Disturbance-estimator predictive current controller for 1φ interconnected PV systems

Abstract

This paper presents the analysis, development, and experimental performance of a predictive current controller that is featured with a disturbance estimator. The developed current controller is designed to operate a single phase (1φ) grid-side power electronic converter (PEC) employed in photovoltaic (PV) systems. The disturbance estimator is used to reduce the controller sensitivity to parameter variations, as well as to reject grid side disturbances. The design of the controller and its disturbance estimator are carried using the pole-placement method. The performance of the developed current controller is experimentally tested for a 5.4 kW interconnected PV system under different levels of power delivery to the grid that are accompanied with different variations in system parameters. In addition, other controllers used for interconnected PV systems are tested to highlight the advantages of the developed current controller. Performance and comparison results show accurate, fast, and robust responses that are initiated with negligible sensitivity to parameters variations and disturbances on the grid side.