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ABSTRACT: Permanent magnet and wound rotor synchronous machines (PMSMs and WRSMs) are often used in diesel engine-based portable power generation systems. In these applications, there is a growing desire to improve machine efficiency in order to reduce fossil fuel requirements. In addition, there is a desire to reduce mass to improve mobility. To attempt to address these competing performance objectives, a system analyst is confronted with numerous choices, including machine type (PM or WR), converter architecture (active/passive), and control. Herein, to assist the analyst, design tools capable of performing automated multi-objective optimization of PMSMs and WRSMs connected to both active and passive rectifiers are described. The tools are then used to derive tradeoffs between mass and efficiency for a 3 kW application.
Power and Energy Conference at Illinois (PECI), 2010; 03/2010
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ABSTRACT: In an effort to advance the research and development capabilities related to shipboard power systems, the U.S. Office of Naval Research created the Electric Ship Research and Development Consortium. This group of seven U.S. universities is working to develop near term and far term research solutions for ship power systems on the all-electric ship. This paper provides an overview of the ESRDC, its successes, resources, and activities related to education and research efforts.
Universities Power Engineering Conference, 2008. UPEC 2008. 43rd International; 10/2008
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ABSTRACT: This work sets forth a nonlinear average value model (NLAM) of a switched reluctance machine. NLAMs are characterized by state variables that are constant in the steady-state facilitating high-speed simulation and control analysis and design. The main difficulties in deriving such a model for the switched reluctance machine arise from nonlinearities due to magnetic saturation, absence of mutual inductance, and a nonsinusoidal self-inductance profile which prevents the use of a rotational transformation in arriving at a rotor position-invariant machine description. Herein, these difficulties are overcome by introducing a variable representation that approximates machine variables by the inner product of a vector of basis functions and a time-varying coefficient vector. A set of nonlinear differential equations is derived which governs the behavior of the coefficient vectors. These equations are rotor position invariant and feature state variables which are constant in the steady-state. The resulting model is experimentally validated.
IEEE Transactions on Energy Conversion 04/2006; · 2.27 Impact Factor
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ABSTRACT: Pulsed power weaponry is being considered for inclusion in future warships. In this work, the effects of pulsed power weaponry on a power distribution and propulsion system are demonstrated in the context of a physical system known as the naval combat survivability testbed. It is shown that, as expected, when using an integrated fight through power (IFTP) architecture, the pulsed power load results in a disturbance on the generation ac bus; but it has no effect on the zonal ac busses. The use of propulsion coordination is also investigated.
Electric Ship Technologies Symposium, 2005 IEEE; 08/2005
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A. Monti,
D. Boroyevich,
D. Cartes,
R. Dougal,
H. Ginn,
G. Monnat,
S. Pekarek,
F. Ponci,
E. Santi, S. Sudhoff,
N. Schulz,
W. Shutt,
F. Wang
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ABSTRACT: This paper describes a multi-institution effort to demonstrate and assess newly developed control technologies for ship power systems. In comparison to land-based power systems, or even to earlier era of ship power systems, the now rapid incorporation of power electronics into ship power systems requires a complete redefinition of the control concepts. Furthermore, recent developments in control technology have re-opened debates over issues such as centralized versus distributed control. The complexity of the control problem calls for new hardware structures and new tools for control development and testing. A group of research institutions has teamed up to define a realistic power system scenario for testing several of the new control technologies. What level of re-configurability is reasonable to implement, how far can we push the concept of decentralized agent-based control, and what is the impact of active power management through power electronics? The following question could be addressed by the help of this research.
Electric Ship Technologies Symposium, 2005 IEEE; 08/2005
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ABSTRACT: This paper presents the experience of five faculty from four
universities who are co-developing and team teaching courses using the
world-wide web (WWW). In particular two novel power engineering courses,
Flexible Control of Transmission Systems and Flexible Control of
Distribuction Systems, introduce the student to the application of power
electronic-based controllers, known specifically as flexible AC
transmission systems (FACTS) controllers, to enhance the performance of
the transmission and distribution systems in an electric power system.
In order to leverage faculty expertise in the various topics included in
each course, a unique partnership was formed among five faculty from the
following universities: University of Arkansas, Kansas State University,
University of Missouri-Rolla and Purdue University. In order to achieve
the most effective presentation, in the presence of geographical, cost,
time and technology constraints, the co-developers decided to pursue
various distance learning strategies to link the four universities
together in a live interactive virtual classroom utilizing
dataconferencing software and the WWW. In this paper we address the
trials and tribulations of our experience. In particular, we discuss the
use of video tape technology by mail, the use of live audio and video
via an integrated service digital network (ISDN) approach, and lastly,
dataconferencing software in conjunction with telephone conferencing.
Each of these alternative methodologies are examined in detail and are
compared and contrasted from a cost and pedagogical point of view based
on our experiences
Frontiers in Education Conference, 1998. FIE '98. 28th Annual; 12/1998
