The UK's G100 requirements have shifted from power-based to current-based limits for grid export control. This change means that export limitation is now defined by the maximum current that can be exported to the grid, rather than the maximum power output.
This current-based approach provides more precise control and better alignment with the physical constraints of the electrical infrastructure, as current is directly related to thermal limits of cables and equipment.
A key aspect of the current-based requirements is that limits must be applied on a per-phase basis. This means that each phase of a three-phase system must be individually monitored and controlled to ensure it doesn't exceed its specified current limit. This granular approach provides better protection for the grid infrastructure and more accurate compliance with local network constraints.