Wideband harmonic compensation with a voltage-source hybrid active power filter

In this paper a voltage-source hybrid active power filter is examined. Wideband harmonic compensation is achieved by improving the active power filter performance with two methods. Filtering of the low order harmonies is improved with a simple computational control delay compensation method applied to the control system, while the high order harmonics are filtered with a small passive high pass filter connected parallel to the active filter. The control system is presented and the system performance examined with measurements at various operating points. The power losses caused by the hybrid filter system are presented and they are compared to the losses of a voltage-source shunt active filter. The benefits of the proposed system can be clearly seen in the results.