and Computer Engineering 3(1): 111-115(2014) Hybrid active Power Filter for Power line Conditioning

ABSTRACT: This paper investigates mitigation of current harmonics using five level cascaded multilevel inverter based shunt hybrid active power filter (SHAPF) and to improve power quality of the system. The main objective of this paper is to develop and analyze the compensation characteristics of cascaded multilevel inverter based shunt hybrid active power filter by employing indirect current control algorithm. This work explores design and analysis of Hybrid Active Power Filter (HAPF) based in p-q instantaneous theory and using trianguler sampling current controller to obtain the gating signals for five-level diode clamped multilevel inverter (DCMLI). The technique used is capable of reducing the Total harmonic distortion drawn by the non-linear load, compensate the reactive power and correct the power factor, therefore, the power quality problem of a distribution system is reduced especially harmonic problems. The simulation results of the systems have been carried out with MATLAB. Also, the PI controller is employed to reduce the ripple voltage of the dc capacitor of the diode clamped inverter. The designed system have been tested the effect of the control approaches for real time current compensation harmonics for steady state condition