Aiming　at　bi-directional　DC-DC　converter　in　microgrid　system　needs　to　have　excellent　steady-state　characteristics　and　dynamic　response　at　the　same　time,　this　paper　proposes　an　active　disturbance　rejection　control　scheme　of　dual　active　bridge　(DAB)　DC-DC　converter　combined　with　current　stress　optimization.　And　the　key　technologies,　such　as　the　mathematical　model　of　transmission　power　and　current　stress,　the　combination　of　current　stress　optimization　and　active　disturbance　rejection　control,　are　analyzed.　On　the　basis　of　extended　phase-shift　modulation,　the　optimal　solution　of　current　stress　in　different　working　modes　is　solved　by　the　conditional　extreme　value　method.　The　extended　state　observer　is　used　to　estimate　the　system　state　in　real-time.　The　input　voltage　mutation,　load　switching,　transmission　power　fluctuation　caused　by　current　stress　optimization　strategy　are　regarded　as　system　disturbances　and　compensated.　Finally,　a　set　of　200W　prototype　is　designed　and　developed.　The　experimental　results　verify　the　feasibility　and　advancement　of　the　proposed　control　scheme.　©　2022,　Electrical　Technology　Press　Co.　Ltd.　All　right　reserved.