The Grid Code Specifications for Grid Energy Storage Systems are determined according to Table 3.1, and as a rule, they are not dependent on the rated capacities or specifications of other production or demand systems connected to the same connection point.
If the technical execution of a grid energy storage system connection requires specific studies, the grid energy storage system owner shall conduct the studies in co-operation with Fingrid and the relevant network operator no later than during the planning stage of the grid energy storage system grid connection.
Grid energy storage system: A unit or an economic ensemble of units capable of storing electricity, which is connected to the network through power electronics, and which also has a single connection point to a transmission system, distribution system, closed distribution system, HVDC system or a real property’s electricity network.
The grid energy storage system owner shall inform Fingrid and the relevant network operator of the contact information of the operator responsible for the operation of the grid energy storage system, no later than when the grid energy storage system begins to supply active power to Finland’s power system.
When the grid energy storage system achieves an operating point where no active power is transferred between the grid energy storage system and the power system, the grid energy storage system must be able to continue its operations at that level until frequency is back to a level of over 49.5 Hz (see Figure 11.4).
The grid energy storage system must be equipped with a bus interface (input port), so that the production mode of active power can be changed (production/demand) and a setpoint can be given thereto. The bus interface must be compatible with the IEC 60870-6 (Elcom, ICCP/TASE.2), IEC 60870-5-104 or IEC 61850 protocols.