Control and simulation on three-phase single-stage photovoltaic ( PV) system as connecting with power grids

The paper put forward a kind of method of a fast approximation interpolation algorithm to achieve maximum power point tracking (MPPT) of three-phase single-stage photovoltaic (PV) system. The system applied double closed loops control which contained an outer voltage loop and an inner current loop. It completed the active power and reactive power decoupling controlling with PI controller according to the inverter controlling and synchronous rotating coordinates transforming. This method achieved flexible and rapid grid-connected with maximum power per factor, and the same time, it reduced the cost of grid-connected and improved the power quality.