Performance of the Multicarrier Sinusoidal PWM-Based Multilevel Inverter With Reduced Power Loss and Fault Diagnosis Using Wavelets Transformation: Hybrid Multilevel Inverter

Performance of the Multicarrier Sinusoidal PWM-Based Multilevel Inverter With Reduced Power Loss and Fault Diagnosis Using Wavelets Transformation: Hybrid Multilevel Inverter

Durga Prasad Garapati (Shri Vishnu Engineering College for Women, India), Jegathesan V. (Karunya Institute of Technology and Sciences, India) and Moorthy Veerasamy (Vishnu Institute of Technology, India)
Copyright: © 2018 |Pages: 45
DOI: 10.4018/978-1-5225-3935-3.ch011

Abstract

The performances of multilevel inverters (MLIs) are of high competence when compared to the conventional two-level inverters due to reduced harmonic distortions, lower electromagnetic interference, and higher dc link voltages. However, the increased number of components, complex PWM control, and voltage-balancing problem, component failure in the circuit are some of the disadvantages. The topology preferred in this chapter provides a dc voltage in the shape of a staircase which approximates the rectified shape of a commanded sinusoidal wave to the bridge inverter, which in turn alternates the polarity to produce an AC voltage with lesser total harmonic distortion. This topology requires fewer components and hence it leads to a reduction of overall cost and complexity particularly for higher output voltage levels. The component fault diagnostic procedure is developed using wavelets transform tool. Finally, the experimental prototype is developed and validated with the simulation results for different loading conditions.
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Research Background

The emergence of new semiconductor devices translates to realize high power requirements in preference to the use of multiple connected low voltage devices. Though the series connection favors to increase the voltage withstanding capacity, still the current handling phenomena infuse rhetoric issues. Besides the problem of voltage sharing during switching in tune with the variation in switching speed explodes with a larger number of devices connected in series. The theory of special gate drive circuits along with snubber networks carry relevance and add to the burden in the smooth functioning of the circuit.

The inverters fall in the category of power conversion systems that owe to synthesize the variable alternating voltage from the fixed dc input by appropriately turning on the power switches in the modular architecture. The classical two level inverters tailor to satisfy higher power applications through a single and or two devices at any point in time. The resultant shape of the voltage and current waveforms cause very large sized steps and introduce lower order harmonic content to create deleterious impact on the performance of the products.

Though a variety of filters prorogue to suppress the lower order harmonics at the output side, still the filter size keeps worrying the designers and venture to contemplate on alternatives. The enhancements in the filter configurations and the advent of active filters bring to light a fresh space for their presence in power converter circuits. However, their bulky nature and the increasing losses leave much to be desired in the role of filters especially in these areas. These are addressed with suitable power converter technology through enduring research activity.

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