This　study　aims　at　specifying　the　operational　risk　assessment　of　active　distribution　networks　(ADNs).　Correspondingly,　an　operational　risk　assessment　model　based　on　point　estimate　method　(PEM)　considering　probabilistic　uncertainties　of　distributed　generators-loads　and　power　management　of　vanadium　redox　flow　battery　(VRB)　energy　storage　systems　(ESSs)　was　proposed.　The　probabilistic　uncertainties　of　distributed　generators　and　loads　growth　are　mathematically　modelled　and　discretised　by　PEM.　Also,　the　distributed　VRB　ESSs　are　maximally　used　for　the　consumption　of　renewable　energy　and　power　supply　of　loads　by　the　power　management　of　VRB　ESSs.　The　risk　assessment　indexes　of　expected　energy　not　supplied　and　severity　index　for　ADNs　are　constructed　and　the　2m　+　1　PEM　was　used　for　the　calculation.　Finally,　the　case　studies　verified　the　effectiveness　of　PEM　as　the　relative　error　is　less　than　1.75%　and　the　excellent　advantage　on　fast　calculation.　In　addition,　both　the　power　management　of　distributed　VRB　ESSs　and　the　dispersion　of　DGs　or　VRB　ESSs　have　a　significant　influence　on　the　operational　risk　assessment　of　ADNs.