A Cascaded NPC/H- Bridge Inverter with Superior Harmonic Content and Improved DC Link Voltage Control for Grid Interface Application
American Journal of Management Science and Engineering
Volume 2, Issue 5, September 2017, Pages: 89-105
Received: May 2, 2017; Accepted: May 13, 2017; Published: Oct. 23, 2017
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Tom Wanjekeche, Department of Electrical Engineering, University of Namibia, Ongwediva, Namibia
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Modeling of Cascaded Multilevel converter has put more emphasize on conventional cascaded H- bridge inverter. First a new phase shifted SPWM control algorithm for cascaded NPC/H-bridge inverter is proposed. Its Superior harmonic suppression is verified by comparing its harmonic spectrum with that of the conventional multicarrier approach. For DC- bus capacitor voltage control, a new, balance circuit is proposed. Because of its modularity, it is simple and can be easily incorporated in cascaded inverter model with any number of levels. Feedback controller design is presented with main focus on grid voltage regulation and overall system capacitor voltage balance. The validity of grid interface model and its control strategies is substantially confirmed by the extensive simulation results.
Harmonic Content, Cascaded NPC/H-Bridge Inverter, Grid Connected Systems, DC Link Voltage Control
To cite this article
Tom Wanjekeche, A Cascaded NPC/H- Bridge Inverter with Superior Harmonic Content and Improved DC Link Voltage Control for Grid Interface Application, American Journal of Management Science and Engineering. Vol. 2, No. 5, 2017, pp. 89-105. doi: 10.11648/j.ajmse.20170205.13
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