FFT Analysis of Flying Capacitor Multilevel Inverter Based Shunt Active Power Filter

Abstract

In this paper, the simulation models, output waveforms and FFT analysis of flying capacitor multilevel inverter based shunt active power filter are presented. The main advantage of this topology as compared to the conventional inverter and other multilevel inverter topologies is that it has low switching losses, voltage stresses, better total harmonic distortion performance, and low dv/dt and EMI. The multi carrier PWM technique in order to switch the multilevel inverter, reference generation algorithm is based on instantaneous PQ reactive power theory to generate the compensating currents which feed to the inverter to generate 180 degrees out of phase voltages which inject into the system to mitigate the harmonics and reduce the total harmonic distortion. The FFT analysis algorithm is used to analyze the performance of the design which give the successful reduction in the harmonics which is 8% without shunt active power filter and after using this filter the harmonic distortion reduced to 2%.