Problem about power_pss (bode)

Hi. Everyone.

I try to used simulink to simulate about PSS , but I want to know which measured point(Input and Output) make the bode plot same with the plot in the EXAMPLE(power_pss).

Thank you.

Answer 1

[SinanB]

I am guessing you can get the same result by doing the followings:

1. disable the fault and the breakers as mentioned in the example
2. put 'open-input' analysis point at 'Vref' line
3. put 'open-output' analysis point at 'Pa' line
4. linearize it at a steady state point such as 0.99s (just before manual perturbation kicks in)
5. in the linearization window, click on bode plot (and obtain 'linsys1')
6. Note that the oscillation frequencies can be extracted by doing either:

imag(eig(linsys1.A))/2/pi

or

[wn zeta poles] = damp(linsys1);
imag(poles)/2/pi