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Power Electronics Converters Applications And Design

Multilevel inverters (MLI) are aligned with lower harmonics and less commutation losses, which offer high power capacity. MLI is one of the best widespread converters due to its ability to eliminat...

Analysis of Cascaded Multilevel Inverter with a Reduced Number of Switches for Reduction of Total Harmonic Distortion

In this paper, a different configuration based on different DC bus voltage for a diode-clamped multilevel inverter has been presented. Two different symmetrical and asymmetrical arrangements of a four-level diode clamped inverters have been compared, in order to find an optimum arrangement with lower switching losses and optimised output voltage quality. The optimised asymmetrical arrangement has been compared with a conventional four- level inverter. The comparison results show that an asymmetrical configuration can obtain more voltage levels in output voltage with same number of component compared with the conventional four-level inverter and this will lead to the reduction of harmonic content of output voltage. A predictive current control technique has been carried out to verify the viability of new configuration. The advantages of this control method are simplicity and applicability for n-level multilevel inverters, without a significant change in the control circuit.

Comparison between symmetrical and asymmetrical single phase multilevel inverter with diode-clamped topology

In this paper, The Performance Of Cascaded Multilevel Inverter Interfaced With A Large Split Winding Alternator consists of major parts like cascaded multi level inverter and split winding alternator. Here the split winding alternator is considered as a de-rated machine. Where, the undesired response from the machine like unbalanced current response and unbalanced voltages and the transient nature of torque, are experienced by the machine ,because of the aging effect experienced by the machine so which leads to the de-rating of the winding quality of to the machine which in turn induces many harmonics in the machine leads to decrease in efficiency. There is a need to increase the system overall performance .so the special type of multi level inverter can be used to conjunction with machine so that dynamic response of the machine damped out .Major problem in interfacing such machines to the grid is the limitation imposed by the ratings of currently available switching devices in the converter. The ratings of the semiconductor devices used in the conventional two-level or threelevel VSI topologies do not support the higher power ratings necessary for the grid interface of such large machines.

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Grid Interface Of Wind Power With Large Split-Winding Alternator Using Cascaded Multilevel Inverter

Multilevel inverters area unit utilized in varied sectors, further as in domain, for medium voltage and high power applications. MLI generates the specified output within the variety of stepped waveforms with low harmonics. Various voltage levels in MLI can be used to generate alternating voltage with a step structure. With less harmonic distortion, this is similar to sinusoidal waveforms. Traditional MLI has the disadvantage of necessitating a wider range of components, which increases the quality of gate pulse generation. As a consequence, its general price rises. MLI topologies with more power switches have a higher number of harmonics in their output voltage waveform. This work proposes a cascaded H bridge MLI architecture to address these issues. This type of MLI reduces the filter requirement for the production of AC. For modern technical development in industries or power sectors cascaded MLI is used. It has many advantages over the conventional two-level inverter. This topology wants fewer elements once it's compared to the traditional topologies. The most important issue of this investigation is the simulation results of three, five, seven, and nine level Single-Phase CHBMLI, as well as their THD values. The THD is discussed for each level with the help of the simulation result. In this proposed method SPDM technique using Triangular Multiple Carrier waves is used. MATLAB/ SIMULINK software system is employed to simulate all configurations and therefore the results of every level are compared. 

Performance Analysis of a Nine Level Cascaded H-Bridge Multilevel Inverter In Comparison To Comparable Lower-Level Topologies

This paper presents a novel cascaded 9-level inverter with reduced number of switches based on a multilevel DC link inverter topology. It describes the variation in total harmonic distortion as the number of levels are increased. This topology requires fewer components when compared to conventional topologies. This work uses pulse width modulation technique with Phase Disposition Method using Triangular Multiple Carrier waves. The simulation results are carried out in SIMULINK/ MATLAB Software.

A. Tamil Maran

Papers

Performance Analysis of 9 Level Reduced Switch Cascaded Multilevel Inverter Using Phase Disposition