Since 1984, DOFASCO inc, Hamilton, Ontario have operated a Static Var Compensator (SVC) delivered by Hitachi Energy in their No. 2 Hot Strip Mill. The rated load of the Hot Strip Mill thyristor converters is approximately 50 MW (70.000 hp). The SVC which has a dynamic range of 60 Mvar is connected to the 14.1 kV Finishing Mill bus.
Its purpose is to stabilize the bus voltage under the varying load conditions which occur during the running of the mill. It furthermore comprises harmonic filters tuned to the 5 th, 7 th and 11 th harmonics in order to supress harmonics generated by the thyristor converters in the rolling mill, thereby preventing these harmonics from entering into the surrounding parts of the network.
It also achieves power factor correction of the rolling mill, thereby relieving the network of reactive power burden and contributing to a decrease of the running costs of the mill.
| Main data | ||
|---|---|---|
| System | SVC |
|
| Commissioning year | 1984 |
|
| SVC for rolling mill | Phase 1 | Extension |
| Controlled voltage | 14.1 kV | 14.1 kV |
| Overall rating | 75 Mvar | 48 Mvar |
| Dynamic range | 60 Mvar | 30 Mvar |
| Controlled voltage | 14.1 kV | 14.1 kV |
| Overall rating | 75 Mvar | 48 Mvar |
| Dynamic range | 60 Mvar | 30 Mvar |
| Harmonic filtering | 4.5 Mvar/5th 2.5 Mvar/7th 8 Mvar/11th |
8 Mvar/5th 2.5 Mvar/7th 8 Mvar/11th |
| Control system | 3-phase symmetrical open-loop reactive power control | |
| SVC for ladle furnace | ||
| Controlled voltage | 14.1 kV |
|
| Dynamic range | 35 Mvar | |
| Harmonic filtering | 25 Mvar/3rd 10 Mvar/5th |
|
| Control system | Phase-wise, open loop reactive power control plus 3-phase symmetrical closed loop reactive power control |
|
