A Comparative Study of Various Multi-Level Inverter Based on Multi-Cell (original) (raw)
Related papers
review study of multilevel inverter
This paper Presents design and simulation of a cascade H bridge multilevel inverter using sinusoidal pulse width modulation technique. The purpose of multilevel inverter is to generate stair case sinusoidal pulse using different DC Supply. In this paper we generate carrier based SPWM scheme using PD,POD,APOD compare it for five level and seven level by doing FFT analysis in order to find optimized output voltage quality. The MATLAB, Simulink result shows that seven level inverter voltages has less total harmonic distortion in comparison with five level inverter.
Comparative Study of Three level and Five level Inverter
This paper analyses and compares the different cascaded H-Bridge multilevel inverter used for dc to ac power conversion. The simulation of multilevel inverters is done in MATLAB/SIMULINK software.The activepoweroutput,reactive power output and Total Harmonic Distortion (THD) in output voltage produced in 3-level and 5-level inverters are obtained and compared.It was observed that THD in 5-level inverteris less as compared to 3-level inverter & THD in 7-level inverter is less as compared to 3-level and 5-level inverter. KEYWORDS: Cascaded H-Bridge Multilevel Inverter,Three level inverter.Five level inverter,Comparison. I.INTRODUCTION The use of renewable energy sources is increasing to supply the increasing demand of electricity due to urbanisation. Solar energy produces dc power which needs to be converted into ac for further applications. Conversion of dc power to ac is done using cascaded H bridge multilevel inverter with less THD. The high power cascaded H bridge multilevel inverter should be analysed with respect to its output active power, reactive power and THD in output voltage. This study will help the design engineer in selecting the appropriate multilevel inverter for required application. Multilevel inverters are classified as current source inverter and voltage source inverter. In case of multilevel current source inverter, it was observed that if there is short circuit in the circuit, the fault current will be very high further damaging the other equipment's connected in the circuit. Therefore multilevel voltage source inverters are more commonly used [3].Multilevel voltage source inverters are classified into three main categories as (i) cascaded H-bridge multilevel inverter, (ii) Neutral point clamped multilevel inverter and (iii) Flying capacitor multilevel inverter. Cascaded H bridge multilevel inverter is more commonly used because it gives high output voltage, reliability, power levels and simplicity of control. II.CASCADED H-BRIDGE MULTILEVEL INVERTER The cascaded H-Bridge multilevel inverter are the most advanced and important method of power electronic converters that analyses output voltage with number of dc sources as inputs.As compared to neutral point clamped multilevel inverter and flying capacitor multilevel inverter,the cascaded H-Bridge multilevel inverters requires less number of components and it reaches high quality output voltage which is close to sinewave. By increasing the number of output levels the total harmonic distortion in output voltage can be reduced.In cascaded H-Bridge multilevel inverterrequired AC output voltage is obtain by synthesizing number of DC sources.The number of H-Bridge units with different DC sources is connected in series or cascade to produce cascaded H-Bridge multilevel inverter[4]. III.SINGLE PHASE 3-LEVEL CASCADED H-BRIDGE MULTILEVEL INVERTER Fig 1 shows Single phase Three level Cascaded H-Bridge inverter consisting of single isolated DCsource,four IGBT switches& R-L load. The result of output voltage waveform of three level multilevel inverter is shown in fig 3.consists of three levels 0,+Vdc,-Vdc[1].
The multilevel inverters have important place in the modern high voltage applications because of their high quality output in all load conditions. Number of Power electronic switches and DC voltage sources are the important factors of the inverter which define output levels and quality. Cascaded multilevel inverters are mostly capable of handling more power in the output side thus these inverters are preferred for industrial applications. This paper presents a modified cascaded multilevel inverter with lessened number of power semiconductor switches compared with conventional cascaded multilevel inverter and also it presents various multicarrier pulse width modulation (MCPWM) techniques based on modified cascaded multilevel Inverter. These techniques will reduce the harmonic distortions present in the output voltage waveform. The proposed multilevel inverter produces thirteen-level using symmetrical sub-multilevel cells. This paper focus on to improve the ac output voltage with lower harmonic distortion and reduce the total harmonic distortion (THD). The proposed circuit have been simulated with help of MATLAB/SIMULINK.
2017
Multilevel inverters , covering a wide power range are currently considered as a better industrial solution for high dynamic performance and power-quality demanding applications. In this converter ,for specific time intervals fewer switches will be conducting so switching loss is also reduced . To generate gating signal Phase Disposition Pulse Width Modulation (PDPWM) technique is used here. This paper represents overall THD for different levels and different carrier frequencies. In this paper switching loss,conduction loss of inverter have been discussed and hence inverter efficiency can be calculated. Simulation studies are presented by using MATLAB/SIMULINK.
