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IDENTIFICATION AND MITIGATION OF ELECTRO-MECHANICAL INTERACTIONS IN MORE-ELECTRIC AIRCRAFT SYSTEMS

Erazo Damian, Inaki

[Thesis]. Manchester, UK: The University of Manchester; 2016.

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Abstract

This work is focused on identifying the resonant modes in a mechanical drivetrain and preventing their excitation. The studies are based on an experimental platform that represents the behaviour of a real gas turbine auxiliary power system for a more-electric aircraft.A control technique is applied to regulate both stator voltage magnitude and frequency on a Doubly Fed Induction Generator (DFIG) that is analysed as an electromechanical system; in addition, the methodology and several tools for implementation are discussed. The test and validation of this controller to mitigate electromechanical interactions is developed in this work, verified by simulation and implemented in the experimental test rig.A detailed mechanical model is also described in this work and simulated in combination with the electrical system in SIMULINK, where torque measurements in the system are helpful to analyse the frequency component of the electromechanical platform for different conditions, in terms of the speed and load on the DFIG.A transfer function analysis is performed in the platform looking at the resonant modes that can be excited by electrical or mechanical sources. Both the mechanical and electrical system are analysed as a complete electro-mechanical system in order to predict the behaviour of this system under different load conditions.Results of simulation, transfer function analysis and the real system are compared and discussed concluding in a direct relationship between the excitation of the resonant modes and the electrical system.