Control strategy of grid-connected photovoltaic system with energy storage

With the increasing of grid-connected capacity of photovoltaic(PV) power generation, the influence of its power fluctuation on the grid becomes more and more serious. To improve the interface characteristics of large-scale PV system, a control strategy of Virtual Synchronous Generator is introduced to the energy storage-based grid-connected PV system. The proposed control strategy achieves a novel and friendly interface like a traditional synchronous generator, which is contributed to the PV system accepted by the grid. The simulation model is built and the simulation results verify the proposed control system.