Hybrid power filters for three-phase four-wire systems
Neutral-line overloading is a serious problem for three-phase distribution systems. In
this paper, a hybrid power filter is considered, suppressing neutral-line current harmonics
in three-phase four-wire networks. The hybrid filter consists of a series connected passive
power filter and a single-phase power converter. Simulation results confirm that the
proposed hybrid filter can effectively mitigate neutral-line current harmonics whether the
loads are balanced or not.