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Power loss analysis of grid connection photovoltaic systems

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4 Author(s)
Wu, T.-F. ; Dept. of Electr. Eng., Nat. Chung Cheng Univ., Ming-Hsiung, Taiwan ; Chang, C.-H. ; Chang, Y.-D. ; Lee, K.-Y.

This paper presents power loss analysis of grid-connection PV systems, based on the loss factors of double line-frequency voltage ripple, fast irradiance variation, fast dc load variation, non-uniform solar cell characteristic, and limited operating voltage range. These loss factors will result in power deviation from the maximum power points (MPP). In the power loss analysis, both single-stage and two-stage grid connection PV systems are considered. The effects of these loss factors on two-stage grid-connection PV systems are insignificant due to an additional maximum power point tracker (MPPT), but it will reduce the system efficiency typically about 3%. The power loss caused by these loss factors in single-stage grid-connection PV systems is also around 3%; that is, a single-stage grid-connection PV system has the merits of saving components and reducing cost, while does not scarify overall system efficiency. Simulation results with a MATLAB software package are presented to confirm the analysis.

Published in:

Power Electronics and Drive Systems, 2009. PEDS 2009. International Conference on

Date of Conference:

2-5 Nov. 2009

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