Abstract
This paper presents the application of differential evolution algorithm to obtain optimal switching angles for a single-phase seven-level to improve AC voltage quality. The proposed inverter in this article is composed of two H-bridge cells with non-equal DC voltage sources in order to generate multiple voltage levels. Selective harmonic elimination pulse width modulation (SHPWM) strategy is used to improve the AC output voltage waveform generated by the proposed inverter. The differential evolution (DE) optimization algorithm is used to solve non-linear transcendental equations necessary for the (SHPWM). Computational results obtained from computer simulations presented a good agreement with the theoretical predictions. A laboratory prototype based on STM32F407 microcontroller was built in order to validate the simulation results. The experimental results show the effectiveness of the proposed modulation method.
Highlights
The direct current to alternative current (DC/AC) multilevel conversion systems have been drawing a lot of attention in the last few years especially for high voltage and renewable energy applications
This paper is organized as follows: the section explains briefly the structure of the proposed multilevel inverter and its control, the third section covers the application of the differential evolution algorithm for the selective harmonic elimination, this section details the procedures to www.ijacsa.thesai.org (IJACSA) International Journal of Advanced Computer Science and Applications, Vol 7, No 9, 2016 obtain the optimal switching angles and the formulation of the objective function, the fourth section presents the simulation results obtained from the mathematical model of the system and the optimization method
To verify the effectiveness of the proposed method, total harmonic distortion (THD) is used as a performance indicator to evaluate the quality of output AC voltage waveform generated from the multilevel inverter, the THD is defined as the total amount of harmonics related to the fundamental, it can be calculated using the following formula: THD%
Summary
The direct current to alternative current (DC/AC) multilevel conversion systems have been drawing a lot of attention in the last few years especially for high voltage and renewable energy applications. This paper presents a simple and fast optimal solution of harmonic elimination of a seven level inverter with non-equal DC sources using the differential evolution algorithm. This paper is organized as follows: the section explains briefly the structure of the proposed multilevel inverter and its control, the third section covers the application of the differential evolution algorithm for the selective harmonic elimination, this section details the procedures to www.ijacsa.thesai.org (IJACSA) International Journal of Advanced Computer Science and Applications, Vol 7, No 9, 2016 obtain the optimal switching angles and the formulation of the objective function, the fourth section presents the simulation results obtained from the mathematical model of the system and the optimization method.
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