Principle of Inverter of Frequency converter(3)

Polyphase pulse rectifier.

The method of polyphase rectification can be adopted when the condition allows or requires the harmonic to be limited in a relatively small way. The 12-phase pulse rectifier THDV is about 10 to 15 and 18 phase pulse rectified, the THDV of which is about 3 to 8, meeting the requirements of international standards. The disadvantage is the need for special transformers, which is not conducive to the transformation of the equipment, and the price is high.