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

Energies

Paula Andrea Ortiz Valencia²  Carlos Andres Ramos-Paja¹ 

[1] Universidad Nacional de Colombia, Carrera 80 No 65-223-Block M8-113, Medellín 050041, Colombia;;Instituto Tecnológico Metropolitano (ITM), Calle 73 No 76A-354 Vía al Volador, Medellín 05001000, Colombia

关键词: DC/DC converter;    maximum power point tracking (MPPT);    photovoltaic systems;    sliding mode control;    grid-connection;   

DOI  :  10.3390/en81112318

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.