Hi,...

You can type " transformations" in matlab/simulink, there is useful blocks to transfer from abc to alpha-beta,d-q,... .But by using this block should be careful about  '' wt'' input. in addition you can transfer from abc to d-q,... using  klark transformation matrice.

best regards

A.Younesi

tank you dear Aria

but i dont know how should i use it just in synchronous reference frame?

for example, my thesis is about FOC(field oriented control) i have a feedback from tetha to make SIN and COS and use in abc to dq transformation,as we know,in the output i should have a DC wave form but there is sin wave

Best wishes

There is one program about DQ transformation, you can find that on google very easily

Hi,..

You should be careful that you work in which reference frame( rotor  or stator), so feedback of theta is theta_stator(field_angle) or is the theta_rotor, in the second case you should be careful that the theta has measured is mechanical or electrical.

If you need more, you can send me your file. ( [email protected])

I will try to solve your problem. 

Best regards.

A.younesi

dear friends muhammad saleem & aria yunesi

tanks for your guidance, my problem was solved

tank you alot

i wish best for you

The Following References may be gone through.

1.   abc-dq Transformation

Asked by Ayesha on 30 Dec 2011

Hi I am currently doing a project on boost type PWM rectifiers,i have to do a simulation of my ckt in dis regard. As i m a new user of MATLAB- simulink i need help! pls can anyone give me example for performing abc-dq transforamtion in simulink? i dnt understand how to give inputs. there are 3 phases and oly one parameter stating abc, how do i connect the other inputs.. pls enlighten me on this.

Answer by Ravikrishna sivakumar on 30 Dec 2011

use mux block to multiplex your currents then give it to abc of the abcto dq converter..use discrete virtual pll block to generate sincos and connect to sin_cos block..

Link: http://www.mathworks.com/matlabcentral/answers/24988-abc-dq-transformation

2.    abc_to_dq0 Transformation

The Transformations section of the Control and Measurements library contains the abc to dq0 block. This is an improved version of the abc_to_dq0 Transformation block. The new block features a mechanism that eliminates duplicate continuous and discrete versions of the same block by basing the block configuration on the simulation mode. If your legacy models contain the abc_to_dq0 Transformation block, they will continue to work. However, for best performance, use the abc to dq0 block in your new models.

Link: http://in.mathworks.com/help/physmod/sps/powersys/ref/abc_to_dq0transformation.html

3.    dq0_to_abc Transformation

The abc_to_dq0 Transformation block computes the direct axis, quadratic axis, and zero sequence quantities in a two-axis rotating reference frame for a three-phase sinusoidal signal.

The Transformations section of the Control and Measurements library contains the dq0 to abc to block. This is an improved version of the dq0_to_abc Transformation block. The new block features a mechanism that eliminates duplicate continuous and discrete versions of the same block by basing the block configuration on the simulation mode. If your legacy models contain the dq0_to_abc Transformation block, they will continue to work. However, for best performance, use the dq0 to abc block in your new models.

Link: http://au.mathworks.com/help/physmod/sps/powersys/ref/dq0_to_abctransformation.html?nocookie=true&s_tid=gn_loc_drop

P.S.

Mr Pisupati Sadasiva Subramanyam 

thank you for your complete and helpful guidance 

Best regards

Use only the transformation équations with respect to the synchronous angle

How to convert abc to alpha beta and from alpha beta to dq  using MATLAB?

Please refer to following attachment.

http://www.mathworks.com/matlabcentral/fileexchange/36547-abc-to-alpha-beeta-to-dq-and-dq-to-alpha-beeta-to-abcconvertion

Thank you..

Dear Aria Younesi ,

Why you said that you should be careful about wt input. I