This paper proposes a novel intelligent control technique based on interval type-2 fuzzy logic controller (IT-2 FLC) for three-phase photovoltaic (PV) power generation system connected to a weak utility grid. In the proposed control technique, the grid-connected PV system is effectively controlled to inject high quality sinusoidal current into the utility grid despite various uncertainties in system operating conditions. The presence of third dimension in the membership function of IT-2 FLC provides an additional degree of freedom and hence it offers excellent control performance than the conventional PI controller and type-1 FLC (T-1 FLC) during system uncertainties. In addition, the proposed control strategy does not require any mathematical model of the system and hence the controller design task is simple. The effectiveness of the proposed controller in reducing the total harmonic distortion of the grid current is verified using extensive simulation studies carried out under different scenarios. Additionally, the results are also compared with existing controller reported in the literature to show the superior performance of the proposed controller under disturbances.
