In recent years

distributed photovoltaic（PV）systems have entered a period of rapid development. Affected by the site environment

the distributed PV system is vulnerable to the nearly shadows during operation

resulting in loss of power generation which affecting demand side energy management. The generation performance of distributed PV system under the influence of nearly shadow is simulated and analyzed. The influence mechanism of shadow on the output characteristics of PV array is studied

the loss of power generation due to shadow is quantified

and the PV array engineering model and occlusion model are established. Based on this

combined with the annual solar position algorithm

the annual power generation of a distributed PV system under shadow is simulated

and the power generation loss and the economic loss of the distributed PV system before and after shadow is analyzed. The results can provide a reference for the design and planning of distributed PV system.