A Comparative Analysis of THD Simulation in an Asymmetric Cascaded Multilevel Inverter


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Abstract


When a multilevel inverter has to be operated, question raises on which modulation strategy to choose in order to have lower harmonic content in the output voltage waveform. Multilevel inverters have been a subject of great interest in the field of power electronics because they present a set of properties that make them more efficient than conventional ones. The purpose of this paper is to verify and compare through simulation the output voltage total harmonic distortion and weighted total harmonic distortion employing low and high frequency and hybrid modulation techniques in an asymmetric cascaded multilevel inverter, using binary DC bus voltage progression. All modulation strategies mentioned before were analyzed in the asymmetric multilevel inverter to verify which one is the most suitable for this type of structure using the two most powerful simulation software in power electronics field, such as PSIM and Matlab-Simulink.
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Keywords


ACMLI; Binary Progression; FFT; Hybrid Modulation; Multicarrier PWM Strategy; Selective Harmonic Elimination; THD; WTHD

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