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Description of a 20 Kilohertz power distribution systemA single phase, 440 VRMS, 20 kHz power distribution system with a regulated sinusoidal wave form is discussed. A single phase power system minimizes the wiring, sensing, and control complexities required in a multi-sourced redundantly distributed power system. The single phase addresses only the distribution link; mulitphase lower frequency inputs and outputs accommodation techniques are described. While the 440 V operating potential was initially selected for aircraft operating below 50,000 ft, this potential also appears suitable for space power systems. This voltage choice recognizes a reasonable upper limit for semiconductor ratings, yet will direct synthesis of 220 V, 3 power. A 20 kHz operating frequency was selected to be above the range of audibility, minimize the weight of reactive components, yet allow the construction of single power stages of 25 to 30 kW. The regulated sinusoidal distribution system has several advantages. With a regulated voltage, most ac/dc conversions involve rather simple transformer rectifier applications. A sinusoidal distribution system, when used in conjunction with zero crossing switching, represents a minimal source of EMI. The present state of 20 kHz power technology includes computer controls of voltage and/or frequency, low inductance cable, current limiting circuit protection, bi-directional power flow, and motor/generator operating using standard induction machines. A status update and description of each of these items and their significance is presented.
Document ID
19860022112
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Hansen, I. G. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
August 1, 1986
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NAS 1.15:87346
NASA-TM-87346
Meeting Information
Meeting: Intersociety Energy Conversion Engineering Conference
Location: San Diego, CA
Country: United States
Start Date: August 25, 1986
End Date: August 29, 1986
Sponsors: SAE, AIChE, ACS, IEEE, ANS, AIAA, ASME
Accession Number
86N31584
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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