Difference between PU and SI Synchronous machine

[ths1104 Stenkhiste]

I use the SimPowerSystem toolbox. I am interested in the difference between :
- Synchronous machine pu fundamental
- Synchronous machine SI fundamental

I KNOW that "These two blocks simulate exactly the same simplified synchronous machine model; the only difference is the way of entering the parameter units."

For computation, it means that
1) The SI values are converted into pu values and the same block implementation is used for both machines

OR
2) The block implementation is different.

If 1) is true, I couldn't find the conversion block/routine.

If 2) is true, an immediate way to ascertain if the machine equations or their Simulink block representation are expressed in a pu system form is to examine the time difference operator. When the derivative or the corresponding integrator block is multiplied bu the base frequency wo, the pu formulation is being used. Nevertheless when looking under the masks, I couldn't find any difference between the block implementations of the pu machine and the SI machine.

Do anyone knows where is coded the difference between the pu and the SI Synchronous machine ?

[Frank W.]

"ths1104 Stenkhiste" <ths...@gmail.com> wrote in message <ib8tra$9m5$1...@fred.mathworks.com>...

If you look at the mask ('View Mask') you will find the function call of 'powericon' twice in the 'Initialization' tab of the mask editor. The calculations must be carried out by this function. I am pretty sure this function only exists as p-code.

[ths1104 Stenkhiste]

Thanks for pointing out the Mask Initialization tab. Between the pu and the SI machines, different functions are called during the initialization, the same Simulink implementation is then used for both models.

You were right, the function called during initialization are coded in a .p file...

Thank you!