WSEAS Transactions on Systems
Print ISSN: 1109-2777, E-ISSN: 2224-2678
Volume 15, 2016
Total Harmonic Distortion Optimization of the Line Voltage in Single Source Cascaded Multilevel Converter
Authors: , ,
Abstract: This paper describes the harmonic content optimization process of the line voltage in a three-phase H-bridge cascaded multilevel converter with single source topology and 9 levels per phase voltage and 15 levels per line voltage. For optimization reason it was developed a mathematical expression to calculate the line voltage THD in terms of switching angles at the first quarter of the phase voltage modulation waveform. Then problem becomes purely numerical and it’s solved using a genetic algorithm, which allows finding a modulation with a THD value close to zero. In order to verify the simulation results, a multilevel power converter with the mentioned topology was developed and its performance tested, with different types of loads.
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Keywords: Multilevel power inverter, multilevel PWM modulation, H-bridges cascaded single source, THD, genetic algorithm, optimization
Pages: 110-120
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 15, 2016, Art. #13