Comparison between a 2.5 MW DFIG and CDFIG in wind energy conversion systems

A 2.5MW doubly-fed induction generator (DFIG) and a cascade doubly-fed induction generator (CDFIG) in energy conversion system are compared in order to investigate the cost and efficiency of the system. A reference doubly-fed induction generator and a scaling methodology are employed to design the cascade doubly-fed induction generator Using finite element analysis (FEA) and MATLAB/Simulink, both doubly-fed induction generator and cascade doubly-fed induction generator are modeled under similar wind profiles. The total active and reactive output power for both generators are presented. The efficiency of the cascade doubly-fed induction generator is better than the doubly-fed induction generator, however, this is only notable in large scale wind energy generation.