In the future,the main utilization of solar energy will be the grid-connected Photovoltaic system. With the development of digital signal processors (DSPs),it is possible that some advanced control strategies are applied to the grid-connected PV control system. Aiming at the features of grid-connected PV system,a kind of grid-connected control strategy is presented,which is based on the multi-variable double-loop control and synchronization phase-locked control. The multi-variable double-loop co...