Modelling and control of a grid-connected PV system for smart grid integration

This paper presents the modelling and control of a grid-connected PV system in LabVIEW environment. The proposed control system provides interactivity with the grid: the control system features communication with the grid operator and thus it is able to operate either in maximum power point tracking (MPPT) or in limited power point tracking (LPPT). The second is useful in certain cases when there is considerable excess of renewable energy generation and low consumption — in such cases, although rarely, the grid operator can curtail certain PV or wind generators in order to preserve the system stability. With the feature of LPPT, PV generators can be dispatched to maintain a limited power output, controlled by the distribution system operator thus enabling interactivity with the grid.