A topology for multiple generation system with doubly fed induction machines and indirect matrix converter.

In this paper, a new topology for a grid connected generation system based on two double fed induction generators is presented The scheme uses an indirect matrix converter consisting on an input rectifier, a three-to-two matrix converter which provides a DC voltage, and two voltage fed output converters. The input converter is connected to the grid and each of the output converters is connected to the rotor of the corresponding machine. The rotor currents of each generator are vector controlled and unity power factor operation at the indirect matrix converter input is considered. The duty cycles for the input converter are chosen in order to obtain maximum DC link voltage. The duty cycles for each of the output converter can be arranged in order to minimize the commutation losses of the input converter and/or reduce the ripple of the input current. The speed of the generators is used to decide the switching pattern for the output converters. The entire system is modelled and results are presented to show the feasibility of the proposed scheme.