Scaled-Down Strategy Analysis of Typical Components in Aircraft Power Supply Systems

Due to the constraints of manufacturing costs and cycles, it is difficult to simulate the full-scale operating conditions of aircraft electrical power systems. Usually, scaled-down low-power systems are used for prototype development and experimental research. This paper puts forward a systematic framework for developing scaled physical models of aircraft electrical power systems by using similarity theory. In this paper, according to the general design principles of DC-DC converters, a 10-kW low-power DC-DC converter and a 250-kW high-power DC-DC converter are designed. Mathematical models for both systems are developed, and a time-domain performance index analysis is carried out using the per-unit dynamic equivalence principle. A metric conversion model is established and equivalently mapped to a high-power DC-DC converter simulation model. The waveform consistency between the converted model and the aforementioned 250-kW high-power model is verified, which shows the validity of the proposed conversion method.