Multilevel inverters generate high-level voltage with high quality and low-harmonic distortion, and these unique properties have increased their applications in renewable energy sources. However, these inverters requi...
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Multilevel inverters generate high-level voltage with high quality and low-harmonic distortion, and these unique properties have increased their applications in renewable energy sources. However, these inverters require several passive components and a complexpulsewidthmodulation (PWM) controlmethod. Besides, they suffer from voltage balancing problems. In this work, a new inverter has proposed that generates seven-level voltage from one DC source by reduced number of switches which does not exhibit any voltage balancing problem. The proposed inverter without any extra boost circuit is able to increase the input voltage. The voltage stress on all the switches in the proposed inverter is the same. In this study, variable amplitude phase disposition PWM controlmethod that is compatible with the proposed inverter is developed. Moreover, extended structure of the proposed inverter and its new algorithm in generating all odd and even voltage levels are proposed. To validate the performance of the inverter, a prototype has been built and tested and also its performance has been modelled using PSCAD/EMTDC software package. Very good agreement has been achieved between experimental results and simulations.
Recently applications of multilevel converters have been pointed out because of some advantages include high-quality output waveform, reduced harmonic distortion and lower electromagnetic interference. However, some d...
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Recently applications of multilevel converters have been pointed out because of some advantages include high-quality output waveform, reduced harmonic distortion and lower electromagnetic interference. However, some drawbacks such as increased number of components like switches and dc power supplies and complex pulse width modulation control method are associated with these converters. In this study, a new cascade multilevel converter is introduced named 'cascade-multi-cell' converter. First, the basic constitutive of the proposed multilevel converter has been explained. Then, symmetric and asymmetric configurations are presented. The number of switches and gate driver circuits in the proposed structure are less than the conventional cascade converter. Therefore its output voltage levels will be increased. Also, the number of on-state switches is reduced in presented topology, and so the conductive losses will be reduced. The peak inverse voltage of the proposed converter is equal with the traditional cascade converter. Finally, simulation and experimental results are presented. The presented results show the validity and effectiveness of the proposed multilevel structure.
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