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International Journal of Photoenergy
Volume 2012, Article ID 760791, 8 pages
http://dx.doi.org/10.1155/2012/760791
Research Article

Grid-Connection Half-Bridge PV Inverter System for Power Flow Controlling and Active Power Filtering

Department of Electronic Engineering, National Kaohsiung First University of Science and Technology, Nanzih, 1, University Road, Yuanchau, Kaohsiung 824, Taiwan

Received 19 March 2012; Accepted 11 May 2012

Academic Editor: G. N. Tiwari

Copyright © 2012 Chih-Lung Shen and Jye-Chau Su. 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

A half-bridge photovoltaic (PV) system is proposed, which can not only deal with bidirectional power flowing but also improve power quality. According to varying insolation, the system conditions real power for dc and ac loads to accommodate different amounts of PV power. Furthermore, the system eliminates current harmonics and improves power factor simultaneously. As compared with conventional PV inverter, the total number of active switches and current sensors can be reduced so that its cost is lower significantly. For current command determination, a linear-approximation method (LAM) is applied to avoid the complicated calculation and achieve the maximum power point tracking (MPPT) feature. For current controlling, a direct-source-current-shaping (DSCS) algorithm is presented to shape the waveform of line current. Simulation results and practical measurements also demonstrate the feasibility of the proposed half-bridge PV system.