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4 Using the Regenerative Power System
Limiting Sinusoidal Outputs
Generating Sinusoidal Outputs
Unipolar voltage RP7900 series power supplies were not intended to operate as a sinusoidal AC source
or load at the local grid frequency. Under these conditions the unit may shut down. To avoid this issue
when generating sinusoidal outputs, you must shift the output sinusoid frequency away from the local
grid frequency as shown in the following graphs.
RP793x, RP795x 10 & 5 kW, 200//208 VAC Input
Assuming that a sinusoid is to be imposed on top of a (1/2)*V
possible AC power is calculated below. Note that operating the unit near the local grid frequency will
generate additional harmonics on the AC input lines.
V
= V
/2
dc
max
V
= V
/2
sin_amplitude
max
V
= V
/(2*√2)
ac_rms
max
I
= I
sin_amplitude
max
I
= I
/√2
ac_rms
max
P
= (V
+ V
peak
sin_amplitude
P
=
*I
= (V
ac
Vac_rms
ac_rms
For example:
P
= (40V+40V)*125A = 10kW
peak
P
= (80V*125A)/4 = 2.5kW
ac
Note that the instantaneous P
144
)*I
dc
max
*I
)/4
max
max
cannot exceed the DC power rating of the unit.
peak
RP794x, RP796x 10 & 5 kW, 400//480 VAC Input
DC offset voltage, the maximum
max
Keysight RP7900 Series Operating and Service Guide
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