Page 77 - Power Quality in Electrical Systems

60 Chapter Four

R sys L sys R tr L tr V LOAD
V s + 0.000443 2.81 µH 0.0023 36.6 µH Cbank
−
6900 µF
I5 + −

(a)
600 V

400 V

200 V

0 V

−200 V

−400 V

−600 V
100 ms 110 ms 120 ms 130 ms 140 ms 150 ms 160 ms 170 ms 180 ms 190 ms 200 ms
V(Vline) Time
(b)
Figure 4.19 The circuit for Example 4.5 with fifth-harmonic load current added. (a) The
circuit. (b) The load voltage.

R sys L sys R tr L tr V LOAD
V + − 0.000443 2.81 µH 0.0023 36.6 µH Cbank
s
6900 µF
I 5 I 7 l l l
− + + − 11 + − 13 + − 17 + −

(a)
Figure 4.20 The circuit for Example 4.5, with 5th, 7th, 11th, 13th, and 17th harmonics.
(a) The circuit. (b) The load voltage.