Dynamic reliability analysis method of photovoltaic support system(PSS)was proposed considering the multiple uncertainties.Firstly

the reliability analysis model of PSS was constructed based on the probability density evolution method(PDEM)

including the probability conservation equation

basic governing equation and density evolution equation.Then

the finite element analysis model of PSS was built

including the structural stress model

load combination form

and mesh generation algorithm.In simulation

the randomness in load combination and structures were incorporated

in which consists of six basic random parameters and 44 representative systems.The solution efficiency was improved by the joint simulation of PDEM and Abaqus.Results show that stress and displacement are two failure modes of PSS

and the influence of the latter is more obvious.The reliability index under the basic load combination condition is 0.928.As wind speed increases

the structural reliability decreases.In the high⁃speed range larger than 40 m/s

the uncertainty in structure itself will overestimate the reliability level of PSS

which should be paid attention in design.