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

This paper presents performance features of Symmetric and Asymmetric Cascaded Multilevel inverter. Both the Phase shifted and level shifted multicarrier pulse width modulation (MCPWM) technique are used in MLI. The best harmonic performance is improved by Level-shifted multicarrier modulations technique . The objective of this work to propose MCPWM Technique for multilevel inverter with equal and unequal DC sources. The Performances indices like Total Harmonic Distortion (THD), reduction of switches and number of DC Sources is considered. An appropriate method to achieve the MC modulation technique is also presented in this paper.

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WTHD minimisation in hybrid multilevel inverter using biogeographical based optimisation

Archives of Electrical Engineering ◽

10.2478/aee-2014-0015 ◽

2014 ◽

Vol 63 (2) ◽

pp. 187-196

Author(s):

R. Kavitha ◽

Rani Thottungal

Keyword(s):

Lower Order ◽

Harmonic Distortion ◽

Transcendental Equation ◽

Multilevel Inverter ◽

Total Harmonic Distortion ◽

Harmonic Elimination ◽

Selective Harmonic Elimination ◽

Simulation Results ◽

Cascaded Multilevel Inverter ◽

Inverter Topology

Abstract Harmonic minimisation in hybrid cascaded multilevel inverter involves complex nonlinear transcendental equation with multiple solutions. Hybrid cascaded multilevel can be implemented using reduced switch count when compared to traditional cascaded multilevel inverter topology. In this paper Biogeographical Based Optimisation (BBO) technique is applied to Hybrid multilevel inverter to determine the optimum switching angles with weighted total harmonic distortion (WTHD) as the objective function. Optimisation based on WTHD combines the advantage of both OMTHD (Optimal Minimisation of Total Harmonic Distortion) and SHE (Selective Harmonic Elimination) PWM. WTHD optimisation has the benefit of eliminating the specific lower order harmonics as in SHEPWM and minimisation of THD as in OMTHD. The simulation and experimental results for a 7 level multilevel inverter were presented. The results indicate that WTHD optimization provides both elimination of lower order harmonics and minimisation of Total Harmonic Distortion when compared to conventional OMTHD and SHE PWM. Experimental prototype of a seven level hybrid cascaded multilevel inverter is implemented to verify the simulation results.

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Multi Carrier based Multilevel Inverter with Minimal Harmonic Distortion

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v6.i2.pp356-361 ◽

2015 ◽

Vol 6 (2) ◽

pp. 356 ◽

Cited By ~ 2

Author(s):

V.Jamuna Venkatesan ◽

Gayathrimonicka Subarnan

Keyword(s):

Pulse Width ◽

Pulse Width Modulation ◽

Harmonic Distortion ◽

Multicarrier Modulation ◽

Multilevel Inverter ◽

Total Harmonic Distortion ◽

Multilevel Inverters ◽

Cascaded Multilevel Inverter

<p>This paper presents performance features of Asymmetric Cascaded Multilevel inverter. Multilevel inverters are commonly modulated by using multicarrier pulse width modulation (MCPWM) techniques such as phase-shifted multicarrier modulation and level-shifted multicarrier modulation. Amongst these level-shifted multicarrier modulations technique produces the best harmonic performance. This work studies about multilevel inverter with unequal DC sources using level shifting MCPWM technique. The Performances indices like Total Harmonic Distortion (THD), reduction of switches and number of DC Sources are considered. A procedure to achieve the appropriate level shifting is also presented is this paper.</p>

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Modified Cascaded H-Bridge Multilevel Inverter using Trinary DC source

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i2.24.11998 ◽

2018 ◽

Vol 7 (2.24) ◽

pp. 55

Author(s):

Anuja Prashant Diwan ◽

N Booma Nagarajan ◽

T Murugan ◽

S Ashrafudeen ◽

G J. Jenito Paul

Keyword(s):

Output Voltage ◽

Single Phase ◽

Harmonic Distortion ◽

Multilevel Inverter ◽

Total Harmonic Distortion ◽

Voltage Source ◽

Matlab Simulink ◽

Switching Losses ◽

Switching Pattern ◽

Cascaded Multilevel Inverter

In this paper, single phase nine level cascaded multilevel inverter using trinary voltage source is described. Normally for getting nine level MLI output, four H-Bridges are required. But in proposed method, nine level output is achieved by using two H-Bridges only. Performance of Multilevel inverter is improved by using modular switching pattern. This method reduces the number of switches to the half and thus reduces switching losses. Since the number of levels at the output voltage is increased, Total Harmonic Distortion (THD) gets reduced significantly. This presents simple configuration is simple and can be controlled easily. MATLAB-SIMULINK is used to validate the results of proposed technic, simulation is carried out using. The proposed method has been exhaustively compared with classical cascaded H-Bridge topology.

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