Power system stability analysis of synthesized complex impedance loads on an electric ship

Initial design considerations of shipboard power distribution grids require a priori load dynamics assumptions for size assessment, power/energy requirements, and system stability considerations. For the analysis of dc micro-grids, power processing units and dynamic loads are often assumed destabilizing constant power loads for simplified stability studies. The constant power load is shown to be valid under certain load conditions, and other potential destabilizing load forms are introduced and discussed. As an example, a hydrodynamic load on a typical shipboard motor is shown to influence the stability characteristics of the power grid. Additionally, a model reduction analysis is proposed for early stage power system stability analysis.