Doubly fed induction machine control for wind energy conversion
Massey, Jason G.
Julian, Alexander L.
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Due to increasing concerns about CO2 emissions and the shortage of fossil fuels, renewable energy has become a major topic in economic discussions. One renewable source is energy that can be extracted from the wind. This thesis covers the basics of using a doubly-fed induction generator (DFIG) to convert the mechanical energy of the wind into useful electrical power that can be used to supply electricity to any grid. Implementation and simulation results are analyzed in this research. The design implements digital four quadrant control of a DFIG with a direct current (DC) machine serving as the prime mover. Digital control of voltage, current and frequency in the rotor windings is accomplished using a Voltage Source Inverter (VSI), while the stator voltage and frequency is maintained by the grid. Simulation is accomplished using Matlab and Simulink software. The simulations are verified with lab hardware.