Interface Problems in the Use of Aerospace Static Power Conversion Equipment

This paper is concerned with static inverters and dc link frequency converters. Its purpose is to describe some of the problem areas which should be considered in equipment design, equipment specification, and system design, with the goal of achieving optimum power system design. Five major areas are covered, as follows: (1) Input Overvoltage Transients Causes of transients and their effects on equipment design are discussed, and some means of reducing their effect are shown. Comments are made relative to methods of describing overvoltage transients for semiconductor circuits. (2) Overload and Short Circuit Capability The effect of overload requirements on design is shown, and typical data is given showing some of the trade-off involved. (3) Output Harmonic Requirements The source of harmonics is shown. Means of reduction by filtering and by harmonic cancellation is discussed and trade-off data is presented. (4) DC Source Requirements The need for a bilateral source of low ac impedance is shown. (5) AC Source Problems Rectifier distortion of the source is discussed, and the trade-offs involved in its reduction are shown.