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Energies 2012, 5(6), 1982-1997; doi:10.3390/en5061982
Article

Double-Linear Approximation Algorithm to Achieve Maximum-Power-Point Tracking for Photovoltaic Arrays

1,*  and 2
1 Department of Electronic Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 824, Taiwan 2 Department of Electrical Engineering, National Chin-Yi University of Technology, Taichung 411, Taiwan
* Author to whom correspondence should be addressed.
Received: 7 May 2012 / Revised: 12 June 2012 / Accepted: 14 June 2012 / Published: 20 June 2012
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Abstract

In this paper, a double-linear approximation algorithm (DLAA) to achieve maximum-power-point tracking (MPPT) for photovoltaic (PV) arrays is proposed. The DLAA is based on the approximation that the maximum power point varies linearly with irradiation and temperature. With the DLAA, a maximum power point can be determined instantaneously. Moreover, complicated calculations and perturbations about an optimal point can be avoided. The paper also proposes a corresponding circuit to realize the DLAA. The configuration of the DLAA circuit is simple such that it is cost-effective and can be embedded into PV arrays easily. An example of implementation of a PV power supply system with the proposed MPPT is designed and the DLAA is compared with the perturb-and-observe method. Simulated and experimental results have demonstrated the feasibility of the PV power system and verified the advantages of the proposed DLAA.
Keywords: maximum power point tracking; PV arrays; double-linear approximation algorithm maximum power point tracking; PV arrays; double-linear approximation algorithm
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.

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MDPI and ACS Style

Shen, C.-L.; Tsai, C.-T. Double-Linear Approximation Algorithm to Achieve Maximum-Power-Point Tracking for Photovoltaic Arrays. Energies 2012, 5, 1982-1997.

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