C. E. Lucas, E. A. Walters, J. Jatskevich, O. Wasynczuk, PC Krause and Associates, Inc; P. T. Lamm, U.S. Air Force Research Laboratory 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. These subsystems communicate the required interface variables at specific time intervals. A discussion concerning the selection of appropriate communication intervals is presented herein. For the purpose of demonstration, this technique is applied to a detailed simulation of a representative 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. SPIE 17th Annual International Symposium AeroSense, April 22-25, 2003, Orlando, FL. and SPIE Proceedings Enabling Technologies for Simulation Science VII, vol. 5091, September 4, 2003, pp....
Read MoreAutomated State Model Generator for Simulation and Analysis of Power Electronic Systems
J. Jatskevich, University of British Columbia; O. Wasynczuk, Purdue University; C. E. Lucas, E. A. Walters, PC Krause and Associates, Inc. An algorithmic method of developing the state equations of complex power circuits and systems has recently been developed. In this approach, referred to as he Automated State Model Generator (ASMG), the system is described by the pertinent branch parameters and the circuit topology; however, unlike existing circuit-based approaches, the difference equations are not implemented at the branch level. Instead, the composite system state equations are established automatically and updated dynamically for each new topology of the switching network. Since the state equations are available, linearization, eigensystem analysis, and model-order reduction can be performed quickly and conveniently at the system level. In addition, it becomes possible to identify the operational modes of converters and inverters based on the cyclically repeated sequence of topologies. The ASMG includes a built-in switching logic for common power-electronic switching devices. The proposed simulation approach is particularly effective when modeling advanced power electronic systems that include special-purpose multi-phase electrical machines, transformers, and other components that are not available in the libraries of commonly used circuit simulators. An ASMG toolbox that is compatible with MATLAB/SIMULINK has been developed and used to implement a detailed simulation of a 6-phase generator/rectifier system. Proceedings 6th International Conference of Computational Methods for the Solution of Electrical and Electromagnetic Engineering Problems, September 10-12, 2003, Split, Croatia, WIT Press, pp....
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 MoreAn Efficient Multi-Rate Simulation Technique for Power Electronic-Based Systems
S. D. Pekarek, O. Wasynczuk, Purdue University; E. A. Walters, J. V. Jatskevich, C. E. Lucas, N. Wu, PC Krause and Associate, Inc; P. T. Lamm, U.S. Air Force Research Laboratory A novel multi-rate method of simulating power-electronic-based systems containing a wide range of time scales is presented. In this method, any suitable integration algorithm, with fixed or variable time-step, can be applied to the fast and/or slow subsystems. The subsystems exchange coupling variables at a communication interval that can be fixed or varied dynamically depending upon the state of the system variables. The proposed multi-rate method is applied to two example power systems that include power-electronic subsystems. Increases in simulation speed of 183-281% over established single-rate integration algorithms are demonstrated. IEEE Transactions on Power Systems, vol. 19, no. 1, February 2004, pp....
Read MoreDistributed Heterogeneous Simulation, a New Paradigm for Simulating Integrated Naval Power Systems
C. E. Lucas, E. A. Walters, J. Jatskevich, O. Wasynczuk, PC Krause and Associates, Inc; P. T. Lamm U.S. Air Force Research Laboratory; T. E. Neeves, Naval Surface Warfare Center A new paradigm for simulating large-scale dynamical systems is described and applied to an integrated naval power system. This approach enables the overall system simulation to be formed as an interconnection of interdependent dynamic 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 proposed simulation paradigm is applied to 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. It is shown that significant improvements in computational speed are achieved using this approach. WSEAS/IASME Transactions, issue 3, vol. 1, July 2004, pp....
Read More