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A current-based fuzzy controller for MPPT of grid-connected PV systems

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The output voltage oscillations of a photovoltaic (PV) system in parallel with other challenging voltage sources such as batteries result in drastic power oscillations. So, it is much more attractive… Click to show full abstract

The output voltage oscillations of a photovoltaic (PV) system in parallel with other challenging voltage sources such as batteries result in drastic power oscillations. So, it is much more attractive to employ a PV system as a current source rather than as a source of voltage alongside a battery. To this aim, the inductance current of the PV's DC–DC converter is controlled and forced to track the maximum power point (MPP) reference, acting as a source of current. Then, the load voltage, and the DC–DC converter output voltage would be the same as the battery voltage. For this purpose, the paper proposes a two-level current-based maximum power point tracking (MPPT) algorithm. The proposed high-level algorithm contains two loops, namely, a set-point calculation loop and a fine-tuning loop. Based on an offline calculation using the PV's short circuit current, the set-point loop first estimates the PV's maximum power point. Second, the fine-tuning loop tracks the exact value of the PV's maximum power point, us...

Keywords: voltage; power point; current based; maximum power; point

Journal Title: Journal of Renewable and Sustainable Energy
Year Published: 2017

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