Intended the subject innovation is to improve the control scheme of the current controller of the active power filter for reducing the load harmonic generating a serious harmonic due to a load using a semiconductor electric power conversion system in the process of delivering power to the load from the power system,; As Genie the advantage of the excellent characteristic properties of the transition state of the hysteretic controller of the release of this widely used in the current controller in the existing active power filter, since the modulation frequency is variable within a band the disadvantage that the switching frequency is therefore not constant at all times the current ripple occurs It was constructed by a secure improved hysteresis controller.; Thus, not only can facilitate the current control of active power filter, it is possible to reduce the switching loss and improve power quality by limiting within a predetermined range of the switching frequency.
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