Since　chaotic　oscillation　in　power　system　causes　serious　damage　to　the　stability　of　the　whole　system,　a　dynamic　surface　sliding　mode　control　strategy　is　proposed　for　the　seven　dimensional　chaotic　power　system.　Firstly,　chaotic　oscillation　behavior　in　the　power　system　was　analyzed,　and　the　existence　of　chaotic　attractors　was　demonstrated.　Then,　the　construction　process　of　coupled　dynamic　model　of　controlled　power　system　with　energy　storage　devices　was　given.　Chaos　control　problem　was　finally　reduced　to　the　control　of　three　dynamic　subsystems　with　strict　feedback　form,　and　corresponding　dynamic　surface　sliding　mode　controllers　were　designed　for　them.　Due　to　the　characteristics　of　the　controlled　system,　introducing　sliding　mode　control　in　the　dynamic　surface　control　method　can　reduce　the　design　steps　of　dynamic　surface　controllers　and　the　complexity　of　stability　analysis　of　closed-loop　system.　Stability　analysis　proves　that　closed-loop　system　can　achieve　uniformly　ultimately　bounded　stability.　Finally,　the　effectiveness　of　designed　controllers　is　verified　by　numerical　simulation.　©　2021,　Harbin　University　of　Science　and　Technology　Publication.　All　right　reserved.