Nonlinear Predictive Control for Maximum Power Point Tracking and Unity Power Factor of a Three Phase Grid Connected PV System

摘要

We address in this paper the control of a three phase single stage grid connected PV system based on Nonlinear Continuous-time Generalized Predictive Control (NCGPC). Without using the intermediate DC/DC converter, the three-phase inverter must operate the photovoltaic system at its maximum power with a unit power factor. The NCGPC controller is based on a synchronized nonlinear model of the PV system. Grid synchronization is provided by a three-phase PLL (Phase-Locked Loop). The closed-loop stability is ensured by the convergence of the output-tracking errors to zero. The performance of the proposed control strategy is evaluated using rapid changes in atmospheric conditions, acting on the PV system, in MATLAB/SIMULINK environment. Obtained results demonstrate the high performance of the proposed control scheme.