The geographic suitability brings the offshore wind farm (OWF) and marine current farm (MCF) together with their aggregated power fed to grid simultaneously in most relevant energy harnessing infrastructures. However, stability assessment of the integrated system is a major concern due to the integration of stochastic and intermittent sources with parametric uncertainty. Bridge-type fault current limiter (BFCL) has consolidated their application for a suitable enhancement of stability margin for most modern supply systems. In this article, a detailed modelling of the integrated system is carried out in the presence of BFCL along with consideration of uncertainty as well. A robust H∞ controller design strategy for stability assessment of grid-connected OWF and MCF in the presence of parametric uncertainties is presented in this article. Linear matrix inequality (LMI) conditions are derived in the context of evaluating the robust controller gain with respect to desired robust stability margin. The efficacy of the controller design is compared with that of H∞ loop shaping and conventional P-I control through different case studies with simulation followed by real-time digital simulator (RTDS) validation. Nomenclature ω bw , ω bmr angular velocity of the wind turbine and marine current turbine ρ w , ρ m density of wind and marine current, respectively λ dq0s , λ dq0r ′ flux linkage of stator and rotor, respectively J mct moment of inertia of the marine current turbine T m0 , T e0 mechanical and electrical output torque of generator C pw (λ w , β w) power coefficient of offshore wind turbine C p_mct (λ mr , β mr) power coefficient of marine current turbine R rw , R mct radius of wind and marine current turbine ω ref , ω r reference and rotor angular speed of DFIG i dq0s , i dq0r ′ stator and rotor current of SCIG in d-q frame of reference, respectively i s , i r stator and rotor current of DFIG r s , r r stator and rotor resistance of DFIG v s , v r stator and rotor voltage of DFIG ψ s , ψ r stator and rotor linkage flux of DFIG V dq0s terminal voltage of SCIG in d-q frame of reference V w , V m velocity of wind and marine current

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