Through the analysis of the characteristics of photovoltaic power generation, it can be seen that the influence of photovoltaic power generation system on the power grid is mainly caused by the instability of photovoltaic power supply. From the perspective of the safety, stability and economic operation of the power grid, the photovoltaic grid-connected power generation system without energy storage will have adverse effects on the line power flow, system protection, economic operation of the power grid, power quality and operation scheduling. The grid-connection of photovoltaic power stations, especially large-scale photovoltaic power stations, can not be ignored. At present, the way to solve the impact of photovoltaic power stations on the grid is to improve the flexibility of the grid or to allocate energy storage devices for grid-connected photovoltaic power stations.

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