First of all, the reactor must cooperate with the capacitor to form a filter, which has the function of filtering. Adding only one reactor can only partially prevent harmonics from entering the incoming terminal of the power supply, but can't filter them.

Secondly, harmonic control is a systematic project, and it is necessary to measure the harmonic situation of microgrid on the spot in order to give a reasonable scheme. So how to effectively suppress harmonics can only be known after specific measurement and analysis.

If each rectifier is equipped with a filter unit, does it need to be processed at the main power supply? The key depends on how big the harmonics at the power supply entrance are. Personally, I think it should be unnecessary. Unless each filter unit has little effect!