Modeling and Impedance Analysis of a Turbine- Generator-Rectifier System with Electromechanical Dynamic Interactions in More Electric Aircraft

Abstract

More electric aircraft concept has been a trend in the aircraft industry to tackle the challenge of reducing cost and weight, reducing environmental emissions, and increasing fuel efficiency. This increase in onboard electric power installation has brought challenges in the design and operation of aircraft electrical power systems. Onboard electric power is generated by turbine-driven generators and transferred to multiple loads through a dc distribution system. To ensure the electrical system’s normal operation during the whole flying profile, it is important to understand whether harmonics are passed through electromechanical coupling, since the electrical system is tightly coupled with the mechanical system through the generators. By examining generator output impedance, this paper found that the impact of the shaft dynamics on the electrical power system stability is mitigated by the generator rectifier.