Comparative Study of Three level and Five level Inverter

This paper analyzed three-level Cascaded H-bridge Multilevel Inverter (CHMLI) utilizing two modulation techniques namely Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM). The performance and the output of CHMLI in terms of Total Harmonic Distotion (THD) % and circuits complexity were compared. The simulations models were constructed using MATLAB/SIMULINK. The results showed the CHMLI produced the lowest THD contents and utilized fewer components. Moreover, the SVPWM produced less THD than SPWM.

IRJET, 2022

This paper compares between four different topologies of cascaded H-bridge multilevel inverter. Inverter can be defined as a power electronic device which can convert dc to ac at specified output voltage and frequency. Multilevel inverters are the preferred choice of industry for application in high voltage and high power. The basic advantage of a multilevel inverter is that it can give high power at the output while working under medium voltage source. It does so with the help of multiple dc sources at the input. The main merits of the paper are Comparative Study of Different Types of Multilevel Inverter and also study on minimizing the total harmonic distortion which will help the designer to design an appropriate multilevel inverter.

Simulation of cascaded H-Bridge multilevel inverter for different levels is presented in this paper. Higher power levels can be obtained from utilizing lower voltage levels which was the theory proposed over thirty years ago. Conversion of DC to AC having desired output voltage and frequency can be obtained from two types of inverters which are single level and multilevel inverter (MLI). Amongst all MLI topologies Cascaded H-Bridge type is take into consideration for this paper. Advantages of MLI include minimum harmonic distortion, reduced EMI and it can be operated on different voltage levels [1]. Here IGBT's are taken as switches which are to be controlled by providing proper switching angles that is generated by any optimization techniques. Here genetic algorithm is taken as the optimization method and switching angles are derived. Simulation of 5-level, 7-level, 11-level cascaded multilevel inverter is presented here and the output waveforms were observed using MATLAB.

Multilevel inverter is a power electronic device that has become more popular in electric high power and medium voltage applications. Multilevel inverters have unique structure which makes it possible to reach high voltages with fewer harmonics content and lower Electromagnetic interference (EMI). The harmonic content of the output voltage waveform reduces as the number of output voltage increases. This paper proposed a three-phase cascaded multilevel inverter using less number of switches. The proposed system uses the topology of Asymmetrical cascade H-Bridge Multilevel inverter with separate not equal dc sources for the switching circuit. As the number of step level for voltage increases in the output voltage waveform has more steps, this produces a desired output waveform with low harmonic distortion. Application of cascaded multilevel inverter for high power equipments in industry has become popular because of its high-quality output waveform. The method has been designed as a twenty seven level three phase cascaded multilevel inverter and compares the Total harmonic distortion. The models discussed in this paper have been simulated on Matlab/Simulink software and the relevant Total harmonic distortion (THD) has been determined by Fast Fourier Transformation (FFT) analysis of the output waveform by the software.

International Journal of Applied Power Engineering (IJAPE), 2025

Multi-level inverters (MLIs) have created a new revolution in high-power and medium-voltage applications in industry and research. In recent years, cascaded multi-level inverters have gained significant interest due to their ability to generate high-quality output waveforms with reduced total harmonic distortion (THD). This paper discusses the analysis and simulation of 7-level and 9-level cascaded H-bridge multi-level inverters using mathematical models and simulation tools. The proposed research puts emphasis on evaluating the performance and control strategies of these inverters. The control strategies, including pulse width modulation (PWM) techniques, are discussed in depth, with a focus on their effect on output waveform quality and reduction of THD. The simulation results are compared to showcase the advantages offered by the cascaded multi-level inverters in terms of waveform quality. The findings demonstrate the superior performance and power quality advantages offered by these multilevel inverters compared to traditional two-level inverters. Additionally, a passive LC filter is designed and implemented along with a multi-level inverter configuration that helps to keep the THD within the limits specified by IEEE standards.

There are many limitations in extracting power from renewable energy resources. To minimize the power demand and scarcity we have to improve the power extracting methods. Multilevel inverter is used to extract power from solar cells. It synthesizes the desired ac output waveform from several dc sources. This paper focuses on improving the efficiency of the multilevel inverter and quality of output voltage waveform. Seven level reduced switches topology has been implemented with only seven switches. Fundamental Switching scheme and Selective Harmonics Elimination were implemented to reduce the Total Harmonics Distortion (THD) value. Selective Harmonics Elimination Stepped Waveform (SHESW) method is implemented to eliminate the lower order harmonics. Fundamental switching scheme is used to control the power electronics switches in the inverter. The proposed topology is suitable for any number of levels. The harmonic reduction is achieved by selecting appropriate switching angles. It shows hope to reduce initial cost and complexity hence it is apt for industrial applications. In this paper third and fifth level harmonics have been eliminated. Simulation work is done using the MATLAB software and experimental results have been presented to validate the theory.

TJPRC, 2014

Multilevel inverters are becoming more popular in the power conversion systems for high power and power quality demanding applications. The MATLAB based simulation on simulink platform is presented for three various topologies of Single Phase cascaded H-bridge Multilevel Inverter for 5, 7 and 9 levels. A detailed comparison of various Topologies is presented in the paper based on number of power devices used, Total Harmonic Distortion, average voltage stress, maximum voltage stress and utilization factor. The Topology I and Topology II are cheap and efficient because number of conducting power devices are less as compared to the conventional Topology.

2015 Annual IEEE India Conference (INDICON), 2015

This paper presents a simulation of 5-level Cascaded Diode Clamped Half Bridge (CDCHB) Inverter using Hybrid Level-shifted and Phase-shifted (HLP) Sinusoidal Pulse Width Modulation (SPWM) technique. The output voltage, output current and voltage across each device, and the THD of the CDCHB inverter are obtained. Further, the paper aims to perform a comparison between 5-level CDCHB inverter with Cascaded H-Bridge (CHB) inverter. The comparison is done on the basis of the peak inverse voltage of each device, output power and the THD obtained with both the inverters. Simulations are done in MATLAB Simulink and results obtained are shown.

2018

This paper a contrivance of inverter of cascaded type is presented in which the number of switches needed is lowered compared to usual used inverters. In this paper, concept which discussed are THD and low dv/dt for multilevel converters . This topology is also work on high power quality and lower harmonic components. And also better work for electromagnetic consistence and low dv/dt as well as lower switching losses. This Theory also presented different voltage source in generating all voltage levels as positive or negative is verified by using the MATLAB/SIMULINK results of a 7,13 &19 -level 1-phase &3-phase inverter. This paper main focused on T.H.D, dv/dt losses, single phase and three phase 7 level, 13 level, 19 level inverter

International Journal of Engineering & Technology

Recently, almost all industrial devices are mostly built on electronic devices which are precisely sensitive to harmonic. In order to meet the requirement from the industries demand aimed at a free-harmonics and high power rating source is remarkably increased in past few years. An inverter which a device or electric circuit that convert direct current to alternating current is one of the electronic devices that give concern to researchers for improvement of generating a neat power source. The inverter can be categorized into a single level and multilevel inverter. As compared to single level inverter, multilevel inverter offers minimum harmonic distortion and higher power output. This paper presents a model of multilevel inverter using 7-level Cascaded H-Bridge of multilevel DC-AC inverter to reduce total harmonic distortion with different sinusoidal pulse width modulation such as phase disposition and phase opposition disposition. Simulation output of single phase multilevel inver...