NICOP - Design, Analysis and Control of Pulsed Power Loads in the Future Shipboard Power Systems
Abstract
With increased electrification of naval ships, fully integrated power systems onboard are gradually becoming a reality. In this scen""ario, flexibility of the electrical power distribution allows supply of a broad range of loads. Among different load types, pulsed p"ower loads (PPLs) introduce the most significant challenge for the operation of the system. What is common to all of them is the fact that they draw very high currents through a short period of time which can cause significant deviations of frequency (for AC type distribution) and/or voltage (both AC and DC type distributions) in the entire shipboard microgrid. In the context of naval vessels", new types of loads such as electromagnetic launch and recovery systems, high power radars and sonars, rail guns and free-electron"" lasers can be categorized as PPLs. Depending on the particular load type and its rating, they can draw powers in range from several" to hundreds of MWs which can compromise the safe operation of the shipboard microgrid. While PPLs are traditionally present in nava"l applications, fast development of the electromagnetic and laser technologies is not accompanied by corresponding improvements of p"ower generation technologies that could handle their ever higher power rates. It is evident and well recognized that t"he utilization of energy storage, most commonly in the form of local PB, is the only way to increase the PPL absorption capabilities"" onboard today. In the case of PPLs of lower rates, PBs are often used together in conjunction with other, power electronics regulat""ed, ESS. However, state of the art approaches fail to optimally utilize these storage technologies. The principal reason for that is" a fact that technical bottlenecks of SPS when supplying PPLs are not well understood and hence the basis for deriving all existing" PPL compensation strategies was by now only intuitive. On the contrary, this project attempts to circumvent the identified obstacle""s and investigate the technical limitations of SPS in a more methodical way. In this regard, state-space dynamic modeling approach w"ill be used to build a branch of representative SPS architecture. Then a field experience and available manufacturer data will be used as an input to the model to obtain its realistic behavior. Mathematical tools such as principal component analysis and singular value decomposition will be deployed to discover which disturbances excite which performance indicators of the system which will enable the specification of measurable disturbance metric (DM). Consequently DM will be used as a main guideline to design algorithms for optimal handling of PPLs that exist on SPSs. These algorithms will be newly developed and verified either on reduced scale experim"ental platforms, or in a real time simulator. The ultimate aim of the project is to overcome the limitations of existing strategies" that deal with integration of different types of PPLs into SPSs and to come up with new ones with improved flexibility with respect to actual capabilities and current operating conditions of the overhead SPS.Expected outcomes of the research effort:Tools an"d algorithms: real time model of the all-electric ship, PPL disturbance estimation tool, algorithm for optimal rechargin""g of high power PPLs, algorithm for minimizing voltage dips in case of connection of lower power PPLs, reduced scale experimental an"d real time simulation platforms. Publications: 2 SCI-indexed journal papers + 4 int. conference papers.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 01, 2017
- Source ID
- N629091712106
Entities
People
- Tomislav Dragievi
Organizations
- Aalborg University
- Office of Naval Research
- United States Navy