Capacitor commutated converter circuit configurations for DC transmission

Two nonconventional HVDC converter arrangements are compared. These include the capacitor commutated converter (CCC) in which series capacitors are included between the converter transformer and the valves, and the controlled series capacitor converter (CSCC), based on more conventional topology, in which series capacitors are inserted between the AC filter bus and the AC network. Results show that both options have comparable steady state and transient performance. Danger of ferroresonance with the CSCC option is eliminated by controlling the amount of series compensation.