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Energies 2015, 8(11), 12363-12387; https://doi.org/10.3390/en81112318

Sliding-Mode Controller for Maximum Power Point Tracking in Grid-Connected Photovoltaic Systems

1
Instituto Tecnológico Metropolitano (ITM), Calle 73 No 76A-354 Vía al Volador, Medellín 05001000, Colombia
2
Universidad Nacional de Colombia, Carrera 80 No 65-223-Block M8-113, Medellín 050041, Colombia
*
Author to whom correspondence should be addressed.
Academic Editor: Tapas Mallick
Received: 11 September 2015 / Revised: 14 October 2015 / Accepted: 19 October 2015 / Published: 2 November 2015
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Abstract

The maximum power point tracking (MPPT) of photovoltaic systems must be as fast and accurate as possible to increase the power production, which eventually increases the PV system profitability. This paper proposes and mathematically analyses a sliding-mode controller to provide a fast and accurate maximum power point tracking in grid-connected photovoltaic systems using a single control stage. This approach avoids the circular dependency in the design of classical cascade controllers used to optimize the photovoltaic system operation, and at the same time, it reduces the number of controllers and avoids the use of linearized models to provide global stability in all the operation range. Such a compact solution also reduces the system cost and implementation complexity. To ensure the stability of the proposed solution, detailed mathematical analyses are performed to demonstrate the fulfillment of the transversality, reachability and equivalent control conditions. Finally, the performance of the proposed solution is validated using detailed simulations, executed in the power electronics simulator PSIM, accounting for both environmental and load perturbations. View Full-Text
Keywords: DC/DC converter; maximum power point tracking (MPPT); photovoltaic systems; sliding mode control; grid-connection DC/DC converter; maximum power point tracking (MPPT); photovoltaic systems; sliding mode control; grid-connection
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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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Valencia, P.A.O.; Ramos-Paja, C.A. Sliding-Mode Controller for Maximum Power Point Tracking in Grid-Connected Photovoltaic Systems. Energies 2015, 8, 12363-12387.

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