NEUTRAL LINE CURRENT REDUCTION USING SINGLE PHASE ACTIVE POWER FILTER IN THREE-PHASE FOUR-WIRE POWER SYSTEM

摘要

A neutral line current reduction of three-phase four-wire power system using an active filter for a single power is provided to reduce power energy in a load by decreasing a current on a neutral line. An active filter for a power includes a neutral line(12), phase lines(11a,11b,11c), nonlinear loads(13a,13b,13c), a single transformer(14), an inverter(15), and a capacitor(16). The single transformer(14) is connected to a phase line of the neutral line(12) and three phase lines(11a,11b,11c). The inverter(15) of an H-bridge is connected to an inductor(15) from the transformer(14). The capacitor(16) operates as constant voltage source according to a switching operation of the inverter(15) of the H-bridge. The inverter(15) of the H-bridge outputs a compensation signal for compensating a neutral line current.