Power quality enhancement using SVPWM Z-source inverter based DVR

To protect the sensitive loads from voltage disturbances or fluctuations, series active power filters are useful. This type of custom power device, known as dynamic voltage restorer (DVR) can be realized using different inverter topologies. In this paper, Z-source inverter (ZSI) based DVR to compensate the voltage disturbances such as voltage sag, voltage swell, voltage harmonic distortion, voltage unbalance and voltage perturbation, is proposed. Due to ease of digitalization, high utilization of dc bus voltage and reduced harmonic content, space vector pulse width modulation (SVPWM) technique has been used to operate the Z-source inverter. The simulation results based on MATLAB/Simulink are presented to illustrate the effectiveness of SVPWM Z-source inverter based DVR for reducing the harmonic distortion and unbalance in the load voltage, and to compensate voltage sag, voltage swell and voltage perturbation conditions, in the distribution network.