of-power value on the basis of the battery unit state-of-power values and on the load distribution.