The impedance-based stability analysis method has been widely used to assess the stability of interconnected systems in more electric transportations. This paper deals with the source/load impedance analysis of the droop-controlled multiple-source multiple-load system, which is a promising candidate in the future more-electric aircraft. This paper develops a mathematical model of a permanent magnet synchronous generator-active front-end generation system, derives the output impedance of the source subsystem including converter dynamics, and shows the effect of parameter variations on the source and load impedance. A dynamic droop controller is proposed to provide active damping to the system. In addition, the impedance analysis is extended to a generalized single bus-based multiple-source multiple-load system in which power losses are also investigated. Finally, the analytical results obtained in this paper are confirmed by the experimental results.
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Gao et al. (2016) studied this question.
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