Uncontrolled 3phase SCR rectifier power factor refining

neaeds to clear one issue before I commmet. Is the current COS Phi under load is 0.97?
If that is the case you have nothing for you to do. I do not belive it is.

IGBT's are a good solution but limited in power modules. but the generate other filtering

issues. Increasing inductance eon the DC side is also a solution. Calculation is required to increase (or decrease) inductor size. Transfoemers (K20 rating) should not be overlooked in this matter.

It is very difficult to address cost efficient solution. I recommend an engineering advisory for this matter . It may cost money but you will win on the long run.

Contcat me,I will direct you to the right people to handle it. 905 845 3666.

If the cos is 97, you should not need to correct for power factor. In the USA, the utility companies in different regions have different target power factors they require of their industrial customers in order to avoid an extra charge. I do not know of any that penalize their customers until .95. However, if your switching power supplies make up a significant part of your load, you may have harmonic problems.

Hello

the simplest way to improve the power factor of your system is to use 18-pulse or 24-pulse rectifiers. these systems can be realized with minor modifications of the transformers, which you are using anyway.
Increasing the choke inductance does not improve the power factor. if the choke is very big, then the main current does look like a sort of an staircase. if you now use a higher number pulse rectifier, these current steps become smaller and the power factor improves. the use of active switch systems is not economical, because you have to buy extra high frequency filters.

Hello

there is a paper on the internet which describes different possible solutions of your problem.
"Autotransformer configurations to enhance utility power quality of high power ac/dc rectifier systems"