69
High harmonic
wave degree
High harmonic wave current content (%)
P W M
No ACL (Standard)
Basic
2
3
4
5
6
7
8
9
10
11
12
13
_
_
_
_
_
_
_
3.7
81.6
49.6
27.4
7.6
6.7
_
_
_
_
_
_
_
2.5
83.6
48.3
23.7
6.2
4.7
_
_
_
_
_
_
_
_
97.0
21.9
7.1
3.9
2.8
_
_
_
_
_
_
_
_
97.2
21.7
7.0
3.7
2.6
With power factor modifying ACL
With power factor modifying ACL
With standard ACL
P A M
Power factor = (DC voltage x DC) /( 3 x AC RMS voltage x AC RMS current)
Waveform factor = (RMS value) /(Mean value)
Peak factor = (Max value) /(RMS value)
Circuit
with ACL
Large ACL Small
With
DCL
Input current
Power factor
Below 58.7
58.7%
58.7– 83.5%
83.5%
83.5 – 95.3%
95.3%
1.23
1.28
Above 1.99
1.99
1.99 –1.27
1.27
1.27–1.23
Above 2.16
2.16
2.16 –1.71
1.71
1.71–1.28
Waveform factor
Peak factor
Waveform
(half wave portion)
t
I
ACL
V
E
d
DCL
V
E
d
Table 7.9 Data of High Harmonic Wave Current
Content in Inverter Power Circuit (Example)
Table 7.10 Peak Factor of Inverter Input Current
Note:
No DCL Output frequency 60Hz , subject to 100% load
Fig.7.28 Inverter Input Current
Fig.7.29 Inverter Output Current
(a) PAM system
(b) PWM system
(a) PAM system
(b) Equal-value PWM system
