How we can assign the tilt of PV array in EnergyPlus?

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As user @Ricardo GAllegos suggested, you need to create the 'shading:building' or 'shading:site' object. More specifically, according to 'Input Output reference guide pp.334 E+ 8.5'),

Shading:Site, PV-roof-mounted-surface, !-Name Your angle here, !Azimuth Your angle here, !-Tilt Your coordinate here, !- Starting X coordinate Your coordinate here, !- Starting Y coordinate Your coordinate here, !- Starting Z coordinate number, !-Length number, !-Height

then connect that surface to the photovoltaic Generator:Photovoltaic, PV:ZN_1_FLR_1_SEC_1_Ceiling, !- Name PV-roof-mounted-surface, !- Surface Name PhotovoltaicPerformance:Simple, !- Photovoltaic Performance Object Type 20percentEffPVhalfArea, !- Module Performance Name Decoupled, !- Heat Transfer Integration Mode 1.0, !- Number of Series Strings in Parallel {dimensionless} 1.0; !- Number of Modules in Series {dimensionless}

Look up the ShopWithPVandBattery.idf example

You need to create a titled surface in "shading: building" and link this surface in " generator:photovoltaic "