A new hysteresis band current control technique for a shunt active filter

This paper proposes a hysteresis band (HB) current control technique to reduce the power losses in a shunt active filter. During a switching period in the zero-crossing region, the inverter output current flows through a transistor. By changing the direction, it flows through the free-wheeling diode of the same switch in an inverter leg, or vice versa. The shunt active filter 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 filter are reduced by using the proposed technique.

Anahtar Kelimeler:

Harmonics, shunt active filter, hysteresis band current control, power losses

A new hysteresis band current control technique for a shunt active filter

Keywords:

Harmonics, shunt active filter, hysteresis band current control, power losses,

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Conclusion
In this study, a HB current control technique is proposed for the shunt active filter. The proposed current
controller reduces the power losses because there is not any switching in the zero-crossing regions. The current
of the shunt active filter current typically has 6 zero-crossing regions.
Using the proposed technique, the
efficiency of the shunt active filter is improved. The proposed technique and the conventional technique are
compared at different HB widths. The experimental results show that the proposed technique causes less power
loss compared with the conventional technique at the same source current THD value. The experimental results
validate the performance and the feasibility of the proposed method. 1 0.1 0.2 0.3 0.4 0.5 HB [A] 1 0.1 0.2 0.3 0.4 0.5 HB [A] 1 20 1 2 3 4 5 6 7 8 9 THD [%] 90 1 2 3 4 5 6 7 8 9 THD [%]
Figure 12. a) HB width-THD, b) HB width-power losses, c) THD-power losses, d) THD-efficiency of the conventional
technique and the proposed technique.
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