Type of Awards: SBIR Phase I and Phase II
Contract Numbers: NAS8-38035 and NAS3-25962
Agencies: Phase I: NASA MSFC and Phase II: NASA LeRC
Status: Completed
Periods: 12/29/88 to 5/29/89 and 8/31/90 to 8/30/92
Principal Investigators: Phase I: 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 basis.