PD IEC TR 60919-1:2020 PDF

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 — 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 ...