MITIGATION OF HARMONICS IN INVERTER

Abstract

In recent years power electronic converters are widely used in industrial as well as domestic applications for the control of power flow for automation and energy efficiency.Most of the time these converters draw harmonic current and reactive power from AC source and causes the power quality problems. Recently multilevel power conversion technology has been a very rapidly growing area of power electronics with good potential for further developments. For a multilevel inverter, switching angles at fundamental frequency are obtained by solving the selective harmonic elimination equations in such a way that the fundamental voltage is obtained as desired and certain lower order harmonics are eliminated. The most attractive applications of this technology are in the medium to high-voltage range. Multilevel inverters have many advantages such as low power dissipation on power switches, low harmonic and low electromagnetic interference (EMI) outputs. This paper provides a concise review on multilevel inverter and different levels of cascaded H-Bridge connection.