Aircraft power and propulsion system design is evolving towards more electric technology for the purpose of improving overall efficiency. This poses new challenges for modelling, simulation, optimal design of systems containing mechanical and electrical components, including many switching power electronic converters. The generalized gyrator theory and time-domain transfer function theory provide new tools for studying the dynamics and stability of such electromechanical systems. This paper presents these concepts to help with the analysis, design andcontrol of the more electric aircraft. Using the generalized gyrator theory, the mechanical components can be transferred to the electrical side of the system and represented by their electrical models. The time-domain transfer function theory of power electronics provides a method to model switching power electronics converters as a generalized transformer. This allocs for the referral of circuit elements from one side of the switching converter to the other. As a result, the complex aircraft electromechanical system can be reduced to an electrical circuit simplified model. This will assist in the detailed analysis, design and control of the system, prior to physical prototyping (iron-bird). In addition, the overall system circuit model will provide a better insight into the operation and interactions between the components of the system. Basic theory, example case studies, and future applications and benefits to the more electric aircraft will be presentedand discussed.
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