Date of Award


Degree Type



Electrical and Computer Engineering

First Advisor

Stankovic, Ana

Subject Headings

Induction generators, Electric motors, Induction, Wind turbines -- Control, Wind power -- Stability, Harmonic functions, DFIG unbalanced wind turbine pulsating power elimination harmonic elimination


This thesis illustrates the principle and the behavior for doubly fed electric machines used in variable speed wind power systems under the balanced and unbalanced operating conditions. A generalized control method for complete stator pulsating power elimination and harmonic elimination in grid currents with adjustable power factor of a doubly fed induction generator under the unbalanced operating conditions is proposed. The theoretical analysis of this proposed control method is presented and then demonstrated by the simulation in Powersim®. The grid ride-through-fault ability by using the proposed method is also tested