Declining multi inverter based total harmonic distribution with the aid of hybrid optimization technique

Abstract

newline quotMultilevel inverter is a device used for converting DC voltage to AC voltage. Multilevel newlineinverters are a source of high power, often used in industrial applications and can use either sine newlineor modified sine waves. Generally IGBT switches are used in the inverter to control this newlineswitching operation. Instead of using one converter to convert an AC current into a DC current, a newlinemultilevel inverter uses a series of semiconductor power converters (usually two to three) thus newlinegenerating higher voltage. At the output of the multilevel inverter the sine wave form produces newlinelarge harmonics. To reduce these harmonics at the output signal, the corresponding THD of newlineswitching angles must be reduced. Generally genetic algorithm is used for harmonic newlineoptimization. But the drawback is the cost function becomes more difficult to optimize and newlinerequires increased number of iterations. Hence to reduce the number of iteration we proposed a newlinehybrid of Genetic algorithm and Particle swarm optimization algorithm to optimize the switching newlineangles. Hence the corresponding THD value is also reduced. The proposed technique is newlineimplemented in the MATLAB/simulink working platform. newlinequot newline