Steady State Analysis of Twin Stator Cascaded Doubly Fed Induction Generator

Abstract

In the near future brushless induction machines could become the real alternative for the brush-geared doubly fed induction generators in windmills applications. Cascaded doubly fed induction generator (CDFIG) examined in the paper consists of two identical wound rotor induction machines having their rotors mechanically and eletrically coupled. In CDFIG both stators of connected machines are accessible. While stator of the first machine is directly connected to the grid, the stator currents and voltages of the second machine can be manipulated for power generation requirements. The paper presents an equivalent circuit of CDFIG at steady state as well the mathematical model of the twin stator cascaded machine. The PSIM simulation software is used for a preliminary investigations of CDFIG.