Analysis and design of a shunt active power filter employing a dead beat control technique

This paper presents a single shunt AC active power filter employing a voltage source inverter connected between the source and the load. This configuration allows the active power filter to compensate the reactive power drawn by the load, thus correcting to the source side, both the displacement power factor and the harmonic distortion. The active power filter is controlled by a dead beat technique, based on a high speed DSP, which provides a high quality and low THD source current, even in the presence of load current harmonics, load transients and reactive current, improving the total power factor. Moreover, due the control employed following a reference, the compensator is characterized as an intrinsic filter. Additionally, design of the DC and AC filters is presented. The influence of the line and load impedance on the dynamic of the compensation is also analyzed, improving its stability and response, if such values are inside in one interval. The proposed compensator focuses on its simplicity for implementation. Transient tests shows the filter's high performance dynamic characteristics.