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270-Vdc/Hybrid 115-Vac Electric Power Generating System Technology Demonstrator
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Abstract
Sundstrand is investigating 270-Vdc/hybrid 115-Vac electrical power generating and distribution systems technology so as to be well prepared to offer such systems for future aircraft applications. The approach taken has been to design, build, and test a representative system that meets or exceeds the tightest of the performance standards as defined by miliary standards.
This paper describes a single-channel, 120-kW hybrid system and presents some typical performance data. The dc bus supplies a 30-kVA, 400-Hz, 115-Vac inverter; constant power load banks of up to 150 kW; and a resistive load bank of up to 90 kW.
System simulation studies indicated the potential for unstable operation due to the negative impedance of the constant power load in conjunction with the source ripple filter and the load EMI filters. Unstable voltage and current were observed in system testing when the magnitude of the source impedance was not sufficiently below that of the load impedance. Plans for installing a second channel along with an electromechanical actuator and a large vapor-cycle cooling system as active loads are also discussed.
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Niggemann, R., Peecher, S., and Rozman, G., "270-Vdc/Hybrid 115-Vac Electric Power Generating System Technology Demonstrator," SAE Technical Paper 912051, 1991, https://doi.org/10.4271/912051.Also In
References
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- Middlebrook, R. D. “Design Techniques for Preventing Input-Filter Oscillations in Switched-Mode Regulators,” Proceedings of Powercon 5, The Fifth National SolidState Power Conversion Conference May 4-6 1978 San Francisco, CA Advances in Switched-Mode Power Conversion 1 Teslaco Pasadena, CA
- Schultz, S. Liu, J. Cho, B. Lee, F. C. “Integrating a Series of High-Density Converters,” Powertechnics Magazine January 1990
- Venable, H. Dean “Minimizing Input Filter Requirements in Military Power Supply Design,” Powerconversion & Intelligent Motion Magazine May 1987