E. Walters, PC Krause and Associates, Inc; S. Pekarek, O. Wasynczuk, Purdue University; A. Koenig, J. Wells, B. P. Loop, PC Krause and Associates, Inc; P. Lamm, U. S. Air Force Research Laboratory Historically, the design of aircraft electrical systems has been divided into separate mechanical (turbine engine) and electrical subsystems, wherein the coupled dynamics have been ignored until hardware integration. However, future loads such as Directed Energy Weapons (DEW), a coupled multi-physics design and analysis capability is required to evaluate system feasibility and establish optimal components in the context of a system-level architecture. In this paper, modeling and simulation techniques that provide a backbone for such design and analysis is set forth. Simulation techniques include a distributed heterogeneous simulation toolbox for interconnecting dynamic component models created using different simulation packages and/or operating systems. Modeling tools include a partitioned finite element technique and a field reconstruction technique that dramatically reduces the computational effort required to perform fields-based simulation of electric machines. Herein, the multi-physics tools are demonstrated for a multi-MW DEW system. The impact of the DEW load on the electrical, mechanical, and energy storage are evaluated under both transient and steady-state conditions and an attempt is made to search for architectures/ designs that minimize weight subject to maintaining stable system performance. 9th Annual Directed Energy Symposium, October 30-November 2, 2006, Albuquerque, NM. Contact Information:...
Read MoreOleg Wasynczuk
[gravatar email=”wasynczuk@pcka.com” class=”alignleft” size=”96″ default=”https://pcka.com/wp-content/uploads/2010/08/gravatar.jpg”]O. Wasynczuk received BSEE from Bradley University in 1976 and a MSEE and PhD from Purdue University in 1977 and 1979, respectively. He is a Professor in the School of Electrical and Computer Engineering at Purdue University and he is the Chief Technical Officer (CTO) and Research Fellow for PCKA. He is a principle co-inventor of the ASMG and DHS. His areas of interest are power system dynamics, control, finite element analysis and design of electromechanical devices. He has authored or co-authored over 50 high – level journal papers and has co-authored three books entitled “Analysis of Electric Machinery”, “Analysis of Electric Machinery and Drive Systems”, and “Electromechanical Motion Devices.” He is a Fellow of IEEE. Selected Publications D. Aliprantis, O. Wasynczuk, “A Voltage-Behind-Reactance Synchronous Machine Model with Saturation and Arbitrary Rotor Network Representation,” IEEE Transactions on Energy Conversion, vol. 23, no. 2, June 2008, pp. 499-508. N. Wu, O. Wasynczuk, “An Automated Average-Value Modeling Methodology for Power Electronic Sources and Loads,” SAE Transactions Journal of Aerospace, month 2007, pp. 846-855. W. Zhu, S. Pekarek, J. Jatskevich, O. Wasynczuk, D. Delisle, “A Model-in-the-Loop Interface to Represent Source Dynamics in a Hardware Based DC Distribution Testbed,” IEEE Transactions on Power Electronics, vol. 20, no. 2, March 2005, pp. 438-445. C. E. Lucas, E. A. Walters, O. Wasynczuk, P. T. Lamm, “An Algorithm for the Optimal Allocation of Subsystem Simulations within a Distributed Heterogeneous Simulation,” SAE Transactions Journal of Aerospace, Paper #2004-01-3183, month year, pp. 1871-1878. M. Belkhayat, O. Wasynczuk, “Stability Analysis of AC Power Systems with Regulated Electronic Loads,” SAE Transactions Journal of Aerospace, month 1998, pp. xxxx. O. Wasynczuk, S. D. Sudhoff, P. C. Krause, “Maximum Torque Per Ampere Induction Motor Drives – An Alternative to Field-Oriented Control,” SAE Transactions Journal of Aerospace, month 1998, pp. xxx. SAE Aerospace Power Systems Conference Best Paper Award. S. D. Pekarek, E. A. Walters, T. L. Skvarenina, O. Wasynczuk, “An Automated State Model Generation Algorithm for Simulation/Analysis of Power Systems with Power Electronic Components,” SAE Transactions Journal of Aerospace, month 1998, pp. xxx. S. D. Pekarek, O. Wasynczuk, “An Efficient and Accurate Voltage Behind-Reactance Model of Synchronous Machines for Simulation and Analysis of Machine-Converter Systems,” IEEE Transactions on Energy Conversion, vol. 13, no. 4, March 1998, pp. 42-48. O. Wasynczuk, S. D. Sudhoff, “Automated State Model Generation Algorithm for Power Circuits and Systems,” IEEE Transactions on Power Systems, vol. 11, no. 9, November 1996, pp. 1951-1956. O. Wasynczuk, S. D. Sudhoff, T. D. Tran, D. H. Clayton, H. J. Hegner, “A Voltage Control Strategy for Current-Regulated PWM Inverters,” IEEE Transactions on Power Electronics, vol. 11, no. 1, January 1996, pp....
