Ac Voltage And Current Waveforms - ABB ACS800 Series Hardware Manual

AC voltage and current waveforms

The AC current is sinusoidal at a unity power factor. The IGBT supply unit does not
generate characteristic current or voltage overtones like a traditional 6- or 12-pulse
bridge does.
The Total Harmonic Distortion (THD) in current is given in chapter
Input power
Ratio in the Point of Common Coupling (PCC). The high frequency switching and
high du/dt slightly distort the voltage waveform at the input of the converter.
Typical line current (i) and voltage (u) waveforms are shown below.
Example spectra of the current and voltage distortion at the output of the transformer
are shown below. Each harmonic is presented as compared to fundamental voltage
(reference value = 1). n denotes the ordinal number of the harmonic.
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
connection. The THD in voltage depends slightly on the Short Circuit
u (V)
i (A)
Test 13
n
t (ms)
t (ms)
1.6
1.4
1.2
1.0
0.8
IL1 [A]
0.6
0.4
0.2
0.0
Operation principle and hardware description
Technical data:
Test 13
n
31
UL12 [%]