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I understand that iterations would be necessary to adjust results of a simulation. The chiller IPLV can be changed by adjusting the chiller performance curves. Others have done this in a spreadsheet prior to the simulation. If you are using the simulation to determine the IPLV for the current performance curves then you can minimize the time a simulation takes by performing only a design day simulation and use a 1 hour time step. The calculation of IPLV does not need an annual simulation. Use only 1 SizingPeriod:DesignDay to speed up the simulation time.

Timestep,1;

SimulationControl,
  Yes,                     !- Do Zone Sizing Calculation
  Yes,                     !- Do System Sizing Calculation
  Yes,                     !- Do Plant Sizing Calculation
  Yes,                     !- Run Simulation for Sizing Periods
  No;                      !- Run Simulation for Weather File Run Periods