A Generalized Cascaded Multilevel Inverter Using Series Connection of Submultilevel Inverters (original) (raw)
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Topologies of Multilevel Inverter– " A Review "
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This paper presents a new family of cascaded multilevel inverters (CMLIs) which can generate a considerable number of output voltage levels with minimum number of required accompanying switching devices. Conceptually, each stage of proposed CMLI is composed of using a novel capacitor-based unit including two floating capacitors, one embedded dc voltage source and three power switches. In this case, the balanced voltage of integrated capacitors can be precisely provided as self-voltage balancing without using any auxiliary circuits, close loop systems and intricate modulation techniques. In addition, to reach different number of output voltage levels, four different algorithms pertaining to the symmetrical, binary asymmetrical, trinary asymmetrical and also hybrid patterns for determining the magnitude of isolated dc voltage sources are presented. Hereby, proposed hybrid structure is capable of working under mixed switching frequency without aiming the conventional full H-Bridge cell. Therefore, a high quality of output waveforms with reduced switching devices as well as power loss dissipation can be alternatively achieved. To confirm the validity of proposed CMLI, a complete comparison with several recently presented topologies besides several simulation and experimental results based on trinary asymmetrical and hybrid evolved structures will be also given.
A Comparative Study between Different Types of Multilevel Inverter
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.
Review of Multilevel Inverters and Their Control Techniques
European Journal of Engineering Research and Science, 2020
Multi-level inverter is attaining higher AC power using a series of power semiconductor switches with numerous lower voltage DC sources to implement the power conversion by synthesizing a staircase voltage waveform. Sources like super capacitors, batteries, solar panels and other renewable energy voltage sources make up the multiple DC voltage sources. This work looks at the advantages and likely disadvantage of multi-level inverter, highlighting some of the shortfalls of existing inverter topologies while considering the effects of emerging Hybrid MLI Topologies. Hence this review paper proposes a distinctive seven level cascaded H-bridge multi-level inverter configuration in which the POD PWM technique is adopted. This design would potentially redress the problems inherent in other inverter circuit topologies reviewed.
International Journal on Electrical Engineering and Informatics, 2017
This paper discusses the difference between the three fundamental types of multilevel inverter (MLI) topologies, which are the neutral-point-clamped, the flying capacitors and the cascaded H-bridges. The sinusoidal pulse width modulation technique was used to simulate the output voltages and currents of the MLI inverters. The total harmonic distortion (THD) was estimated for each topology and each voltage level. Moreover, the simulation results indicate that the cascaded structure exhibited a lower THD value even when increasing the number of the output voltage. Furthermore, a new key parameter was defined as cost efficiency factor and used to compare the three topologies. Evaluation results of this factor indicate that the cascaded structure was the most advantages as it reduces stress effect on the inverter switches by eliminating the power diodes and capacitors.
Analysis of Different Topologies of Multilevel Inverters
Multilevel inverters are very popular and have many applications in electric utility and for industrial drivers. As the number of levels in multilevel inverter increases, THD decreases accordingly. The paper compares three different topologies of inverters (Diode clamped inverter, Flying capacitor inverter and Cascaded H-bridge inverter). The comparison is done with respect to cost, power losses and THD. MOSFETs and IGBTs are used a switching devices for analysis. Tradeoff between the power losses and cost is also discussed in this paper. To select a multilevel inverter is a tradeoff between cost, complexity, losses and THD. The most important part is to decide which one is more important.
Recently multilevel inverters are emerged as very important factor in high power and medium voltage application. Number of inverter topologies have been introduced and used for various applications. Among these inverters cascaded MLI is used because of its advantages over other MLIs. Different control techniques are available to control these inverters. Simulation outputs of three phase five level cascaded H-Bridge, Diode clamped, Flying capacitor MLIs are analyzed in MATLAB software.
International Journal of Ambient Energy, 2017
In this paper, a developed topology for multilevel voltage source inverters is proposed. The suggested modular configuration consists of series-connected several units, which can be applied as symmetric and asymmetric inverters. In asymmetric mode, different solutions are suggested to generate increased number of output voltage levels. In multilevel inverters, the number of required circuit elements determines total cost, circuit size, installation area, complexity of control scheme and reliability. The comparison study among the proposed inverter in all presented algorithms, cascaded H-bridge (CHB) inverter and recently proposed converters, confirm that the proposed inverter uses reduced number of circuit element. In order to show the practicability of the proposed converter a prototype of the proposed structure is implemented and tested. The simulation and experimental results are in good agreements with each other indicating the effectiveness of the proposed inverter.