Digital Implementation of SPWM 7-Level Inverter Using Microcontroller

Abstract

Currently, green energy is knowing a massive growth in the world with the growth of newer energy sources such as wind energy, hydro energy, tidal energy geothermal energy, biomass energy and of Corse the Solar energy which is considered the second biggest source of electricity worldwide including morocco. The production of electricity via these centrals requires optimization at the different conversion levels. To obtain electricity that meets the standards of the electrical grid (sine wave of frequency 50 Hz), the inverter remains the first element to design and build. The structures based on multi-level inverters have brought an undeniable advantage to alternative continuous conversion, especially in high power applications. In this article a new 7-level inverter architecture with only six switches is presented and compared along with the other seven level inverter topologies. To improve the performance of our proposed multilevel inverter, we used a digital sinusoidal Pulse Width Modulation (SPWM) strategy using the Arduino wich leads to further reduction of THD. In this paper, the inverter was tested using Proteus software and Matlab Simulink simulator for harmonic analysis. Then real-time implementation of inverter was tested for a resistive load.