THD Analysis and Comparison of Different Cascaded Multilevel Inverters for Improving the Quality of Energy

摘要

Quality of energy is the main issue in all electrical supply due to various power quality problems. This problem is more dominant in ac supply system having power converter. Multilevel inverter can solve this problem by reducing harmonics in the supply system. This paper mainly aims to extend the knowledge about the different multilevel inverter topologies with THD analysis for different type of loads. These inverters can be useful for high power and medium voltage system. The modulation technique used is sinusoidal pulse width modulation technique for synthesizing wave forms with better harmonic spectrum and with less total harmonic distortion for generating a staircase waveform. This waveform is similar characteristics with sinusoidal waveform. The simulation for different multilevel inverter are done using MATLAB/SIMULINK.