A New Sensorless Hybrid MPPT Algorithm Based on Fractional Short-Circuit Current Measurement and P O MPPT


This paper presents a brand new maximum power point tracking (MPPT) method for photovoltaic (PV) systems. The proposed method improves the operating of the traditional perturb and observe (P&O) technique in changing environmental conditions by using the fractional short-circuit current (FSCC) method. It takes the initial operating point of a PV system by using the short-circuit current technique and later shifts to the traditional P&O technique. The advantage of having this two-stage algorithm is rapid tracking under changing environmental conditions. Yet, this scheme offers low-power oscillations around MPP and, so, a lot of power harvesting compared with the common P&O technique. The proposed MPPT decides intelligently regarding the instant of measuring short-circuit current and is, therefore, an irradiance sensorless theme. The proposed methodology is validated with laptop software simulation followed by a dSPACE DS1104-based experimental setup. A buck-boost dc-dc converter is used for simulation and experimental confirmation. Furthermore, the reliability of the proposed method is additionally calculated. The results show that the proposed MPPT technique works satisfactorily beneath given environmental eventualities.

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