Load type: non-ferrous metal refining and chemical industry all use the electrolysis process, so high-power rectifiers are inseparable. The load fluctuation is small. For the high-power three-phase full-control bridge 6-pulse rectifier device, the harmonics generated by the rectifier account for 25-33% of the fundamental wave, and the characteristic harmonics generated are 6N±1 times. The rectifier itself is a source of harmonics in operation, but at the same time its trigger control system is affected by voltage harmonics. The commutation process of the rectifier will cause a "gap" in the voltage, which affects the detection of voltage zero crossings and the synchronization of control triggers.
Recommended solution: passive filter (PF) + anti-harmonic low-voltage intelligent power capacitor.More