Abstract:As demand of the distributed power grid-connected increased constantly, the frequent of distributed power grid connected becomes an important issue, we designed a equipment of distributed power in synchronized grid-connected based on reserve protection, and the equipment have three remote functions like DTU, integrated within the protection equipment to reduce the cost, using LPC2468 to build the hardware circuit, real-time acquire both sides of the grid parameters to monitor distributed power, using the derivative algorithm fastly to calculated the real-time phase angle difference, embedded real-time multitasking operating can protect functions of system, to make distributed power grid-connected rapidly and accurate.