Three Phase Rectifier

[govender1]

How does one calculate the output dc voltage of a 12 pulse rectifier? The secondary of the transformer has two windings phase shifted at 30 degrees to each other and each winding has a voltage of 1.22KV. This feeds into two six stack uncontrolled rectifier.

Thanks

 

[jbartos]

Suggestions:
1. Ideal no-load direct current voltage Udio = 3 x sqrt2 x s x m x Ul / pi, in VDC
where
pi = 3.14
s = number of bridges connected in series
m = transformer ratio
Ul = AC bus voltage on the transformer primary (secondary has the DC arrangement)
2. Udio may be further decreased by phase control
3. s=2 for two six stack uncontrolled rectifier connected in series (12 pulse total)