A hybrid compensation system comprising hybrid power filter and AC power capacitor

In this paper, a hybrid compensation system for harmonic suppression and power factor correction is developed and analyzed. This compensation system consists of a hybrid power filter and an AC power capacitor. A small capacity power converter and a passive power filter is serially connected to have the function of hybrid power filter, and then the hybrid power filter is connected in parallel to the AC power capacitor to form a hybrid compensation system. The major function of the hybrid power filter is the harmonic suppression, and the AC power capacitor performs the power factor correction. Furthermore, a method, inserting an inductor in series with the AC power capacitor, is proposed in this paper for avoiding high frequency resonance amplification between the hybrid power filter and the AC power capacitor. To demonstrate the performance of this hybrid compensation system, a three-phase prototype is developed and tested. The tested results show that the insertion of an inductor in series with the AC power capacitor can prevent high frequency resonance amplification between the hybrid power filter and the AC power capacitor.