Photovoltaic battery charger with sliding mode control and charging current derivative limitation
Journal Title: TecnoLógicas - Year 2018, Vol 21, Issue 42
Abstract
n stand-alone photovoltaic (PV) systems, battery chargers are important to guarantee the energy supply when sunlight is not available. Such chargers need to trackthe maximum power point (MPPT) and limit the derivative of the batteries’charging current to extendtheir lifetime. This paper proposes a battery charging system composed of a Buck converter, a cascade control of the battery current and the PV panel voltage, and the Perturb and Observe (P&O) MPPT technique. P&O generates the reference of the panel voltage for the external loop of the cascade control implemented with a P regulator, whose control action is the reference of the batteries’charging current. Such current reference passes through a derivative limiter before reaching the internal current control loop, which is implemented by a sliding-mode controller (SMC). Thispaper includes transversality and reachability analyses of the SMC, as well as the procedure to design the P regulator. The proposed system is validated by simulations in PSIM software to show its capacity to perform MPPT and limit the battery’scharging current derivative at the same time.
Authors and Affiliations
Carlos A. Ramos-Paja, Andrés J. Saavedra-Montes, Juan D. Bastidas-Rodríguez
Keywords
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- EP ID EP336622
- DOI 10.22430/22565337.784
- Views 122
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