The use of large-scale simulations to accurately predict the behavior of the complex, closely coupled power systems characteristic of the all-electric ship is described and the application of such simulations to the systematic optimization of power systems and control systems is discussed. Simulations of a two-generator, two-motor system with PWM drives are coupled with a gradient-based line-search optimization strategy to determine the gains on a motor controller and on a simple ship-wide control system to minimize both motor speed error and generator speed error. The same search strategy is employed with simulations of a series PWM converter configuration to permit determination of an inter-converter filter that gives the most accurate reproduction of a target waveform at the filter output. The results of even these relatively simple test cases show clearly the necessity of large-scale simulations for understanding and designing electric-ship power systems and the potential utility of optimization techniques in concert with the large-scale simulations to enhance the performance of electric ships.
S. Woodruff, Presented at the 2004 Electric Machines Technology Symposium, Philadelphia, PA, Jan. 27-29, 2004.