This model demonstrates both ways of implementing a time-varying load.
The model is similar to OneBusImpedanceOneLoad, except that the active power P of the load is increased from 10 MW to 20 MW at time = 1 and the reactive power is increased from 0 to 30 MW at time = 2.Both ways of implementing a variable load, with the expression in the modifier and with the input signals, are demonstrated. The results are exactly the same.