Simple code for fitnet-question

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Anand Dandavate
Anand Dandavate 2021-5-5
The computation of real electrical power between buses 1 and 2 is given by the formula :
Preal= V1^2 * G12 -V1*V2*(G12*cos(delta12)+B12*sin(delta12))
where V1 and V2 are the voltages at buses 1,and 2, G is the conductance and B is the susceptance, delta is the phase angle between buses 1 and 2,
I am training a simple fitnet with just 5 input parameters V1,V2, G12,B12, and delta 12. The target is P real computed by above formula.
After training the net, I want to generalize. This means I am now feeding new input parameters and applying the trained net to these new parameters using the function
newoutput=net(newinput).
I am expecting the newoutput equal to the newcomputed value of Preal using the above formula with newinput parameters.
Instead, I get the newoutput exactly equal to the value of target used using the training phase. Even if I train the net multiple times, I always get the newoutput during generalization equal to the last target value used during the training phase.
What am I doing wrong? Why is the fitnet not generalizing to values of new target values for the newinput parameters?
How can I achieve my desired result?

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