Harmonic analysis on power grid of large scale PV grid-connected system

In this paper, based on the basic feature and its engineering calculation method of photovoltaic power, the mathematical model of PV power was established. The voltage oriented control (VOC) was applied in connecting to the power grid. In the context of PSCAD/EMTDC, a PV grid-connected system model was constructed and simulation research was conducted. The results demonstrated the main harmonic source of the photovoltaic grid-connected system and measures to restrain the harmonics effectively were summarized, which provided theoretical basis and engineering foundation for improving the power quality of a photovoltaic grid-connected system.