Dynamic modeling and analysis of an automatic reconfigurable shipboard power system
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In future United States Naval warships, all ship power will be converted to electricity and distributed to a complex system of loads through transmission lines. Because these loads are dynamic by nature, it is necessary to develop a control system that can both respond to these changes and rapidly alter the power system interconnections for protection and efficiency. This thesis describes the development of models and analysis methods for evaluating a centralized method of shipboard reconfiguration control. This control utilizes sub-cycle, time-based measurements used to estimate equivalent impedances that characterize the dynamic power system. An optimization algorithm determines steady state switch configurations and a logic routine checks the validity of intermediate switch states. Several test cases are simulated to demonstrate emergency and non-emergency reconfiguration. The speed and accuracy of reconfiguration are dependent on three conditions: current and voltage noise level, the algorithm used to determine equivalent impedances, and the dynamic nature of the load change. With adequate computing resources, careful selection of filter parameters, i.e., the cessation of a transient, and minimal noise, reconfiguration within one cycle is possible.