1, the energy-saving power supply by the two groups of three-phase full-control rectifier bridge series 12-pulse converter to the parallel inverter power supply, greatly improving the power factor (92%
2, the energy-saving power line into the line 380v line can get 1000v dc voltage, 500v into the line voltage to meet the power requirements of a large power 20000kv device.
3, the energy-saving greatly reduce the power grid harmonics, the average power factor is high, a large number of reactive power compensation device capacity, or even save the reactive power compensation device.
4, the energy flow through the rectifier transformer winding dc component current is almost zero, greatly improving the utilization of rectifier transformers, you can reduce the power supply transformer capacity to reduce costs.
5, the energy-saving power supply, the two sets of power supply current equal, not only simple debugging, but also reduce the dc filter reactor active loss, improve efficiency.
6, energy-saving calculation: 10k furnace 6000kw as an example
two classes of work for 14 hours, daily electricity q = 6000 × 2 × 7 = 84000 degrees;
annual electricity consumption, according to energy-saving 9%
saving 2721600 degrees, the annual savings of electricity 2721600 × 0.40 yuan / degree = 109 million.
two bridge phase series structure of the 12-pulse rectifier as shown:
twelve - pulse rectifier series technical parameter table
| 额定容量 | 额定功率 | 变压器容量 | 输入电源 | 频率 | 熔化率 | 电耗化钢 |
| 0.5 | 400 | 400 | 380 380 | 1000 | 0.6 | 660 |
| 0.75 | 500 | 630 | 380 380 | 1000 | 0.75 | 640 |
| 1 | 800 | 1000 | 380 380 | 500 | 1.05 | 620 |
| 1.5 | 1250 | 1600 | 380 380 | 500 | 1.85 | 600 |
| 2 | 1600 | 2000 | 380 380 | 500 | 2.25 | 590 |
| 3 | 2500 | 2500 | 460 460 | 500 | 3.15 | 570 |
