A digitally controlled three-phase active filter with a partially resonant circuit

A digitally controlled three phase active filter is described in this paper. The active filter has a partially resonant circuit for high efficiency. The advantages of the digital control are less affection by the environment, good response for input/output changes, the good regulation, fewer adjustment points and fewer number of the parts compared with an analog one. These advantages are confirmed by a 2.5 kW unit, and both digital and analog control data are shown