Reduced Switches Based Three-Phase Multi-Level Inverter for Induction Motor applications

Abstract

In recent decades, the demand for high voltage, high power inverters that capable to transfer a high power, has increased due to the industrial and residential demands. However, the traditional converters rating power are limited to the rated power of the used semiconductor devices and the allowed switching frequencies. The idea of introducing multilevel inverters strongly has appeared to overcome the previous traditional inverters drawbacks. The general concept of multi-level inverter is to utilize isolated dc sources or a bank of series capacitors to produce ac waveforms with higher amplitude. The salient advantages of these inverters are small output voltage step, which results in high power quality, low harmonic components, better electromagnetic compatibility, and low switching losses. The proposed inverter operates with symmetrical DC power sources and low frequency modulation technique as well. The main contribution of the proposed topology is the total number of the active power switches used to generate the same number of levels compared to the previous topology is reduced by25 %. Therefore, it is expected that the proposed inverter has high efficiency and low control complexity due to the decreased number of the power switches. The operation of the proposed inverter hasbeen conducted by simulation results. Moreover, a comparison between the proposed inverter output is connected to  Induction motor application