Research Article

Abstract: This paper proposes a hysteresis band (HB) current control technique to reduce the power losses in a shunt active lter. During a switching period in the zero-crossing region, the inverter output current ows through a transistor. By changing the direction, it ows through the free-wheeling diode of the same switch in an inverter leg, or vice versa. The shunt active lter current typically has 6 zero-crossing regions during a fundamental frequency cycle. This paper presents a HB current control technique where there is not any switching in these 6 zero-crossing regions per period, which results in reducing the power losses. The experimental results clearly show that the power losses of the shunt active lter are reduced by using the proposed technique. Key words: Harmonics, shunt active lter, hysteresis band current control, power losses 1