In　order　to　study　the　supraharmonic　transmission　and　propagation　characteristics　of　photovoltaic　grid-connected　inverter,　a　more　accurate　model　of　photovoltaic　grid-connected　inverter　was　proposed　based　on　PSCAD　simulation　software.　Firstly,　the　model　of　the　photovoltaic　system　is　built.　Secondly,　the　inverter　control　method　suitable　for　dynamic　analysis　of　grid　connection　is　modeled,　and　the　voltage　and　current　double　loop　control　strategy　is　adopted　to　realize　the　decoupling　control　of　active　and　reactive　power.　Finally,　a　simulation　model　was　built　and　the　influence　of　the　main　parameters　of　the　photovoltaic　system,　such　as　illumination,　temperature　and　switching　frequency,　on　the　level　of　the　supraharmonic　emitted　by　it　was　analyzed.　And　then　the　correctness　of　the　model　is　verified　by　comparison　with　the　field　measured　data.　The　model　provides　an　effective　simulation　platform　for　verifying　the　superaharmonic　current　and　voltage　emissions　of　photovoltaic　grid-connected　inverters　under　working　conditions.　©　2019　IEEE.