S. D. Pekarek, O. Wasynczuk, T. Skvarenina, E. A. Walters, PC Krause and Associates, Inc. 33rd Intersociety Energy Conversion Engineering Conference Proceedings, August 1998.
Read MoreComputer Modeling of a High-Pulse-Count AC/DC Converter with Interconnected Multi-Legged Core Transformers
E. A. Walters, O. Wasynczuk, PC Krause and Associates, Inc; H. J. Hegner, Naval Surface Warfare Center Proceedings Naval Symposium on Electric Machines, October 1998, pp. 161-167.
Read MoreAn Automated State Model Generation Algorithm for Simulation/Analysis of Power Systems with Power Electronic Components
S. D. Pekarek, E. A. Walters, T. L. Skvarenina, O. Wasynczuk, PC Krause and Associates, Inc. In this paper, a recently developed algorithmic method of deriving the state equations of power systems containing power electronic components is described. Therein the system is described by the pertinent branch parameters and the circuit topology; however, unlike circuit-based algorithms, the difference equations are not implemented at the branch level. Instead, the composite system state equations are established. A demonstration of the computer implementation of this algorithm to model a variable-speed, constant-frequency aircraft generation system is described. Because of the large number of states and complexity of the system, particular attention is placed on the development of a model structure which provides optimal simulation efficiency. SAE Transactions Journal of Aerospace, sec. 1, vol. 107, Month 1998, pp....
Read MoreModeling of Switched Networks in Continuous State-Space
J. Jatskevich, O. Wasynczuk, E. A. Walters, C. E. Lucas, PC Krause and Associates, Inc. Proceedings IEEE Canadian Conference on Electrical and Computer Engineering, vol. 1, May xxxxx, 2000, pp. 559-563.
Read MoreContinuous State-Space Modeling of Switched Electric Networks
J. Jatskevich, O. Wasynczuk, E. A. Walters, C. E. Lucas, PC Krause and Associates, Inc. An Automated State Model Generator (ASMG) is a tool for modeling and analysis of lumped-parameter power-electronic-based systems. In this modeling approach, the minimal state-space representation of the overall system is generated automatically and updated dynamically based upon the topological state of the system. However, due to the changing topology, simulation of a switched circuit using the ASMG requires the concatenation of solutions to the initial value problems (IVPs) corresponding to the time intervals between commutations. In this paper, a transformation of state variables is derived such that the states are continuous throughout the simulation process. This feature eliminates the need to re-initialize the ODE solver. The continuous state algorithm is verified on a high-pulse-count power supply and sets the stage for state-space averaging and system-level analysis of switched circuits. Proceedings IEEE International Conference on Control Applications, vol. 1, September 2000, pp....
Read MoreMore-Electric Subsystem Control
S. D. Sudhoff, Purdue University; E. A. Walters, O. Wasynczuk, PC Krause and Associates, Inc; P. T. Lamm, U.S. Air Force Research Laboratory 2000 SAE Power Systems Conference, November 2000, San Diego, CA.
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