A centroid-based PWM switching technique for full-bridge inverter applications

This study develops a pulse width modulation (PWM) strategy with a view to achieve explicit control of voltage and accrue a minimum total harmonic distortion in a multilevel inverter (MLI) of any preferred level. The multi objective digital formulation tailors to facilitate discrimination of pulses for various levels and equalise the switching losses in all the power switches in the MLI. The philosophy of the method centres to calculate the pulses for the desired target fundamental output voltage based on equal area criteria. It excludes the need for a carrier in the generation of the PWM pulses through a process of matching the output level with the sectionalised dc levels and travels to determine the switching instants using mathematical relations. It includes simulation results from a MATLAB platform for a seven level MLI and avails the use of a field programmable gate array-based prototype to validate the findings.

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“…The pulses are positioned in the centroid of the sample wave area [36, 37] after determining the pulse interval by equating the area of A 1 and

A_{1}^{^{normal′}}

in the same sampling/pulse interval, as indicated in Fig. 2.…”

Section: Proposed Methodologymentioning

confidence: 99%

Carrierless pulse width modulation strategy for multilevel inverters

Thamizharasan¹,

Sudha²,

Baskaran³

et al. 2015

IET Power Electronics

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Simulation and implementation of a harmonics suppression technique for a single-phase full-bridge converters

Chuang

Chiu

et al. 2023

Journal of the Chinese Institute of Engineers

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Performance of Single Phase Full Wave Rectifier Controlled by PWM

Asiri

Shwehdi

2007

2007 Canadian Conference on Electrical and Computer Engineering

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Semiconductor switching devices produce significant harmonic voltages as they chop voltage waveform during the transition between conducting and cutoff stages. The diode bridge rectifiers are considered as a major contributor to the power system harmonics and the consequences are varying from components overheating to communication interference. The scope of this paper is the harmonic voltages at the output of full wave rectifier and the way to control the distribution of the components of Fourier series. A PWM based switching technique is proposed to shift the low-order harmonics to higher frequencies away from the fundamental to be easily filtered. The paper also presents a comparison with Pspice simulation and experimental values.

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A centroid-based PWM switching technique for full-bridge inverter applications

Cited by 8 publications

References 12 publications

Carrierless pulse width modulation strategy for multilevel inverters

Carrierless pulse width modulation strategy for multilevel inverters

Simulation and implementation of a harmonics suppression technique for a single-phase full-bridge converters

Performance of Single Phase Full Wave Rectifier Controlled by PWM

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