Abstract
AbstractA novel configuration is studied where a doubly fed induction generator provides power to a squirrel‐cage induction motor, and the speed of the motor is controlled through the rotor‐side converter of the generator. Such topology could have applications in hybrid‐electric propulsion and would require fewer and smaller power electronic converters than a system with an intermediate DC bus. An integrated motor/generator set model is developed to reflect the tightly connected dynamics of the combined electric machine. To simplify the derivations, a representation in complex variables is used. However, the control algorithm is based on proven field‐oriented control principles for induction motors. Feedforward and feedback control algorithms of the induction motor integrated with the doubly fed induction generator are proposed, together with two methods to limit the rotor currents of the generator. Experimental data show excellent tracking performance of speed references, demonstrating the validity of the control methods proposed. Concepts are also presented for the management of a small energy storage component.
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