5
vacon • 23
BASIC VARIANTS
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2. Independent output control (not yet supported)
Figure 23. Independent output control
Interleaving is a method to cancel partially or completely certain harmonics from the spectrum.
With a standard 3-phase inverter unit, a natural way is to have a 120 degree phase shift with each
triangle carrier. The result is that the maximum peak to peak ripple is reduced to one third of the
individual phase current ripple. Thus, while the sum current is multiplied by factor of three, the
maximum relative output current ripple is reduced to 1/9. The equivalent switching frequency in the
output is three times the switching frequency.
Figure 24. Example simulation with interleaved control and d = 1/2: leg currents and sum current.
I = 100 A/leg, L = 2050
u
H, Udc = 1025V
Curve info
rms
max
min
peak to peak
I 1
100.3
113.0
87.0
25.9
I 2
100.3
113.0
87.0
25.9
I 3
100.3
113.0
87.0
25.9
I Battery
300.0
304.6
295.4
9.1
HF
HF
350
I [A]
Time [ms]
I1
I3
I2
I Battery
Currents
Interleaved
300
250
200
150
100
50
40
40.10 40.20 40.30 40.40
40.50 40.60 40.70 40.80 40.90
41
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