Page 111 - Power Quality in Electrical Systems

94 Chapter Six

Utility source Filter PCC
Rline Ls vpcc
v s + 0.01 Ω 220 uH + + + +
−
L1 L2 L3 − − − −
l l l l
500 uH 500 uH 500 uH 1 5 7 11
C1 C2 C3
611 uF 312 uF 306 uF

R1 R2 R3
0.01 Ω 0.01 Ω 0.01 Ω
(a)

500 V

0 V

−500 V
100 ms 110 ms 120 ms 130 ms 140 ms 150 ms 160 ms 170 ms 180 ms 190 ms 200 ms
v(vpcc) Time
(b)

500 V

400 V

300 V

200 V

100 V

0 V
0 Hz 100 Hz 200 Hz 300 Hz 400 Hz 500 Hz 600 Hz 700 Hz
v (vpcc) Frequency
(c)
Figure 6.19 The system of Example 6.3 with single-tuned sections added. (a) The circuit.
(b) The PSPICE simulation showing the load voltage. (c) The spectrum of the load voltage