Page 82 - Power Quality in Electrical Systems

Harmonic Current Sources 65

+
i s
v L
I L
v s
−

(a)

v (t)
s
i (t)
s
I L
t

(b)

1.0
Harmonic amplitude of line current 1 / 3 1 / 5 1 / 7 1 / 9 1 1 1

/ 11
/ 13
/ 15
1 3 5 7 9 11 13 15
Harmonic number (N)
(c)
Figure 5.2 Full-wave rectifier with current source load. (a) The circuit. (b)
Waveforms, showing line-voltage and line current. Line current is a square
wave. (c) The spectrum of the line current, showing the characteristic 1/N
rolloff in spectral component amplitude with harmonic number.

+
i s
v BUS
I L
C BUS
v s
−

Figure 5.3 A full-wave rectifier with current source load, I L , and capac-
itive filter, C BUS .