TABLE OF CONTENTS The CIGRE benchmark model [1] consists of weak rectifier and inverter a.c. systems resonant at the second harmonic and a d.c. system resonant at the fundamental frequency. Both a.c. systems are balanced and connected in star-ground. The system is shown in Figure D.1 with additional information in Tables D.1 and D.2. The HVDC link is a 12-pulse monopolar configuration with the converter transformers connected star-ground/star and star-ground/delta. Figures D.2 D.4 show the impedance scans of the a.c. and d.c. systems. A phase imbalance is created in the inverter a.c. system by inserting typically a 5.0 per cent resistance into one phase in series with the a.c. system.
| Parameter | Rectifier | Inverter |
|---|---|---|
| a.c. system voltage | 345 kV 1-1 | 230 kV 1-1 |
| a.c. system impedance magnitude | 119.03 ? | 52.9 ? |
| Converter transformer tap (prim, side) | 1.01 | 0.989 |
| Equivalent commutation reactance | 27 ? | 27 ? |
| d.c. voltage | 505 kV | 495 kV |
| d.c. current | 2 kA | 2 kA |
| Firing angle | 15 | 15 |
| d.c. power | 1010 MW | 990 MW |
| Rectifier a.c. voltage base | 345 .0 kV |
|---|---|
| Inverter a.c. voltage base | 230 kV |
| Rectifier voltage source | 1.088 ?22.18 |
| Inverter voltage source | 0.935 ?-23.14 |
| Nominal d.c. voltage | 500 kV |
| Transformer power base | 598 MVA |
| Transformer leakage reactance | 0.l8 pu |
| Transformer secondary voltage | 211.42 kV |
| Nominal rectifier firing angle | 15.0 |
| Nominal inverter extinction angle | 15.0 |
| Thyristor forward voltage drop | 0.001 kV |
| Thyristor onstate resistance | 0.01 ? |
| Snubber resistance | 5000 ? |
| Snubber... |
