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Several concurrent trends are forcing a reevaluation of the electrical power quality which is most practically and suitably delivered to aircraft electrical utilization equipment. Military applications have focused on 270 Vdc and the system integration issues of more-electric aircraft. Most civil applications are yet to become very much “more-electric”, though their increasing capacity and electronic load content has invalidated many of the assumptions upon which traditional power quality documents were based. This paper discusses the development of new guidelines for a variety of interface parameters essential to safe, effective application of both constant and variable frequency ac electric power.

A highly reliable alternative source for aircraft +28Vdc power is presented. This alternative uses a permanent magnet generator (PMG) and an electronic converter/regulator (C/R). The power system includes such features as independence from the main power system, high power quality with terminal or remote point of regulation (POR), light weight, and constant power availability from engine idle to maximum rpm. Included is a brief system description, a review of steady state and transient performance, and a conclusion with a perspective on future expectations.