Crashback is one of the most dramatic maneuvers a naval combatant can perform. Propulsion power can go from full ahead to full astern in minutes and the rate of change of power itself changes dramatically during this period. The integrated power system of an all-electric ship can experience unfortunate electrical disturbances and even system-wide instability.
This paper investigates the dynamics of crashback maneuvers on IPS performance. A detailed description of the crashback maneuver is given with emphasis on the problems posed for motor control during each phase of the maneuver. A discussion of the possibilities for drive controller optimization are then presented. A notional destroyer-class all-electric ship simulation capability developed on the Real Time Digital Simulator (RTDS) is described. Finally, simulation results for crashback simulations performed under varying conditions are given with the propulsion motor drives operating under speed control and then power control.
M. Andrus, S. Woodruff, M. Steurer, and W. Ren, Presented at the ASNE Advanced Naval Propulsion Symposium, Arlington, VA, October 30-31, 2006
KEYWORDS: integrated power system, IPS, real-time digital simulator, RTDS, crashback, power control, speed control, simulation, modeling.