With energy, zoology and environments being paid increasing attention, a photovoltaic (PV) system supplying power directly to a power grid becomes more popular available. This paper focuses on the structure design and control strategies of inverters for the grid-connected PV system. It starts with an examination of the demands requested by the power grid, the PV array and the users for the inverters. Then follows a review to see how these demands are achieved with all sorts of topologies and control strateg...