abc to dq transformation

Hi

Iam working on dynamic model for induction generator I stuck on the trasformation part from abc to dq referance frame.

in matlab block there is wt input signal. but i relay i do not jknow what this value should be or how we can optin it.

[Zakaria Bouzid]

connect to the second input a vectorized signal containing the [sin(ωt) cos(ωt)] values, where ω is the rotation speed of the reference frame.

@abdelaziz

Answer 1

[Walter Roberson]

wt: The angular position of the dq rotating frame, in radians.

https://www.mathworks.com/help/physmod/sps/powersys/ref/abctodq0dq0toabc.html

[Ahmad Badran]

yes I know, but I dont know how it can be calculated it of define

[Walter Roberson]

If you have a fixed angular rotation rate, ω then

If you do not have a fixed angular rotation rate, then you would use other calculations to figure out what the current rotation angle is.

[Ahmad Badran]

How this can be decided, in my case the induction generator is conected to the strong grid with fixed frequency and voltage

[Walter Roberson]

Are you modeling constant-rate rotation or variable-rate rotation? If you are modeling variable-rate rotation, then is the rotation angle to be the current value of some signal, or is it to be the accumulated value of some signal? For example, is the rotation angle to be proportional to the total current that has flowed over some particular signal?

If the rotation rate is not constant, then are you modeling a system with friction? Is the friction non-linear?