Abstract
This paper presents the Archimedes optimization algorithm to eliminate selective harmonics in a cascaded H-bridge (CHB) multilevel inverter (MLI). The foremost objective of the selective harmonic elimination (SHE) is to eliminate lower order harmonics by finding the optimal switching angle combination which minimizes the objective function containing Total Harmonic Distortion (THD) and other specific harmonic terms. Consequently, the THD is also reduced. In this study, a recently proposed metaheuristic technique named the Archimedes optimization algorithm (AOA) is used to determine the optimal angles corresponding to the 5, 7 and 9 level CHB-MLI. AOA involves equations related to a physical law, the Archimedes Principle. It is based on the idea of a buoyant force acting upward on a body or object that is partially or completely submerged in a fluid, and the upward force is related to the weight of the fluid displaced. This optimization technique has been implemented on CHB-MLI to generate various level outputs, simulated on MATLAB™ R2021a version environment software. The simulation results reveal that AOA is a high-performance optimization technique in terms of convergence speed and exploitation-exploration balance and is well-suited to the solution of the SHE problem. Furthermore, the laboratory validated the simulation result on a hardware setup using DSP-TMS320F28379D.
Highlights
Renewable energy such as wind and solar energy provides dc power that can be converted into ac power by an inverter
The cascaded H-bridge (CHB)-multilevel inverter (MLI) model to generate an output voltage at five-level, seven-level and nine-level has been modeled in MATLAB® Simulink
The Total Harmonic Distortion (THD) of the output voltage of the CHB multi-level inverter has been improved by evaluating the switching angle using the Archimedes optimization algorithm (AOA) and eliminating the lower order harmonics
Summary
Renewable energy such as wind and solar energy provides dc power that can be converted into ac power by an inverter. The cascaded H-bridge (CHB) is the most commonly used MLI due to its simple and modular structure and low component count [3] This modular design allows for easy extension of the output voltage levels without increasing the power circuit’s complexity or requiring extra clamping diodes or voltage balancing capacitors. Fundamental frequency switching techniques such as selective harmonic elimination (SHE) and space vector modulation have attracted a lot of interest in recent years because they increase power conversion efficiency, reduce power losses, and lower prices [5]. This study proposes a new population-based technique named AOA, which is based on the physics law known as Archimedes’ principle, to compete with this state-of-the-art and contemporary optimization algorithm as well as other physics-inspired methods.
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