Modeling and power flow analysis of cascaded doubly-fed induction machines

In this paper, a modeling approach for a brushless doubly-fed induction machine is proposed using an equivalent system of cascaded doubly-fed induction machines. A Steady-state and a transient model are developed and the results show a good agreement to measurements conducted on a set of two 1.5 kW doubly-fed induction machines. One main aspect of this work is the examination of the electrical and mechanical power flow of the combined machines with regard to the required inverter size.