Read MoreAutomated Evolutionary Design of a Hybrid-Electric Vehicle Power System Using Distributed Heterogeneous Optimization
Dionysios C. Aliprantis, O. Wasynczuk, Purdue University; N. Wu and C. E. Lucas, PC Krause and Associates, Inc; M. Abul Masrur, U.S. Army RDECOM-TARDEC The optimal design of hybrid-electric vehicle power systems poses a challenge to the system analyst, who is presented with a host of parameters to fine-tune, along with stringent performance criteria and multiple design objectives to meet. Herein, a methodology is presented to transform such a design task into a constrained multi-objective optimization problem, which is solved using a distributed evolutionary algorithm. A power system model representative of a series hybrid-electric vehicle is considered as a paradigm to support the illustration of the proposed methodology, with particular emphasis on the power system’s time-domain performance. 2006 SAE Power Systems Conference, November 7–9, 2006, New Orleans, LA. Paper #...
Read MoreAn Observer-Based Automated Averaging Technique for Power Electronic Circuits
E. A. Walters, O. Wasynczuk, J. V. Jatskevich, C. E. Lucas, PC Krause and Associates, Inc. Average-value models are commonly used in the design and analysis of power electronic-based systems as a method of portraying the overall system dynamics while neglecting discontinuities that arise from switching. Although numerous averaging methodologies have been developed to eliminate discontinuities, they are typically limited to specific circuits operating in specific modes. Therefore, substantial analytical effort is generally required to select an appropriate averaging technique and develop the corresponding average-value model that is valid for a given converter. To reduce this effort, an automated averaging technique is set forth in which an averaged model is established via coupling with a detailed simulation of the system. The structure of the averaged model is based upon state-space averaging with the detailed simulation used to calculate state models for each switching topology, the time spent per cycle in each topology, and the operating mode (continuous or discontinuous) of the circuit. However, since classical state-space averaging is not applicable to circuits with state-dependent switching logic and does not portray high- frequency dynamics associated with discontinuous states, a state feedback loop is introduced such that the high-frequency dynamics associated with state- dependent switching or discontinuous modes are accurately portrayed. To demonstrate the new technique, to example systems are examined, a PWM-controlled buck converter operating in both continuous and discontinuous modes and buck converter with a hysteresis current controller. The new averaging technique is verified by comparison with established analytical and numerical methods. SAE Transactions Journal of Aerospace, sec. 1, set 3, Month 2000, pp....
Read MoreAn Automated Average-Value Modeling Methodology for Power Electronic Sources and Loads
N. Wu, O. Wasynczuk, Purdue University and PC Krause and Associates; Peter T. Lamm, U.S. Air Force Research Laboratory In this paper, an automated averaging modeling methodology is set forth applicable to power electronic converters of arbitrary complexity. The user-defined inputs consist of a circuit description similar to the SPICE netlist (network graph and branch parameters), whereupon the input/output impedance-versus-frequency characteristics are automatically and rapidly generated. In addition to eliminating the need for the analytical derivation of average-value models, this methodology readily permits the inclusion of secondary effects such as conduction losses, switching losses, and magnetic nonlinearities, to name a few. This methodology has been successfully applied to characterize the impedance of a one-quadrant dc/dc buck converter, a three-phase diode rectifier source with three different modes of operation, and a space-vector-modulated dc/ac inverter. SAE Transactions Journal of Aerospace, 2007, pp. 846-855 and 2006 SAE Power Systems Conference, November 7–9, 2006, New Orleans, LA. Paper...
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