Type of Awards: SBIR Phase I and Phase II, Contract Numbers: N00017-88-C-0031and N61533-89-C-0062 Agencies: U.S. Navy David Taylor Research Center and U.S. Naval Sea Command Status: Completed Periods: 1/14/88 to 7/14/88 and 6/30/89 to 9/30/91 Phase III: Dynamic Simulation of High-Power Machinery Systems; N00167-99-D-0100 Principal Investigator: Paul Krause Abstract: A detailed computer representation of the shipboard electric power distribution system was developed and verified in Phase I. This set the stage for developing reduced order models for the components of the shipboard electric power system and to use the detailed computer models as a means of verifying the reduced order models individually and in a system configuration. Development of reduced order models and the equations necessary to connect these models in any feasible system configuration is the first objective of the proposed research. The second is to begin defining transient and dynamic stability and system security for a finite inertia electric system for normal and emergency operating conditions. Achieving these goals is necessary in order to provide a means to design and investigate the performance of proposed shipboard electric power...
Read MorePhase I: Control of Resonance in a 20-Khz Space Power System and Investigation of Advanced Power Sources (MSFC) and Phase II: Investigation of Advanced Power Sources and Actuator Systems for Future Aerospace Vehicles (LeRC)
Type of Awards: SBIR Phase I and Phase II Contract Numbers: NAS8-38035 and NAS3-25962 Agencies: Phase I: NASA MSFC and Phase II:Ā NASA LeRC Status: Completed Periods: 12/29/88 to 5/29/89 and 8/31/90 to 8/30/92 Principal Investigators: Phase I:Ā Paul Krause; Phase II: Scott Sudhoff Phase III: Power Systems Modeling for Power-By-Wire Applications; NAS3-27203 Abstract: In Phase I, detailed computer simulations of two candidate 20-kHz spacecraft power systems (TRW and GD) were implemented on a Hybrid Computer/Power Systems Simulator and verified by comparison with experimental results. In the absence of filtering, both systems exhibit harmonic resonances due to an interaction between the switching of the source converter and the ac system. Methods of suppressing harmonic resonance and improving the waveform quality were demonstrated in both power systems studied. The primary objective of the proposed Phase II research is to investigate power system configurations for use in future aerospace vehicles including spacecraft and the all-electric airplane. The power systems will be investigated on an end-to-end basis including the source(s), transmission/distribution system, load converters, and electromechanical actuators. The computer models that are to be developed in Phase II will provide a convenient means of comparing competing power system configurations from the standpoint of stability, regulation, harmonic distortion, and system interactions, all on an end-to-end system...
Read MoreDynamic Simulation of High-Power Machinery Systems
Type of Awards: SBIR Phase I and Phase II Contract Numbers: N61533-95-C-0107 and N00024-97-C-4097 Agency: U.S. Naval Surface Warfare Center and U.S. Naval Sea Command Status: Completed Periods: 8/23/95 to 6/30/96 and 3/13/97 to 5/1/99 Principal Investigators: Paul Krause and Steve Pekarek Phase III: Dynamic Simulation of High-Power Machinery Systems; N00167-99-D-0100, Subcontracted: Purdue andĀ PCKA Abstract: Over the past 7-8 years, PCKA has been heavily involved in the analysis and simulation of power/drive systems. This work has been done through SBIRās and level-of-effort contracts for the Navy, Air Force, NASA, and, to a lesser extent, the Army. Considerable focus has been on developing models and modeling techniques. A major breakthrough by PCKA/Purdue, which has the potential of revolutionizing power/drive system analysis and simulation, has been the automatic state matrix generator as a āfront endā to a differential-equation-based simulation language (ACSL). This state model generator (SMG) offers the potential of (1) a circuit-based input to a equation-based language (2) convenient and economical simulations, (3) automatic state-space averaging, (4) semi-automatic nonlinear reduced-order modeling, (5) automatic modal reduction, and (6) automatic model connection. Although all these features are promising concepts, none have been developed to the extent necessary for convenient utilization. The focus of the proposed work is to continue research toward the development of these techniques in ACSL and to make the SMG and the associate techniques compatible with MATLAB. The overall objective is to develop a user-interactive system modeler which will lead the system analyst through the steps to implement a system model making use of the potential offered by the SMG. Focus will be on the Navy IPS; however, this work will be valid for the power/drive systems being used or considered by other agencies. Moreover, this work not only represents a breakthrough in simulation, it also automatically provides the mathematical structure to analyze and develop linear and nonlinear controls for power/drive systems. Although the control aspects are not topics of the proposed work, the guidelines for the mathematical structure appropriate for analysis and design of nonlinear system controls will naturally...
Read MoreParameter Measurement of a Six-Phase Synchronous Machine for Simulation of Machine/Converter Systems
H. J. Hegner, Naval Surface Warfare Center; Ā P. C. Krause, O. Wasynczuk, E. A. Walters, S. D. Pekarek, PC Krause and Associates, Inc. Proceedings 31st Intersociety Energy Conversion Engineering Conference, vol. 3, July 1996. pp. 1792-1797.
Read MoreAnalysis and Simulation of a Six-Phase Generator/Rectifier System
W. L. Tucker, Naval Surface Warfare Center; P. C. Krause, O. Wasynczuk, S. D. Pekarek, E. A. Walters, PC Krause and Associates, Inc. Proceedings 31st Intersociety Energy ConverĀsion Engineering Conference, vol. 3, July 1996, pp. 1804-1808.
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