Module 9 : Numerical Relaying II : DSP Perspective

Lecture 35 : Computation of Phasor from Discrete Fourier Transform

35.2 Phase Computation using DFT (contd..)
 

Similarly,

     
     
     
     
 

Hence, DFT estimated at window for (m = 1) is given by

 

  Hence, phasor estimate for window is given by
 


 
 
 

Thus, we see that with moving window, the phasor estimate rotates at a speed of per window. This rotation in phasor during computation can be directly derived from DFT – phase shifting property.

   
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