Page 62 - Power Quality in Electrical Systems

Harmonics and Interharmonics 45

4 / π
Harmonic amplitude 4 / 3π 4 / 5π 4 / 7π 4

9
1 2 3 4 5 6 7 8 / 9π
Harmonic number
(b)
Figure 4.1 (Continued)

We see that the harmonics of the triangle wave (Figure 4.2b) fall off
at a faster rate than those of a square wave. This makes sense since the
triangle wave more closely resembles a pure sine wave than a square
wave, and therefore has fewer harmonics than the square wave.

v(t)
1

T
t
T / 2

−1
(a)

8
/ π
Harmonic amplitude 8 / 9π 2 8
2

1 2 3 4 / 25π 2 6 7 8 9
5
Harmonic number
(b)
Figure 4.2 Periodic waveforms. (a) A triangle wave. (b) The spec-
trum of a triangle wave.