Modeling and measuring results of a shunt current source active power filter with series capacitor

In this paper, a method for reducing the voltage stresses on switching components and power losses in a shunt current source active power filter (CSAPF) is presented. The method is based on the series capacitor structure which is used to block the fundamental supply voltage component. The computational capacitor voltage balancing is studied to compensate the effects of the phase asymmetry. The frequency domain behavior of the harmonic control and main circuit is examined. The results show that the voltage stresses and power losses are lower in the CSAPF with a series-connected capacitor than in the conventional topology.