Browsing by Subject "microgrid"
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Item A dc arc model for series faults in low voltage microgrids(IEEE, 2012-12) Uriarte, F.M.; Gattozzi, A.L.; Herbst, J.D.; Estes, H.B.; Hotz, T.J.; Kwasinski, A.; Hebner, R.E.This paper presents a dc arc model to simplify the study of a critical issue in dc microgrids: series faults. The model is derived from a hyperbolic approximation of observed arc voltage and current patterns, which permit analyzing the arc in terms of its resistance, power, energy, and quenching condition. Recent faults staged by the authors on a dc microgrid yielded enough data to develop an arc model for three fault types: constant-gap speed, fixed-gap distance, and accelerated gap. The results in this paper compare experimental and simulation results for the three fault types. It is concluded that because the instantaneous voltage, current, power, and energy waveforms produced by the model agree well with experimental results, the model is suitable for transient simulations.Item Dynamic Load and Storage Integration(IEEE, 0000-00-00) Hebner, R. E.; Davey, K.; Herbst, J.; Hall, D.; Hahne, J.; Surls, D.; Ouroua, A.Modern technology combined with the desire to minimize the size and weight of a ship’s power system are leading to renewed interest in more electric or all electric ships. An important characteristic of the emerging ship power system is an increasing level of load variability, with some future pulsed loads requiring peak power in excess of the available steady– state power. This inevitably leads to the need for some additional energy storage beyond that inherent in the fuel. With the current and evolving technology, it appears that storage will be in the form of batteries, rotating machines, and capacitors. All of these are in use on ships today and all have enjoyed significant technological improvements over the last decade. Moreover all are expected to be further enhanced by today’s materials research. A key benefit of storage is that, when it can be justified for a given load, it can have additional beneficial uses such as ride-through capability to restart a gas turbine if there is an unanticipated power loss; alternatively, storage can be used to stabilize the power grid when switching large loads. Knowing when to stage gas turbine utilization versus energy storage is a key subject in this paper. The clear need for storage has raised the opportunity to design a comprehensive storage system, sometimes called an energy magazine, that can combine intermittent generation as well as any or all of the other storage technologies to provide a smaller, lighter and better performing system than would individual storage solutions for each potential application.Item Intelligent Microgrids(0000-00-00) Uriarte, F.; Hebner, R.Item Performance Assurance for DC Cables for Electric Ships(2015-06) Hebner, R. E.; Gattozzi, A. L; Pekarek, S. D.Minimizing the weight and volume in a ship cable plant improves system efficiency or provides the capability to carry more critical payloads. Cabling should be as small as possible. This research developed an approach to the fundamental understanding needed to design, specify, and test cabling that has the minimum prudent size with high reliability. Progress requires a convolution of the failure modes with the thermal, electrical, and mechanical environment in which the cable is operating.