High　penetration　rate　of　renewable　energy　is　inevitable　in　the　future　grid,　in　which　the　volatility　and　randomness　characteristics　may　cause　flexibility　insufficient　to　system　operation　of　the　distribution　network.　An　optimal　scheduling　model　of　technical　virtual　power　plant　that　takes　into　account　the　flexibility　and　economy　of　the　distribution　network　is　proposed　in　this　paper,　in　which　the　internal　network　operation　constraints　and　security　constraints　are　considered.　Firstly,　an　index　of　flexibility　is　established　to　ensure　that　the　system　has　sufficient　flexibility　margins　for　each　period　of　operation　in　the　electricity　market　environment.　The　price-based　demand　response　is　established　through　a　stepwise　elasticity　method,　by　which　the　users　are　guided　to　responded　to　the　changes　of　wind　and　photovoltaic　power　output,　and　electricity　market　prices.　Scenario　analysis　method　is　used　to　describe　the　uncertainty　of　wind　power　and　photovoltaics,　and　the　extreme　scenario　is　optimized　to　ensure　flexibility　of　the　system.　Then,　the　non-convex　nonlinear　conditions　in　the　model　are　relaxed　into　a　mixed-integer　second-order　cone　programming　problem　based　on　the　second-order　cone　convex　optimization　theory　and　Big-M　approach　so　as　to　get　the　solutions　more　effectively.　Finally,　the　validity　and　rationality　of　the　model　are　verified　based　on　the　simulation　results.　©　2021,　Solar　Energy　Periodical　Office　Co.,　Ltd.　All　right　reserved.