Abstract
The control of a cascaded doubly fed machine (CDFM) to be used for aircraft power generation is investigated. The controller employs a resistance simulator in the generator exciter to provide machine damping. Excitation is provided by a six step inverter fed from a controlled rectifier. Delays due to the dc link time constant cause the resistance simulation to be nonideal. An investigation into the ability of resistance simulation to provide damping under these conditions is described. The study includes linearized analysis, simulation, and laboratory tests. Good correlation between these methods was obtained throughout the study. Three control strategies for providing machine damping were investigated, and it is concluded that resistance simulation can be used to provide machine damping under these conditions.
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