Simulation of an energy storage system to compensate pulsed loads on shipboard electric power system

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.