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This paper focuses on a control application of marine power management system (PMS) based on model free adaptive (MFA). The speed-frequency stability of power station is determined by the dynamic characteristic of the diesel engine fuel supply control. In order to obtain good and consistent power control performance, and restrain the load disturbance and improve the dynamic precision of diesel engine, the MFA control scheme is designed for PMS. MFA controller consists of a conventional governor and a feedforward current control. Simulation results show that MFA controller improves the dynamic performance of the PMS in case of system model uncertainty, thus enhances the voltage stability of PMS.