1 Scope
This part of IEC 60919 provides general guidance on the steady-state performance requirements of high-voltage
direct current (HVDC) systems. It concerns the steady-state performance of two-terminal
HVDC systems utilizing 12-pulse converter units comprised of three-phase bridge (double-way)
connections (see Figure 1), but it does not cover multi-terminal HVDC transmission systems. Both terminals
are assumed to use thyristor valves as the main semiconductor valves and to have power
flow capability in both directions. Diode valves are not considered in this document.
Figure 1
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Twelve-pulse converter unit
1
Transformer valve windings
Only line-commutated converters are covered in this document, which includes capacitor
commutated converter circuit configurations. General aspects of semiconductor line-commutated
converters are given in IEC 60146‑1‑1, IEC TR 60146‑1‑2 and IEC 60146‑1‑3. Voltage-sourced converters are not considered.
The distinction is made between system ...