Design and Simulation Study of Hybrid Filter for Power Quality Improvement

The power quality problem increase due to the non-linear load which affect the power system. To overcome power quality issues this paper described design and simulation study of hybrid filter. The hybrid filter was explained in this paper which is based on series topology. The hybrid filter is operation of both type of passive filter (PF) and active filter (AF). Where the active filter is formed by three phase voltage source inverter (VSI) with self supported DC link capacitor. The active filter is solving power quality problem like sag, swell, harmonics which is connected in series with source. Passive filter are designed to drain harmonics current which is generated by RL load, so that the passive filter is connected in the across the load. The synchronous reference frame (SRF) theory is control strategy is used for to get reference signal. So that Hybrid filter has advantage that it compensates both type of voltage problem and current harmonics. The proposed system simulation runs in MATLAB / simulink tool were presented to verify the performance of the shunt passive filters (SPH) and active series filters (ASF).