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Energies 2016, 9(12), 1005; doi:10.3390/en9121005

Augmented Nonlinear Controller for Maximum Power-Point Tracking with Artificial Neural Network in Grid-Connected Photovoltaic Systems

†,* , †,* ,
,
and
School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Senthilarasu Sundaram
Received: 20 October 2016 / Revised: 21 November 2016 / Accepted: 24 November 2016 / Published: 30 November 2016

Abstract

Photovoltaic (PV) systems have non-linear characteristics that generate maximum power at one particular operating point. Environmental factors such as irradiance and temperature variations greatly affect the maximum power point (MPP). Diverse offline and online techniques have been introduced for tracking the MPP. Here, to track the MPP, an augmented-state feedback linearized (AFL) non-linear controller combined with an artificial neural network (ANN) is proposed. This approach linearizes the non-linear characteristics in PV systems and DC/DC converters, for tracking and optimizing the PV system operation. It also reduces the dependency of the designed controller on linearized models, to provide global stability. A complete model of the PV system is simulated. The existing maximum power-point tracking (MPPT) and DC/DC boost-converter controller techniques are compared with the proposed ANN method. Two case studies, which simulate realistic circumstances, are presented to demonstrate the effectiveness and superiority of the proposed method. The AFL with ANN controller can provide good dynamic operation, faster convergence speed, and fewer operating-point oscillations around the MPP. It also tracks the global maxima under different conditions, especially irradiance-mutating situations, more effectively than the conventional methods. Detailed mathematical models and a control approach for a three-phase grid-connected intelligent hybrid system are proposed using MATLAB/Simulink. View Full-Text
Keywords: photovoltaic (PV) systems; DC/DC converter; maximum power-point tracking (MPPT); artificial neural network (ANN); non-linear controller; augmentation system photovoltaic (PV) systems; DC/DC converter; maximum power-point tracking (MPPT); artificial neural network (ANN); non-linear controller; augmentation system
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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. (CC BY 4.0).

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MDPI and ACS Style

Ma, S.; Chen, M.; Wu, J.; Huo, W.; Huang, L. Augmented Nonlinear Controller for Maximum Power-Point Tracking with Artificial Neural Network in Grid-Connected Photovoltaic Systems. Energies 2016, 9, 1005.

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