E. A. Walters, S. D. Pekarek, O. Wasynczuk, PC Krause and Associates, Inc; H. J. Hegner, Naval Surface Warfare Center; L. M. Taylor Proceedings Naval Symposium on Electric Machines, July 1997, pp. 85-90.
Read MoreSimulation of a Zonal Electric Distribution System for Shipboard Applications
O. Wasynczuk, E. A. Walters, PC Krause and Associates, Inc; H. J. Hegner, Naval Surface Warfare Center A new approach of automatically generating state-space models of power circuits and systems is presented. In this approach, the composite system state equations are established algorithmically given the standard node incidence matrix and elementary branch data (e.g. resistances, inductances, back emf’s). The resulting state equations can be solved using a variety of numerical techniques or commercially available computer simulation programs. An example system consisting of a three-phase generator and rectifier load is used to illustrate this approach. Experimental verification is also provided. Proceedings 32nd Intersociety Energy Conversion Engineering Conference, vol. 1, July 1997, pp....
Read MoreReal-Time Distributed Simulation of DC Zonal Electrical Distribution System
J. Jatskevich, C. E. Lucas, E. A. Walters, O. Wasynczuk, PC Krause and Associates Inc; E. L. Zivi, U.S. Naval Academy In this paper, a prototype DC Zonal Electrical Distribution System (ZEDS) developed under the Naval Combat Survivability effort is considered. A model of one zone is described in detail on a component level, and is viewed as a collection of interconnected dynamical subsystems each described by a set of state equations. An innovative approach for distributing the subsystems among multiple computers is shown to result in a significant improvement in simulation speed. Moreover, when Average Value Models (AVMs) replace the detailed converter models, a faster than real-time simulation can be achieved. 2002 SAE Power Systems Conference, October 29-31, 2002, Coral Spring, FL. Paper...
Read MoreDistributed Heterogeneous Simulation of Large-Scale Dynamical Systems
C. E. Lucas, E. A. Walters, J. Jatskevich, O. Wasynczuk, PC Krause and Associates, Inc; E. Zivi, U.S. Naval Academy In this paper, a new technique useful for the numerical simulation of large-scale systems is presented. This approach enables the overall system simulation to be formed by the dynamic interconnection of the various interdependent simulations, each representing a specific component or subsystem such as control, electrical, mechanical, hydraulic, or thermal. Each simulation may be developed separately using possibly different commercial-off-the-shelf simulation programs thereby allowing the most suitable language or tool to be used based on the design/analysis needs. For the purpose of demonstration, this technique is applied to a detailed simulation of a representative naval aircraft power system, such as that found on the Joint Strike Fighter (JSF). This system is comprised of ten component models each developed using MATLAB/SimulinkTM, EASY5TM, or ACSLTM. When the ten component simulations were distributed across just four personal computers (PCs), a greater than 15-fold improvement in simulation speed (compared to the single-computer implementation) was achieved. 13th Ship Control Systems Symposium, April 7-9, 2003, Orlando,...
Read MoreDistributed Heterogeneous Simulation of Naval Integrated Power Systems
E. A. Walters, C. E. Lucas, J. Jatskevich, O. Wasynczuk, PC Krause and Associates, Inc; P. T. Lamm, U.S. Air Force Research Laboratory; T. Neeves, Naval Surface Warfare Center ABSTRACT (Oleg has slide presentation.) American Society of Naval Engineers Symposium Harnessing the Power of Technology for the Warfighter, September 17, 2003, Bloomington, IN.
Read MoreDistributed Heterogeneous Simulation of Naval Integrated Power System
C. E. Lucas, E. A. Walters, J. Jatskevich , PC Krause and Associates, Inc; O. Wasynczuk, Purdue University; P. T. Lamm, U.S. Air Force Research Laboratory; T. E. Neeves, Naval Surface Warfare Center In this paper, a powerful technique of simulating large-scale dynamical systems is applied to a naval integrated power system. This approach enables the overall system simulation to be formed as the dynamic interconnection of interdependent simulations, each representing a specific electrical, mechanical, hydraulic, and/or thermal component/subsystem. Each simulation may be developed independently using possibly different commercial-off-the-shelf simulation programs thereby allowing the most suitable language or tool to be used based on the design/analysis needs. The simulation paradigm provides a structure that offers a convenient means of implementing simulations utilizing single-, multi-, or parallel-rates integration approaches as well as any combination thereof. Specifically, each component can be simulated using a time-step and integration algorithm that is best suited for that subsystem. The integrated power system is an advanced naval electric power system that includes a zonal dc electric distribution system and an integrated electric generation and propulsion system. The composite system simulation is implemented on a three-computer network of personal computers by interconnecting simulations of the constituent subsystems. In addition to the aforementioned advantages, it is shown that significant improvements in computational speed are achieved using this approach. Proceedings American Society of Naval Engineers Electric Machine Technology Symposium, January 27- 29, 2004, Philadelphia,...
Read More