Abstract
As the demand for high voltage, high power inverters are increasing and there is a problem of connecting a power semiconductor switch directly to a high voltage network. As a part of this the multilevel inverters had been introduced. As a part of this, several researches had been done for the development of multilevel inverters. The commercially available and extensively studied topologies for multilevel voltage output are Neutral Point Clamped (NPC), Cascaded Half Bridge (CHB) and Flying Capacitor (FC) converters. However, with these existing topologies, there is a significant increase in the number of power switches and passive components. Thus it leads to more complex control circuitry and overall cost of the system increase with increase in the output levels. In this paper, a novel multilevel inverter is proposed in which it employs additive and subtractive topology to get higher output levels. This approach significantly reduces the number of power switches needed as compared to existing topology. The present developed multilevel inverter can generate only five voltage levels. With this proposed topology the multilevel inverter can be modified to nine-level inverter. Moreover modified hybrid multicarrier Pulse Width Modulation (PWM) technique can be implemented in the proposed multilevel inverter in order to obtain uniform switch utilization and lower THD. An appropriate modulation scheme is presented and also the proposed concept is analyzed through simulation studies.
Highlights
In the recent technologies, multilevel voltage source inverters have emerged as a viable solution for the conversionHow to cite this paper: Prasannamoorthy, V., Sundaramoorthi, P. and Jacob, M. (2016) A Novel Multilevel Inverter Employing Additive and Subtractive Topology
This paper presents a novel multilevel topology which is capable of obtaining all additive and subtractive combinations of input Direct Current (DC) levels in the output waveform
With the proposed topology current output waveform and its corresponding harmonic spectrum are shown in Figure and Figure and it is noticed that load current waveform has Total Harmonic Distortion (THD) of 2.97%
Summary
Multilevel voltage source inverters have emerged as a viable solution for the conversion. By increasing the number of levels we can enhance the quality of multilevel waveform It adversely increases the number of power semiconductor devices and accompanying gate driver circuits. A detailed study of this topology is done in this paper In this topology the number of levels developed mainly depends upon the DC source arrangement. This approach significantly reduces the number of power switches and gate driver circuits needed as compared to the DC Source topology. As a disadvantage with the existing DC Source topology it needs 10 switches and 4 DC sources in order to develop a nine-level inverter. The detailed study of the proposed topology is done in this paper with a nine-level multilevel inverter [2]
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