Galvanically Isolated Power Converter Module for DC Zonal Electric Distribution Systems

摘要

The United States Navy is currently in a state of transition from mechanical to electric propulsion. Future warships, such as the new destroyer class, will contain an Integrated Power System (IPS) that provides power to all propulsion and ship service loads. These warships will likely have a dramatic increase in the number of power electronic loads, both AC and DC. For ship service loads, a DC Zonal Electric Distribution System (DCZEDS) will likely be used. DCZEDS requires a device that provides galvanic isolation between the feeder buses and the zones to prevent fault propagation between zones. For DCZEDS to be practical, DC-DC converters that provide galvanic isolation with an efficiency and reliability approaching that of existing low frequency AC isolation transformers must be placed between the feeder buses and the zones. This thesis examines the construction and operation of a prototype galvanically isolated DC-DC converter using commercial-off-the-shelf parts. The converter uses a single-phase high-frequency transformer link to provide galvanic isolation. This work shows that this converter topology is reliable enough to be used in an IPS. A three-phase solution using this topology can provide sufficient power density at the megawatt level, necessary for an interface converter in DCZEDS.