A Novel Least Component Count Single DC-link Fed Generalized Multilevel Inverter Configuration for Three-phase High Power Isolated Grid Connected Systems

Naik, Satish B and Reddy, Ravi Prakash and Shan, S and Umanand, L and Gopakumar, K and Reddy, Subba B (2018) A Novel Least Component Count Single DC-link Fed Generalized Multilevel Inverter Configuration for Three-phase High Power Isolated Grid Connected Systems. In: 10th IEEE Annual Energy Conversion Congress and Exposition (ECCE), SEP 23-27, 2018, Portland, OR, pp. 2976-2981.

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Abstract

This paper presents a novel generalized multilevel inverter topology using a single DC link and with the least component count for high power isolated grid integration of renewable energy sources such as solar photovoltaic (PV). The topology is able to generate various voltage levels starting from 3 to `N' levels. The proposed inverter topology consists of two stages such as two-phase inverter and the Scott-T transformer. Former stage converts the DC voltage into two-phase system of electrical quantities, while the later stage converts two-phase quantities into the three phase quantities by using a Scott-T transformer. The proposed topology results in the usage of reduced active power devices and corresponding gate drives, power diodes, flying and DC-link capacitors. Main advantage of this configuration is that the topology employs only a single DC-link, and the DC-link capacitors have an inherent ability to self balance their voltages without the need of extra capacitor voltage balancing algorithms or circuits. A simple and conventionally available level shifted carrier based pulse width modulation strategy is employed for controlling the power devices. The inverter is operated in the current control mode to inject power into the grid at unity power factor. Circuit analysis along with the simulation results for a nine level grid connected operation with a lab scale power level of 1 kW is discussed in this paper.

Item Type:	Conference Paper
Series.:	IEEE Energy Conversion Congress and Exposition
Publisher:	IEEE
Additional Information:	10th IEEE Annual Energy Conversion Congress and Exposition (ECCE), Portland, OR, SEP 23-27, 2018
Keywords:	Cascaded H-bridge; full-bridge; low voltage devices; multilevel inverter; multilevel converter; pulse width modulation (PWM)
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	07 Feb 2019 04:45
Last Modified:	07 Feb 2019 04:45
URI:	http://eprints.iisc.ac.in/id/eprint/61611

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