Excessive short-circuit current and voltage unbalance triggered by asymmetrical faults on the AC side of the flexible grid-connected wind power in the deep ocean can seriously threaten the system safety and operation stability, and it is difficult for the existing control strategy to ensure that the voltage support capacity and current safety boundary are taken into account at the same time. Aiming at this problem, this paper proposes a coordinated control strategy for short-circuit current and voltage unbalance based on the maximum voltage support capability. Firstly, the coupling mechanism of short-circuit current and voltage unbalance under asymmetrical fault is analyzed; secondly, short-circuit current and voltage unbalance are considered comprehensively from the power point of view, and an optimization model is constructed to minimize the short-circuit current by taking the partitioned voltage unbalance as a constraint on the basis of the guaranteed maximization of the voltage support capability. Once again, in order to obtain the optimal ratio of positive and negative sequence active and reactive power, the segmented linear upper envelope is used instead of the original non-convex model, and auxiliary variables are introduced to realize the constraint linearization for the solution; finally, the feasibility and validity of the control strategy proposed in this paper are verified by constructing a wind farm grid-connected simulation model based on the PSCAD/EMTD platform, which provides the coordinated control and safe operation of the wind power flexural system in the deep ocean. Theoretical support.