Solving the ferroresonance problem when compensating a DC converter station with a series capacitor

When a DC link feeds into an AC power system where the short circuit ratio is low or very low, the AC voltage requires some form of supplementary control. The concept of a series capacitor located between the AC system and the DC link has been an attractive consideration but is susceptible to ferroresonance between the series capacitor and the converter transformers, Using DC link controls judiciously, it is shown that any onset of ferroresonance can be eliminated. Benefits to series compensating a DC converter are presented.