Fundamentals of a series capacitor commutated HVDC terminal

The increased interest to this HVDC technology, which has been put forward as one of the possible advanced HVDC technologies to be implemented in the next century, is based on studies accomplished as early as in the 50s-60s. The paper contains basic equations, derived long ago by Russian experts, and their analysis. The considerations on the controllability of a series capacitor commutated converter and on the transformerless arrangement of a series capacitor commutated HVDC terminal, will hopefully be useful in further development of this technology.