Lust CDA34.006 - Page 69

CDA3000 Operation Manual
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Mains load (example)
Mains voltage asymmetry (example)
Recommended:
The example shows that the benefits of a line choke with 4 % short-circuit
voltage are multi-faceted. We therefore recommend that you use a line
choke as a matter of course.
Without line choke With line choke Change
4 kW inverter,
mains impedance
0.6 mH
4 kW inverter,
mains impedance
6mH
Without line choke
compared to
with line choke
Voltage distortion (THD)
1)
99 % 33 % -67 %
Mains current amplitude 18.9 A 9.7 A -48 %
Mains current effective 8.5 A 6.23 A -27 %
Commutation notches
referred to the mains
voltage
28 V 8 V -70%
Life of the DC-link
capacitors
Nominal life
2 to 3 times
nominal life
+100 to 200 %
1) THD = Total Harmonic Distortion (U
5
...U
41
)
Table A.1 Change in system load resulting from insertion of a line choke
with 4% short-circuit voltage based on the example of a 4 kW
inverter CDA34.010
Without line choke With line choke
4 kW inverter, mains
impedance 0.6 mH
4 kW inverter, mains
impedance 6 mH
Asymmetry of mains
voltage
0 % +3 % -3 % 0 % +3 % -3 %
Mains current amplitude 18.9 A 25.4 A 25.1 A 9.7 A 10.7 A 11 A
Mains current effective 8.5 A 10.5 A 10.2 A 6.2 A 6.7 A 6.8 A
Table A.2 Effect of the line choke with asymmetrical mains voltage
based on the example of a 4 kW inverter CDA34.010