Abstract
The various configurations of multilevel inverter involve the use of more numbers of switching devices, energy storage devices and/or unidirectional devices. Each switching unit necessitates the add-on driver circuit for proper functionality. Cascaded H-Bridge Multilevel Inverter requires overlapped switching pulses for the switching devices in positive and negative arms of the bridge which may lead to short circuit during the device failure. This work addresses the problems in different configurations of multilevel inverter by using reduced number of switching and energy storage devices and driver circuits. In the present approach Single Switch is used for each stair case positive output and single H-Bridge for phase reversal. Driver circuits are reduced by using the property of body diode of the MOSFET. Switching pulses are generated by Arduino Development Board. The circuit is simulated using Matlab. More so, through experimental means, it is physically tested and results are analyzed for the 5-step inverter and thereby simulation is fully validated. Consequently, cycloconverter operation of the circuit is simulated using Matlab. Moreover, half bridge configuration of the multilevel inverter is also analyzed for high frequency induction heating applications.
Highlights
Multilevel inverters find applications in domestic and industrial power system
This inverter is applicable to high voltage, high power applications such as flexible AC transmission systems (FACTS) including static VAR generation (SVG), power line conditioning, series compensation, phase shifting and voltage balancing and fuel cell and photovoltaic utility interface systems [3]
In this paper Half bridge multilevel inverter is suggested for this high frequency application
Summary
Multilevel inverters find applications in domestic and industrial power system. These inverters basically convert DC power from stand alone units like solar cell, fuel cell and battery into AC power. It includes an array of switches and voltage sources, the output of which generates voltages with stepped waveforms. Each module is connected with its own DC source and by proper switching sequence of series connected H-Bridge module; stepped sine waveform is produced This inverter is applicable to high voltage, high power applications such as flexible AC transmission systems (FACTS) including static VAR generation (SVG), power line conditioning, series compensation, phase shifting and voltage balancing and fuel cell and photovoltaic utility interface systems [3]. Cascaded multilevel inverter (MLI) based on Secondary Multilevel Constituent (SMC) consisting of a series of stacked half bridge cells and an H-bridge inverter is proposed in [5] This MLI outputs higher voltage levels with the same number of switching devices. This work addresses the problem in implementing half-bridge multilevel inverter
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