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For warship electric power system, the pulsed loads (as radar or sonar) can be particularly embarrassing: when the pulsed load is running, the generators can be always in transients which can stress prime-mover and exciter actuators. Regarding the power quality, frequency and voltage modulation troubles can appear which can lead to sensitive load mis-operations and grid instability. In this paper, the limitations of pulsed load power level relating to the supply power are discussed regarding the military standard STANAG 1008: the necessity of adapting the shipgrid design is then stated. The simulation of a fast-power varying energy storage system in a simple ship grid is performed: this system is designed to compensate a pulsed load that induces excessive frequency modulation. The simulation results show a drastic reduction of the frequency modulation (by 90%) and a quite invariant power provided by the diesel generator when the compensator is running.