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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

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 (CC BY 3.0).
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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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