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Hybrid Cascaded MLI topology using Ternary Voltage Progression Technique with Multicarrier Strategy
Jamuna Venugopal,Gayathri Monicka Subarnan 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
A major problem in conventional multilevel inverter is that an increase in power semiconductor switches causes an increase in cost and switching losses of the inverter. The multicarrier strategy adopted for the multilevel inverters has become more popular due to reduced cost, lower harmonic distortion, and higher voltage capability than the conventional switching strategy applied to inverters. Various topologies and modulation strategies have been reported for utility and drive applications. Level shifted based pulse width modulation techniques are proposed to investigate the performance of the multilevel inverter. The proposed work focuses on reducing the utilized switches so that the cost and the switching losses of the inverter do not go up and the consistent efficiency could be achieved. This paper presents the detailed analysis of these topologies. The analysis is based on the number of switches, DC sources, output level, maximum voltage, and the efficiency. As an illustration, single phase cascaded multilevel inverter topologies are simulated using MATLAB/SIMULINK and the experimental results demonstrate the viability of these inverters.
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Hybrid Cascaded MLI topology using Ternary Voltage Progression Technique with Multicarrier Strategy
Venugopal, Jamuna,Subarnan, Gayathri Monicka The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
A major problem in conventional multilevel inverter is that an increase in power semiconductor switches causes an increase in cost and switching losses of the inverter. The multicarrier strategy adopted for the multilevel inverters has become more popular due to reduced cost, lower harmonic distortion, and higher voltage capability than the conventional switching strategy applied to inverters. Various topologies and modulation strategies have been reported for utility and drive applications. Level shifted based pulse width modulation techniques are proposed to investigate the performance of the multilevel inverter. The proposed work focuses on reducing the utilized switches so that the cost and the switching losses of the inverter do not go up and the consistent efficiency could be achieved. This paper presents the detailed analysis of these topologies. The analysis is based on the number of switches, DC sources, output level, maximum voltage, and the efficiency. As an illustration, single phase cascaded multilevel inverter topologies are simulated using MATLAB/SIMULINK and the experimental results demonstrate the viability of these inverters.
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Santhoshini Priya Thomas,Hameed Hussain Ahmed Mansoor,Monicka Kullappan,Vadivel Sethumathavan,Balasubramanian Natesan 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
In recent days, semiconductor photocatalysis for the advanced water treatment of organic contaminants has beenconsidered as an efficient and attractive technology. This papers deals with the synthesis, characterization, and study of zetapotential effect of chitosan doped cerium oxide beads (CCB) for the photocatalytic decolorization of cationic dye, methyleneblue (MB) under visible light irradiation. The CCB were successfully synthesized through sol-gel method and furthercharacterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electronmicroscopy (SEM). The SEM images show that cerium oxide nanoparticles were profoundly embedded on the chitosanmaterial. CCB exhibited higher photocatalytic activity with 97.75 % after 210 min of decolorization. Decolorization of MBusing CCB was analyzed at different intervals of time under visible light irradiation using UV-Vis spectroscopy. The rate ofMB decolorization under visible light irradiation follows the pseudo first order kinetics using Langmuir-Hinshelwood model. Zeta potential of CCB were analyzed for aqueous solutions of chitosan dispersion over a pH range of 2 to 8.
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