A novel multilevel inverter with reduced switch count
International Journal of Advances in Applied Sciences (IJAAS), 2019
This paper presents a multilevel inverter with reduced number of switches to produce a five level output. PWM technique (pulse width modulation) has been used to trigger the MLI switches. It gives reduced harmonic. This proposed topology is connected with R-load and RL-load. Four signals are generated for switching on the multilevel inverter (MLI) switches by comparing four level triangular waveform with sine wave. In this proposed topology two switches are reduced from the conventional Cascaded five level inverter. The simulation analysis has been done by MATLAB/SIMULINK.
Design and Simulation of Five Level Cascaded Inverter Using Multilevel Sinusoidal PWM Strategies
The project we have undertaken is “Design and Simulation of Five Level Cascaded Inverter Using Multilevel Sinusoidal PWM Strategies”. Five Level Cascaded Inverter as compared to single level inverter have advantages like minimum harmonic distortion reduced EMI/RFI generation and can operate on several voltage levels. The Multi-level inverter is to synthesize a near sinusoidal voltage from several levels of dc voltages. As number of levels increases, the synthesized output waveform has more steps, which provides a staircase wave that approaches a desired waveform. Also, as steps are added to waveform, the harmonic distortion of the output wave decreases, approaching zero as the number of voltage levels increases. Three phases two level inverter is one of the popular multi-level inverter, designed using Bidirectional chopper cells. Multi-level inverter is being utilized for multipurpose applications such as active power filters, static VAR compensator and machine drives for sinusoidal and trapezoidal current applications. The active power filters are modelled with the inverters and suitable switching control strategies (PWM technique) to carry out harmonic elimination.
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.
Design and Validation of a Generalized Multilevel Inverter with Simplified Switching Technique
Electric Power Components and Systems, 2020
This paper proposes a generalized 3-phase cascaded multilevel inverter (CMLI) along with a simplified space vector pulse width modulation (SVPWM) based on 2-level inverter (2LI) topology. While conventional cascaded H-bridge inverters (CHBIs) call for a number of DC sources which increase the cost and complexity of their implementation, the proposed CMLI requires one DC source only. On the other hand, the complexity of SVPWM lies in the switching diagram that consists of a large number of triangles comprising uneven numbers of switching vectors. The generalized 3-phase CMLI proposed in this paper is aimed at reducing the number of switching vectors of each triangle. The hypothesis of the proposed CMLI-SVPWM is firstly illustrated through extensive simulation analysis using MATLAB/ SIMULINK software. Feasibility of the proposed inverter is then validated through experimental measurements on a hardware prototype. Results reveal the superiority of the proposed inverter over existing ones in terms of the quality of the output voltage and current waveforms and the overall efficiency.
Design of novel cascaded multilevel inverter by series of sub multilevel inverters
This paper proposed novel multilevel inverter with low number of switches. Multilevel inverters are applicable for high power purpose in industries which become very popular. When compared to two level inverters these multilevel inverters produces good quality of output wave from. In such a way that, at first new proposed topology which as sub multilevel inverter is designed after that cascaded connection of sub multi level inverters called as novel cascaded multilevel inverter is proposed. This proposed novel cascaded multilevel inverter uses less number of switching devices. Separate attention optimal structure has been achieved by considering in different aspects such as number of switching devices, number of dc voltage sources and standing voltages on switching devices. This proposed novel cascaded multilevel inverter analyzed in symmetric and asymmetric forms of topologies which were compared with other multilevel inverter topologies suppose normal H bridge multilevel inverter by considering number components such as number of switches & IGBTs etc. The validity of proposed multilevel inverter verified with computer simulation. asymmetric; high quality wave form.
A Novel Topology Of Multilevel Inverter With Reduced Number Of Switches And DC Sources
International Journal of Power Electronics and Drive Systems (IJPEDS), 2014
This paper introduces new topology of cascaded multilevel inverter, with considerable reduction in the number of switches and DC voltage sources. The proposed topology is based on asymmetrical multilevel inverter which produces 21 levels of output with the use of 11 unidirectional switches, 3 diodes and 4 DC voltage sources. The advantages of this topology are reduction in the number of switches (2 nos.) and gate driver circuits (2 nos.), reduction in the number of DC sources (2 nos.) also cost, complexity, and space required for hardware is reduced without sacrificing the quality output of the inverter. To reduce the THD further Level shifting SPWM techniques such as PD, POD & APOD are used and comparison is shown on the basis of THDs obtained from the above SPWM techniques. Frequency of carrier waves is 1KHz, and modulation index is 1.0. To validate the proposed topology the circuit is simulated and verified by using MATLAB/Simulink.