Method for controlling charging of electrical storage devices

A method for controlling charging of at least one electrical storage device, the method comprising:

• providing an aggregator arranged in communicative connection with a power grid and the at least one electrical storage device;
• the aggregator retrieving information regarding the power grid and the at least one electrical storage device;
• the aggregator deriving a weighted distribution of virtual inertia response and fast frequency response to be provided to the power grid by the electrical storage devices, on the basis of the retrieved information;
• the aggregator providing the derived weighted distribution of virtual inertia response and fast frequency response to a charging controller;
• the charging controller deriving a total power available for charging the at least one electrical storage device, in accordance with the weighted distribution;
• deriving an active power setpoint for each of the at least one electrical storage device on the basis of the total available power, and on the basis of the information regarding the at least one electrical storage device;
• and
• controlling a charging state of each of the at least one electrical storage device based on the derived active power setpoint.