multi-function of series active power filter is
presented to achieve current harmonic and load voltage
regulation. Under the normal utility voltage condition, the series
inverter is controlled to achieve current harmonic suppression so
that the total harmonic distortion is reduced. If the abnormal
utility voltage is detected at the load side, the series inverter is
operated as a controlled voltage source to protect the sensitive
loads against the voltage disturbances due to short-term
abnormal voltage conditions. The reduced switch-count inverter
is used in the single-phase system to compensate voltage
disturbance for low power applications. The front-end diode
rectifier is used to supply the necessary active power under the
voltage sag condition. The adopted topology and control strategy
are evaluated through several simulation studies.