Hybrid shunt active filter offering unity power factor and low THD at line side with reduced power rating

This paper present analysis of hybrid active power filter with synchronous reference frame control algorithm. The proposed topology consist of active power filter and passive power filter are connected in shunt with the mains feeding a nonlinear load. The shunt passive power filter is tuned to eliminate most dominate 5
^th
order load current harmonic. The shunt active power filter is used compensate all other higher order load current harmonics. This approach help to reduce the overall rating of shunt active power filter, and maintain unity power factor at line side with low THD, which makes system more economical for industrial usage. Detail design steps for 5
^th
order tuned filter is also discussed and results are presented. The proposed shunt active power filter is also tested for dynamic loading condition. Hardware results for the verification of proposed control algorithm is also presented and discussed.