Distributed power generation system uses solar panels, then convert solar power into electricity directly. It’s a new and comprehensive way of utilization of power generation & energy with broad development prospects. It advocates three principles of  “ the nearest power generation, the nearest incorporation into the power grid, the nearest use “. It not only imporve the power generation capacity, but also solve the energy loss problem in the boost and transporation period. “Ecnomic , green ,beautiful “are three main advantages for distributed power system. These systems must be connected to the public grid, and supply power to the nearby user together. If there is no grid support, distributed systems can not guarantee the power reliablity and quality for the user.