Abstract
This paper demonstrates a novel fuzzy control strategy for power extraction and management in a grid-tied low concentration photovoltaic (LCPV) — battery energy storage system (BESS) hybrid system with variable solar irradiance and variable customer loading. The work focuses on enhancement in grid support, minimizing oscillations in the dispatched power, regulation of dc link voltage and improvement in total harmonic distortion (THD) of inverter current and voltage. Transient variation in dc link voltage is stabilized via battery charge control, using a dual switch buck-boost converter. Optimum selection of the scale factors of the fuzzy PI current controllers of all power converters is obtained with trial runs which minimize error oscillations and decrease the settling times for all responses. The novelty of the work lies in a better tracking control of the inverter by the proposed method as it is able to extract higher power from the storage battery under normal operating conditions. A simulated comparison of performance of fuzzy-PI control over classical-PI control is shown using MATLAB/SIMULINK.
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