The key technology of renewable energy application is to guarantee that the power energy for its conversion and grid integration must meet the requirements of grid voltage and frequency. In this paper, the droop control of grid-connected DC micro power is analyzed. The voltage controller and current controller are employed for the dual- loop control of the grid-connected inverter in accordance with grid integration requirements for voltage and frequency. The three kinds of system faults, namely, load mutation, voltage drop and three-phase short-circuit are simulated and analyzed. It is shown that the grid system including DC micro power can run steadily in three faulty conditions, and can track the dynamic output of the system smoothly.
East China Electric Power
DC micro source