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The electrical propulsion vessels are complex, multi variable and highly nonlinear. They require advanced controls ensuring good robustness in stability and performance. This paper focuses on modeling and sliding mode control of electric propulsion system of a ship insured by a double star synchronous motor. We propose a structure of sliding mode control performance which well be applied it to ship electric propulsion system. A numerical study simulation of the proposed control is presented. The simulation results have allowed us to analyze the behavior of the loop for various operating conditions of the system.