Multistring PV inverters by fuzzy based MPPT and CPG mode

ELECTRICAL ENGINEERING

With a still increasing penetration level of grid connected photovoltaic (PV) systems, more advanced active power control functionalities have been introduced in certain grid regulations. A delta power constraint, where a portion of the active power from the PV panels is reserved to support frequency deviation. In this paper , Multistring PV inverter configuration is adopted to realize delta power control (DPC) for grid-connected PV systems. This control strategy is a combination of maximum power point tracking (MPPT) and constant power generation (CPG) modes.This paper proposes intelligent fuzzy logic control (FLC) method for maximum power point tracking of photovoltaic systems. In this control scheme, one PV string operating in the MPPT mode estimates the available power, whereas the other PV strings regulates the total PV power by the CPG control strategy in such a way that the delta power control for the entire PV system is achieved. Simulations have been performed on a 3-kW single-phase grid connected PV system. The results have confirmed the effectiveness of the proposed DPC strategy, where the power reserve according to the delta power control is achieved under several operating conditions.

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