Composite System Stability Methods Applied to Advanced Shipboard Electric Power Systems.

摘要

Large increases in the complexity of shipboard electric loads as well as development of electric drive, integrated electric drive and pulsed power systems make manifest the present and future importance of naval electric power systems. The most crucial attribute of these systems is their ability to fulfill their function in the presence of large-signal perturbations. Fundamental differences between shipboard and commercial electric power systems make all but the most general nonlinear, large-signal stability analyses inappropriate for the design and assessment of naval electric power systems. The tightly coupled and compact nature of shipboard systems are best accommodated by composite system stability analyses. Composite system methods, based upon Lyapunov's direct method, require that each component's stability be represented by a Lyapunov function. A new Lyapunov function which is based upon co-energy is developed for 3-phase synchronous machines. This use of co-energy is generalizable to all electromechanical energy conversion devices. The co-energy-based Lyapunov function is implemented as a stability organ which generates waveforms at information terminals of a device object in the object oriented simulation environment of WAVESIM. Single generator simulation results are used to acquire a measure of the over sufficiency of the co-energy-based Lyapunov function.