A New Approach of Load Rejection in Fault of PV Output in Smart Grid

The purpose of this paper is to present a new approach of load rejection in smart grid for a combination of emergency generators (EGs) with a photovoltaic power generation (PV). The power balance of grid is not only the influence of generator on the governor control with droop but also the output fluctuation of the PV cannot be ignored. A frequency control and a load control by a load prediction are necessary for the system grid combined with EGs and PV in island mode. When the cloud interrupts light from the sun in maximum output of PV, the output of PV faults at a moment, so that it is difficult to balance the power by the use of EGs with the output change rate limit. This paper presents a method to stabilize supplied power in the grid by a load rejection in fault of PV output with island mode. The proposed method can realize operation by using emulation with grid system model. The verification results show that the emulator is effective in the energy management strategies.