Efficiency Improvement of Three-Phase Cascaded H-Bridge Multilevel Inverters for Photovoltaic SystemsReportar como inadecuado




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International Journal of Photoenergy - Volume 2016 2016, Article ID 2162190, 10 pages -

Research ArticleNational Electronics and Computer Technology Center NECTEC, Pathumthani 12120, Thailand

Received 1 March 2016; Accepted 15 May 2016

Academic Editor: Santolo Meo

Copyright © 2016 Nuntawat Thitichaiworakorn et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Medium-scale photovoltaic PV systems using cascaded H-bridge multilevel inverters have a capability to perform individual maximum power point tracking MPPT for each PV panel or each small group of panels, resulting in minimization of both power losses from panel mismatch and effect of partial shading. They also provide high power quality, modularity, and possibility of eliminating dc-dc boost stage and line-frequency transformer. However, each PV panel in the system is subjected to a double-line-frequency voltage ripple at the dc-link which reduces the MPPT efficiency. This paper proposes a dc-link voltage ripple reduction by third-harmonic zero-sequence voltage injection for improving the MPPT efficiency. Moreover, a control method to achieve individual MPPT control of each inverter cell is also presented. The validity and effectiveness of the proposed methods were verified by computer simulation.





Autor: Nuntawat Thitichaiworakorn, Nattapon Chayopitak, and Natchpong Hatti

Fuente: https://www.hindawi.com/



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