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The difference between DFAX generation/load and Subsystem generation/load is that DFAX can define (while subsystem can not) participation factors, which are used to control how the generation/load are changed when performing the PV analysis. For example, machine G1 (MBASE=100) and G2 (MBASE=300) is defined as source generation, DFAX can define G1 participate as 60%, G2 as 40%, then if the generation increase is 100 MW, then G1 takes 60 MW, G2 takes 40 MW. On the other hand, subsystem generation/load options can only distribute the increase by MBASE, i.e., for the same 100 MW increase, G1 would take 25 MW ( MBASEG1/ MBASETotal * 100), G2 takes 75 MW.

The example assumes that active power limit is not enforced.