symbolic dynamic models for highly varying power system loads

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RT-E04: To implement the proposed algorithm for power conditioning
application, the fundamental component of historical current data was filtered out by
performing fast Fourier transform. Subtracting this component from the predicted current,
unwanted harmonic components of the current could be obtained. By subtracting these
harmonics from actual value of current, the wave shape of the load current can be made
pure sinusoidal. Figure 4.4 shows the whole process in brief. Figures 4.5, 4.6, and 4.7
show the comparison of actual and corrected waveform for the arc furnace current in
three phases.
t=0
Historical data
Actual new data
Algorithm
Predicted data
FFT
+
+
-
-
Fundamental
component:
A 60 Sin( w t+ j 60 )
Amplitude-A 60
Phase- j 60
Filtered data
Figure 4.4 Process of power conditioning for the test RT-E04