Laboratory implementation of a hybrid series active power filter system part I: Designing of passive components

A practical study of a hybrid series active power filter (HSAPF) for current harmonic compensation is presented in this paper. Part 1 emphasizes on the dimensioning and the designing of the passive components of the HSAPF namely the source impedance, passive filters (based on resonant LC circuits), and the current transformers. The needed electric coils were handily manufactured in the workshop using a separately excited DC machine. With the proposed winding method, it is possible to design all desired coils just by the knowledge of their geometric dimensions. To verify the validity of the proposed approach (applied to two different power scales) simulation and practical results are provided and discussed. The obtained results demonstrate the effectiveness of the adopted passive filtering technique in removing the harmonic distortion of the source current, and to compensate the power factor without adding further disturbance such as unbalance, which results in an improved power quality.