Bobby Shott
New member
Hello all,
I am working on a transient stability analysis project of DFIG and I am trying to use direct method. However, all the DFIG models I have come across all the dynamic equations expressed in the dq-axis. I have being trying without success to change to a line/phase voltage expression by simply applying the inverse transformation matrix. The problem I have is with the angles. Example I know Vds=(Vms)Sinwst and Vdr=(Vmr)sinwrt, but I don't know exactly what wst will be if i want to express it as a steady state value, because in synchronous machines the resulting steady state value becomes Vds=Vms(-Sin(delta)). I don't know if I have been very clear but I just want an equation for Vds, Vdr, Vqs and Vqr which are not time dependent and are interms of Vms and a trigonometric function of an angle.
Thank you
I am working on a transient stability analysis project of DFIG and I am trying to use direct method. However, all the DFIG models I have come across all the dynamic equations expressed in the dq-axis. I have being trying without success to change to a line/phase voltage expression by simply applying the inverse transformation matrix. The problem I have is with the angles. Example I know Vds=(Vms)Sinwst and Vdr=(Vmr)sinwrt, but I don't know exactly what wst will be if i want to express it as a steady state value, because in synchronous machines the resulting steady state value becomes Vds=Vms(-Sin(delta)). I don't know if I have been very clear but I just want an equation for Vds, Vdr, Vqs and Vqr which are not time dependent and are interms of Vms and a trigonometric function of an angle.
Thank you