Essay On Multilevel Inverters

Abstract - Numerous industrial applications requires apparatus with require higher power and also some medium voltage motor drives and utility applications need medium voltage and megawatt power levels. It is vexatious to connect only one power semiconductor switch directly for a medium voltage grid. Respectively, a multilevel power converter structure has been introduced for high power and medium voltage situation as an alternative. Multilevel Inverters usually achieve high power ratings, and also enable the use of renewable energy sources such as photovoltaic, wind, and fuel cells. Multilevel Inverter's achieves higher power by using power semiconductor switches with several dc voltage sources. MLI's perform the power conversion by synthesizing a desired staircase voltage

Introduction

Power inverters are basically circuits that convert DC signals to AC signals. First things first so the question come, why we require inverters in first place? That’s simple because AC signal travels easily and is more useful in our daily appliances. And now the question comes why multilevel inverters are required? and the answer to that is even simpler i.e., it is much easier to use multilevel inverters in preference to using multiple power lines. Another million dollar question is what’s the difference between conventional inverters and a multilevel inverter? And the answer to this is as follows:

1. MLI's helps to provide higher power levels.

2. Multiple switches are used to operate MLI's instead of one.

3. MLI's can convert environmental friendly energies like Wind, solar etc to AC.

2. Working of a multilevel inverter, Types And Applications

Switching frequency is the key feature of inverter. Fast switching of DC signal bequeathing multiple levels is obligatory to convert DC signals to AC signals which pirouette into a staircase wave that is nearest to typical sine wave. There are substantially three types of multilevel