i am implementing  Classical DTC in simulink with improved stator flux estimation [Algorithm which was proposed in paper AN IMPROVED STATOR FLUX ESTIMATION IN STEADY STATE OPERATION FOR DIRECT TORQUE CONTROL OF INDUCTION MACHINES  ],during this implementation i am facing problem to estimate the synchronous frequency.

As it was given in paper that

We ={ [ V - i*r] / (Si_s^2 )} .  j si_s

my doubt is that as the voltage is pulsed stepped waveform of magnitude 2/3*Vdc peak  to  peak and subtraction of i*Rs drop gives the result of emf(v-i*rs) of (2/3*Vdc) +/- 20 , and the wave form look like voltage wave form.How can we get synchronous frequency from this noisy waveform even after it has been divided with si_s^2 and it multipled with j*si_s.

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