Should one of the GTGs operate in the DLN mode, it is no longer possible to have identical load sharing among the machines since it is necessary to ensure that the DLN machine operate far from its DLN limit. Secondary regulation is used to prevent operation close to the DLN limit. This is achieved by considering two different values of minimum output for the DLN turbine. At low load the DLN turbine minimum output limit will be set in the PMS to a relatively small percentage of the turbine's nominal rating. Operation of the DLN turbine can then be at the same % output as all other GTGs and STGs since at light load the output will be far below the DLN limit shown in Fig. 5. When the plant load is high however, the DLN turbine must be set to operate well above the DLN limit. In this case the minimum output limit set in the PMS is the DLN limit based on the curves of Fig. 5. Secondary regulation will ensure that the % load within this new range (DLN limit to maximum output) is the same as the % load of all other GTGs, their range however, being between ≅0 and Pmax. This is shown in Fig. 6.