Three phase photovoltaic grid-tied inverter based on feed-forward decoupling control using fuzzy-PI controller

This paper presents a two-stage photovoltaic grid-connected inverter that features fuzzy control. The dq synchronous rotating reference frame is used to model the inverter and feed-forward decoupling control strategy is used. The proposed controller provides decoupled control of active and reactive power while simplicity merit of dq reference frame is preserved. The combination of the flexible and intelligent fuzzy logic with the classical PI controller makes the control of the system more feasible and accurate. In this paper the initial parameters of fuzzy logic controller are obtained from its linear counterpart. The effectiveness and precision of the proposed control strategy are verified by the simulation of a grid-tied three-phase photovoltaic inverter.