Cable losses resulted of instantaneous compensation with shunt active power filters

This paper discusses on the supply-line cable losses of shunt type active power filters (APF) in three-phase four-wire systems according to two instantaneous compensation methods: 1) for eliminating the total instantaneous-reactive current where the neutral current can still flow; 2) for eliminating the modified instantaneous-reactive current where the neutral current is compensated at zero. Total cable losses (line and neutral) obtained with the second approach are lower than those obtained with the first approach. It was demonstrated in common situations of medium and low relative-values of the zero-sequence voltage.