Eh? 0-d-q system
Eh? 0-d-q system
(OP)
Can anybody introduce myself to the joys of Parks Transformation, given that i have induction machine parmeters in both physical and per unit sense. This is first time i have encountered it ,as a new package has been brought in.
How does the physical parameters relate to the matrices given in various texts, absoulutely bamboozled?, as no texts gives examples on how it is carried out.
Any help from the experts out there would be very appreciated.
How does the physical parameters relate to the matrices given in various texts, absoulutely bamboozled?, as no texts gives examples on how it is carried out.
Any help from the experts out there would be very appreciated.






RE: Eh? 0-d-q system
RE: Eh? 0-d-q system
RE: Eh? 0-d-q system
1) the assumption of synchronous rotation of rotor fluxes is not valid with induction machines
2) the power of an induction machine is usually defined as a function of the slip (from the torque-speed curve) and not from derivation of the rotor angle (delta) relative to the stator - i.e the position of the d-axis.
Are you considering motor or generator studies ?
RE: Eh? 0-d-q system
Stator page
Specify resistance and inductance in Park transformed
quantities (d- q- and 0- system).
NB! All inductances in H or pu.
Rotor page
The total number of coils are listed and
given data on the Rotor page. First the the
d-axis coils then the q-axis coils.
Specify resistance and inductance for each coil.
All the coils are short circuited.
NB! All inductances in H or pu.
Due to the large sizes of the motors ( highest 13.1MW) involved they should play a significant factor in the fault level dynamics.Im just totally stuck on how to proceed.
Thanks for getting back to me.
RE: Eh? 0-d-q system
Although the purpose of the program is a bit different, it might give an idea, how the ordinary parameters should be used in ATP or ATPdraw.
RE: Eh? 0-d-q system
Cheers!
RE: Eh? 0-d-q system
http://www.p-e-s.spb.ru/downloads/docs/S...
etc. for more info
R.H. Park introduced a new theory in 1920s for electric machine analysis to convert three-phase machine to two-phase machine using resolution into d-q axis plane.
d-q variables are associated with fictitious machine rotating windings with rotor at synchronous speed.
RE: Eh? 0-d-q system
Can you list the data for one motor, to start with?
RE: Eh? 0-d-q system
Does this help?
Many Thanks
RE: Eh? 0-d-q system
RE: Eh? 0-d-q system
(my guess is per unit)
Voltage ?
RE: Eh? 0-d-q system
RE: Eh? 0-d-q system
RE: Eh? 0-d-q system
Ra = armature resistance
La = armature (leakage) inductance
Lm = magnetization inductance
But R1, R2, L2 ?
R1 might be a starting resistance.
(Please correct me, if necessary)
R2, L2 cannot be rotor resistance and inductance, because they are zero. But because they are zero, they can be neglected (!?).
But that means that the rotor data is not given. When the rotor data is not given, the conventional guess is that the rotor resistance and inductance (as seen from the stator side) are the same as the stator resistance and inductance.
Rr' = Ra and Lr' = La
The instructions for the induction motor in ATP and ATPdraw are confusing. I have found the following to work well with the universal motor 3 model (UM3):
General:
stator coupling Y
Pole pairs 1
Rotor coils d:1 q:1
Magnet:
LMUD = LMUQ = Lm (put the magnetization inductance here)
Stator:
R(0) = 0
R(d) = R(q) = Ra ( put the stator resistance here)
L(0) = 0
L(d) = L(q) = La (put the stator inductance here, in H)
Rotor:
Use same values as for the stator
That is, do not care about the Park's transformation !
By the way, the induction motor is a tricky component in ATP. There must be some component between a source and the induction motor. A switch or a small impedance can be used.
If there are several motors in the same network, there must be a piece of transmission line connecting the motors to the network. The delay of the line must be longer than the time step, so that the line (in a way) isolates the motors from the network.
You can download a simple ATPdraw example of a network with an indcution motor at http://pp.kpnet.fi/ijl/prog.htm
Your data has been used in the model, but note, the rotating speed is constant.
RE: Eh? 0-d-q system
Thanks for your no doubt valuable time.
Michael
RE: Eh? 0-d-q system
Many Thanks
RE: Eh? 0-d-q system
RE: Eh? 0-d-q system