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Electromechanical emulation of hydrokinetic generators for renewable energy research

OCEANS 2013 MTS/IEEE - San Diego: An Ocean in Common

Ruehl, Kelley M.; Jepsen, Richard A.; Roberts, Jesse D.; Glover, Steven F.; Horry, Michael L.

The pace of research and development efforts to integrate renewable power sources into modern electric utilities continues to increase. These efforts are motivated by a desire for cleaner, cheaper and more diverse sources of energy. As new analyses and controls approaches are developed to manage renewable sources and tie them into the grid, the need for these controls to be tested in hardware becomes paramount. In particular, hydrokinetic power is appealing due to its high energy density and superior forecastability; however, its development has lagged behind that of wind and solar due in part to the difficulty of acquiring hardware results on an integrated system. Thus, as an alternative to constructing an elaborate wave-tank or locating a power lab riverside, this paper presents a method based on electromechanical emulation of the energy source using a commercially available induction motor drive. Using an electromechanical emulator provides an option for universities and other laboratories to expand their research on hydrokinetics in a typical laboratory setting. © 2013 MTS.

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TYPE Conference YEAR 2013
OSTIScopus

Voltage and frequency regulation strategies in isolated AC micro-grids

Proceedings - 2012 IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems, CYBER 2012

Wasynczuk, O.; Rashkin, L.J.; Pekarek, S.D.; Swanson, R.R.; Loop, B.P.; Wu, N.; Glover, Steven F.; Neely, J.C.

In ac power systems, including micro-grids, it is important to regulate the amplitude and frequency of the voltages throughout the system. Many of the existing and proposed control strategies for micro-grids are patterned after the classic ac power system. That is, frequency regulation is achieved by designing micro-sources (commonly called Distributed Energy Resources or DERs) to exhibit an output-frequency-versus-power characteristic similar to the speed-versus-power (droop) characteristics of conventional turbo- and hydro-generators. Moreover, voltage regulation strategies are patterned after the output-voltageversus-reactive-power (droop) characteristics of the automatic voltage regulators (AVRs) used in conventional turbo- and hydrogenerators. In this paper, established approaches of frequency and voltage regulation are reviewed. Alternative strategies that utilize modern communication and control technologies are presented and discussed. © 2012 IEEE.

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TYPE Conference YEAR 2012
ScopusOSTI

Impact of time-varying loads on the programmable pulsed power driver called genesis

Digest of Technical Papers-IEEE International Pulsed Power Conference

Glover, Steven F.; Davis, Jean-Paul; Schneider, Larry X.; Reed, Kim W.; Pena, Gary; Hall, Clint A.; Hanshaw, Heath L.; Hickman, Randy J.; Hodge, K.C.; Lemke, Raymond W.; Lehr, Jane; Lucero, D.J.; McDaniel, Dillon H.; Puissant, J.G.; Rudys, Joseph M.; Sceiford, M.E.; Tullar, S.J.; Van De Valde, D.M.; White, F.E.; Warne, Larry K.; Coats, Rebecca S.; Johnson, William A.

The success of dynamic materials properties research at Sandia National Laboratories has led to research into ultra-low impedance, compact pulsed power systems capable of multi-MA shaped current pulses with rise times ranging from 220-500 ns. The Genesis design consists of two hundred and forty 200 kV, 80 kA modules connected in parallel to a solid dielectric disk transmission line and is capable of producing 280 kbar of magnetic pressure (>500 kbar pressure in high Z materials) in a 1.75 nH, 20 mm wide stripline load. Stripline loads operating under these conditions expand during the experiment resulting in a time-varying load that can impact the performance and lifetime of the system. This paper provides analysis of time-varying stripline loads and the impact of these loads on system performance. Further, an approach to reduce dielectric stress levels through active damping is presented as a means to increase system reliability and lifetime. © 2011 IEEE.

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TYPE Conference YEAR 2011
ScopusOSTI

Status of genesis a 5 MA programmable pulsed power driver

Digest of Technical Papers-IEEE International Pulsed Power Conference

Glover, Steven F.; White, F.E.; Foster, P.J.; Lucero, D.J.; Schneider, Larry X.; Reed, Kim W.; Pena, Gary; Davis, Jean-Paul; Hall, Clint A.; Hickman, Randy J.; Hodge, K.C.; Lemke, Raymond W.; Lehr, Jane; McDaniel, Dillon H.; Puissant, J.G.; Rudys, Joseph M.; Sceiford, M.E.; Tullar, S.J.; Van De Valde, D.M.

Genesis is a compact pulsed power platform designed by Sandia National Laboratories to generate precision shaped multi-MA current waves with a rise time of 200-500 ns. In this system, two hundred and forty, 200 kV, 80 kA modules are selectively triggered to produce 280 kbar of magnetic pressure (>500 kbar pressure in high Z materials) in a stripline load for dynamic materials properties research. This new capability incorporates the use of solid dielectrics to reduce system inductance and size, programmable current shaping, and gas switches that must perform over a large range of operating conditions. Research has continued on this technology base with a focus on demonstrating the integrated performance of key concepts into a Genesis-like prototype called Protogen. Protogen measures approximately 1.4 m by 1.4 m and is designed to hold twelve Genesis modules. A fixed inductance load will allow rep-rate operation for component reliability and system lifetime experiments at the extreme electric field operating conditions expected in Genesis. © 2011 IEEE.

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TYPE Conference YEAR 2011
ScopusOSTI
Results 51–75 of 94
Results 51–75 of 94