Fuji Electric FRENIC MEGA G2 Series - 2 ] Harmonic Current Calculation

Appendix B Japanese Guideline for Suppressing Harmonics by Customers Receiving High
Voltage or Special High Voltage (General-purpose Inverters)
Appendix-16
[ 2 ] Harmonic Current Calculation
(1) “Fundamental harmonic current” size
• When you calculate the amount of harmonics according to Table 2 in Appendix of the Guideline, you have to
previously know the input fundamental harmonic current.
• Apply the appropriate value shown in Table B.2-3 based on the kW rating of the motor, irrespective of the inverter
type or whether a reactor is used.
If the input voltage is different, calculate the input fundamental current in inverse proportion to the voltage.
Table B.2-3 “Input fundamental harmonic current” of general-purpose inverters determined by applicable motor
ratings
Applicable motor (kW)
0.4
0.75
1.5
2.2
3.7
5.5
7.5
11
15
18.5
Input fundamental
harmonic current (A)
200 V
1.62
2.74
5.50
7.92
13.0
19.1
25.6
36.9
49.8
61.4
400 V
0.81
1.37
2.75
3.96
6.50
9.55
12.8
18.5
24.9
30.7
6.6 kV conversion value (mA)
49
83
167
240
394
579
776
1121
1509
1860
Applicable motor (kW)
22
30
37
45
55
75
90
110
132
160
Input fundamental
harmonic current (A)
200 V
73.1
98.0
121
147
180
245
293
357
400 V
36.6
49.0
60.4
73.5
89.9
123
147
179
216
258
6.6 kV conversion value (mA)
2220
2970
3660
4450
5450
7450
8910
10850
13090
15640
Applicable motor (kW)
200
220
250
280
315
355
400
450
500
630
Input fundamental
harmonic curren (A)
200 V
400 V
323
355
403
450
506
571
643
723
804
1013
6.6 kV conversion value (mA)
19580
21500
24400
27300
30700
34600
39000
43800
48700
61400
(2) Harmonic current calculation
Generally speaking, harmonic current is calculated using "Table 3 Three-phase bridge (capacitor smoothing)" in
"Guidelines - Appendix 2". Refer to Table B.2-4 for the guidelines appendices.
Table B.2-4 Amount of harmonic current generation (%), three-phase bridge (capacitor smoothing)
Degree
5th
7th
11th
13th
17th
19th
23rd
25th
No reactor used
65
41
8.5
7.7
4.3
3.1
2.6
1, 8
Reactor used (AC side)
38
14.5
7.4
3.4
3.2
1.9
1.7
1.3
Reactor used (DC side)
30
13
8.4
5.0
4.7
3.2
3.0
2.2
Reactor used (AC, DC side)
28
9.1
7.2
4.1
3.2
2.4
1.6
1.4
• AC side reactor: 3%
• DC side reactor: Stored energy is equivalent to 0.08 to 0.15 ms (100% load conversion)
• Smoothing capacitor: Stored energy is equivalent to 15 to 30 ms (100% load conversion)
• Load: 100%
n
th
degree harmonic current (A)
= Fundamental harmonic current (A) x
Amount of n
th
degree harmonic
current generation (%)
100
The harmonic current for each degree is obtained as follows.