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An improved perturb and observe (P&O) maximum power point tracking (MPPT) algorithm for higher efficiency

Ahmed, Jubaer; Salam, Zainal


Zainal Salam


This paper proposes a method to improve the efficiency of the P&O maximum power point tracker (MPPT) by reducing the steady state oscillation and eliminating the possibility of the algorithm to lose its tracking direction. A dynamic perturbation step-size is employed to reduce the oscillation, while boundary conditions are introduced to prevent it from diverging away from the MPP. To prove its effectiveness, the proposed P&O is compared with the conventional and adaptive P&O using the Ropp, sinusoidal and ramp irradiance tests. In addition, the performances are evaluated based on a one-day (10 h) irradiance and temperature profile. The algorithm is implemented on a buck-boost converter and benchmarked by the standard MPPT efficiency (ηMPPT) calculation. It was found that, for all the tests, the ηMPPT of the proposed P&O scheme is increased by approximately two percentage points. Besides, the proposed algorithm does not require any extra hardware components; only several lines of additional software codes are to be embedded into the conventional P&O MPPT control program.

Journal Article Type Article
Acceptance Date Apr 5, 2015
Online Publication Date Apr 20, 2015
Publication Date 2015-07
Deposit Date Dec 28, 2021
Journal Applied Energy
Print ISSN 0306-2619
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 150
Pages 97-108
Keywords Solar energy, Photovoltaic, P&O, MPPT, P–V curve, MPPT
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