how can i change the input and output which in per unit (pu) to others unit

 i have making simulation design which about small hydro power plant. The simulation is involve the pid, penstock and turbine, exciter subsystem and synchronous machine pu standard. i have run this simulation and put the different value of reference speed(pu) and different value of reference value of stator terminal voltage.as we know value per unit must not exceed 1. so the output value which i get is mechanical power(pm) are same. is there any way can i change the input value in per unit to other unit. 
im investigate on how to generate the power using pressure of water which flow into turbine. hope sir can answer my problem.tq

[rasool alturfi]

I think you can get PU measured values or standard values depending on measurement instrument adjustment, as example in 3phase V-I measurement you can pick to measure in PU or just leave the ticking square empty you will get the actual values.