Design of multilevel inverter system for voltage enhancement

Abstract

Advancement in technology has made the power electronics an integral part ofour daily life. Its applications can be seen in many areas like transportation,residential, industrial, telecommunication and aerospace sectors etc. Nowadays,many industrial applications require high power, where power electronicsconverters such as Multilevel Inverters (MLIs) are highly recommended becauseof their prominent features. These include reduced harmonics, minimumswitching losses, electromagnetic compatibility and good power quality etc. atmedium voltage and high power. In this thesis, an attempt has been made todesign an MLI system, which provides improved voltage profile and minimumTHD. The designed system is also suitable for industrial appliances working onmedium voltage with high power requirement. Some of the conclusions drawnfrom the thesis are that, renewable energy sources such as PV panels can beeffectively integrated with the MLI system for better utilization of electric power.Among the existing MLIs topologies, CHB topology is the most promisingalternative for the PV applications. Same number of output voltage levels can beachieved using CHB topology with fewer switches as compared to othertopologies. Use of PV panels rather than DC sources is more economical and environmentally friendly. With the aid of devices like MLI-based STATCOM, system performance and reliability can be enhanced in terms of better voltage regulation and power quality. newline